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