1	/*
2	* Copyright © 1997-2003 by The XFree86 Project, Inc.
3	* Copyright © 2007 Dave Airlie
4	* Copyright © 2007-2008 Intel Corporation
5	* Jesse Barnes <jesse.barnes@intel.com>
6	* Copyright 2005-2006 Luc Verhaegen
7	* Copyright (c) 2001, Andy Ritger aritger@nvidia.com
8	*
9	* Permission is hereby granted, free of charge, to any person obtaining a
10	* copy of this software and associated documentation files (the "Software"),
11	* to deal in the Software without restriction, including without limitation
12	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
13	* and/or sell copies of the Software, and to permit persons to whom the
14	* Software is furnished to do so, subject to the following conditions:
15	*
16	* The above copyright notice and this permission notice shall be included in
17	* all copies or substantial portions of the Software.
18	*
19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25	* OTHER DEALINGS IN THE SOFTWARE.
26	*
27	* Except as contained in this notice, the name of the copyright holder(s)
28	* and author(s) shall not be used in advertising or otherwise to promote
29	* the sale, use or other dealings in this Software without prior written
30	* authorization from the copyright holder(s) and author(s).
31	*/
32
33	#include <linux/ctype.h>
34	#include <linux/export.h>
35	#include <linux/fb.h> /* for KHZ2PICOS() */
36	#include <linux/list.h>
37	#include <linux/list_sort.h>
38	#include <linux/of.h>
39
40	#include <video/of_display_timing.h>
41	#include <video/of_videomode.h>
42	#include <video/videomode.h>
43
44	#include <drm/drm_crtc.h>
45	#include <drm/drm_device.h>
46	#include <drm/drm_edid.h>
47	#include <drm/drm_modes.h>
48	#include <drm/drm_print.h>
49
50	#include "drm_crtc_internal.h"
51
52	/**
53	* drm_mode_debug_printmodeline - print a mode to dmesg
54	* @mode: mode to print
55	*
56	* Describe @mode using DRM_DEBUG.
57	*/
58	void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
59	{
60	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
61	}
62	EXPORT_SYMBOL(drm_mode_debug_printmodeline);
63
64	/**
65	* drm_mode_create - create a new display mode
66	* @dev: DRM device
67	*
68	* Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
69	* and return it.
70	*
71	* Returns:
72	* Pointer to new mode on success, NULL on error.
73	*/
74	struct drm_display_mode *drm_mode_create(struct drm_device *dev)
75	{
76	struct drm_display_mode *nmode;
77
78	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
79	if (!nmode)
80	return NULL;
81
82	return nmode;
83	}
84	EXPORT_SYMBOL(drm_mode_create);
85
86	/**
87	* drm_mode_destroy - remove a mode
88	* @dev: DRM device
89	* @mode: mode to remove
90	*
91	* Release @mode's unique ID, then free it @mode structure itself using kfree.
92	*/
93	void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
94	{
95	if (!mode)
96	return;
97
98	kfree(objp: mode);
99	}
100	EXPORT_SYMBOL(drm_mode_destroy);
101
102	/**
103	* drm_mode_probed_add - add a mode to a connector's probed_mode list
104	* @connector: connector the new mode
105	* @mode: mode data
106	*
107	* Add @mode to @connector's probed_mode list for later use. This list should
108	* then in a second step get filtered and all the modes actually supported by
109	* the hardware moved to the @connector's modes list.
110	*/
111	void drm_mode_probed_add(struct drm_connector *connector,
112	struct drm_display_mode *mode)
113	{
114	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
115
116	list_add_tail(new: &mode->head, head: &connector->probed_modes);
117	}
118	EXPORT_SYMBOL(drm_mode_probed_add);
119
120	enum drm_mode_analog {
121	DRM_MODE_ANALOG_NTSC, /* 525 lines, 60Hz */
122	DRM_MODE_ANALOG_PAL, /* 625 lines, 50Hz */
123	};
124
125	/*
126	* The timings come from:
127	* - https://web.archive.org/web/20220406232708/http://www.kolumbus.fi/pami1/video/pal_ntsc.html
128	* - https://web.archive.org/web/20220406124914/http://martin.hinner.info/vga/pal.html
129	* - https://web.archive.org/web/20220609202433/http://www.batsocks.co.uk/readme/video_timing.htm
130	*/
131	#define NTSC_LINE_DURATION_NS 63556U
132	#define NTSC_LINES_NUMBER 525
133
134	#define NTSC_HBLK_DURATION_TYP_NS 10900U
135	#define NTSC_HBLK_DURATION_MIN_NS (NTSC_HBLK_DURATION_TYP_NS - 200)
136	#define NTSC_HBLK_DURATION_MAX_NS (NTSC_HBLK_DURATION_TYP_NS + 200)
137
138	#define NTSC_HACT_DURATION_TYP_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_TYP_NS)
139	#define NTSC_HACT_DURATION_MIN_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MAX_NS)
140	#define NTSC_HACT_DURATION_MAX_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MIN_NS)
141
142	#define NTSC_HFP_DURATION_TYP_NS 1500
143	#define NTSC_HFP_DURATION_MIN_NS 1270
144	#define NTSC_HFP_DURATION_MAX_NS 2220
145
146	#define NTSC_HSLEN_DURATION_TYP_NS 4700
147	#define NTSC_HSLEN_DURATION_MIN_NS (NTSC_HSLEN_DURATION_TYP_NS - 100)
148	#define NTSC_HSLEN_DURATION_MAX_NS (NTSC_HSLEN_DURATION_TYP_NS + 100)
149
150	#define NTSC_HBP_DURATION_TYP_NS 4700
151
152	/*
153	* I couldn't find the actual tolerance for the back porch, so let's
154	* just reuse the sync length ones.
155	*/
156	#define NTSC_HBP_DURATION_MIN_NS (NTSC_HBP_DURATION_TYP_NS - 100)
157	#define NTSC_HBP_DURATION_MAX_NS (NTSC_HBP_DURATION_TYP_NS + 100)
158
159	#define PAL_LINE_DURATION_NS 64000U
160	#define PAL_LINES_NUMBER 625
161
162	#define PAL_HACT_DURATION_TYP_NS 51950U
163	#define PAL_HACT_DURATION_MIN_NS (PAL_HACT_DURATION_TYP_NS - 100)
164	#define PAL_HACT_DURATION_MAX_NS (PAL_HACT_DURATION_TYP_NS + 400)
165
166	#define PAL_HBLK_DURATION_TYP_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_TYP_NS)
167	#define PAL_HBLK_DURATION_MIN_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MAX_NS)
168	#define PAL_HBLK_DURATION_MAX_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MIN_NS)
169
170	#define PAL_HFP_DURATION_TYP_NS 1650
171	#define PAL_HFP_DURATION_MIN_NS (PAL_HFP_DURATION_TYP_NS - 100)
172	#define PAL_HFP_DURATION_MAX_NS (PAL_HFP_DURATION_TYP_NS + 400)
173
174	#define PAL_HSLEN_DURATION_TYP_NS 4700
175	#define PAL_HSLEN_DURATION_MIN_NS (PAL_HSLEN_DURATION_TYP_NS - 200)
176	#define PAL_HSLEN_DURATION_MAX_NS (PAL_HSLEN_DURATION_TYP_NS + 200)
177
178	#define PAL_HBP_DURATION_TYP_NS 5700
179	#define PAL_HBP_DURATION_MIN_NS (PAL_HBP_DURATION_TYP_NS - 200)
180	#define PAL_HBP_DURATION_MAX_NS (PAL_HBP_DURATION_TYP_NS + 200)
181
182	struct analog_param_field {
183	unsigned int even, odd;
184	};
185
186	#define PARAM_FIELD(_odd, _even) \
187	{ .even = _even, .odd = _odd }
188
189	struct analog_param_range {
190	unsigned int min, typ, max;
191	};
192
193	#define PARAM_RANGE(_min, _typ, _max) \
194	{ .min = _min, .typ = _typ, .max = _max }
195
196	struct analog_parameters {
197	unsigned int num_lines;
198	unsigned int line_duration_ns;
199
200	struct analog_param_range hact_ns;
201	struct analog_param_range hfp_ns;
202	struct analog_param_range hslen_ns;
203	struct analog_param_range hbp_ns;
204	struct analog_param_range hblk_ns;
205
206	unsigned int bt601_hfp;
207
208	struct analog_param_field vfp_lines;
209	struct analog_param_field vslen_lines;
210	struct analog_param_field vbp_lines;
211	};
212
213	#define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp, \
214	_hslen, _hbp, _hblk, _bt601_hfp, _vfp, \
215	_vslen, _vbp) \
216	[_mode] = { \
217	.num_lines = _lines, \
218	.line_duration_ns = _line_dur, \
219	.hact_ns = _hact, \
220	.hfp_ns = _hfp, \
221	.hslen_ns = _hslen, \
222	.hbp_ns = _hbp, \
223	.hblk_ns = _hblk, \
224	.bt601_hfp = _bt601_hfp, \
225	.vfp_lines = _vfp, \
226	.vslen_lines = _vslen, \
227	.vbp_lines = _vbp, \
228	}
229
230	static const struct analog_parameters tv_modes_parameters[] = {
231	TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC,
232	NTSC_LINES_NUMBER,
233	NTSC_LINE_DURATION_NS,
234	PARAM_RANGE(NTSC_HACT_DURATION_MIN_NS,
235	NTSC_HACT_DURATION_TYP_NS,
236	NTSC_HACT_DURATION_MAX_NS),
237	PARAM_RANGE(NTSC_HFP_DURATION_MIN_NS,
238	NTSC_HFP_DURATION_TYP_NS,
239	NTSC_HFP_DURATION_MAX_NS),
240	PARAM_RANGE(NTSC_HSLEN_DURATION_MIN_NS,
241	NTSC_HSLEN_DURATION_TYP_NS,
242	NTSC_HSLEN_DURATION_MAX_NS),
243	PARAM_RANGE(NTSC_HBP_DURATION_MIN_NS,
244	NTSC_HBP_DURATION_TYP_NS,
245	NTSC_HBP_DURATION_MAX_NS),
246	PARAM_RANGE(NTSC_HBLK_DURATION_MIN_NS,
247	NTSC_HBLK_DURATION_TYP_NS,
248	NTSC_HBLK_DURATION_MAX_NS),
249	16,
250	PARAM_FIELD(3, 3),
251	PARAM_FIELD(3, 3),
252	PARAM_FIELD(16, 17)),
253	TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL,
254	PAL_LINES_NUMBER,
255	PAL_LINE_DURATION_NS,
256	PARAM_RANGE(PAL_HACT_DURATION_MIN_NS,
257	PAL_HACT_DURATION_TYP_NS,
258	PAL_HACT_DURATION_MAX_NS),
259	PARAM_RANGE(PAL_HFP_DURATION_MIN_NS,
260	PAL_HFP_DURATION_TYP_NS,
261	PAL_HFP_DURATION_MAX_NS),
262	PARAM_RANGE(PAL_HSLEN_DURATION_MIN_NS,
263	PAL_HSLEN_DURATION_TYP_NS,
264	PAL_HSLEN_DURATION_MAX_NS),
265	PARAM_RANGE(PAL_HBP_DURATION_MIN_NS,
266	PAL_HBP_DURATION_TYP_NS,
267	PAL_HBP_DURATION_MAX_NS),
268	PARAM_RANGE(PAL_HBLK_DURATION_MIN_NS,
269	PAL_HBLK_DURATION_TYP_NS,
270	PAL_HBLK_DURATION_MAX_NS),
271	12,
272
273	/*
274	* The front porch is actually 6 short sync
275	* pulses for the even field, and 5 for the
276	* odd field. Each sync takes half a life so
277	* the odd field front porch is shorter by
278	* half a line.
279	*
280	* In progressive, we're supposed to use 6
281	* pulses, so we're fine there
282	*/
283	PARAM_FIELD(3, 2),
284
285	/*
286	* The vsync length is 5 long sync pulses,
287	* each field taking half a line. We're
288	* shorter for both fields by half a line.
289	*
290	* In progressive, we're supposed to use 5
291	* pulses, so we're off by half
292	* a line.
293	*
294	* In interlace, we're now off by half a line
295	* for the even field and one line for the odd
296	* field.
297	*/
298	PARAM_FIELD(3, 3),
299
300	/*
301	* The back porch starts with post-equalizing
302	* pulses, consisting in 5 short sync pulses
303	* for the even field, 4 for the odd field. In
304	* progressive, it's 5 short syncs.
305	*
306	* In progressive, we thus have 2.5 lines,
307	* plus the 0.5 line we were missing
308	* previously, so we should use 3 lines.
309	*
310	* In interlace, the even field is in the
311	* exact same case than progressive. For the
312	* odd field, we should be using 2 lines but
313	* we're one line short, so we'll make up for
314	* it here by using 3.
315	*
316	* The entire blanking area is supposed to
317	* take 25 lines, so we also need to account
318	* for the rest of the blanking area that
319	* can't be in either the front porch or sync
320	* period.
321	*/
322	PARAM_FIELD(19, 20)),
323	};
324
325	static int fill_analog_mode(struct drm_device *dev,
326	struct drm_display_mode *mode,
327	const struct analog_parameters *params,
328	unsigned long pixel_clock_hz,
329	unsigned int hactive,
330	unsigned int vactive,
331	bool interlace)
332	{
333	unsigned long pixel_duration_ns = NSEC_PER_SEC / pixel_clock_hz;
334	unsigned int htotal, vtotal;
335	unsigned int max_hact, hact_duration_ns;
336	unsigned int hblk, hblk_duration_ns;
337	unsigned int hfp, hfp_duration_ns;
338	unsigned int hslen, hslen_duration_ns;
339	unsigned int hbp, hbp_duration_ns;
340	unsigned int porches, porches_duration_ns;
341	unsigned int vfp, vfp_min;
342	unsigned int vbp, vbp_min;
343	unsigned int vslen;
344	bool bt601 = false;
345	int porches_rem;
346	u64 result;
347
348	drm_dbg_kms(dev,
349	"Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n",
350	hactive, vactive,
351	interlace ? 'i' : 'p',
352	params->num_lines,
353	pixel_clock_hz / 1000);
354
355	max_hact = params->hact_ns.max / pixel_duration_ns;
356	if (pixel_clock_hz == 13500000 && hactive > max_hact && hactive <= 720) {
357	drm_dbg_kms(dev, "Trying to generate a BT.601 mode. Disabling checks.\n");
358	bt601 = true;
359	}
360
361	/*
362	* Our pixel duration is going to be round down by the division,
363	* so rounding up is probably going to introduce even more
364	* deviation.
365	*/
366	result = (u64)params->line_duration_ns * pixel_clock_hz;
367	do_div(result, NSEC_PER_SEC);
368	htotal = result;
369
370	drm_dbg_kms(dev, "Total Horizontal Number of Pixels: %u\n", htotal);
371
372	hact_duration_ns = hactive * pixel_duration_ns;
373	if (!bt601 &&
374	(hact_duration_ns < params->hact_ns.min ||
375	hact_duration_ns > params->hact_ns.max)) {
376	drm_err(dev, "Invalid horizontal active area duration: %uns (min: %u, max %u)\n",
377	hact_duration_ns, params->hact_ns.min, params->hact_ns.max);
378	return -EINVAL;
379	}
380
381	hblk = htotal - hactive;
382	drm_dbg_kms(dev, "Horizontal Blanking Period: %u\n", hblk);
383
384	hblk_duration_ns = hblk * pixel_duration_ns;
385	if (!bt601 &&
386	(hblk_duration_ns < params->hblk_ns.min ||
387	hblk_duration_ns > params->hblk_ns.max)) {
388	drm_err(dev, "Invalid horizontal blanking duration: %uns (min: %u, max %u)\n",
389	hblk_duration_ns, params->hblk_ns.min, params->hblk_ns.max);
390	return -EINVAL;
391	}
392
393	hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns);
394	drm_dbg_kms(dev, "Horizontal Sync Period: %u\n", hslen);
395
396	hslen_duration_ns = hslen * pixel_duration_ns;
397	if (!bt601 &&
398	(hslen_duration_ns < params->hslen_ns.min ||
399	hslen_duration_ns > params->hslen_ns.max)) {
400	drm_err(dev, "Invalid horizontal sync duration: %uns (min: %u, max %u)\n",
401	hslen_duration_ns, params->hslen_ns.min, params->hslen_ns.max);
402	return -EINVAL;
403	}
404
405	porches = hblk - hslen;
406	drm_dbg_kms(dev, "Remaining horizontal pixels for both porches: %u\n", porches);
407
408	porches_duration_ns = porches * pixel_duration_ns;
409	if (!bt601 &&
410	(porches_duration_ns > (params->hfp_ns.max + params->hbp_ns.max) ||
411	porches_duration_ns < (params->hfp_ns.min + params->hbp_ns.min))) {
412	drm_err(dev, "Invalid horizontal porches duration: %uns\n",
413	porches_duration_ns);
414	return -EINVAL;
415	}
416
417	if (bt601) {
418	hfp = params->bt601_hfp;
419	} else {
420	unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min,
421	pixel_duration_ns);
422	unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min,
423	pixel_duration_ns);
424	int porches_rem = porches - hfp_min - hbp_min;
425
426	hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
427	}
428
429	drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp);
430
431	hfp_duration_ns = hfp * pixel_duration_ns;
432	if (!bt601 &&
433	(hfp_duration_ns < params->hfp_ns.min ||
434	hfp_duration_ns > params->hfp_ns.max)) {
435	drm_err(dev, "Invalid horizontal front porch duration: %uns (min: %u, max %u)\n",
436	hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max);
437	return -EINVAL;
438	}
439
440	hbp = porches - hfp;
441	drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp);
442
443	hbp_duration_ns = hbp * pixel_duration_ns;
444	if (!bt601 &&
445	(hbp_duration_ns < params->hbp_ns.min ||
446	hbp_duration_ns > params->hbp_ns.max)) {
447	drm_err(dev, "Invalid horizontal back porch duration: %uns (min: %u, max %u)\n",
448	hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max);
449	return -EINVAL;
450	}
451
452	if (htotal != (hactive + hfp + hslen + hbp))
453	return -EINVAL;
454
455	mode->clock = pixel_clock_hz / 1000;
456	mode->hdisplay = hactive;
457	mode->hsync_start = mode->hdisplay + hfp;
458	mode->hsync_end = mode->hsync_start + hslen;
459	mode->htotal = mode->hsync_end + hbp;
460
461	if (interlace) {
462	vfp_min = params->vfp_lines.even + params->vfp_lines.odd;
463	vbp_min = params->vbp_lines.even + params->vbp_lines.odd;
464	vslen = params->vslen_lines.even + params->vslen_lines.odd;
465	} else {
466	/*
467	* By convention, NTSC (aka 525/60) systems start with
468	* the even field, but PAL (aka 625/50) systems start
469	* with the odd one.
470	*
471	* PAL systems also have asymmetric timings between the
472	* even and odd field, while NTSC is symmetric.
473	*
474	* Moreover, if we want to create a progressive mode for
475	* PAL, we need to use the odd field timings.
476	*
477	* Since odd == even for NTSC, we can just use the odd
478	* one all the time to simplify the code a bit.
479	*/
480	vfp_min = params->vfp_lines.odd;
481	vbp_min = params->vbp_lines.odd;
482	vslen = params->vslen_lines.odd;
483	}
484
485	drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen);
486
487	porches = params->num_lines - vactive - vslen;
488	drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches);
489
490	porches_rem = porches - vfp_min - vbp_min;
491	vfp = vfp_min + (porches_rem / 2);
492	drm_dbg_kms(dev, "Vertical Front Porch: %u\n", vfp);
493
494	vbp = porches - vfp;
495	drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp);
496
497	vtotal = vactive + vfp + vslen + vbp;
498	if (params->num_lines != vtotal) {
499	drm_err(dev, "Invalid vertical total: %upx (expected %upx)\n",
500	vtotal, params->num_lines);
501	return -EINVAL;
502	}
503
504	mode->vdisplay = vactive;
505	mode->vsync_start = mode->vdisplay + vfp;
506	mode->vsync_end = mode->vsync_start + vslen;
507	mode->vtotal = mode->vsync_end + vbp;
508
509	if (mode->vtotal != params->num_lines)
510	return -EINVAL;
511
512	mode->type = DRM_MODE_TYPE_DRIVER;
513	mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
514	if (interlace)
515	mode->flags |= DRM_MODE_FLAG_INTERLACE;
516
517	drm_mode_set_name(mode);
518
519	drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
520
521	return 0;
522	}
523
524	/**
525	* drm_analog_tv_mode - create a display mode for an analog TV
526	* @dev: drm device
527	* @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*.
528	* @pixel_clock_hz: Pixel Clock Frequency, in Hertz
529	* @hdisplay: hdisplay size
530	* @vdisplay: vdisplay size
531	* @interlace: whether to compute an interlaced mode
532	*
533	* This function creates a struct drm_display_mode instance suited for
534	* an analog TV output, for one of the usual analog TV modes. Where
535	* this is DRM_MODE_TV_MODE_MONOCHROME, a 625-line mode will be created.
536	*
537	* Note that @hdisplay is larger than the usual constraints for the PAL
538	* and NTSC timings, and we'll choose to ignore most timings constraints
539	* to reach those resolutions.
540	*
541	* Returns:
542	* A pointer to the mode, allocated with drm_mode_create(). Returns NULL
543	* on error.
544	*/
545	struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
546	enum drm_connector_tv_mode tv_mode,
547	unsigned long pixel_clock_hz,
548	unsigned int hdisplay,
549	unsigned int vdisplay,
550	bool interlace)
551	{
552	struct drm_display_mode *mode;
553	enum drm_mode_analog analog;
554	int ret;
555
556	switch (tv_mode) {
557	case DRM_MODE_TV_MODE_NTSC:
558	fallthrough;
559	case DRM_MODE_TV_MODE_NTSC_443:
560	fallthrough;
561	case DRM_MODE_TV_MODE_NTSC_J:
562	fallthrough;
563	case DRM_MODE_TV_MODE_PAL_M:
564	analog = DRM_MODE_ANALOG_NTSC;
565	break;
566
567	case DRM_MODE_TV_MODE_PAL:
568	fallthrough;
569	case DRM_MODE_TV_MODE_PAL_N:
570	fallthrough;
571	case DRM_MODE_TV_MODE_SECAM:
572	fallthrough;
573	case DRM_MODE_TV_MODE_MONOCHROME:
574	analog = DRM_MODE_ANALOG_PAL;
575	break;
576
577	default:
578	return NULL;
579	}
580
581	mode = drm_mode_create(dev);
582	if (!mode)
583	return NULL;
584
585	ret = fill_analog_mode(dev, mode,
586	params: &tv_modes_parameters[analog],
587	pixel_clock_hz, hactive: hdisplay, vactive: vdisplay, interlace);
588	if (ret)
589	goto err_free_mode;
590
591	return mode;
592
593	err_free_mode:
594	drm_mode_destroy(dev, mode);
595	return NULL;
596	}
597	EXPORT_SYMBOL(drm_analog_tv_mode);
598
599	/**
600	* drm_cvt_mode -create a modeline based on the CVT algorithm
601	* @dev: drm device
602	* @hdisplay: hdisplay size
603	* @vdisplay: vdisplay size
604	* @vrefresh: vrefresh rate
605	* @reduced: whether to use reduced blanking
606	* @interlaced: whether to compute an interlaced mode
607	* @margins: whether to add margins (borders)
608	*
609	* This function is called to generate the modeline based on CVT algorithm
610	* according to the hdisplay, vdisplay, vrefresh.
611	* It is based from the VESA(TM) Coordinated Video Timing Generator by
612	* Graham Loveridge April 9, 2003 available at
613	* http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
614	*
615	* And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
616	* What I have done is to translate it by using integer calculation.
617	*
618	* Returns:
619	* The modeline based on the CVT algorithm stored in a drm_display_mode object.
620	* The display mode object is allocated with drm_mode_create(). Returns NULL
621	* when no mode could be allocated.
622	*/
623	struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
624	int vdisplay, int vrefresh,
625	bool reduced, bool interlaced, bool margins)
626	{
627	#define HV_FACTOR 1000
628	/* 1) top/bottom margin size (% of height) - default: 1.8, */
629	#define CVT_MARGIN_PERCENTAGE 18
630	/* 2) character cell horizontal granularity (pixels) - default 8 */
631	#define CVT_H_GRANULARITY 8
632	/* 3) Minimum vertical porch (lines) - default 3 */
633	#define CVT_MIN_V_PORCH 3
634	/* 4) Minimum number of vertical back porch lines - default 6 */
635	#define CVT_MIN_V_BPORCH 6
636	/* Pixel Clock step (kHz) */
637	#define CVT_CLOCK_STEP 250
638	struct drm_display_mode *drm_mode;
639	unsigned int vfieldrate, hperiod;
640	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
641	int interlace;
642	u64 tmp;
643
644	if (!hdisplay || !vdisplay)
645	return NULL;
646
647	/* allocate the drm_display_mode structure. If failure, we will
648	* return directly
649	*/
650	drm_mode = drm_mode_create(dev);
651	if (!drm_mode)
652	return NULL;
653
654	/* the CVT default refresh rate is 60Hz */
655	if (!vrefresh)
656	vrefresh = 60;
657
658	/* the required field fresh rate */
659	if (interlaced)
660	vfieldrate = vrefresh * 2;
661	else
662	vfieldrate = vrefresh;
663
664	/* horizontal pixels */
665	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
666
667	/* determine the left&right borders */
668	hmargin = 0;
669	if (margins) {
670	hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
671	hmargin -= hmargin % CVT_H_GRANULARITY;
672	}
673	/* find the total active pixels */
674	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
675
676	/* find the number of lines per field */
677	if (interlaced)
678	vdisplay_rnd = vdisplay / 2;
679	else
680	vdisplay_rnd = vdisplay;
681
682	/* find the top & bottom borders */
683	vmargin = 0;
684	if (margins)
685	vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
686
687	drm_mode->vdisplay = vdisplay + 2 * vmargin;
688
689	/* Interlaced */
690	if (interlaced)
691	interlace = 1;
692	else
693	interlace = 0;
694
695	/* Determine VSync Width from aspect ratio */
696	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
697	vsync = 4;
698	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
699	vsync = 5;
700	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
701	vsync = 6;
702	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
703	vsync = 7;
704	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
705	vsync = 7;
706	else /* custom */
707	vsync = 10;
708
709	if (!reduced) {
710	/* simplify the GTF calculation */
711	/* 4) Minimum time of vertical sync + back porch interval (µs)
712	* default 550.0
713	*/
714	int tmp1, tmp2;
715	#define CVT_MIN_VSYNC_BP 550
716	/* 3) Nominal HSync width (% of line period) - default 8 */
717	#define CVT_HSYNC_PERCENTAGE 8
718	unsigned int hblank_percentage;
719	int vsyncandback_porch, __maybe_unused vback_porch, hblank;
720
721	/* estimated the horizontal period */
722	tmp1 = HV_FACTOR * 1000000 -
723	CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
724	tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
725	interlace;
726	hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
727
728	tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
729	/* 9. Find number of lines in sync + backporch */
730	if (tmp1 < (vsync + CVT_MIN_V_PORCH))
731	vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
732	else
733	vsyncandback_porch = tmp1;
734	/* 10. Find number of lines in back porch */
735	vback_porch = vsyncandback_porch - vsync;
736	drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
737	vsyncandback_porch + CVT_MIN_V_PORCH;
738	/* 5) Definition of Horizontal blanking time limitation */
739	/* Gradient (%/kHz) - default 600 */
740	#define CVT_M_FACTOR 600
741	/* Offset (%) - default 40 */
742	#define CVT_C_FACTOR 40
743	/* Blanking time scaling factor - default 128 */
744	#define CVT_K_FACTOR 128
745	/* Scaling factor weighting - default 20 */
746	#define CVT_J_FACTOR 20
747	#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
748	#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
749	CVT_J_FACTOR)
750	/* 12. Find ideal blanking duty cycle from formula */
751	hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
752	hperiod / 1000;
753	/* 13. Blanking time */
754	if (hblank_percentage < 20 * HV_FACTOR)
755	hblank_percentage = 20 * HV_FACTOR;
756	hblank = drm_mode->hdisplay * hblank_percentage /
757	(100 * HV_FACTOR - hblank_percentage);
758	hblank -= hblank % (2 * CVT_H_GRANULARITY);
759	/* 14. find the total pixels per line */
760	drm_mode->htotal = drm_mode->hdisplay + hblank;
761	drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
762	drm_mode->hsync_start = drm_mode->hsync_end -
763	(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
764	drm_mode->hsync_start += CVT_H_GRANULARITY -
765	drm_mode->hsync_start % CVT_H_GRANULARITY;
766	/* fill the Vsync values */
767	drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
768	drm_mode->vsync_end = drm_mode->vsync_start + vsync;
769	} else {
770	/* Reduced blanking */
771	/* Minimum vertical blanking interval time (µs)- default 460 */
772	#define CVT_RB_MIN_VBLANK 460
773	/* Fixed number of clocks for horizontal sync */
774	#define CVT_RB_H_SYNC 32
775	/* Fixed number of clocks for horizontal blanking */
776	#define CVT_RB_H_BLANK 160
777	/* Fixed number of lines for vertical front porch - default 3*/
778	#define CVT_RB_VFPORCH 3
779	int vbilines;
780	int tmp1, tmp2;
781	/* 8. Estimate Horizontal period. */
782	tmp1 = HV_FACTOR * 1000000 -
783	CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
784	tmp2 = vdisplay_rnd + 2 * vmargin;
785	hperiod = tmp1 / (tmp2 * vfieldrate);
786	/* 9. Find number of lines in vertical blanking */
787	vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
788	/* 10. Check if vertical blanking is sufficient */
789	if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
790	vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
791	/* 11. Find total number of lines in vertical field */
792	drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
793	/* 12. Find total number of pixels in a line */
794	drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
795	/* Fill in HSync values */
796	drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
797	drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
798	/* Fill in VSync values */
799	drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
800	drm_mode->vsync_end = drm_mode->vsync_start + vsync;
801	}
802	/* 15/13. Find pixel clock frequency (kHz for xf86) */
803	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
804	tmp *= HV_FACTOR * 1000;
805	do_div(tmp, hperiod);
806	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
807	drm_mode->clock = tmp;
808	/* 18/16. Find actual vertical frame frequency */
809	/* ignore - just set the mode flag for interlaced */
810	if (interlaced) {
811	drm_mode->vtotal *= 2;
812	drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
813	}
814	/* Fill the mode line name */
815	drm_mode_set_name(mode: drm_mode);
816	if (reduced)
817	drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
818	DRM_MODE_FLAG_NVSYNC);
819	else
820	drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
821	DRM_MODE_FLAG_NHSYNC);
822
823	return drm_mode;
824	}
825	EXPORT_SYMBOL(drm_cvt_mode);
826
827	/**
828	* drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
829	* @dev: drm device
830	* @hdisplay: hdisplay size
831	* @vdisplay: vdisplay size
832	* @vrefresh: vrefresh rate.
833	* @interlaced: whether to compute an interlaced mode
834	* @margins: desired margin (borders) size
835	* @GTF_M: extended GTF formula parameters
836	* @GTF_2C: extended GTF formula parameters
837	* @GTF_K: extended GTF formula parameters
838	* @GTF_2J: extended GTF formula parameters
839	*
840	* GTF feature blocks specify C and J in multiples of 0.5, so we pass them
841	* in here multiplied by two. For a C of 40, pass in 80.
842	*
843	* Returns:
844	* The modeline based on the full GTF algorithm stored in a drm_display_mode object.
845	* The display mode object is allocated with drm_mode_create(). Returns NULL
846	* when no mode could be allocated.
847	*/
848	struct drm_display_mode *
849	drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
850	int vrefresh, bool interlaced, int margins,
851	int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
852	{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
853	#define GTF_MARGIN_PERCENTAGE 18
854	/* 2) character cell horizontal granularity (pixels) - default 8 */
855	#define GTF_CELL_GRAN 8
856	/* 3) Minimum vertical porch (lines) - default 3 */
857	#define GTF_MIN_V_PORCH 1
858	/* width of vsync in lines */
859	#define V_SYNC_RQD 3
860	/* width of hsync as % of total line */
861	#define H_SYNC_PERCENT 8
862	/* min time of vsync + back porch (microsec) */
863	#define MIN_VSYNC_PLUS_BP 550
864	/* C' and M' are part of the Blanking Duty Cycle computation */
865	#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
866	#define GTF_M_PRIME (GTF_K * GTF_M / 256)
867	struct drm_display_mode *drm_mode;
868	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
869	int top_margin, bottom_margin;
870	int interlace;
871	unsigned int hfreq_est;
872	int vsync_plus_bp, __maybe_unused vback_porch;
873	unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
874	unsigned int __maybe_unused hperiod;
875	unsigned int vfield_rate, __maybe_unused vframe_rate;
876	int left_margin, right_margin;
877	unsigned int total_active_pixels, ideal_duty_cycle;
878	unsigned int hblank, total_pixels, pixel_freq;
879	int hsync, hfront_porch, vodd_front_porch_lines;
880	unsigned int tmp1, tmp2;
881
882	if (!hdisplay || !vdisplay)
883	return NULL;
884
885	drm_mode = drm_mode_create(dev);
886	if (!drm_mode)
887	return NULL;
888
889	/* 1. In order to give correct results, the number of horizontal
890	* pixels requested is first processed to ensure that it is divisible
891	* by the character size, by rounding it to the nearest character
892	* cell boundary:
893	*/
894	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
895	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
896
897	/* 2. If interlace is requested, the number of vertical lines assumed
898	* by the calculation must be halved, as the computation calculates
899	* the number of vertical lines per field.
900	*/
901	if (interlaced)
902	vdisplay_rnd = vdisplay / 2;
903	else
904	vdisplay_rnd = vdisplay;
905
906	/* 3. Find the frame rate required: */
907	if (interlaced)
908	vfieldrate_rqd = vrefresh * 2;
909	else
910	vfieldrate_rqd = vrefresh;
911
912	/* 4. Find number of lines in Top margin: */
913	top_margin = 0;
914	if (margins)
915	top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
916	1000;
917	/* 5. Find number of lines in bottom margin: */
918	bottom_margin = top_margin;
919
920	/* 6. If interlace is required, then set variable interlace: */
921	if (interlaced)
922	interlace = 1;
923	else
924	interlace = 0;
925
926	/* 7. Estimate the Horizontal frequency */
927	{
928	tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
929	tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
930	2 + interlace;
931	hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
932	}
933
934	/* 8. Find the number of lines in V sync + back porch */
935	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
936	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
937	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
938	/* 9. Find the number of lines in V back porch alone: */
939	vback_porch = vsync_plus_bp - V_SYNC_RQD;
940	/* 10. Find the total number of lines in Vertical field period: */
941	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
942	vsync_plus_bp + GTF_MIN_V_PORCH;
943	/* 11. Estimate the Vertical field frequency: */
944	vfieldrate_est = hfreq_est / vtotal_lines;
945	/* 12. Find the actual horizontal period: */
946	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
947
948	/* 13. Find the actual Vertical field frequency: */
949	vfield_rate = hfreq_est / vtotal_lines;
950	/* 14. Find the Vertical frame frequency: */
951	if (interlaced)
952	vframe_rate = vfield_rate / 2;
953	else
954	vframe_rate = vfield_rate;
955	/* 15. Find number of pixels in left margin: */
956	if (margins)
957	left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
958	1000;
959	else
960	left_margin = 0;
961
962	/* 16.Find number of pixels in right margin: */
963	right_margin = left_margin;
964	/* 17.Find total number of active pixels in image and left and right */
965	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
966	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
967	ideal_duty_cycle = GTF_C_PRIME * 1000 -
968	(GTF_M_PRIME * 1000000 / hfreq_est);
969	/* 19.Find the number of pixels in the blanking time to the nearest
970	* double character cell: */
971	hblank = total_active_pixels * ideal_duty_cycle /
972	(100000 - ideal_duty_cycle);
973	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
974	hblank = hblank * 2 * GTF_CELL_GRAN;
975	/* 20.Find total number of pixels: */
976	total_pixels = total_active_pixels + hblank;
977	/* 21.Find pixel clock frequency: */
978	pixel_freq = total_pixels * hfreq_est / 1000;
979	/* Stage 1 computations are now complete; I should really pass
980	* the results to another function and do the Stage 2 computations,
981	* but I only need a few more values so I'll just append the
982	* computations here for now */
983	/* 17. Find the number of pixels in the horizontal sync period: */
984	hsync = H_SYNC_PERCENT * total_pixels / 100;
985	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
986	hsync = hsync * GTF_CELL_GRAN;
987	/* 18. Find the number of pixels in horizontal front porch period */
988	hfront_porch = hblank / 2 - hsync;
989	/* 36. Find the number of lines in the odd front porch period: */
990	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
991
992	/* finally, pack the results in the mode struct */
993	drm_mode->hdisplay = hdisplay_rnd;
994	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
995	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
996	drm_mode->htotal = total_pixels;
997	drm_mode->vdisplay = vdisplay_rnd;
998	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
999	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
1000	drm_mode->vtotal = vtotal_lines;
1001
1002	drm_mode->clock = pixel_freq;
1003
1004	if (interlaced) {
1005	drm_mode->vtotal *= 2;
1006	drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
1007	}
1008
1009	drm_mode_set_name(mode: drm_mode);
1010	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
1011	drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
1012	else
1013	drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
1014
1015	return drm_mode;
1016	}
1017	EXPORT_SYMBOL(drm_gtf_mode_complex);
1018
1019	/**
1020	* drm_gtf_mode - create the modeline based on the GTF algorithm
1021	* @dev: drm device
1022	* @hdisplay: hdisplay size
1023	* @vdisplay: vdisplay size
1024	* @vrefresh: vrefresh rate.
1025	* @interlaced: whether to compute an interlaced mode
1026	* @margins: desired margin (borders) size
1027	*
1028	* return the modeline based on GTF algorithm
1029	*
1030	* This function is to create the modeline based on the GTF algorithm.
1031	* Generalized Timing Formula is derived from:
1032	*
1033	* GTF Spreadsheet by Andy Morrish (1/5/97)
1034	* available at https://www.vesa.org
1035	*
1036	* And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
1037	* What I have done is to translate it by using integer calculation.
1038	* I also refer to the function of fb_get_mode in the file of
1039	* drivers/video/fbmon.c
1040	*
1041	* Standard GTF parameters::
1042	*
1043	* M = 600
1044	* C = 40
1045	* K = 128
1046	* J = 20
1047	*
1048	* Returns:
1049	* The modeline based on the GTF algorithm stored in a drm_display_mode object.
1050	* The display mode object is allocated with drm_mode_create(). Returns NULL
1051	* when no mode could be allocated.
1052	*/
1053	struct drm_display_mode *
1054	drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
1055	bool interlaced, int margins)
1056	{
1057	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
1058	interlaced, margins,
1059	600, 40 * 2, 128, 20 * 2);
1060	}
1061	EXPORT_SYMBOL(drm_gtf_mode);
1062
1063	#ifdef CONFIG_VIDEOMODE_HELPERS
1064	/**
1065	* drm_display_mode_from_videomode - fill in @dmode using @vm,
1066	* @vm: videomode structure to use as source
1067	* @dmode: drm_display_mode structure to use as destination
1068	*
1069	* Fills out @dmode using the display mode specified in @vm.
1070	*/
1071	void drm_display_mode_from_videomode(const struct videomode *vm,
1072	struct drm_display_mode *dmode)
1073	{
1074	dmode->hdisplay = vm->hactive;
1075	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
1076	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
1077	dmode->htotal = dmode->hsync_end + vm->hback_porch;
1078
1079	dmode->vdisplay = vm->vactive;
1080	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
1081	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
1082	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
1083
1084	dmode->clock = vm->pixelclock / 1000;
1085
1086	dmode->flags = 0;
1087	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1088	dmode->flags |= DRM_MODE_FLAG_PHSYNC;
1089	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
1090	dmode->flags |= DRM_MODE_FLAG_NHSYNC;
1091	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1092	dmode->flags |= DRM_MODE_FLAG_PVSYNC;
1093	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
1094	dmode->flags |= DRM_MODE_FLAG_NVSYNC;
1095	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1096	dmode->flags |= DRM_MODE_FLAG_INTERLACE;
1097	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1098	dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
1099	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
1100	dmode->flags |= DRM_MODE_FLAG_DBLCLK;
1101	drm_mode_set_name(mode: dmode);
1102	}
1103	EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
1104
1105	/**
1106	* drm_display_mode_to_videomode - fill in @vm using @dmode,
1107	* @dmode: drm_display_mode structure to use as source
1108	* @vm: videomode structure to use as destination
1109	*
1110	* Fills out @vm using the display mode specified in @dmode.
1111	*/
1112	void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
1113	struct videomode *vm)
1114	{
1115	vm->hactive = dmode->hdisplay;
1116	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
1117	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
1118	vm->hback_porch = dmode->htotal - dmode->hsync_end;
1119
1120	vm->vactive = dmode->vdisplay;
1121	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
1122	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
1123	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
1124
1125	vm->pixelclock = dmode->clock * 1000;
1126
1127	vm->flags = 0;
1128	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
1129	vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
1130	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
1131	vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
1132	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
1133	vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
1134	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
1135	vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
1136	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
1137	vm->flags |= DISPLAY_FLAGS_INTERLACED;
1138	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
1139	vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
1140	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
1141	vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
1142	}
1143	EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
1144
1145	/**
1146	* drm_bus_flags_from_videomode - extract information about pixelclk and
1147	* DE polarity from videomode and store it in a separate variable
1148	* @vm: videomode structure to use
1149	* @bus_flags: information about pixelclk, sync and DE polarity will be stored
1150	* here
1151	*
1152	* Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
1153	* and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
1154	* found in @vm
1155	*/
1156	void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
1157	{
1158	*bus_flags = 0;
1159	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
1160	*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
1161	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
1162	*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
1163
1164	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
1165	*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
1166	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
1167	*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
1168
1169	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
1170	*bus_flags |= DRM_BUS_FLAG_DE_LOW;
1171	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
1172	*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
1173	}
1174	EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
1175
1176	#ifdef CONFIG_OF
1177	/**
1178	* of_get_drm_display_mode - get a drm_display_mode from devicetree
1179	* @np: device_node with the timing specification
1180	* @dmode: will be set to the return value
1181	* @bus_flags: information about pixelclk, sync and DE polarity
1182	* @index: index into the list of display timings in devicetree
1183	*
1184	* This function is expensive and should only be used, if only one mode is to be
1185	* read from DT. To get multiple modes start with of_get_display_timings and
1186	* work with that instead.
1187	*
1188	* Returns:
1189	* 0 on success, a negative errno code when no of videomode node was found.
1190	*/
1191	int of_get_drm_display_mode(struct device_node *np,
1192	struct drm_display_mode *dmode, u32 *bus_flags,
1193	int index)
1194	{
1195	struct videomode vm;
1196	int ret;
1197
1198	ret = of_get_videomode(np, vm: &vm, index);
1199	if (ret)
1200	return ret;
1201
1202	drm_display_mode_from_videomode(&vm, dmode);
1203	if (bus_flags)
1204	drm_bus_flags_from_videomode(&vm, bus_flags);
1205
1206	pr_debug("%pOF: got %dx%d display mode: " DRM_MODE_FMT "\n",
1207	np, vm.hactive, vm.vactive, DRM_MODE_ARG(dmode));
1208
1209	return 0;
1210	}
1211	EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
1212
1213	/**
1214	* of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
1215	* @np: device_node with the panel-timing specification
1216	* @dmode: will be set to the return value
1217	* @bus_flags: information about pixelclk, sync and DE polarity
1218	*
1219	* The mandatory Device Tree properties width-mm and height-mm
1220	* are read and set on the display mode.
1221	*
1222	* Returns:
1223	* Zero on success, negative error code on failure.
1224	*/
1225	int of_get_drm_panel_display_mode(struct device_node *np,
1226	struct drm_display_mode *dmode, u32 *bus_flags)
1227	{
1228	u32 width_mm = 0, height_mm = 0;
1229	struct display_timing timing;
1230	struct videomode vm;
1231	int ret;
1232
1233	ret = of_get_display_timing(np, name: "panel-timing", dt: &timing);
1234	if (ret)
1235	return ret;
1236
1237	videomode_from_timing(dt: &timing, vm: &vm);
1238
1239	memset(dmode, 0, sizeof(*dmode));
1240	drm_display_mode_from_videomode(&vm, dmode);
1241	if (bus_flags)
1242	drm_bus_flags_from_videomode(&vm, bus_flags);
1243
1244	ret = of_property_read_u32(np, propname: "width-mm", out_value: &width_mm);
1245	if (ret)
1246	return ret;
1247
1248	ret = of_property_read_u32(np, propname: "height-mm", out_value: &height_mm);
1249	if (ret)
1250	return ret;
1251
1252	dmode->width_mm = width_mm;
1253	dmode->height_mm = height_mm;
1254
1255	pr_debug(DRM_MODE_FMT "\n", DRM_MODE_ARG(dmode));
1256
1257	return 0;
1258	}
1259	EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
1260	#endif /* CONFIG_OF */
1261	#endif /* CONFIG_VIDEOMODE_HELPERS */
1262
1263	/**
1264	* drm_mode_set_name - set the name on a mode
1265	* @mode: name will be set in this mode
1266	*
1267	* Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
1268	* with an optional 'i' suffix for interlaced modes.
1269	*/
1270	void drm_mode_set_name(struct drm_display_mode *mode)
1271	{
1272	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1273
1274	snprintf(buf: mode->name, DRM_DISPLAY_MODE_LEN, fmt: "%dx%d%s",
1275	mode->hdisplay, mode->vdisplay,
1276	interlaced ? "i" : "");
1277	}
1278	EXPORT_SYMBOL(drm_mode_set_name);
1279
1280	/**
1281	* drm_mode_vrefresh - get the vrefresh of a mode
1282	* @mode: mode
1283	*
1284	* Returns:
1285	* @modes's vrefresh rate in Hz, rounded to the nearest integer.
1286	*/
1287	int drm_mode_vrefresh(const struct drm_display_mode *mode)
1288	{
1289	unsigned int num = 1, den = 1;
1290
1291	if (mode->htotal == 0 || mode->vtotal == 0)
1292	return 0;
1293
1294	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1295	num *= 2;
1296	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
1297	den *= 2;
1298	if (mode->vscan > 1)
1299	den *= mode->vscan;
1300
1301	if (check_mul_overflow(mode->clock, num, &num))
1302	return 0;
1303
1304	if (check_mul_overflow(mode->htotal * mode->vtotal, den, &den))
1305	return 0;
1306
1307	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
1308	}
1309	EXPORT_SYMBOL(drm_mode_vrefresh);
1310
1311	/**
1312	* drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
1313	* @mode: mode to query
1314	* @hdisplay: hdisplay value to fill in
1315	* @vdisplay: vdisplay value to fill in
1316	*
1317	* The vdisplay value will be doubled if the specified mode is a stereo mode of
1318	* the appropriate layout.
1319	*/
1320	void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
1321	int *hdisplay, int *vdisplay)
1322	{
1323	struct drm_display_mode adjusted;
1324
1325	drm_mode_init(dst: &adjusted, src: mode);
1326
1327	drm_mode_set_crtcinfo(p: &adjusted, CRTC_STEREO_DOUBLE_ONLY);
1328	*hdisplay = adjusted.crtc_hdisplay;
1329	*vdisplay = adjusted.crtc_vdisplay;
1330	}
1331	EXPORT_SYMBOL(drm_mode_get_hv_timing);
1332
1333	/**
1334	* drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
1335	* @p: mode
1336	* @adjust_flags: a combination of adjustment flags
1337	*
1338	* Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
1339	*
1340	* - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
1341	* interlaced modes.
1342	* - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
1343	* buffers containing two eyes (only adjust the timings when needed, eg. for
1344	* "frame packing" or "side by side full").
1345	* - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
1346	* be performed for doublescan and vscan > 1 modes respectively.
1347	*/
1348	void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
1349	{
1350	if (!p)
1351	return;
1352
1353	p->crtc_clock = p->clock;
1354	p->crtc_hdisplay = p->hdisplay;
1355	p->crtc_hsync_start = p->hsync_start;
1356	p->crtc_hsync_end = p->hsync_end;
1357	p->crtc_htotal = p->htotal;
1358	p->crtc_hskew = p->hskew;
1359	p->crtc_vdisplay = p->vdisplay;
1360	p->crtc_vsync_start = p->vsync_start;
1361	p->crtc_vsync_end = p->vsync_end;
1362	p->crtc_vtotal = p->vtotal;
1363
1364	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
1365	if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
1366	p->crtc_vdisplay /= 2;
1367	p->crtc_vsync_start /= 2;
1368	p->crtc_vsync_end /= 2;
1369	p->crtc_vtotal /= 2;
1370	}
1371	}
1372
1373	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
1374	if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
1375	p->crtc_vdisplay *= 2;
1376	p->crtc_vsync_start *= 2;
1377	p->crtc_vsync_end *= 2;
1378	p->crtc_vtotal *= 2;
1379	}
1380	}
1381
1382	if (!(adjust_flags & CRTC_NO_VSCAN)) {
1383	if (p->vscan > 1) {
1384	p->crtc_vdisplay *= p->vscan;
1385	p->crtc_vsync_start *= p->vscan;
1386	p->crtc_vsync_end *= p->vscan;
1387	p->crtc_vtotal *= p->vscan;
1388	}
1389	}
1390
1391	if (adjust_flags & CRTC_STEREO_DOUBLE) {
1392	unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
1393
1394	switch (layout) {
1395	case DRM_MODE_FLAG_3D_FRAME_PACKING:
1396	p->crtc_clock *= 2;
1397	p->crtc_vdisplay += p->crtc_vtotal;
1398	p->crtc_vsync_start += p->crtc_vtotal;
1399	p->crtc_vsync_end += p->crtc_vtotal;
1400	p->crtc_vtotal += p->crtc_vtotal;
1401	break;
1402	}
1403	}
1404
1405	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
1406	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
1407	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
1408	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
1409	}
1410	EXPORT_SYMBOL(drm_mode_set_crtcinfo);
1411
1412	/**
1413	* drm_mode_copy - copy the mode
1414	* @dst: mode to overwrite
1415	* @src: mode to copy
1416	*
1417	* Copy an existing mode into another mode, preserving the
1418	* list head of the destination mode.
1419	*/
1420	void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
1421	{
1422	struct list_head head = dst->head;
1423
1424	*dst = *src;
1425	dst->head = head;
1426	}
1427	EXPORT_SYMBOL(drm_mode_copy);
1428
1429	/**
1430	* drm_mode_init - initialize the mode from another mode
1431	* @dst: mode to overwrite
1432	* @src: mode to copy
1433	*
1434	* Copy an existing mode into another mode, zeroing the
1435	* list head of the destination mode. Typically used
1436	* to guarantee the list head is not left with stack
1437	* garbage in on-stack modes.
1438	*/
1439	void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
1440	{
1441	memset(dst, 0, sizeof(*dst));
1442	drm_mode_copy(dst, src);
1443	}
1444	EXPORT_SYMBOL(drm_mode_init);
1445
1446	/**
1447	* drm_mode_duplicate - allocate and duplicate an existing mode
1448	* @dev: drm_device to allocate the duplicated mode for
1449	* @mode: mode to duplicate
1450	*
1451	* Just allocate a new mode, copy the existing mode into it, and return
1452	* a pointer to it. Used to create new instances of established modes.
1453	*
1454	* Returns:
1455	* Pointer to duplicated mode on success, NULL on error.
1456	*/
1457	struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
1458	const struct drm_display_mode *mode)
1459	{
1460	struct drm_display_mode *nmode;
1461
1462	nmode = drm_mode_create(dev);
1463	if (!nmode)
1464	return NULL;
1465
1466	drm_mode_copy(nmode, mode);
1467
1468	return nmode;
1469	}
1470	EXPORT_SYMBOL(drm_mode_duplicate);
1471
1472	static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
1473	const struct drm_display_mode *mode2)
1474	{
1475	return mode1->hdisplay == mode2->hdisplay &&
1476	mode1->hsync_start == mode2->hsync_start &&
1477	mode1->hsync_end == mode2->hsync_end &&
1478	mode1->htotal == mode2->htotal &&
1479	mode1->hskew == mode2->hskew &&
1480	mode1->vdisplay == mode2->vdisplay &&
1481	mode1->vsync_start == mode2->vsync_start &&
1482	mode1->vsync_end == mode2->vsync_end &&
1483	mode1->vtotal == mode2->vtotal &&
1484	mode1->vscan == mode2->vscan;
1485	}
1486
1487	static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1488	const struct drm_display_mode *mode2)
1489	{
1490	/*
1491	* do clock check convert to PICOS
1492	* so fb modes get matched the same
1493	*/
1494	if (mode1->clock && mode2->clock)
1495	return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1496	else
1497	return mode1->clock == mode2->clock;
1498	}
1499
1500	static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1501	const struct drm_display_mode *mode2)
1502	{
1503	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1504	(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1505	}
1506
1507	static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1508	const struct drm_display_mode *mode2)
1509	{
1510	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1511	(mode2->flags & DRM_MODE_FLAG_3D_MASK);
1512	}
1513
1514	static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1515	const struct drm_display_mode *mode2)
1516	{
1517	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1518	}
1519
1520	/**
1521	* drm_mode_match - test modes for (partial) equality
1522	* @mode1: first mode
1523	* @mode2: second mode
1524	* @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1525	*
1526	* Check to see if @mode1 and @mode2 are equivalent.
1527	*
1528	* Returns:
1529	* True if the modes are (partially) equal, false otherwise.
1530	*/
1531	bool drm_mode_match(const struct drm_display_mode *mode1,
1532	const struct drm_display_mode *mode2,
1533	unsigned int match_flags)
1534	{
1535	if (!mode1 && !mode2)
1536	return true;
1537
1538	if (!mode1 || !mode2)
1539	return false;
1540
1541	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1542	!drm_mode_match_timings(mode1, mode2))
1543	return false;
1544
1545	if (match_flags & DRM_MODE_MATCH_CLOCK &&
1546	!drm_mode_match_clock(mode1, mode2))
1547	return false;
1548
1549	if (match_flags & DRM_MODE_MATCH_FLAGS &&
1550	!drm_mode_match_flags(mode1, mode2))
1551	return false;
1552
1553	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1554	!drm_mode_match_3d_flags(mode1, mode2))
1555	return false;
1556
1557	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1558	!drm_mode_match_aspect_ratio(mode1, mode2))
1559	return false;
1560
1561	return true;
1562	}
1563	EXPORT_SYMBOL(drm_mode_match);
1564
1565	/**
1566	* drm_mode_equal - test modes for equality
1567	* @mode1: first mode
1568	* @mode2: second mode
1569	*
1570	* Check to see if @mode1 and @mode2 are equivalent.
1571	*
1572	* Returns:
1573	* True if the modes are equal, false otherwise.
1574	*/
1575	bool drm_mode_equal(const struct drm_display_mode *mode1,
1576	const struct drm_display_mode *mode2)
1577	{
1578	return drm_mode_match(mode1, mode2,
1579	DRM_MODE_MATCH_TIMINGS |
1580	DRM_MODE_MATCH_CLOCK |
1581	DRM_MODE_MATCH_FLAGS |
1582	DRM_MODE_MATCH_3D_FLAGS|
1583	DRM_MODE_MATCH_ASPECT_RATIO);
1584	}
1585	EXPORT_SYMBOL(drm_mode_equal);
1586
1587	/**
1588	* drm_mode_equal_no_clocks - test modes for equality
1589	* @mode1: first mode
1590	* @mode2: second mode
1591	*
1592	* Check to see if @mode1 and @mode2 are equivalent, but
1593	* don't check the pixel clocks.
1594	*
1595	* Returns:
1596	* True if the modes are equal, false otherwise.
1597	*/
1598	bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1599	const struct drm_display_mode *mode2)
1600	{
1601	return drm_mode_match(mode1, mode2,
1602	DRM_MODE_MATCH_TIMINGS |
1603	DRM_MODE_MATCH_FLAGS |
1604	DRM_MODE_MATCH_3D_FLAGS);
1605	}
1606	EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1607
1608	/**
1609	* drm_mode_equal_no_clocks_no_stereo - test modes for equality
1610	* @mode1: first mode
1611	* @mode2: second mode
1612	*
1613	* Check to see if @mode1 and @mode2 are equivalent, but
1614	* don't check the pixel clocks nor the stereo layout.
1615	*
1616	* Returns:
1617	* True if the modes are equal, false otherwise.
1618	*/
1619	bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1620	const struct drm_display_mode *mode2)
1621	{
1622	return drm_mode_match(mode1, mode2,
1623	DRM_MODE_MATCH_TIMINGS |
1624	DRM_MODE_MATCH_FLAGS);
1625	}
1626	EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1627
1628	static enum drm_mode_status
1629	drm_mode_validate_basic(const struct drm_display_mode *mode)
1630	{
1631	if (mode->type & ~DRM_MODE_TYPE_ALL)
1632	return MODE_BAD;
1633
1634	if (mode->flags & ~DRM_MODE_FLAG_ALL)
1635	return MODE_BAD;
1636
1637	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1638	return MODE_BAD;
1639
1640	if (mode->clock == 0)
1641	return MODE_CLOCK_LOW;
1642
1643	if (mode->hdisplay == 0 ||
1644	mode->hsync_start < mode->hdisplay ||
1645	mode->hsync_end < mode->hsync_start ||
1646	mode->htotal < mode->hsync_end)
1647	return MODE_H_ILLEGAL;
1648
1649	if (mode->vdisplay == 0 ||
1650	mode->vsync_start < mode->vdisplay ||
1651	mode->vsync_end < mode->vsync_start ||
1652	mode->vtotal < mode->vsync_end)
1653	return MODE_V_ILLEGAL;
1654
1655	return MODE_OK;
1656	}
1657
1658	/**
1659	* drm_mode_validate_driver - make sure the mode is somewhat sane
1660	* @dev: drm device
1661	* @mode: mode to check
1662	*
1663	* First do basic validation on the mode, and then allow the driver
1664	* to check for device/driver specific limitations via the optional
1665	* &drm_mode_config_helper_funcs.mode_valid hook.
1666	*
1667	* Returns:
1668	* The mode status
1669	*/
1670	enum drm_mode_status
1671	drm_mode_validate_driver(struct drm_device *dev,
1672	const struct drm_display_mode *mode)
1673	{
1674	enum drm_mode_status status;
1675
1676	status = drm_mode_validate_basic(mode);
1677	if (status != MODE_OK)
1678	return status;
1679
1680	if (dev->mode_config.funcs->mode_valid)
1681	return dev->mode_config.funcs->mode_valid(dev, mode);
1682	else
1683	return MODE_OK;
1684	}
1685	EXPORT_SYMBOL(drm_mode_validate_driver);
1686
1687	/**
1688	* drm_mode_validate_size - make sure modes adhere to size constraints
1689	* @mode: mode to check
1690	* @maxX: maximum width
1691	* @maxY: maximum height
1692	*
1693	* This function is a helper which can be used to validate modes against size
1694	* limitations of the DRM device/connector. If a mode is too big its status
1695	* member is updated with the appropriate validation failure code. The list
1696	* itself is not changed.
1697	*
1698	* Returns:
1699	* The mode status
1700	*/
1701	enum drm_mode_status
1702	drm_mode_validate_size(const struct drm_display_mode *mode,
1703	int maxX, int maxY)
1704	{
1705	if (maxX > 0 && mode->hdisplay > maxX)
1706	return MODE_VIRTUAL_X;
1707
1708	if (maxY > 0 && mode->vdisplay > maxY)
1709	return MODE_VIRTUAL_Y;
1710
1711	return MODE_OK;
1712	}
1713	EXPORT_SYMBOL(drm_mode_validate_size);
1714
1715	/**
1716	* drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1717	* @mode: mode to check
1718	* @connector: drm connector under action
1719	*
1720	* This function is a helper which can be used to filter out any YCBCR420
1721	* only mode, when the source doesn't support it.
1722	*
1723	* Returns:
1724	* The mode status
1725	*/
1726	enum drm_mode_status
1727	drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1728	struct drm_connector *connector)
1729	{
1730	if (!connector->ycbcr_420_allowed &&
1731	drm_mode_is_420_only(display: &connector->display_info, mode))
1732	return MODE_NO_420;
1733
1734	return MODE_OK;
1735	}
1736	EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1737
1738	#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1739
1740	static const char * const drm_mode_status_names[] = {
1741	MODE_STATUS(OK),
1742	MODE_STATUS(HSYNC),
1743	MODE_STATUS(VSYNC),
1744	MODE_STATUS(H_ILLEGAL),
1745	MODE_STATUS(V_ILLEGAL),
1746	MODE_STATUS(BAD_WIDTH),
1747	MODE_STATUS(NOMODE),
1748	MODE_STATUS(NO_INTERLACE),
1749	MODE_STATUS(NO_DBLESCAN),
1750	MODE_STATUS(NO_VSCAN),
1751	MODE_STATUS(MEM),
1752	MODE_STATUS(VIRTUAL_X),
1753	MODE_STATUS(VIRTUAL_Y),
1754	MODE_STATUS(MEM_VIRT),
1755	MODE_STATUS(NOCLOCK),
1756	MODE_STATUS(CLOCK_HIGH),
1757	MODE_STATUS(CLOCK_LOW),
1758	MODE_STATUS(CLOCK_RANGE),
1759	MODE_STATUS(BAD_HVALUE),
1760	MODE_STATUS(BAD_VVALUE),
1761	MODE_STATUS(BAD_VSCAN),
1762	MODE_STATUS(HSYNC_NARROW),
1763	MODE_STATUS(HSYNC_WIDE),
1764	MODE_STATUS(HBLANK_NARROW),
1765	MODE_STATUS(HBLANK_WIDE),
1766	MODE_STATUS(VSYNC_NARROW),
1767	MODE_STATUS(VSYNC_WIDE),
1768	MODE_STATUS(VBLANK_NARROW),
1769	MODE_STATUS(VBLANK_WIDE),
1770	MODE_STATUS(PANEL),
1771	MODE_STATUS(INTERLACE_WIDTH),
1772	MODE_STATUS(ONE_WIDTH),
1773	MODE_STATUS(ONE_HEIGHT),
1774	MODE_STATUS(ONE_SIZE),
1775	MODE_STATUS(NO_REDUCED),
1776	MODE_STATUS(NO_STEREO),
1777	MODE_STATUS(NO_420),
1778	MODE_STATUS(STALE),
1779	MODE_STATUS(BAD),
1780	MODE_STATUS(ERROR),
1781	};
1782
1783	#undef MODE_STATUS
1784
1785	const char *drm_get_mode_status_name(enum drm_mode_status status)
1786	{
1787	int index = status + 3;
1788
1789	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1790	return "";
1791
1792	return drm_mode_status_names[index];
1793	}
1794
1795	/**
1796	* drm_mode_prune_invalid - remove invalid modes from mode list
1797	* @dev: DRM device
1798	* @mode_list: list of modes to check
1799	* @verbose: be verbose about it
1800	*
1801	* This helper function can be used to prune a display mode list after
1802	* validation has been completed. All modes whose status is not MODE_OK will be
1803	* removed from the list, and if @verbose the status code and mode name is also
1804	* printed to dmesg.
1805	*/
1806	void drm_mode_prune_invalid(struct drm_device *dev,
1807	struct list_head *mode_list, bool verbose)
1808	{
1809	struct drm_display_mode *mode, *t;
1810
1811	list_for_each_entry_safe(mode, t, mode_list, head) {
1812	if (mode->status != MODE_OK) {
1813	list_del(entry: &mode->head);
1814	if (mode->type & DRM_MODE_TYPE_USERDEF) {
1815	drm_warn(dev, "User-defined mode not supported: "
1816	DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
1817	}
1818	if (verbose) {
1819	drm_dbg_kms(dev, "Rejected mode: " DRM_MODE_FMT " (%s)\n",
1820	DRM_MODE_ARG(mode), drm_get_mode_status_name(mode->status));
1821	}
1822	drm_mode_destroy(dev, mode);
1823	}
1824	}
1825	}
1826	EXPORT_SYMBOL(drm_mode_prune_invalid);
1827
1828	/**
1829	* drm_mode_compare - compare modes for favorability
1830	* @priv: unused
1831	* @lh_a: list_head for first mode
1832	* @lh_b: list_head for second mode
1833	*
1834	* Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1835	* which is better.
1836	*
1837	* Returns:
1838	* Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1839	* positive if @lh_b is better than @lh_a.
1840	*/
1841	static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1842	const struct list_head *lh_b)
1843	{
1844	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1845	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1846	int diff;
1847
1848	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1849	((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1850	if (diff)
1851	return diff;
1852	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1853	if (diff)
1854	return diff;
1855
1856	diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1857	if (diff)
1858	return diff;
1859
1860	diff = b->clock - a->clock;
1861	return diff;
1862	}
1863
1864	/**
1865	* drm_mode_sort - sort mode list
1866	* @mode_list: list of drm_display_mode structures to sort
1867	*
1868	* Sort @mode_list by favorability, moving good modes to the head of the list.
1869	*/
1870	void drm_mode_sort(struct list_head *mode_list)
1871	{
1872	list_sort(NULL, head: mode_list, cmp: drm_mode_compare);
1873	}
1874	EXPORT_SYMBOL(drm_mode_sort);
1875
1876	/**
1877	* drm_connector_list_update - update the mode list for the connector
1878	* @connector: the connector to update
1879	*
1880	* This moves the modes from the @connector probed_modes list
1881	* to the actual mode list. It compares the probed mode against the current
1882	* list and only adds different/new modes.
1883	*
1884	* This is just a helper functions doesn't validate any modes itself and also
1885	* doesn't prune any invalid modes. Callers need to do that themselves.
1886	*/
1887	void drm_connector_list_update(struct drm_connector *connector)
1888	{
1889	struct drm_display_mode *pmode, *pt;
1890
1891	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1892
1893	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1894	struct drm_display_mode *mode;
1895	bool found_it = false;
1896
1897	/* go through current modes checking for the new probed mode */
1898	list_for_each_entry(mode, &connector->modes, head) {
1899	if (!drm_mode_equal(pmode, mode))
1900	continue;
1901
1902	found_it = true;
1903
1904	/*
1905	* If the old matching mode is stale (ie. left over
1906	* from a previous probe) just replace it outright.
1907	* Otherwise just merge the type bits between all
1908	* equal probed modes.
1909	*
1910	* If two probed modes are considered equal, pick the
1911	* actual timings from the one that's marked as
1912	* preferred (in case the match isn't 100%). If
1913	* multiple or zero preferred modes are present, favor
1914	* the mode added to the probed_modes list first.
1915	*/
1916	if (mode->status == MODE_STALE) {
1917	drm_mode_copy(mode, pmode);
1918	} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1919	(pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1920	pmode->type |= mode->type;
1921	drm_mode_copy(mode, pmode);
1922	} else {
1923	mode->type |= pmode->type;
1924	}
1925
1926	list_del(entry: &pmode->head);
1927	drm_mode_destroy(connector->dev, pmode);
1928	break;
1929	}
1930
1931	if (!found_it) {
1932	list_move_tail(list: &pmode->head, head: &connector->modes);
1933	}
1934	}
1935	}
1936	EXPORT_SYMBOL(drm_connector_list_update);
1937
1938	static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1939	struct drm_cmdline_mode *mode)
1940	{
1941	unsigned int bpp;
1942
1943	if (str[0] != '-')
1944	return -EINVAL;
1945
1946	str++;
1947	bpp = simple_strtol(str, end_ptr, 10);
1948	if (*end_ptr == str)
1949	return -EINVAL;
1950
1951	mode->bpp = bpp;
1952	mode->bpp_specified = true;
1953
1954	return 0;
1955	}
1956
1957	static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1958	struct drm_cmdline_mode *mode)
1959	{
1960	unsigned int refresh;
1961
1962	if (str[0] != '@')
1963	return -EINVAL;
1964
1965	str++;
1966	refresh = simple_strtol(str, end_ptr, 10);
1967	if (*end_ptr == str)
1968	return -EINVAL;
1969
1970	mode->refresh = refresh;
1971	mode->refresh_specified = true;
1972
1973	return 0;
1974	}
1975
1976	static int drm_mode_parse_cmdline_extra(const char *str, int length,
1977	bool freestanding,
1978	const struct drm_connector *connector,
1979	struct drm_cmdline_mode *mode)
1980	{
1981	int i;
1982
1983	for (i = 0; i < length; i++) {
1984	switch (str[i]) {
1985	case 'i':
1986	if (freestanding)
1987	return -EINVAL;
1988
1989	mode->interlace = true;
1990	break;
1991	case 'm':
1992	if (freestanding)
1993	return -EINVAL;
1994
1995	mode->margins = true;
1996	break;
1997	case 'D':
1998	if (mode->force != DRM_FORCE_UNSPECIFIED)
1999	return -EINVAL;
2000
2001	if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
2002	(connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
2003	mode->force = DRM_FORCE_ON;
2004	else
2005	mode->force = DRM_FORCE_ON_DIGITAL;
2006	break;
2007	case 'd':
2008	if (mode->force != DRM_FORCE_UNSPECIFIED)
2009	return -EINVAL;
2010
2011	mode->force = DRM_FORCE_OFF;
2012	break;
2013	case 'e':
2014	if (mode->force != DRM_FORCE_UNSPECIFIED)
2015	return -EINVAL;
2016
2017	mode->force = DRM_FORCE_ON;
2018	break;
2019	default:
2020	return -EINVAL;
2021	}
2022	}
2023
2024	return 0;
2025	}
2026
2027	static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
2028	bool extras,
2029	const struct drm_connector *connector,
2030	struct drm_cmdline_mode *mode)
2031	{
2032	const char *str_start = str;
2033	bool rb = false, cvt = false;
2034	int xres = 0, yres = 0;
2035	int remaining, i;
2036	char *end_ptr;
2037
2038	xres = simple_strtol(str, &end_ptr, 10);
2039	if (end_ptr == str)
2040	return -EINVAL;
2041
2042	if (end_ptr[0] != 'x')
2043	return -EINVAL;
2044	end_ptr++;
2045
2046	str = end_ptr;
2047	yres = simple_strtol(str, &end_ptr, 10);
2048	if (end_ptr == str)
2049	return -EINVAL;
2050
2051	remaining = length - (end_ptr - str_start);
2052	if (remaining < 0)
2053	return -EINVAL;
2054
2055	for (i = 0; i < remaining; i++) {
2056	switch (end_ptr[i]) {
2057	case 'M':
2058	cvt = true;
2059	break;
2060	case 'R':
2061	rb = true;
2062	break;
2063	default:
2064	/*
2065	* Try to pass that to our extras parsing
2066	* function to handle the case where the
2067	* extras are directly after the resolution
2068	*/
2069	if (extras) {
2070	int ret = drm_mode_parse_cmdline_extra(str: end_ptr + i,
2071	length: 1,
2072	freestanding: false,
2073	connector,
2074	mode);
2075	if (ret)
2076	return ret;
2077	} else {
2078	return -EINVAL;
2079	}
2080	}
2081	}
2082
2083	mode->xres = xres;
2084	mode->yres = yres;
2085	mode->cvt = cvt;
2086	mode->rb = rb;
2087
2088	return 0;
2089	}
2090
2091	static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
2092	{
2093	const char *value;
2094	char *endp;
2095
2096	/*
2097	* delim must point to the '=', otherwise it is a syntax error and
2098	* if delim points to the terminating zero, then delim + 1 will point
2099	* past the end of the string.
2100	*/
2101	if (*delim != '=')
2102	return -EINVAL;
2103
2104	value = delim + 1;
2105	*int_ret = simple_strtol(value, &endp, 10);
2106
2107	/* Make sure we have parsed something */
2108	if (endp == value)
2109	return -EINVAL;
2110
2111	return 0;
2112	}
2113
2114	static int drm_mode_parse_panel_orientation(const char *delim,
2115	struct drm_cmdline_mode *mode)
2116	{
2117	const char *value;
2118
2119	if (*delim != '=')
2120	return -EINVAL;
2121
2122	value = delim + 1;
2123	delim = strchr(value, ',');
2124	if (!delim)
2125	delim = value + strlen(value);
2126
2127	if (!strncmp(value, "normal", delim - value))
2128	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
2129	else if (!strncmp(value, "upside_down", delim - value))
2130	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
2131	else if (!strncmp(value, "left_side_up", delim - value))
2132	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
2133	else if (!strncmp(value, "right_side_up", delim - value))
2134	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
2135	else
2136	return -EINVAL;
2137
2138	return 0;
2139	}
2140
2141	static int drm_mode_parse_tv_mode(const char *delim,
2142	struct drm_cmdline_mode *mode)
2143	{
2144	const char *value;
2145	int ret;
2146
2147	if (*delim != '=')
2148	return -EINVAL;
2149
2150	value = delim + 1;
2151	delim = strchr(value, ',');
2152	if (!delim)
2153	delim = value + strlen(value);
2154
2155	ret = drm_get_tv_mode_from_name(name: value, len: delim - value);
2156	if (ret < 0)
2157	return ret;
2158
2159	mode->tv_mode_specified = true;
2160	mode->tv_mode = ret;
2161
2162	return 0;
2163	}
2164
2165	static int drm_mode_parse_cmdline_options(const char *str,
2166	bool freestanding,
2167	const struct drm_connector *connector,
2168	struct drm_cmdline_mode *mode)
2169	{
2170	unsigned int deg, margin, rotation = 0;
2171	const char *delim, *option, *sep;
2172
2173	option = str;
2174	do {
2175	delim = strchr(option, '=');
2176	if (!delim) {
2177	delim = strchr(option, ',');
2178
2179	if (!delim)
2180	delim = option + strlen(option);
2181	}
2182
2183	if (!strncmp(option, "rotate", delim - option)) {
2184	if (drm_mode_parse_cmdline_int(delim, int_ret: &deg))
2185	return -EINVAL;
2186
2187	switch (deg) {
2188	case 0:
2189	rotation |= DRM_MODE_ROTATE_0;
2190	break;
2191
2192	case 90:
2193	rotation |= DRM_MODE_ROTATE_90;
2194	break;
2195
2196	case 180:
2197	rotation |= DRM_MODE_ROTATE_180;
2198	break;
2199
2200	case 270:
2201	rotation |= DRM_MODE_ROTATE_270;
2202	break;
2203
2204	default:
2205	return -EINVAL;
2206	}
2207	} else if (!strncmp(option, "reflect_x", delim - option)) {
2208	rotation |= DRM_MODE_REFLECT_X;
2209	} else if (!strncmp(option, "reflect_y", delim - option)) {
2210	rotation |= DRM_MODE_REFLECT_Y;
2211	} else if (!strncmp(option, "margin_right", delim - option)) {
2212	if (drm_mode_parse_cmdline_int(delim, int_ret: &margin))
2213	return -EINVAL;
2214
2215	mode->tv_margins.right = margin;
2216	} else if (!strncmp(option, "margin_left", delim - option)) {
2217	if (drm_mode_parse_cmdline_int(delim, int_ret: &margin))
2218	return -EINVAL;
2219
2220	mode->tv_margins.left = margin;
2221	} else if (!strncmp(option, "margin_top", delim - option)) {
2222	if (drm_mode_parse_cmdline_int(delim, int_ret: &margin))
2223	return -EINVAL;
2224
2225	mode->tv_margins.top = margin;
2226	} else if (!strncmp(option, "margin_bottom", delim - option)) {
2227	if (drm_mode_parse_cmdline_int(delim, int_ret: &margin))
2228	return -EINVAL;
2229
2230	mode->tv_margins.bottom = margin;
2231	} else if (!strncmp(option, "panel_orientation", delim - option)) {
2232	if (drm_mode_parse_panel_orientation(delim, mode))
2233	return -EINVAL;
2234	} else if (!strncmp(option, "tv_mode", delim - option)) {
2235	if (drm_mode_parse_tv_mode(delim, mode))
2236	return -EINVAL;
2237	} else {
2238	return -EINVAL;
2239	}
2240	sep = strchr(delim, ',');
2241	option = sep + 1;
2242	} while (sep);
2243
2244	if (rotation && freestanding)
2245	return -EINVAL;
2246
2247	if (!(rotation & DRM_MODE_ROTATE_MASK))
2248	rotation |= DRM_MODE_ROTATE_0;
2249
2250	/* Make sure there is exactly one rotation defined */
2251	if (!is_power_of_2(n: rotation & DRM_MODE_ROTATE_MASK))
2252	return -EINVAL;
2253
2254	mode->rotation_reflection = rotation;
2255
2256	return 0;
2257	}
2258
2259	struct drm_named_mode {
2260	const char *name;
2261	unsigned int pixel_clock_khz;
2262	unsigned int xres;
2263	unsigned int yres;
2264	unsigned int flags;
2265	unsigned int tv_mode;
2266	};
2267
2268	#define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode) \
2269	{ \
2270	.name = _name, \
2271	.pixel_clock_khz = _pclk, \
2272	.xres = _x, \
2273	.yres = _y, \
2274	.flags = _flags, \
2275	.tv_mode = _mode, \
2276	}
2277
2278	static const struct drm_named_mode drm_named_modes[] = {
2279	NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
2280	NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
2281	NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
2282	NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
2283	};
2284
2285	static int drm_mode_parse_cmdline_named_mode(const char *name,
2286	unsigned int name_end,
2287	struct drm_cmdline_mode *cmdline_mode)
2288	{
2289	unsigned int i;
2290
2291	if (!name_end)
2292	return 0;
2293
2294	/* If the name starts with a digit, it's not a named mode */
2295	if (isdigit(c: name[0]))
2296	return 0;
2297
2298	/*
2299	* If there's an equal sign in the name, the command-line
2300	* contains only an option and no mode.
2301	*/
2302	if (strnchr(name, name_end, '='))
2303	return 0;
2304
2305	/* The connection status extras can be set without a mode. */
2306	if (name_end == 1 &&
2307	(name[0] == 'd' || name[0] == 'D' || name[0] == 'e'))
2308	return 0;
2309
2310	/*
2311	* We're sure we're a named mode at this point, iterate over the
2312	* list of modes we're aware of.
2313	*/
2314	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2315	const struct drm_named_mode *mode = &drm_named_modes[i];
2316	int ret;
2317
2318	ret = str_has_prefix(str: name, prefix: mode->name);
2319	if (ret != name_end)
2320	continue;
2321
2322	strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
2323	cmdline_mode->pixel_clock = mode->pixel_clock_khz;
2324	cmdline_mode->xres = mode->xres;
2325	cmdline_mode->yres = mode->yres;
2326	cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
2327	cmdline_mode->tv_mode = mode->tv_mode;
2328	cmdline_mode->tv_mode_specified = true;
2329	cmdline_mode->specified = true;
2330
2331	return 1;
2332	}
2333
2334	return -EINVAL;
2335	}
2336
2337	/**
2338	* drm_mode_parse_command_line_for_connector - parse command line modeline for connector
2339	* @mode_option: optional per connector mode option
2340	* @connector: connector to parse modeline for
2341	* @mode: preallocated drm_cmdline_mode structure to fill out
2342	*
2343	* This parses @mode_option command line modeline for modes and options to
2344	* configure the connector.
2345	*
2346	* This uses the same parameters as the fb modedb.c, except for an extra
2347	* force-enable, force-enable-digital and force-disable bit at the end::
2348	*
2349	* <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
2350	*
2351	* Additionals options can be provided following the mode, using a comma to
2352	* separate each option. Valid options can be found in
2353	* Documentation/fb/modedb.rst.
2354	*
2355	* The intermediate drm_cmdline_mode structure is required to store additional
2356	* options from the command line modline like the force-enable/disable flag.
2357	*
2358	* Returns:
2359	* True if a valid modeline has been parsed, false otherwise.
2360	*/
2361	bool drm_mode_parse_command_line_for_connector(const char *mode_option,
2362	const struct drm_connector *connector,
2363	struct drm_cmdline_mode *mode)
2364	{
2365	const char *name;
2366	bool freestanding = false, parse_extras = false;
2367	unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
2368	unsigned int mode_end = 0;
2369	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
2370	const char *options_ptr = NULL;
2371	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
2372	int len, ret;
2373
2374	memset(mode, 0, sizeof(*mode));
2375	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
2376
2377	if (!mode_option)
2378	return false;
2379
2380	name = mode_option;
2381
2382	/* Locate the start of named options */
2383	options_ptr = strchr(name, ',');
2384	if (options_ptr)
2385	options_off = options_ptr - name;
2386	else
2387	options_off = strlen(name);
2388
2389	/* Try to locate the bpp and refresh specifiers, if any */
2390	bpp_ptr = strnchr(name, options_off, '-');
2391	while (bpp_ptr && !isdigit(c: bpp_ptr[1]))
2392	bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
2393	if (bpp_ptr)
2394	bpp_off = bpp_ptr - name;
2395
2396	refresh_ptr = strnchr(name, options_off, '@');
2397	if (refresh_ptr)
2398	refresh_off = refresh_ptr - name;
2399
2400	/* Locate the end of the name / resolution, and parse it */
2401	if (bpp_ptr) {
2402	mode_end = bpp_off;
2403	} else if (refresh_ptr) {
2404	mode_end = refresh_off;
2405	} else if (options_ptr) {
2406	mode_end = options_off;
2407	parse_extras = true;
2408	} else {
2409	mode_end = strlen(name);
2410	parse_extras = true;
2411	}
2412
2413	if (!mode_end)
2414	return false;
2415
2416	ret = drm_mode_parse_cmdline_named_mode(name, name_end: mode_end, cmdline_mode: mode);
2417	if (ret < 0)
2418	return false;
2419
2420	/*
2421	* Having a mode that starts by a letter (and thus is named) and
2422	* an at-sign (used to specify a refresh rate) is disallowed.
2423	*/
2424	if (ret && refresh_ptr)
2425	return false;
2426
2427	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
2428	if (!mode->specified && isdigit(c: name[0])) {
2429	ret = drm_mode_parse_cmdline_res_mode(str: name, length: mode_end,
2430	extras: parse_extras,
2431	connector,
2432	mode);
2433	if (ret)
2434	return false;
2435
2436	mode->specified = true;
2437	}
2438
2439	/* No mode? Check for freestanding extras and/or options */
2440	if (!mode->specified) {
2441	unsigned int len = strlen(mode_option);
2442
2443	if (bpp_ptr || refresh_ptr)
2444	return false; /* syntax error */
2445
2446	if (len == 1 || (len >= 2 && mode_option[1] == ','))
2447	extra_ptr = mode_option;
2448	else
2449	options_ptr = mode_option - 1;
2450
2451	freestanding = true;
2452	}
2453
2454	if (bpp_ptr) {
2455	ret = drm_mode_parse_cmdline_bpp(str: bpp_ptr, end_ptr: &bpp_end_ptr, mode);
2456	if (ret)
2457	return false;
2458
2459	mode->bpp_specified = true;
2460	}
2461
2462	if (refresh_ptr) {
2463	ret = drm_mode_parse_cmdline_refresh(str: refresh_ptr,
2464	end_ptr: &refresh_end_ptr, mode);
2465	if (ret)
2466	return false;
2467
2468	mode->refresh_specified = true;
2469	}
2470
2471	/*
2472	* Locate the end of the bpp / refresh, and parse the extras
2473	* if relevant
2474	*/
2475	if (bpp_ptr && refresh_ptr)
2476	extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
2477	else if (bpp_ptr)
2478	extra_ptr = bpp_end_ptr;
2479	else if (refresh_ptr)
2480	extra_ptr = refresh_end_ptr;
2481
2482	if (extra_ptr) {
2483	if (options_ptr)
2484	len = options_ptr - extra_ptr;
2485	else
2486	len = strlen(extra_ptr);
2487
2488	ret = drm_mode_parse_cmdline_extra(str: extra_ptr, length: len, freestanding,
2489	connector, mode);
2490	if (ret)
2491	return false;
2492	}
2493
2494	if (options_ptr) {
2495	ret = drm_mode_parse_cmdline_options(str: options_ptr + 1,
2496	freestanding,
2497	connector, mode);
2498	if (ret)
2499	return false;
2500	}
2501
2502	return true;
2503	}
2504	EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
2505
2506	static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
2507	struct drm_cmdline_mode *cmd)
2508	{
2509	unsigned int i;
2510
2511	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2512	const struct drm_named_mode *named_mode = &drm_named_modes[i];
2513
2514	if (strcmp(cmd->name, named_mode->name))
2515	continue;
2516
2517	if (!cmd->tv_mode_specified)
2518	continue;
2519
2520	return drm_analog_tv_mode(dev,
2521	named_mode->tv_mode,
2522	named_mode->pixel_clock_khz * 1000,
2523	named_mode->xres,
2524	named_mode->yres,
2525	named_mode->flags & DRM_MODE_FLAG_INTERLACE);
2526	}
2527
2528	return NULL;
2529	}
2530
2531	/**
2532	* drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
2533	* @dev: DRM device to create the new mode for
2534	* @cmd: input command line modeline
2535	*
2536	* Returns:
2537	* Pointer to converted mode on success, NULL on error.
2538	*/
2539	struct drm_display_mode *
2540	drm_mode_create_from_cmdline_mode(struct drm_device *dev,
2541	struct drm_cmdline_mode *cmd)
2542	{
2543	struct drm_display_mode *mode;
2544
2545	if (cmd->xres == 0 || cmd->yres == 0)
2546	return NULL;
2547
2548	if (strlen(cmd->name))
2549	mode = drm_named_mode(dev, cmd);
2550	else if (cmd->cvt)
2551	mode = drm_cvt_mode(dev,
2552	cmd->xres, cmd->yres,
2553	cmd->refresh_specified ? cmd->refresh : 60,
2554	cmd->rb, cmd->interlace,
2555	cmd->margins);
2556	else
2557	mode = drm_gtf_mode(dev,
2558	cmd->xres, cmd->yres,
2559	cmd->refresh_specified ? cmd->refresh : 60,
2560	cmd->interlace,
2561	cmd->margins);
2562	if (!mode)
2563	return NULL;
2564
2565	mode->type |= DRM_MODE_TYPE_USERDEF;
2566	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
2567	if (cmd->xres == 1366)
2568	drm_mode_fixup_1366x768(mode);
2569	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
2570	return mode;
2571	}
2572	EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
2573
2574	/**
2575	* drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
2576	* @out: drm_mode_modeinfo struct to return to the user
2577	* @in: drm_display_mode to use
2578	*
2579	* Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
2580	* the user.
2581	*/
2582	void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
2583	const struct drm_display_mode *in)
2584	{
2585	out->clock = in->clock;
2586	out->hdisplay = in->hdisplay;
2587	out->hsync_start = in->hsync_start;
2588	out->hsync_end = in->hsync_end;
2589	out->htotal = in->htotal;
2590	out->hskew = in->hskew;
2591	out->vdisplay = in->vdisplay;
2592	out->vsync_start = in->vsync_start;
2593	out->vsync_end = in->vsync_end;
2594	out->vtotal = in->vtotal;
2595	out->vscan = in->vscan;
2596	out->vrefresh = drm_mode_vrefresh(in);
2597	out->flags = in->flags;
2598	out->type = in->type;
2599
2600	switch (in->picture_aspect_ratio) {
2601	case HDMI_PICTURE_ASPECT_4_3:
2602	out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
2603	break;
2604	case HDMI_PICTURE_ASPECT_16_9:
2605	out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
2606	break;
2607	case HDMI_PICTURE_ASPECT_64_27:
2608	out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
2609	break;
2610	case HDMI_PICTURE_ASPECT_256_135:
2611	out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
2612	break;
2613	default:
2614	WARN(1, "Invalid aspect ratio (0%x) on mode\n",
2615	in->picture_aspect_ratio);
2616	fallthrough;
2617	case HDMI_PICTURE_ASPECT_NONE:
2618	out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2619	break;
2620	}
2621
2622	strscpy_pad(out->name, in->name, sizeof(out->name));
2623	}
2624
2625	/**
2626	* drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2627	* @dev: drm device
2628	* @out: drm_display_mode to return to the user
2629	* @in: drm_mode_modeinfo to use
2630	*
2631	* Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2632	* the caller.
2633	*
2634	* Returns:
2635	* Zero on success, negative errno on failure.
2636	*/
2637	int drm_mode_convert_umode(struct drm_device *dev,
2638	struct drm_display_mode *out,
2639	const struct drm_mode_modeinfo *in)
2640	{
2641	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2642	return -ERANGE;
2643
2644	out->clock = in->clock;
2645	out->hdisplay = in->hdisplay;
2646	out->hsync_start = in->hsync_start;
2647	out->hsync_end = in->hsync_end;
2648	out->htotal = in->htotal;
2649	out->hskew = in->hskew;
2650	out->vdisplay = in->vdisplay;
2651	out->vsync_start = in->vsync_start;
2652	out->vsync_end = in->vsync_end;
2653	out->vtotal = in->vtotal;
2654	out->vscan = in->vscan;
2655	out->flags = in->flags;
2656	/*
2657	* Old xf86-video-vmware (possibly others too) used to
2658	* leave 'type' uninitialized. Just ignore any bits we
2659	* don't like. It's a just hint after all, and more
2660	* useful for the kernel->userspace direction anyway.
2661	*/
2662	out->type = in->type & DRM_MODE_TYPE_ALL;
2663	strscpy_pad(out->name, in->name, sizeof(out->name));
2664
2665	/* Clearing picture aspect ratio bits from out flags,
2666	* as the aspect-ratio information is not stored in
2667	* flags for kernel-mode, but in picture_aspect_ratio.
2668	*/
2669	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2670
2671	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2672	case DRM_MODE_FLAG_PIC_AR_4_3:
2673	out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2674	break;
2675	case DRM_MODE_FLAG_PIC_AR_16_9:
2676	out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2677	break;
2678	case DRM_MODE_FLAG_PIC_AR_64_27:
2679	out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2680	break;
2681	case DRM_MODE_FLAG_PIC_AR_256_135:
2682	out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2683	break;
2684	case DRM_MODE_FLAG_PIC_AR_NONE:
2685	out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2686	break;
2687	default:
2688	return -EINVAL;
2689	}
2690
2691	out->status = drm_mode_validate_driver(dev, out);
2692	if (out->status != MODE_OK)
2693	return -EINVAL;
2694
2695	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2696
2697	return 0;
2698	}
2699
2700	/**
2701	* drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2702	* output format
2703	*
2704	* @display: display under action
2705	* @mode: video mode to be tested.
2706	*
2707	* Returns:
2708	* true if the mode can be supported in YCBCR420 format
2709	* false if not.
2710	*/
2711	bool drm_mode_is_420_only(const struct drm_display_info *display,
2712	const struct drm_display_mode *mode)
2713	{
2714	u8 vic = drm_match_cea_mode(to_match: mode);
2715
2716	return test_bit(vic, display->hdmi.y420_vdb_modes);
2717	}
2718	EXPORT_SYMBOL(drm_mode_is_420_only);
2719
2720	/**
2721	* drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2722	* output format also (along with RGB/YCBCR444/422)
2723	*
2724	* @display: display under action.
2725	* @mode: video mode to be tested.
2726	*
2727	* Returns:
2728	* true if the mode can be support YCBCR420 format
2729	* false if not.
2730	*/
2731	bool drm_mode_is_420_also(const struct drm_display_info *display,
2732	const struct drm_display_mode *mode)
2733	{
2734	u8 vic = drm_match_cea_mode(to_match: mode);
2735
2736	return test_bit(vic, display->hdmi.y420_cmdb_modes);
2737	}
2738	EXPORT_SYMBOL(drm_mode_is_420_also);
2739	/**
2740	* drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2741	* output format
2742	*
2743	* @display: display under action.
2744	* @mode: video mode to be tested.
2745	*
2746	* Returns:
2747	* true if the mode can be supported in YCBCR420 format
2748	* false if not.
2749	*/
2750	bool drm_mode_is_420(const struct drm_display_info *display,
2751	const struct drm_display_mode *mode)
2752	{
2753	return drm_mode_is_420_only(display, mode) ||
2754	drm_mode_is_420_also(display, mode);
2755	}
2756	EXPORT_SYMBOL(drm_mode_is_420);
2757
2758	/**
2759	* drm_set_preferred_mode - Sets the preferred mode of a connector
2760	* @connector: connector whose mode list should be processed
2761	* @hpref: horizontal resolution of preferred mode
2762	* @vpref: vertical resolution of preferred mode
2763	*
2764	* Marks a mode as preferred if it matches the resolution specified by @hpref
2765	* and @vpref.
2766	*/
2767	void drm_set_preferred_mode(struct drm_connector *connector,
2768	int hpref, int vpref)
2769	{
2770	struct drm_display_mode *mode;
2771
2772	list_for_each_entry(mode, &connector->probed_modes, head) {
2773	if (mode->hdisplay == hpref &&
2774	mode->vdisplay == vpref)
2775	mode->type |= DRM_MODE_TYPE_PREFERRED;
2776	}
2777	}
2778	EXPORT_SYMBOL(drm_set_preferred_mode);
2779