1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2018 Renesas Electronics
4 *
5 * Copyright (C) 2016 Atmel
6 * Bo Shen <voice.shen@atmel.com>
7 *
8 * Authors: Bo Shen <voice.shen@atmel.com>
9 * Boris Brezillon <boris.brezillon@free-electrons.com>
10 * Wu, Songjun <Songjun.Wu@atmel.com>
11 *
12 * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
13 */
14
15#include <linux/gpio/consumer.h>
16#include <linux/i2c-mux.h>
17#include <linux/i2c.h>
18#include <linux/media-bus-format.h>
19#include <linux/module.h>
20#include <linux/regmap.h>
21#include <linux/regulator/consumer.h>
22#include <linux/clk.h>
23
24#include <drm/drm_atomic_helper.h>
25#include <drm/drm_bridge.h>
26#include <drm/drm_drv.h>
27#include <drm/drm_edid.h>
28#include <drm/drm_print.h>
29#include <drm/drm_probe_helper.h>
30
31#include <sound/hdmi-codec.h>
32
33#define SII902X_TPI_VIDEO_DATA 0x0
34
35#define SII902X_TPI_PIXEL_REPETITION 0x8
36#define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5)
37#define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4)
38#define SII902X_TPI_AVI_PIXEL_REP_4X 3
39#define SII902X_TPI_AVI_PIXEL_REP_2X 1
40#define SII902X_TPI_AVI_PIXEL_REP_NONE 0
41#define SII902X_TPI_CLK_RATIO_HALF (0 << 6)
42#define SII902X_TPI_CLK_RATIO_1X (1 << 6)
43#define SII902X_TPI_CLK_RATIO_2X (2 << 6)
44#define SII902X_TPI_CLK_RATIO_4X (3 << 6)
45
46#define SII902X_TPI_AVI_IN_FORMAT 0x9
47#define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
48#define SII902X_TPI_AVI_INPUT_DITHER BIT(6)
49#define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
50#define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2)
51#define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2)
52#define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0)
53#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
54#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
55#define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0)
56
57#define SII902X_TPI_AVI_INFOFRAME 0x0c
58
59#define SII902X_SYS_CTRL_DATA 0x1a
60#define SII902X_SYS_CTRL_PWR_DWN BIT(4)
61#define SII902X_SYS_CTRL_AV_MUTE BIT(3)
62#define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2)
63#define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1)
64#define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0)
65#define SII902X_SYS_CTRL_OUTPUT_HDMI 1
66#define SII902X_SYS_CTRL_OUTPUT_DVI 0
67
68#define SII902X_REG_CHIPID(n) (0x1b + (n))
69
70#define SII902X_PWR_STATE_CTRL 0x1e
71#define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
72#define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK)
73
74/* Audio */
75#define SII902X_TPI_I2S_ENABLE_MAPPING_REG 0x1f
76#define SII902X_TPI_I2S_CONFIG_FIFO0 (0 << 0)
77#define SII902X_TPI_I2S_CONFIG_FIFO1 (1 << 0)
78#define SII902X_TPI_I2S_CONFIG_FIFO2 (2 << 0)
79#define SII902X_TPI_I2S_CONFIG_FIFO3 (3 << 0)
80#define SII902X_TPI_I2S_LEFT_RIGHT_SWAP (1 << 2)
81#define SII902X_TPI_I2S_AUTO_DOWNSAMPLE (1 << 3)
82#define SII902X_TPI_I2S_SELECT_SD0 (0 << 4)
83#define SII902X_TPI_I2S_SELECT_SD1 (1 << 4)
84#define SII902X_TPI_I2S_SELECT_SD2 (2 << 4)
85#define SII902X_TPI_I2S_SELECT_SD3 (3 << 4)
86#define SII902X_TPI_I2S_FIFO_ENABLE (1 << 7)
87
88#define SII902X_TPI_I2S_INPUT_CONFIG_REG 0x20
89#define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES (0 << 0)
90#define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO (1 << 0)
91#define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST (0 << 1)
92#define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST (1 << 1)
93#define SII902X_TPI_I2S_SD_JUSTIFY_LEFT (0 << 2)
94#define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT (1 << 2)
95#define SII902X_TPI_I2S_WS_POLARITY_LOW (0 << 3)
96#define SII902X_TPI_I2S_WS_POLARITY_HIGH (1 << 3)
97#define SII902X_TPI_I2S_MCLK_MULTIPLIER_128 (0 << 4)
98#define SII902X_TPI_I2S_MCLK_MULTIPLIER_256 (1 << 4)
99#define SII902X_TPI_I2S_MCLK_MULTIPLIER_384 (2 << 4)
100#define SII902X_TPI_I2S_MCLK_MULTIPLIER_512 (3 << 4)
101#define SII902X_TPI_I2S_MCLK_MULTIPLIER_768 (4 << 4)
102#define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024 (5 << 4)
103#define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152 (6 << 4)
104#define SII902X_TPI_I2S_MCLK_MULTIPLIER_192 (7 << 4)
105#define SII902X_TPI_I2S_SCK_EDGE_FALLING (0 << 7)
106#define SII902X_TPI_I2S_SCK_EDGE_RISING (1 << 7)
107
108#define SII902X_TPI_I2S_STRM_HDR_BASE 0x21
109#define SII902X_TPI_I2S_STRM_HDR_SIZE 5
110
111#define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG 0x26
112#define SII902X_TPI_AUDIO_CODING_STREAM_HEADER (0 << 0)
113#define SII902X_TPI_AUDIO_CODING_PCM (1 << 0)
114#define SII902X_TPI_AUDIO_CODING_AC3 (2 << 0)
115#define SII902X_TPI_AUDIO_CODING_MPEG1 (3 << 0)
116#define SII902X_TPI_AUDIO_CODING_MP3 (4 << 0)
117#define SII902X_TPI_AUDIO_CODING_MPEG2 (5 << 0)
118#define SII902X_TPI_AUDIO_CODING_AAC (6 << 0)
119#define SII902X_TPI_AUDIO_CODING_DTS (7 << 0)
120#define SII902X_TPI_AUDIO_CODING_ATRAC (8 << 0)
121#define SII902X_TPI_AUDIO_MUTE_DISABLE (0 << 4)
122#define SII902X_TPI_AUDIO_MUTE_ENABLE (1 << 4)
123#define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS (0 << 5)
124#define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS (1 << 5)
125#define SII902X_TPI_AUDIO_INTERFACE_DISABLE (0 << 6)
126#define SII902X_TPI_AUDIO_INTERFACE_SPDIF (1 << 6)
127#define SII902X_TPI_AUDIO_INTERFACE_I2S (2 << 6)
128
129#define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG 0x27
130#define SII902X_TPI_AUDIO_FREQ_STREAM (0 << 3)
131#define SII902X_TPI_AUDIO_FREQ_32KHZ (1 << 3)
132#define SII902X_TPI_AUDIO_FREQ_44KHZ (2 << 3)
133#define SII902X_TPI_AUDIO_FREQ_48KHZ (3 << 3)
134#define SII902X_TPI_AUDIO_FREQ_88KHZ (4 << 3)
135#define SII902X_TPI_AUDIO_FREQ_96KHZ (5 << 3)
136#define SII902X_TPI_AUDIO_FREQ_176KHZ (6 << 3)
137#define SII902X_TPI_AUDIO_FREQ_192KHZ (7 << 3)
138#define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM (0 << 6)
139#define SII902X_TPI_AUDIO_SAMPLE_SIZE_16 (1 << 6)
140#define SII902X_TPI_AUDIO_SAMPLE_SIZE_20 (2 << 6)
141#define SII902X_TPI_AUDIO_SAMPLE_SIZE_24 (3 << 6)
142
143#define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG 0x28
144
145#define SII902X_INT_ENABLE 0x3c
146#define SII902X_INT_STATUS 0x3d
147#define SII902X_HOTPLUG_EVENT BIT(0)
148#define SII902X_PLUGGED_STATUS BIT(2)
149
150#define SII902X_REG_TPI_RQB 0xc7
151
152/* Indirect internal register access */
153#define SII902X_IND_SET_PAGE 0xbc
154#define SII902X_IND_OFFSET 0xbd
155#define SII902X_IND_VALUE 0xbe
156
157#define SII902X_TPI_MISC_INFOFRAME_BASE 0xbf
158#define SII902X_TPI_MISC_INFOFRAME_END 0xde
159#define SII902X_TPI_MISC_INFOFRAME_SIZE \
160 (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
161
162#define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500
163
164#define SII902X_AUDIO_PORT_INDEX 3
165
166/*
167 * The maximum resolution supported by the HDMI bridge is 1080p@60Hz
168 * and 1920x1200 requiring a pixel clock of 165MHz and the minimum
169 * resolution supported is 480p@60Hz requiring a pixel clock of 25MHz
170 */
171#define SII902X_MIN_PIXEL_CLOCK_KHZ 25000
172#define SII902X_MAX_PIXEL_CLOCK_KHZ 165000
173
174struct sii902x {
175 struct i2c_client *i2c;
176 struct regmap *regmap;
177 struct drm_bridge bridge;
178 struct drm_bridge *next_bridge;
179 struct drm_connector connector;
180 struct gpio_desc *reset_gpio;
181 struct i2c_mux_core *i2cmux;
182 u32 bus_width;
183
184 /*
185 * Mutex protects audio and video functions from interfering
186 * each other, by keeping their i2c command sequences atomic.
187 */
188 struct mutex mutex;
189 struct sii902x_audio {
190 struct platform_device *pdev;
191 struct clk *mclk;
192 u32 i2s_fifo_sequence[4];
193 } audio;
194};
195
196static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
197{
198 union i2c_smbus_data data;
199 int ret;
200
201 ret = __i2c_smbus_xfer(adapter: i2c->adapter, addr: i2c->addr, flags: i2c->flags,
202 I2C_SMBUS_READ, command: reg, I2C_SMBUS_BYTE_DATA, data: &data);
203
204 if (ret < 0)
205 return ret;
206
207 *val = data.byte;
208 return 0;
209}
210
211static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
212{
213 union i2c_smbus_data data;
214
215 data.byte = val;
216
217 return __i2c_smbus_xfer(adapter: i2c->adapter, addr: i2c->addr, flags: i2c->flags,
218 I2C_SMBUS_WRITE, command: reg, I2C_SMBUS_BYTE_DATA,
219 data: &data);
220}
221
222static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
223 u8 val)
224{
225 int ret;
226 u8 status;
227
228 ret = sii902x_read_unlocked(i2c, reg, val: &status);
229 if (ret)
230 return ret;
231 status &= ~mask;
232 status |= val & mask;
233 return sii902x_write_unlocked(i2c, reg, val: status);
234}
235
236static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
237{
238 return container_of(bridge, struct sii902x, bridge);
239}
240
241static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
242{
243 return container_of(con, struct sii902x, connector);
244}
245
246static void sii902x_reset(struct sii902x *sii902x)
247{
248 if (!sii902x->reset_gpio)
249 return;
250
251 gpiod_set_value_cansleep(desc: sii902x->reset_gpio, value: 1);
252
253 /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
254 usleep_range(min: 150, max: 200);
255
256 gpiod_set_value_cansleep(desc: sii902x->reset_gpio, value: 0);
257}
258
259static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)
260{
261 unsigned int status;
262
263 mutex_lock(&sii902x->mutex);
264
265 regmap_read(map: sii902x->regmap, SII902X_INT_STATUS, val: &status);
266
267 mutex_unlock(lock: &sii902x->mutex);
268
269 return (status & SII902X_PLUGGED_STATUS) ?
270 connector_status_connected : connector_status_disconnected;
271}
272
273static enum drm_connector_status
274sii902x_connector_detect(struct drm_connector *connector, bool force)
275{
276 struct sii902x *sii902x = connector_to_sii902x(con: connector);
277
278 return sii902x_detect(sii902x);
279}
280
281static const struct drm_connector_funcs sii902x_connector_funcs = {
282 .detect = sii902x_connector_detect,
283 .fill_modes = drm_helper_probe_single_connector_modes,
284 .destroy = drm_connector_cleanup,
285 .reset = drm_atomic_helper_connector_reset,
286 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
287 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
288};
289
290static const struct drm_edid *sii902x_edid_read(struct sii902x *sii902x,
291 struct drm_connector *connector)
292{
293 const struct drm_edid *drm_edid;
294
295 mutex_lock(&sii902x->mutex);
296
297 drm_edid = drm_edid_read_ddc(connector, adapter: sii902x->i2cmux->adapter[0]);
298
299 mutex_unlock(lock: &sii902x->mutex);
300
301 return drm_edid;
302}
303
304static int sii902x_get_modes(struct drm_connector *connector)
305{
306 struct sii902x *sii902x = connector_to_sii902x(con: connector);
307 const struct drm_edid *drm_edid;
308 int num = 0;
309
310 drm_edid = sii902x_edid_read(sii902x, connector);
311 drm_edid_connector_update(connector, edid: drm_edid);
312 if (drm_edid) {
313 num = drm_edid_connector_add_modes(connector);
314 drm_edid_free(drm_edid);
315 }
316
317 return num;
318}
319
320static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
321 .get_modes = sii902x_get_modes,
322};
323
324static void sii902x_bridge_atomic_disable(struct drm_bridge *bridge,
325 struct drm_atomic_state *state)
326{
327 struct sii902x *sii902x = bridge_to_sii902x(bridge);
328
329 mutex_lock(&sii902x->mutex);
330
331 regmap_update_bits(map: sii902x->regmap, SII902X_SYS_CTRL_DATA,
332 SII902X_SYS_CTRL_PWR_DWN,
333 SII902X_SYS_CTRL_PWR_DWN);
334
335 mutex_unlock(lock: &sii902x->mutex);
336}
337
338static void sii902x_bridge_atomic_enable(struct drm_bridge *bridge,
339 struct drm_atomic_state *state)
340{
341 struct sii902x *sii902x = bridge_to_sii902x(bridge);
342 struct drm_connector *connector;
343 u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
344
345 connector = drm_atomic_get_new_connector_for_encoder(state, encoder: bridge->encoder);
346 if (connector && connector->display_info.is_hdmi)
347 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
348
349 mutex_lock(&sii902x->mutex);
350
351 regmap_update_bits(map: sii902x->regmap, SII902X_SYS_CTRL_DATA,
352 SII902X_SYS_CTRL_OUTPUT_MODE, val: output_mode);
353 regmap_update_bits(map: sii902x->regmap, SII902X_PWR_STATE_CTRL,
354 SII902X_AVI_POWER_STATE_MSK,
355 SII902X_AVI_POWER_STATE_D(0));
356 regmap_update_bits(map: sii902x->regmap, SII902X_SYS_CTRL_DATA,
357 SII902X_SYS_CTRL_PWR_DWN, val: 0);
358
359 mutex_unlock(lock: &sii902x->mutex);
360}
361
362static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
363 const struct drm_display_mode *mode,
364 const struct drm_display_mode *adj)
365{
366 struct sii902x *sii902x = bridge_to_sii902x(bridge);
367 struct regmap *regmap = sii902x->regmap;
368 u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
369 struct hdmi_avi_infoframe frame;
370 u16 pixel_clock_10kHz = adj->clock / 10;
371 int ret;
372
373 buf[0] = pixel_clock_10kHz & 0xff;
374 buf[1] = pixel_clock_10kHz >> 8;
375 buf[2] = drm_mode_vrefresh(mode: adj);
376 buf[3] = 0x00;
377 buf[4] = adj->hdisplay;
378 buf[5] = adj->hdisplay >> 8;
379 buf[6] = adj->vdisplay;
380 buf[7] = adj->vdisplay >> 8;
381 buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
382 SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
383 buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
384 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
385
386 mutex_lock(&sii902x->mutex);
387
388 ret = regmap_bulk_write(map: regmap, SII902X_TPI_VIDEO_DATA, val: buf, val_count: 10);
389 if (ret)
390 goto out;
391
392 ret = drm_hdmi_avi_infoframe_from_display_mode(frame: &frame,
393 connector: &sii902x->connector, mode: adj);
394 if (ret < 0) {
395 DRM_ERROR("couldn't fill AVI infoframe\n");
396 goto out;
397 }
398
399 ret = hdmi_avi_infoframe_pack(frame: &frame, buffer: buf, size: sizeof(buf));
400 if (ret < 0) {
401 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
402 goto out;
403 }
404
405 /* Do not send the infoframe header, but keep the CRC field. */
406 regmap_bulk_write(map: regmap, SII902X_TPI_AVI_INFOFRAME,
407 val: buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
408 HDMI_AVI_INFOFRAME_SIZE + 1);
409
410out:
411 mutex_unlock(lock: &sii902x->mutex);
412}
413
414static int sii902x_bridge_attach(struct drm_bridge *bridge,
415 struct drm_encoder *encoder,
416 enum drm_bridge_attach_flags flags)
417{
418 struct sii902x *sii902x = bridge_to_sii902x(bridge);
419 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
420 struct drm_device *drm = bridge->dev;
421 int ret;
422
423 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
424 return drm_bridge_attach(encoder, bridge: sii902x->next_bridge,
425 previous: bridge, flags);
426
427 drm_connector_helper_add(connector: &sii902x->connector,
428 funcs: &sii902x_connector_helper_funcs);
429
430 if (!drm_core_check_feature(dev: drm, feature: DRIVER_ATOMIC)) {
431 dev_err(&sii902x->i2c->dev,
432 "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
433 return -ENOTSUPP;
434 }
435
436 ret = drm_connector_init(dev: drm, connector: &sii902x->connector,
437 funcs: &sii902x_connector_funcs,
438 DRM_MODE_CONNECTOR_HDMIA);
439 if (ret)
440 return ret;
441
442 if (sii902x->i2c->irq > 0)
443 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
444 else
445 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
446
447 ret = drm_display_info_set_bus_formats(info: &sii902x->connector.display_info,
448 formats: &bus_format, num_formats: 1);
449 if (ret)
450 return ret;
451
452 drm_connector_attach_encoder(connector: &sii902x->connector, encoder);
453
454 return 0;
455}
456
457static enum drm_connector_status
458sii902x_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector)
459{
460 struct sii902x *sii902x = bridge_to_sii902x(bridge);
461
462 return sii902x_detect(sii902x);
463}
464
465static const struct drm_edid *sii902x_bridge_edid_read(struct drm_bridge *bridge,
466 struct drm_connector *connector)
467{
468 struct sii902x *sii902x = bridge_to_sii902x(bridge);
469
470 return sii902x_edid_read(sii902x, connector);
471}
472
473static u32 *sii902x_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
474 struct drm_bridge_state *bridge_state,
475 struct drm_crtc_state *crtc_state,
476 struct drm_connector_state *conn_state,
477 u32 output_fmt,
478 unsigned int *num_input_fmts)
479{
480
481 struct sii902x *sii902x = bridge_to_sii902x(bridge);
482 u32 *input_fmts;
483
484 *num_input_fmts = 0;
485
486 input_fmts = kcalloc(1, sizeof(*input_fmts), GFP_KERNEL);
487 if (!input_fmts)
488 return NULL;
489
490 switch (sii902x->bus_width) {
491 case 16:
492 input_fmts[0] = MEDIA_BUS_FMT_RGB565_1X16;
493 break;
494 case 18:
495 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X18;
496 break;
497 case 24:
498 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
499 break;
500 default:
501 return NULL;
502 }
503
504 *num_input_fmts = 1;
505
506 return input_fmts;
507}
508
509static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
510 struct drm_bridge_state *bridge_state,
511 struct drm_crtc_state *crtc_state,
512 struct drm_connector_state *conn_state)
513{
514 if (crtc_state->mode.clock < SII902X_MIN_PIXEL_CLOCK_KHZ ||
515 crtc_state->mode.clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
516 return -EINVAL;
517
518 /*
519 * There might be flags negotiation supported in future but
520 * set the bus flags in atomic_check statically for now.
521 */
522 bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags;
523
524 return 0;
525}
526
527static enum drm_mode_status
528sii902x_bridge_mode_valid(struct drm_bridge *bridge,
529 const struct drm_display_info *info,
530 const struct drm_display_mode *mode)
531{
532 if (mode->clock < SII902X_MIN_PIXEL_CLOCK_KHZ)
533 return MODE_CLOCK_LOW;
534
535 if (mode->clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
536 return MODE_CLOCK_HIGH;
537
538 return MODE_OK;
539}
540
541static const struct drm_bridge_funcs sii902x_bridge_funcs = {
542 .attach = sii902x_bridge_attach,
543 .mode_set = sii902x_bridge_mode_set,
544 .atomic_disable = sii902x_bridge_atomic_disable,
545 .atomic_enable = sii902x_bridge_atomic_enable,
546 .detect = sii902x_bridge_detect,
547 .edid_read = sii902x_bridge_edid_read,
548 .atomic_reset = drm_atomic_helper_bridge_reset,
549 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
550 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
551 .atomic_get_input_bus_fmts = sii902x_bridge_atomic_get_input_bus_fmts,
552 .atomic_check = sii902x_bridge_atomic_check,
553 .mode_valid = sii902x_bridge_mode_valid,
554};
555
556static int sii902x_mute(struct sii902x *sii902x, bool mute)
557{
558 struct device *dev = &sii902x->i2c->dev;
559 unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
560 SII902X_TPI_AUDIO_MUTE_DISABLE;
561
562 dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
563
564 return regmap_update_bits(map: sii902x->regmap,
565 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
566 SII902X_TPI_AUDIO_MUTE_ENABLE, val);
567}
568
569static const int sii902x_mclk_div_table[] = {
570 128, 256, 384, 512, 768, 1024, 1152, 192 };
571
572static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
573 unsigned int mclk)
574{
575 int div = mclk / rate;
576 int distance = 100000;
577 u8 i, nearest = 0;
578
579 for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
580 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
581
582 if (d >= distance)
583 continue;
584
585 nearest = i;
586 distance = d;
587 if (d == 0)
588 break;
589 }
590
591 *i2s_config_reg |= nearest << 4;
592
593 return sii902x_mclk_div_table[nearest];
594}
595
596static const struct sii902x_sample_freq {
597 u32 freq;
598 u8 val;
599} sii902x_sample_freq[] = {
600 { .freq = 32000, .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
601 { .freq = 44000, .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
602 { .freq = 48000, .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
603 { .freq = 88000, .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
604 { .freq = 96000, .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
605 { .freq = 176000, .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
606 { .freq = 192000, .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
607};
608
609static int sii902x_audio_hw_params(struct device *dev, void *data,
610 struct hdmi_codec_daifmt *daifmt,
611 struct hdmi_codec_params *params)
612{
613 struct sii902x *sii902x = dev_get_drvdata(dev);
614 u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
615 u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
616 SII902X_TPI_AUDIO_MUTE_ENABLE |
617 SII902X_TPI_AUDIO_CODING_PCM);
618 u8 config_byte3_reg = 0;
619 u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
620 unsigned long mclk_rate;
621 int i, ret;
622
623 if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) {
624 dev_dbg(dev, "%s: I2S clock provider mode not supported\n",
625 __func__);
626 return -EINVAL;
627 }
628
629 switch (daifmt->fmt) {
630 case HDMI_I2S:
631 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
632 SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
633 break;
634 case HDMI_RIGHT_J:
635 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
636 break;
637 case HDMI_LEFT_J:
638 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
639 break;
640 default:
641 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
642 daifmt->fmt);
643 return -EINVAL;
644 }
645
646 if (daifmt->bit_clk_inv)
647 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
648 else
649 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
650
651 if (daifmt->frame_clk_inv)
652 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
653 else
654 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
655
656 if (params->channels > 2)
657 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
658 else
659 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
660
661 switch (params->sample_width) {
662 case 16:
663 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
664 break;
665 case 20:
666 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
667 break;
668 case 24:
669 case 32:
670 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
671 break;
672 default:
673 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
674 params->sample_width);
675 return -EINVAL;
676 }
677
678 for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
679 if (params->sample_rate == sii902x_sample_freq[i].freq) {
680 config_byte3_reg |= sii902x_sample_freq[i].val;
681 break;
682 }
683 }
684
685 ret = clk_prepare_enable(clk: sii902x->audio.mclk);
686 if (ret) {
687 dev_err(dev, "Enabling mclk failed: %d\n", ret);
688 return ret;
689 }
690
691 if (sii902x->audio.mclk) {
692 mclk_rate = clk_get_rate(clk: sii902x->audio.mclk);
693 ret = sii902x_select_mclk_div(i2s_config_reg: &i2s_config_reg,
694 rate: params->sample_rate, mclk: mclk_rate);
695 if (mclk_rate != ret * params->sample_rate)
696 dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
697 mclk_rate, ret, params->sample_rate);
698 }
699
700 mutex_lock(&sii902x->mutex);
701
702 ret = regmap_write(map: sii902x->regmap,
703 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
704 val: config_byte2_reg);
705 if (ret < 0)
706 goto out;
707
708 ret = regmap_write(map: sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
709 val: i2s_config_reg);
710 if (ret)
711 goto out;
712
713 for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
714 sii902x->audio.i2s_fifo_sequence[i]; i++)
715 regmap_write(map: sii902x->regmap,
716 SII902X_TPI_I2S_ENABLE_MAPPING_REG,
717 val: sii902x->audio.i2s_fifo_sequence[i]);
718
719 ret = regmap_write(map: sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
720 val: config_byte3_reg);
721 if (ret)
722 goto out;
723
724 ret = regmap_bulk_write(map: sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
725 val: params->iec.status,
726 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
727 sizeof(params->iec.status)));
728 if (ret)
729 goto out;
730
731 ret = hdmi_audio_infoframe_pack(frame: &params->cea, buffer: infoframe_buf,
732 size: sizeof(infoframe_buf));
733 if (ret < 0) {
734 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
735 __func__, ret);
736 goto out;
737 }
738
739 ret = regmap_bulk_write(map: sii902x->regmap,
740 SII902X_TPI_MISC_INFOFRAME_BASE,
741 val: infoframe_buf,
742 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
743 if (ret)
744 goto out;
745
746 /* Decode Level 0 Packets */
747 ret = regmap_write(map: sii902x->regmap, SII902X_IND_SET_PAGE, val: 0x02);
748 if (ret)
749 goto out;
750
751 ret = regmap_write(map: sii902x->regmap, SII902X_IND_OFFSET, val: 0x24);
752 if (ret)
753 goto out;
754
755 ret = regmap_write(map: sii902x->regmap, SII902X_IND_VALUE, val: 0x02);
756 if (ret)
757 goto out;
758
759 dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
760out:
761 mutex_unlock(lock: &sii902x->mutex);
762
763 if (ret) {
764 clk_disable_unprepare(clk: sii902x->audio.mclk);
765 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
766 ret);
767 }
768
769 return ret;
770}
771
772static void sii902x_audio_shutdown(struct device *dev, void *data)
773{
774 struct sii902x *sii902x = dev_get_drvdata(dev);
775
776 mutex_lock(&sii902x->mutex);
777
778 regmap_write(map: sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
779 SII902X_TPI_AUDIO_INTERFACE_DISABLE);
780
781 mutex_unlock(lock: &sii902x->mutex);
782
783 clk_disable_unprepare(clk: sii902x->audio.mclk);
784}
785
786static int sii902x_audio_mute(struct device *dev, void *data,
787 bool enable, int direction)
788{
789 struct sii902x *sii902x = dev_get_drvdata(dev);
790
791 mutex_lock(&sii902x->mutex);
792
793 sii902x_mute(sii902x, mute: enable);
794
795 mutex_unlock(lock: &sii902x->mutex);
796
797 return 0;
798}
799
800static int sii902x_audio_get_eld(struct device *dev, void *data,
801 uint8_t *buf, size_t len)
802{
803 struct sii902x *sii902x = dev_get_drvdata(dev);
804
805 mutex_lock(&sii902x->mutex);
806
807 memcpy(buf, sii902x->connector.eld,
808 min(sizeof(sii902x->connector.eld), len));
809
810 mutex_unlock(lock: &sii902x->mutex);
811
812 return 0;
813}
814
815static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
816 struct device_node *endpoint,
817 void *data)
818{
819 struct of_endpoint of_ep;
820 int ret;
821
822 ret = of_graph_parse_endpoint(node: endpoint, endpoint: &of_ep);
823 if (ret < 0)
824 return ret;
825
826 /*
827 * HDMI sound should be located at reg = <3>
828 * Return expected DAI index 0.
829 */
830 if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
831 return 0;
832
833 return -EINVAL;
834}
835
836static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
837 .hw_params = sii902x_audio_hw_params,
838 .audio_shutdown = sii902x_audio_shutdown,
839 .mute_stream = sii902x_audio_mute,
840 .get_eld = sii902x_audio_get_eld,
841 .get_dai_id = sii902x_audio_get_dai_id,
842};
843
844static int sii902x_audio_codec_init(struct sii902x *sii902x,
845 struct device *dev)
846{
847 static const u8 audio_fifo_id[] = {
848 SII902X_TPI_I2S_CONFIG_FIFO0,
849 SII902X_TPI_I2S_CONFIG_FIFO1,
850 SII902X_TPI_I2S_CONFIG_FIFO2,
851 SII902X_TPI_I2S_CONFIG_FIFO3,
852 };
853 static const u8 i2s_lane_id[] = {
854 SII902X_TPI_I2S_SELECT_SD0,
855 SII902X_TPI_I2S_SELECT_SD1,
856 SII902X_TPI_I2S_SELECT_SD2,
857 SII902X_TPI_I2S_SELECT_SD3,
858 };
859 struct hdmi_codec_pdata codec_data = {
860 .ops = &sii902x_audio_codec_ops,
861 .i2s = 1, /* Only i2s support for now. */
862 .spdif = 0,
863 .max_i2s_channels = 0,
864 .no_capture_mute = 1,
865 };
866 u8 lanes[4];
867 int num_lanes, i;
868
869 if (!of_property_present(np: dev->of_node, propname: "#sound-dai-cells")) {
870 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
871 __func__);
872 return 0;
873 }
874
875 num_lanes = of_property_read_variable_u8_array(np: dev->of_node,
876 propname: "sil,i2s-data-lanes",
877 out_values: lanes, sz_min: 1,
878 ARRAY_SIZE(lanes));
879
880 if (num_lanes == -EINVAL) {
881 dev_dbg(dev,
882 "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
883 __func__);
884 num_lanes = 1;
885 lanes[0] = 0;
886 } else if (num_lanes < 0) {
887 dev_err(dev,
888 "%s: Error getting \"sil,i2s-data-lanes\": %d\n",
889 __func__, num_lanes);
890 return num_lanes;
891 }
892 codec_data.max_i2s_channels = 2 * num_lanes;
893
894 for (i = 0; i < num_lanes; i++)
895 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
896 i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
897
898 sii902x->audio.mclk = devm_clk_get_optional(dev, id: "mclk");
899 if (IS_ERR(ptr: sii902x->audio.mclk)) {
900 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
901 __func__, PTR_ERR(sii902x->audio.mclk));
902 return PTR_ERR(ptr: sii902x->audio.mclk);
903 }
904
905 sii902x->audio.pdev = platform_device_register_data(
906 parent: dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
907 data: &codec_data, size: sizeof(codec_data));
908
909 return PTR_ERR_OR_ZERO(ptr: sii902x->audio.pdev);
910}
911
912static const struct regmap_range sii902x_volatile_ranges[] = {
913 { .range_min = 0, .range_max = 0xff },
914};
915
916static const struct regmap_access_table sii902x_volatile_table = {
917 .yes_ranges = sii902x_volatile_ranges,
918 .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
919};
920
921static const struct regmap_config sii902x_regmap_config = {
922 .reg_bits = 8,
923 .val_bits = 8,
924 .disable_locking = true, /* struct sii902x mutex should be enough */
925 .max_register = SII902X_TPI_MISC_INFOFRAME_END,
926 .volatile_table = &sii902x_volatile_table,
927 .cache_type = REGCACHE_NONE,
928};
929
930static irqreturn_t sii902x_interrupt(int irq, void *data)
931{
932 struct sii902x *sii902x = data;
933 unsigned int status = 0;
934
935 mutex_lock(&sii902x->mutex);
936
937 regmap_read(map: sii902x->regmap, SII902X_INT_STATUS, val: &status);
938 regmap_write(map: sii902x->regmap, SII902X_INT_STATUS, val: status);
939
940 mutex_unlock(lock: &sii902x->mutex);
941
942 if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {
943 drm_helper_hpd_irq_event(dev: sii902x->bridge.dev);
944 drm_bridge_hpd_notify(bridge: &sii902x->bridge, status: (status & SII902X_PLUGGED_STATUS)
945 ? connector_status_connected
946 : connector_status_disconnected);
947 }
948
949 return IRQ_HANDLED;
950}
951
952/*
953 * The purpose of sii902x_i2c_bypass_select is to enable the pass through
954 * mode of the HDMI transmitter. Do not use regmap from within this function,
955 * only use sii902x_*_unlocked functions to read/modify/write registers.
956 * We are holding the parent adapter lock here, keep this in mind before
957 * adding more i2c transactions.
958 *
959 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
960 * in this driver, we need to make sure that we only touch 0x1A[2:1] from
961 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
962 * we leave the remaining bits as we have found them.
963 */
964static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
965{
966 struct sii902x *sii902x = i2c_mux_priv(muxc: mux);
967 struct device *dev = &sii902x->i2c->dev;
968 unsigned long timeout;
969 u8 status;
970 int ret;
971
972 ret = sii902x_update_bits_unlocked(i2c: sii902x->i2c, SII902X_SYS_CTRL_DATA,
973 SII902X_SYS_CTRL_DDC_BUS_REQ,
974 SII902X_SYS_CTRL_DDC_BUS_REQ);
975 if (ret)
976 return ret;
977
978 timeout = jiffies +
979 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
980 do {
981 ret = sii902x_read_unlocked(i2c: sii902x->i2c, SII902X_SYS_CTRL_DATA,
982 val: &status);
983 if (ret)
984 return ret;
985 } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
986 time_before(jiffies, timeout));
987
988 if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
989 dev_err(dev, "Failed to acquire the i2c bus\n");
990 return -ETIMEDOUT;
991 }
992
993 return sii902x_write_unlocked(i2c: sii902x->i2c, SII902X_SYS_CTRL_DATA,
994 val: status);
995}
996
997/*
998 * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
999 * mode of the HDMI transmitter. Do not use regmap from within this function,
1000 * only use sii902x_*_unlocked functions to read/modify/write registers.
1001 * We are holding the parent adapter lock here, keep this in mind before
1002 * adding more i2c transactions.
1003 *
1004 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
1005 * in this driver, we need to make sure that we only touch 0x1A[2:1] from
1006 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
1007 * we leave the remaining bits as we have found them.
1008 */
1009static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
1010{
1011 struct sii902x *sii902x = i2c_mux_priv(muxc: mux);
1012 struct device *dev = &sii902x->i2c->dev;
1013 unsigned long timeout;
1014 unsigned int retries;
1015 u8 status;
1016 int ret;
1017
1018 /*
1019 * When the HDMI transmitter is in pass through mode, we need an
1020 * (undocumented) additional delay between STOP and START conditions
1021 * to guarantee the bus won't get stuck.
1022 */
1023 udelay(usec: 30);
1024
1025 /*
1026 * Sometimes the I2C bus can stall after failure to use the
1027 * EDID channel. Retry a few times to see if things clear
1028 * up, else continue anyway.
1029 */
1030 retries = 5;
1031 do {
1032 ret = sii902x_read_unlocked(i2c: sii902x->i2c, SII902X_SYS_CTRL_DATA,
1033 val: &status);
1034 retries--;
1035 } while (ret && retries);
1036 if (ret) {
1037 dev_err(dev, "failed to read status (%d)\n", ret);
1038 return ret;
1039 }
1040
1041 ret = sii902x_update_bits_unlocked(i2c: sii902x->i2c, SII902X_SYS_CTRL_DATA,
1042 SII902X_SYS_CTRL_DDC_BUS_REQ |
1043 SII902X_SYS_CTRL_DDC_BUS_GRTD, val: 0);
1044 if (ret)
1045 return ret;
1046
1047 timeout = jiffies +
1048 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
1049 do {
1050 ret = sii902x_read_unlocked(i2c: sii902x->i2c, SII902X_SYS_CTRL_DATA,
1051 val: &status);
1052 if (ret)
1053 return ret;
1054 } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
1055 SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
1056 time_before(jiffies, timeout));
1057
1058 if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
1059 SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
1060 dev_err(dev, "failed to release the i2c bus\n");
1061 return -ETIMEDOUT;
1062 }
1063
1064 return 0;
1065}
1066
1067static const struct drm_bridge_timings default_sii902x_timings = {
1068 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
1069 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
1070 | DRM_BUS_FLAG_DE_HIGH,
1071};
1072
1073static int sii902x_init(struct sii902x *sii902x)
1074{
1075 struct device *dev = &sii902x->i2c->dev;
1076 unsigned int status = 0;
1077 u8 chipid[4];
1078 int ret;
1079
1080 sii902x_reset(sii902x);
1081
1082 ret = regmap_write(map: sii902x->regmap, SII902X_REG_TPI_RQB, val: 0x0);
1083 if (ret)
1084 return ret;
1085
1086 ret = regmap_bulk_read(map: sii902x->regmap, SII902X_REG_CHIPID(0),
1087 val: &chipid, val_count: 4);
1088 if (ret) {
1089 dev_err(dev, "regmap_read failed %d\n", ret);
1090 return ret;
1091 }
1092
1093 if (chipid[0] != 0xb0) {
1094 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
1095 chipid[0]);
1096 return -EINVAL;
1097 }
1098
1099 /* Clear all pending interrupts */
1100 regmap_read(map: sii902x->regmap, SII902X_INT_STATUS, val: &status);
1101 regmap_write(map: sii902x->regmap, SII902X_INT_STATUS, val: status);
1102
1103 if (sii902x->i2c->irq > 0) {
1104 regmap_write(map: sii902x->regmap, SII902X_INT_ENABLE,
1105 SII902X_HOTPLUG_EVENT);
1106
1107 ret = devm_request_threaded_irq(dev, irq: sii902x->i2c->irq, NULL,
1108 thread_fn: sii902x_interrupt,
1109 IRQF_ONESHOT, devname: dev_name(dev),
1110 dev_id: sii902x);
1111 if (ret)
1112 return ret;
1113 }
1114
1115 ret = sii902x_audio_codec_init(sii902x, dev);
1116 if (ret)
1117 return ret;
1118
1119 i2c_set_clientdata(client: sii902x->i2c, data: sii902x);
1120
1121 sii902x->i2cmux = i2c_mux_alloc(parent: sii902x->i2c->adapter, dev,
1122 max_adapters: 1, sizeof_priv: 0, I2C_MUX_GATE,
1123 select: sii902x_i2c_bypass_select,
1124 deselect: sii902x_i2c_bypass_deselect);
1125 if (!sii902x->i2cmux) {
1126 ret = -ENOMEM;
1127 goto err_unreg_audio;
1128 }
1129
1130 sii902x->i2cmux->priv = sii902x;
1131 ret = i2c_mux_add_adapter(muxc: sii902x->i2cmux, force_nr: 0, chan_id: 0);
1132 if (ret)
1133 goto err_unreg_audio;
1134
1135 sii902x->bridge.of_node = dev->of_node;
1136 sii902x->bridge.timings = &default_sii902x_timings;
1137 sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
1138 sii902x->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
1139
1140 if (sii902x->i2c->irq > 0)
1141 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD;
1142
1143 drm_bridge_add(bridge: &sii902x->bridge);
1144
1145 return 0;
1146
1147err_unreg_audio:
1148 if (!PTR_ERR_OR_ZERO(ptr: sii902x->audio.pdev))
1149 platform_device_unregister(sii902x->audio.pdev);
1150
1151 return ret;
1152}
1153
1154static int sii902x_probe(struct i2c_client *client)
1155{
1156 struct device *dev = &client->dev;
1157 struct device_node *endpoint;
1158 struct sii902x *sii902x;
1159 static const char * const supplies[] = {"iovcc", "cvcc12"};
1160 int ret;
1161
1162 ret = i2c_check_functionality(adap: client->adapter,
1163 I2C_FUNC_SMBUS_BYTE_DATA);
1164 if (!ret) {
1165 dev_err(dev, "I2C adapter not suitable\n");
1166 return -EIO;
1167 }
1168
1169 sii902x = devm_drm_bridge_alloc(dev, struct sii902x, bridge, &sii902x_bridge_funcs);
1170 if (IS_ERR(ptr: sii902x))
1171 return PTR_ERR(ptr: sii902x);
1172
1173 sii902x->i2c = client;
1174 sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
1175 if (IS_ERR(ptr: sii902x->regmap))
1176 return PTR_ERR(ptr: sii902x->regmap);
1177
1178 sii902x->reset_gpio = devm_gpiod_get_optional(dev, con_id: "reset",
1179 flags: GPIOD_OUT_LOW);
1180 if (IS_ERR(ptr: sii902x->reset_gpio)) {
1181 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
1182 PTR_ERR(sii902x->reset_gpio));
1183 return PTR_ERR(ptr: sii902x->reset_gpio);
1184 }
1185
1186 sii902x->bus_width = 24;
1187 endpoint = of_graph_get_endpoint_by_regs(parent: dev->of_node, port_reg: 0, reg: -1);
1188 if (endpoint)
1189 of_property_read_u32(np: endpoint, propname: "bus-width", out_value: &sii902x->bus_width);
1190
1191 endpoint = of_graph_get_endpoint_by_regs(parent: dev->of_node, port_reg: 1, reg: -1);
1192 if (endpoint) {
1193 struct device_node *remote = of_graph_get_remote_port_parent(node: endpoint);
1194
1195 of_node_put(node: endpoint);
1196 if (!remote) {
1197 dev_err(dev, "Endpoint in port@1 unconnected\n");
1198 return -ENODEV;
1199 }
1200
1201 if (!of_device_is_available(device: remote)) {
1202 dev_err(dev, "port@1 remote device is disabled\n");
1203 of_node_put(node: remote);
1204 return -ENODEV;
1205 }
1206
1207 sii902x->next_bridge = of_drm_find_bridge(np: remote);
1208 of_node_put(node: remote);
1209 if (!sii902x->next_bridge)
1210 return dev_err_probe(dev, err: -EPROBE_DEFER,
1211 fmt: "Failed to find remote bridge\n");
1212 }
1213
1214 mutex_init(&sii902x->mutex);
1215
1216 ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), id: supplies);
1217 if (ret < 0)
1218 return dev_err_probe(dev, err: ret, fmt: "Failed to enable supplies");
1219
1220 return sii902x_init(sii902x);
1221}
1222
1223static void sii902x_remove(struct i2c_client *client)
1224{
1225 struct sii902x *sii902x = i2c_get_clientdata(client);
1226
1227 drm_bridge_remove(bridge: &sii902x->bridge);
1228 i2c_mux_del_adapters(muxc: sii902x->i2cmux);
1229
1230 if (!PTR_ERR_OR_ZERO(ptr: sii902x->audio.pdev))
1231 platform_device_unregister(sii902x->audio.pdev);
1232}
1233
1234static const struct of_device_id sii902x_dt_ids[] = {
1235 { .compatible = "sil,sii9022", },
1236 { }
1237};
1238MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1239
1240static const struct i2c_device_id sii902x_i2c_ids[] = {
1241 { "sii9022" },
1242 { }
1243};
1244MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1245
1246static struct i2c_driver sii902x_driver = {
1247 .probe = sii902x_probe,
1248 .remove = sii902x_remove,
1249 .driver = {
1250 .name = "sii902x",
1251 .of_match_table = sii902x_dt_ids,
1252 },
1253 .id_table = sii902x_i2c_ids,
1254};
1255module_i2c_driver(sii902x_driver);
1256
1257MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
1258MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1259MODULE_LICENSE("GPL");
1260

source code of linux/drivers/gpu/drm/bridge/sii902x.c