1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2021, ASPEED Technology Inc.
3// Authors: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
4
5#include <linux/firmware.h>
6#include <linux/delay.h>
7
8#include <drm/drm_atomic.h>
9#include <drm/drm_atomic_state_helper.h>
10#include <drm/drm_edid.h>
11#include <drm/drm_modeset_helper_vtables.h>
12#include <drm/drm_print.h>
13#include <drm/drm_probe_helper.h>
14
15#include "ast_drv.h"
16#include "ast_vbios.h"
17
18struct ast_astdp_mode_index_table_entry {
19 unsigned int hdisplay;
20 unsigned int vdisplay;
21 unsigned int mode_index;
22};
23
24/* FIXME: Do refresh rate and flags actually matter? */
25static const struct ast_astdp_mode_index_table_entry ast_astdp_mode_index_table[] = {
26 { 320, 240, ASTDP_320x240_60 },
27 { 400, 300, ASTDP_400x300_60 },
28 { 512, 384, ASTDP_512x384_60 },
29 { 640, 480, ASTDP_640x480_60 },
30 { 800, 600, ASTDP_800x600_56 },
31 { 1024, 768, ASTDP_1024x768_60 },
32 { 1152, 864, ASTDP_1152x864_75 },
33 { 1280, 800, ASTDP_1280x800_60_RB },
34 { 1280, 1024, ASTDP_1280x1024_60 },
35 { 1360, 768, ASTDP_1366x768_60 }, // same as 1366x786
36 { 1366, 768, ASTDP_1366x768_60 },
37 { 1440, 900, ASTDP_1440x900_60_RB },
38 { 1600, 900, ASTDP_1600x900_60_RB },
39 { 1600, 1200, ASTDP_1600x1200_60 },
40 { 1680, 1050, ASTDP_1680x1050_60_RB },
41 { 1920, 1080, ASTDP_1920x1080_60 },
42 { 1920, 1200, ASTDP_1920x1200_60 },
43 { 0 }
44};
45
46struct ast_astdp_connector_state {
47 struct drm_connector_state base;
48
49 int mode_index;
50};
51
52static struct ast_astdp_connector_state *
53to_ast_astdp_connector_state(const struct drm_connector_state *state)
54{
55 return container_of(state, struct ast_astdp_connector_state, base);
56}
57
58static int ast_astdp_get_mode_index(unsigned int hdisplay, unsigned int vdisplay)
59{
60 const struct ast_astdp_mode_index_table_entry *entry = ast_astdp_mode_index_table;
61
62 while (entry->hdisplay && entry->vdisplay) {
63 if (entry->hdisplay == hdisplay && entry->vdisplay == vdisplay)
64 return entry->mode_index;
65 ++entry;
66 }
67
68 return -EINVAL;
69}
70
71static bool ast_astdp_is_connected(struct ast_device *ast)
72{
73 if (!ast_get_index_reg_mask(ast, AST_IO_VGACRI, index: 0xDF, AST_IO_VGACRDF_HPD))
74 return false;
75 /*
76 * HPD might be set even if no monitor is connected, so also check that
77 * the link training was successful.
78 */
79 if (!ast_get_index_reg_mask(ast, AST_IO_VGACRI, index: 0xDC, AST_IO_VGACRDC_LINK_SUCCESS))
80 return false;
81 return true;
82}
83
84static int ast_astdp_read_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
85{
86 struct ast_device *ast = data;
87 size_t rdlen = round_up(len, 4);
88 int ret = 0;
89 unsigned int i;
90
91 if (block > 0)
92 return -EIO; /* extension headers not supported */
93
94 /*
95 * Protect access to I/O registers from concurrent modesetting
96 * by acquiring the I/O-register lock.
97 */
98 mutex_lock(&ast->modeset_lock);
99
100 /* Start reading EDID data */
101 ast_set_index_reg_mask(ast, AST_IO_VGACRI, index: 0xe5, preserve_mask: (u8)~AST_IO_VGACRE5_EDID_READ_DONE, val: 0x00);
102
103 for (i = 0; i < rdlen; i += 4) {
104 unsigned int offset;
105 unsigned int j;
106 u8 ediddata[4];
107 u8 vgacre4;
108
109 offset = (i + block * EDID_LENGTH) / 4;
110 if (offset >= 64) {
111 ret = -EIO;
112 goto out;
113 }
114 vgacre4 = offset;
115
116 /*
117 * CRE4[7:0]: Read-Pointer for EDID (Unit: 4bytes); valid range: 0~64
118 */
119 ast_set_index_reg(ast, AST_IO_VGACRI, index: 0xe4, val: vgacre4);
120
121 /*
122 * CRD7[b0]: valid flag for EDID
123 * CRD6[b0]: mirror read pointer for EDID
124 */
125 for (j = 0; j < 200; ++j) {
126 u8 vgacrd7, vgacrd6;
127
128 /*
129 * Delay are getting longer with each retry.
130 *
131 * 1. No delay on first try
132 * 2. The Delays are often 2 loops when users request "Display Settings"
133 * of right-click of mouse.
134 * 3. The Delays are often longer a lot when system resume from S3/S4.
135 */
136 if (j)
137 msleep(msecs: j + 1);
138
139 /* Wait for EDID offset to show up in mirror register */
140 vgacrd7 = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xd7);
141 if (vgacrd7 & AST_IO_VGACRD7_EDID_VALID_FLAG) {
142 vgacrd6 = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xd6);
143 if (vgacrd6 == offset)
144 break;
145 }
146 }
147 if (j == 200) {
148 ret = -EBUSY;
149 goto out;
150 }
151
152 ediddata[0] = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xd8);
153 ediddata[1] = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xd9);
154 ediddata[2] = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xda);
155 ediddata[3] = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xdb);
156
157 if (i == 31) {
158 /*
159 * For 128-bytes EDID_1.3,
160 * 1. Add the value of Bytes-126 to Bytes-127.
161 * The Bytes-127 is Checksum. Sum of all 128bytes should
162 * equal 0 (mod 256).
163 * 2. Modify Bytes-126 to be 0.
164 * The Bytes-126 indicates the Number of extensions to
165 * follow. 0 represents noextensions.
166 */
167 ediddata[3] = ediddata[3] + ediddata[2];
168 ediddata[2] = 0;
169 }
170
171 memcpy(buf, ediddata, min((len - i), 4));
172 buf += 4;
173 }
174
175out:
176 /* Signal end of reading */
177 ast_set_index_reg_mask(ast, AST_IO_VGACRI, index: 0xe5, preserve_mask: (u8)~AST_IO_VGACRE5_EDID_READ_DONE,
178 AST_IO_VGACRE5_EDID_READ_DONE);
179
180 mutex_unlock(lock: &ast->modeset_lock);
181
182 return ret;
183}
184
185/*
186 * Launch Aspeed DP
187 */
188int ast_dp_launch(struct ast_device *ast)
189{
190 struct drm_device *dev = &ast->base;
191 unsigned int i = 10;
192
193 while (i) {
194 u8 vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xd1);
195
196 if (vgacrd1 & AST_IO_VGACRD1_MCU_FW_EXECUTING)
197 break;
198 --i;
199 msleep(msecs: 100);
200 }
201 if (!i) {
202 drm_err(dev, "Wait DPMCU executing timeout\n");
203 return -ENODEV;
204 }
205
206 ast_set_index_reg_mask(ast, AST_IO_VGACRI, index: 0xe5,
207 preserve_mask: (u8) ~AST_IO_VGACRE5_EDID_READ_DONE,
208 AST_IO_VGACRE5_EDID_READ_DONE);
209
210 return 0;
211}
212
213static bool ast_dp_get_phy_sleep(struct ast_device *ast)
214{
215 u8 vgacre3 = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xe3);
216
217 return (vgacre3 & AST_IO_VGACRE3_DP_PHY_SLEEP);
218}
219
220static void ast_dp_set_phy_sleep(struct ast_device *ast, bool sleep)
221{
222 u8 vgacre3 = 0x00;
223
224 if (sleep)
225 vgacre3 |= AST_IO_VGACRE3_DP_PHY_SLEEP;
226
227 ast_set_index_reg_mask(ast, AST_IO_VGACRI, index: 0xe3, preserve_mask: (u8)~AST_IO_VGACRE3_DP_PHY_SLEEP,
228 val: vgacre3);
229 msleep(msecs: 50);
230}
231
232static void ast_dp_link_training(struct ast_device *ast)
233{
234 struct drm_device *dev = &ast->base;
235 int i;
236
237 for (i = 0; i < 10; i++) {
238 u8 vgacrdc;
239
240 if (i)
241 msleep(msecs: 100);
242
243 vgacrdc = ast_get_index_reg(ast, AST_IO_VGACRI, index: 0xdc);
244 if (vgacrdc & AST_IO_VGACRDC_LINK_SUCCESS)
245 return;
246 }
247 drm_err(dev, "Link training failed\n");
248}
249
250static bool __ast_dp_wait_enable(struct ast_device *ast, bool enabled)
251{
252 u8 vgacrdf_test = 0x00;
253 u8 vgacrdf;
254 unsigned int i;
255
256 if (enabled)
257 vgacrdf_test |= AST_IO_VGACRDF_DP_VIDEO_ENABLE;
258
259 for (i = 0; i < 1000; ++i) {
260 if (i)
261 mdelay(1);
262 vgacrdf = ast_get_index_reg_mask(ast, AST_IO_VGACRI, index: 0xdf,
263 AST_IO_VGACRDF_DP_VIDEO_ENABLE);
264 if (vgacrdf == vgacrdf_test)
265 return true;
266 }
267
268 return false;
269}
270
271static void ast_dp_set_enable(struct ast_device *ast, bool enabled)
272{
273 struct drm_device *dev = &ast->base;
274 u8 vgacre3 = 0x00;
275
276 if (enabled)
277 vgacre3 |= AST_IO_VGACRE3_DP_VIDEO_ENABLE;
278
279 ast_set_index_reg_mask(ast, AST_IO_VGACRI, index: 0xe3, preserve_mask: (u8)~AST_IO_VGACRE3_DP_VIDEO_ENABLE,
280 val: vgacre3);
281
282 drm_WARN_ON(dev, !__ast_dp_wait_enable(ast, enabled));
283}
284
285static void ast_wait_for_vretrace(struct ast_device *ast)
286{
287 unsigned long timeout = jiffies + HZ;
288 u8 vgair1;
289
290 do {
291 vgair1 = ast_io_read8(ast, AST_IO_VGAIR1_R);
292 } while (!(vgair1 & AST_IO_VGAIR1_VREFRESH) && time_before(jiffies, timeout));
293}
294
295/*
296 * Encoder
297 */
298
299static const struct drm_encoder_funcs ast_astdp_encoder_funcs = {
300 .destroy = drm_encoder_cleanup,
301};
302
303static enum drm_mode_status
304ast_astdp_encoder_helper_mode_valid(struct drm_encoder *encoder,
305 const struct drm_display_mode *mode)
306{
307 int res;
308
309 res = ast_astdp_get_mode_index(hdisplay: mode->hdisplay, vdisplay: mode->vdisplay);
310 if (res < 0)
311 return MODE_NOMODE;
312
313 return MODE_OK;
314}
315
316static void ast_astdp_encoder_helper_atomic_mode_set(struct drm_encoder *encoder,
317 struct drm_crtc_state *crtc_state,
318 struct drm_connector_state *conn_state)
319{
320 struct drm_device *dev = encoder->dev;
321 struct ast_device *ast = to_ast_device(dev);
322 struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc_state);
323 const struct ast_vbios_enhtable *vmode = ast_crtc_state->vmode;
324 struct ast_astdp_connector_state *astdp_conn_state =
325 to_ast_astdp_connector_state(state: conn_state);
326 int mode_index = astdp_conn_state->mode_index;
327 u8 refresh_rate_index;
328 u8 vgacre0, vgacre1, vgacre2;
329
330 if (drm_WARN_ON(dev, vmode->refresh_rate_index < 1 || vmode->refresh_rate_index > 255))
331 return;
332 refresh_rate_index = vmode->refresh_rate_index - 1;
333
334 /* FIXME: Why are we doing this? */
335 switch (mode_index) {
336 case ASTDP_1280x800_60_RB:
337 case ASTDP_1440x900_60_RB:
338 case ASTDP_1600x900_60_RB:
339 case ASTDP_1680x1050_60_RB:
340 mode_index = (u8)(mode_index - (u8)refresh_rate_index);
341 break;
342 default:
343 mode_index = (u8)(mode_index + (u8)refresh_rate_index);
344 break;
345 }
346
347 /*
348 * CRE0[7:0]: MISC0 ((0x00: 18-bpp) or (0x20: 24-bpp)
349 * CRE1[7:0]: MISC1 (default: 0x00)
350 * CRE2[7:0]: video format index (0x00 ~ 0x20 or 0x40 ~ 0x50)
351 */
352 vgacre0 = AST_IO_VGACRE0_24BPP;
353 vgacre1 = 0x00;
354 vgacre2 = mode_index & 0xff;
355
356 ast_set_index_reg(ast, AST_IO_VGACRI, index: 0xe0, val: vgacre0);
357 ast_set_index_reg(ast, AST_IO_VGACRI, index: 0xe1, val: vgacre1);
358 ast_set_index_reg(ast, AST_IO_VGACRI, index: 0xe2, val: vgacre2);
359}
360
361static void ast_astdp_encoder_helper_atomic_enable(struct drm_encoder *encoder,
362 struct drm_atomic_state *state)
363{
364 struct ast_device *ast = to_ast_device(dev: encoder->dev);
365 struct ast_connector *ast_connector = &ast->output.astdp.connector;
366
367 if (ast_connector->physical_status == connector_status_connected) {
368 ast_dp_set_phy_sleep(ast, sleep: false);
369 ast_dp_link_training(ast);
370
371 ast_wait_for_vretrace(ast);
372 ast_dp_set_enable(ast, enabled: true);
373 }
374}
375
376static void ast_astdp_encoder_helper_atomic_disable(struct drm_encoder *encoder,
377 struct drm_atomic_state *state)
378{
379 struct ast_device *ast = to_ast_device(dev: encoder->dev);
380
381 ast_dp_set_enable(ast, enabled: false);
382 ast_dp_set_phy_sleep(ast, sleep: true);
383}
384
385static int ast_astdp_encoder_helper_atomic_check(struct drm_encoder *encoder,
386 struct drm_crtc_state *crtc_state,
387 struct drm_connector_state *conn_state)
388{
389 const struct drm_display_mode *mode = &crtc_state->mode;
390 struct ast_astdp_connector_state *astdp_conn_state =
391 to_ast_astdp_connector_state(state: conn_state);
392 int res;
393
394 if (drm_atomic_crtc_needs_modeset(state: crtc_state)) {
395 res = ast_astdp_get_mode_index(hdisplay: mode->hdisplay, vdisplay: mode->vdisplay);
396 if (res < 0)
397 return res;
398 astdp_conn_state->mode_index = res;
399 }
400
401 return 0;
402}
403
404static const struct drm_encoder_helper_funcs ast_astdp_encoder_helper_funcs = {
405 .mode_valid = ast_astdp_encoder_helper_mode_valid,
406 .atomic_mode_set = ast_astdp_encoder_helper_atomic_mode_set,
407 .atomic_enable = ast_astdp_encoder_helper_atomic_enable,
408 .atomic_disable = ast_astdp_encoder_helper_atomic_disable,
409 .atomic_check = ast_astdp_encoder_helper_atomic_check,
410};
411
412/*
413 * Connector
414 */
415
416static int ast_astdp_connector_helper_get_modes(struct drm_connector *connector)
417{
418 struct ast_connector *ast_connector = to_ast_connector(connector);
419 int count;
420
421 if (ast_connector->physical_status == connector_status_connected) {
422 struct ast_device *ast = to_ast_device(dev: connector->dev);
423 const struct drm_edid *drm_edid;
424
425 drm_edid = drm_edid_read_custom(connector, read_block: ast_astdp_read_edid_block, context: ast);
426 drm_edid_connector_update(connector, edid: drm_edid);
427 count = drm_edid_connector_add_modes(connector);
428 drm_edid_free(drm_edid);
429 } else {
430 drm_edid_connector_update(connector, NULL);
431
432 /*
433 * There's no EDID data without a connected monitor. Set BMC-
434 * compatible modes in this case. The XGA default resolution
435 * should work well for all BMCs.
436 */
437 count = drm_add_modes_noedid(connector, hdisplay: 4096, vdisplay: 4096);
438 if (count)
439 drm_set_preferred_mode(connector, hpref: 1024, vpref: 768);
440 }
441
442 return count;
443}
444
445static int ast_astdp_connector_helper_detect_ctx(struct drm_connector *connector,
446 struct drm_modeset_acquire_ctx *ctx,
447 bool force)
448{
449 struct ast_connector *ast_connector = to_ast_connector(connector);
450 struct ast_device *ast = to_ast_device(dev: connector->dev);
451 enum drm_connector_status status = connector_status_disconnected;
452 bool phy_sleep;
453
454 mutex_lock(&ast->modeset_lock);
455
456 phy_sleep = ast_dp_get_phy_sleep(ast);
457 if (phy_sleep)
458 ast_dp_set_phy_sleep(ast, sleep: false);
459
460 if (ast_astdp_is_connected(ast))
461 status = connector_status_connected;
462
463 if (phy_sleep && status == connector_status_disconnected)
464 ast_dp_set_phy_sleep(ast, sleep: true);
465
466 mutex_unlock(lock: &ast->modeset_lock);
467
468 if (status != ast_connector->physical_status)
469 ++connector->epoch_counter;
470 ast_connector->physical_status = status;
471
472 return connector_status_connected;
473}
474
475static const struct drm_connector_helper_funcs ast_astdp_connector_helper_funcs = {
476 .get_modes = ast_astdp_connector_helper_get_modes,
477 .detect_ctx = ast_astdp_connector_helper_detect_ctx,
478};
479
480static void ast_astdp_connector_reset(struct drm_connector *connector)
481{
482 struct ast_astdp_connector_state *astdp_state =
483 kzalloc(sizeof(*astdp_state), GFP_KERNEL);
484
485 if (connector->state)
486 connector->funcs->atomic_destroy_state(connector, connector->state);
487
488 if (astdp_state)
489 __drm_atomic_helper_connector_reset(connector, conn_state: &astdp_state->base);
490 else
491 __drm_atomic_helper_connector_reset(connector, NULL);
492}
493
494static struct drm_connector_state *
495ast_astdp_connector_atomic_duplicate_state(struct drm_connector *connector)
496{
497 struct ast_astdp_connector_state *new_astdp_state, *astdp_state;
498 struct drm_device *dev = connector->dev;
499
500 if (drm_WARN_ON(dev, !connector->state))
501 return NULL;
502
503 new_astdp_state = kmalloc(sizeof(*new_astdp_state), GFP_KERNEL);
504 if (!new_astdp_state)
505 return NULL;
506 __drm_atomic_helper_connector_duplicate_state(connector, state: &new_astdp_state->base);
507
508 astdp_state = to_ast_astdp_connector_state(state: connector->state);
509
510 new_astdp_state->mode_index = astdp_state->mode_index;
511
512 return &new_astdp_state->base;
513}
514
515static void ast_astdp_connector_atomic_destroy_state(struct drm_connector *connector,
516 struct drm_connector_state *state)
517{
518 struct ast_astdp_connector_state *astdp_state = to_ast_astdp_connector_state(state);
519
520 __drm_atomic_helper_connector_destroy_state(state: &astdp_state->base);
521 kfree(objp: astdp_state);
522}
523
524static const struct drm_connector_funcs ast_astdp_connector_funcs = {
525 .reset = ast_astdp_connector_reset,
526 .fill_modes = drm_helper_probe_single_connector_modes,
527 .destroy = drm_connector_cleanup,
528 .atomic_duplicate_state = ast_astdp_connector_atomic_duplicate_state,
529 .atomic_destroy_state = ast_astdp_connector_atomic_destroy_state,
530};
531
532/*
533 * Output
534 */
535
536int ast_astdp_output_init(struct ast_device *ast)
537{
538 struct drm_device *dev = &ast->base;
539 struct drm_crtc *crtc = &ast->crtc;
540 struct drm_encoder *encoder;
541 struct ast_connector *ast_connector;
542 struct drm_connector *connector;
543 int ret;
544
545 /* encoder */
546
547 encoder = &ast->output.astdp.encoder;
548 ret = drm_encoder_init(dev, encoder, funcs: &ast_astdp_encoder_funcs,
549 DRM_MODE_ENCODER_TMDS, NULL);
550 if (ret)
551 return ret;
552 drm_encoder_helper_add(encoder, funcs: &ast_astdp_encoder_helper_funcs);
553
554 encoder->possible_crtcs = drm_crtc_mask(crtc);
555
556 /* connector */
557
558 ast_connector = &ast->output.astdp.connector;
559 connector = &ast_connector->base;
560 ret = drm_connector_init(dev, connector, funcs: &ast_astdp_connector_funcs,
561 DRM_MODE_CONNECTOR_DisplayPort);
562 if (ret)
563 return ret;
564 drm_connector_helper_add(connector, funcs: &ast_astdp_connector_helper_funcs);
565
566 connector->interlace_allowed = 0;
567 connector->doublescan_allowed = 0;
568 connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
569
570 ast_connector->physical_status = connector->status;
571
572 ret = drm_connector_attach_encoder(connector, encoder);
573 if (ret)
574 return ret;
575
576 return 0;
577}
578

source code of linux/drivers/gpu/drm/ast/ast_dp.c