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
174 struct 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 bool sink_is_hdmi;
183 u32 bus_width;
184
185 /*
186 * Mutex protects audio and video functions from interfering
187 * each other, by keeping their i2c command sequences atomic.
188 */
189 struct mutex mutex;
190 struct sii902x_audio {
191 struct platform_device *pdev;
192 struct clk *mclk;
193 u32 i2s_fifo_sequence[4];
194 } audio;
195 };
196
sii902x_read_unlocked(struct i2c_client * i2c,u8 reg,u8 * val)197 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
198 {
199 union i2c_smbus_data data;
200 int ret;
201
202 ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
203 I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
204
205 if (ret < 0)
206 return ret;
207
208 *val = data.byte;
209 return 0;
210 }
211
sii902x_write_unlocked(struct i2c_client * i2c,u8 reg,u8 val)212 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
213 {
214 union i2c_smbus_data data;
215
216 data.byte = val;
217
218 return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
219 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
220 &data);
221 }
222
sii902x_update_bits_unlocked(struct i2c_client * i2c,u8 reg,u8 mask,u8 val)223 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
224 u8 val)
225 {
226 int ret;
227 u8 status;
228
229 ret = sii902x_read_unlocked(i2c, reg, &status);
230 if (ret)
231 return ret;
232 status &= ~mask;
233 status |= val & mask;
234 return sii902x_write_unlocked(i2c, reg, status);
235 }
236
bridge_to_sii902x(struct drm_bridge * bridge)237 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
238 {
239 return container_of(bridge, struct sii902x, bridge);
240 }
241
connector_to_sii902x(struct drm_connector * con)242 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
243 {
244 return container_of(con, struct sii902x, connector);
245 }
246
sii902x_reset(struct sii902x * sii902x)247 static void sii902x_reset(struct sii902x *sii902x)
248 {
249 if (!sii902x->reset_gpio)
250 return;
251
252 gpiod_set_value_cansleep(sii902x->reset_gpio, 1);
253
254 /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
255 usleep_range(150, 200);
256
257 gpiod_set_value_cansleep(sii902x->reset_gpio, 0);
258 }
259
sii902x_detect(struct sii902x * sii902x)260 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)
261 {
262 unsigned int status;
263
264 mutex_lock(&sii902x->mutex);
265
266 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
267
268 mutex_unlock(&sii902x->mutex);
269
270 return (status & SII902X_PLUGGED_STATUS) ?
271 connector_status_connected : connector_status_disconnected;
272 }
273
274 static enum drm_connector_status
sii902x_connector_detect(struct drm_connector * connector,bool force)275 sii902x_connector_detect(struct drm_connector *connector, bool force)
276 {
277 struct sii902x *sii902x = connector_to_sii902x(connector);
278
279 return sii902x_detect(sii902x);
280 }
281
282 static const struct drm_connector_funcs sii902x_connector_funcs = {
283 .detect = sii902x_connector_detect,
284 .fill_modes = drm_helper_probe_single_connector_modes,
285 .destroy = drm_connector_cleanup,
286 .reset = drm_atomic_helper_connector_reset,
287 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
288 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
289 };
290
sii902x_edid_read(struct sii902x * sii902x,struct drm_connector * connector)291 static const struct drm_edid *sii902x_edid_read(struct sii902x *sii902x,
292 struct drm_connector *connector)
293 {
294 const struct drm_edid *drm_edid;
295
296 mutex_lock(&sii902x->mutex);
297
298 drm_edid = drm_edid_read_ddc(connector, sii902x->i2cmux->adapter[0]);
299
300 mutex_unlock(&sii902x->mutex);
301
302 return drm_edid;
303 }
304
sii902x_get_modes(struct drm_connector * connector)305 static int sii902x_get_modes(struct drm_connector *connector)
306 {
307 struct sii902x *sii902x = connector_to_sii902x(connector);
308 const struct drm_edid *drm_edid;
309 int num = 0;
310
311 drm_edid = sii902x_edid_read(sii902x, connector);
312 drm_edid_connector_update(connector, drm_edid);
313 if (drm_edid) {
314 num = drm_edid_connector_add_modes(connector);
315 drm_edid_free(drm_edid);
316 }
317
318 sii902x->sink_is_hdmi = connector->display_info.is_hdmi;
319
320 return num;
321 }
322
323 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
324 .get_modes = sii902x_get_modes,
325 };
326
sii902x_bridge_atomic_disable(struct drm_bridge * bridge,struct drm_atomic_state * state)327 static void sii902x_bridge_atomic_disable(struct drm_bridge *bridge,
328 struct drm_atomic_state *state)
329 {
330 struct sii902x *sii902x = bridge_to_sii902x(bridge);
331
332 mutex_lock(&sii902x->mutex);
333
334 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
335 SII902X_SYS_CTRL_PWR_DWN,
336 SII902X_SYS_CTRL_PWR_DWN);
337
338 mutex_unlock(&sii902x->mutex);
339 }
340
sii902x_bridge_atomic_enable(struct drm_bridge * bridge,struct drm_atomic_state * state)341 static void sii902x_bridge_atomic_enable(struct drm_bridge *bridge,
342 struct drm_atomic_state *state)
343 {
344 struct sii902x *sii902x = bridge_to_sii902x(bridge);
345
346 mutex_lock(&sii902x->mutex);
347
348 regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
349 SII902X_AVI_POWER_STATE_MSK,
350 SII902X_AVI_POWER_STATE_D(0));
351 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
352 SII902X_SYS_CTRL_PWR_DWN, 0);
353
354 mutex_unlock(&sii902x->mutex);
355 }
356
sii902x_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adj)357 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
358 const struct drm_display_mode *mode,
359 const struct drm_display_mode *adj)
360 {
361 struct sii902x *sii902x = bridge_to_sii902x(bridge);
362 u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
363 struct regmap *regmap = sii902x->regmap;
364 u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
365 struct hdmi_avi_infoframe frame;
366 u16 pixel_clock_10kHz = adj->clock / 10;
367 int ret;
368
369 if (sii902x->sink_is_hdmi)
370 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
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_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
388 SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
389 if (ret)
390 goto out;
391
392 ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
393 if (ret)
394 goto out;
395
396 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
397 &sii902x->connector, adj);
398 if (ret < 0) {
399 DRM_ERROR("couldn't fill AVI infoframe\n");
400 goto out;
401 }
402
403 ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
404 if (ret < 0) {
405 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
406 goto out;
407 }
408
409 /* Do not send the infoframe header, but keep the CRC field. */
410 regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
411 buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
412 HDMI_AVI_INFOFRAME_SIZE + 1);
413
414 out:
415 mutex_unlock(&sii902x->mutex);
416 }
417
sii902x_bridge_attach(struct drm_bridge * bridge,struct drm_encoder * encoder,enum drm_bridge_attach_flags flags)418 static int sii902x_bridge_attach(struct drm_bridge *bridge,
419 struct drm_encoder *encoder,
420 enum drm_bridge_attach_flags flags)
421 {
422 struct sii902x *sii902x = bridge_to_sii902x(bridge);
423 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
424 struct drm_device *drm = bridge->dev;
425 int ret;
426
427 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
428 return drm_bridge_attach(encoder, sii902x->next_bridge,
429 bridge, flags);
430
431 drm_connector_helper_add(&sii902x->connector,
432 &sii902x_connector_helper_funcs);
433
434 if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
435 dev_err(&sii902x->i2c->dev,
436 "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
437 return -ENOTSUPP;
438 }
439
440 ret = drm_connector_init(drm, &sii902x->connector,
441 &sii902x_connector_funcs,
442 DRM_MODE_CONNECTOR_HDMIA);
443 if (ret)
444 return ret;
445
446 if (sii902x->i2c->irq > 0)
447 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
448 else
449 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
450
451 ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info,
452 &bus_format, 1);
453 if (ret)
454 return ret;
455
456 drm_connector_attach_encoder(&sii902x->connector, encoder);
457
458 return 0;
459 }
460
461 static enum drm_connector_status
sii902x_bridge_detect(struct drm_bridge * bridge,struct drm_connector * connector)462 sii902x_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector)
463 {
464 struct sii902x *sii902x = bridge_to_sii902x(bridge);
465
466 return sii902x_detect(sii902x);
467 }
468
sii902x_bridge_edid_read(struct drm_bridge * bridge,struct drm_connector * connector)469 static const struct drm_edid *sii902x_bridge_edid_read(struct drm_bridge *bridge,
470 struct drm_connector *connector)
471 {
472 struct sii902x *sii902x = bridge_to_sii902x(bridge);
473
474 return sii902x_edid_read(sii902x, connector);
475 }
476
sii902x_bridge_atomic_get_input_bus_fmts(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state,u32 output_fmt,unsigned int * num_input_fmts)477 static u32 *sii902x_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
478 struct drm_bridge_state *bridge_state,
479 struct drm_crtc_state *crtc_state,
480 struct drm_connector_state *conn_state,
481 u32 output_fmt,
482 unsigned int *num_input_fmts)
483 {
484
485 struct sii902x *sii902x = bridge_to_sii902x(bridge);
486 u32 *input_fmts;
487
488 *num_input_fmts = 0;
489
490 input_fmts = kcalloc(1, sizeof(*input_fmts), GFP_KERNEL);
491 if (!input_fmts)
492 return NULL;
493
494 switch (sii902x->bus_width) {
495 case 16:
496 input_fmts[0] = MEDIA_BUS_FMT_RGB565_1X16;
497 break;
498 case 18:
499 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X18;
500 break;
501 case 24:
502 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
503 break;
504 default:
505 return NULL;
506 }
507
508 *num_input_fmts = 1;
509
510 return input_fmts;
511 }
512
sii902x_bridge_atomic_check(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)513 static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
514 struct drm_bridge_state *bridge_state,
515 struct drm_crtc_state *crtc_state,
516 struct drm_connector_state *conn_state)
517 {
518 if (crtc_state->mode.clock < SII902X_MIN_PIXEL_CLOCK_KHZ ||
519 crtc_state->mode.clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
520 return -EINVAL;
521
522 /*
523 * There might be flags negotiation supported in future but
524 * set the bus flags in atomic_check statically for now.
525 */
526 bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags;
527
528 return 0;
529 }
530
531 static enum drm_mode_status
sii902x_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)532 sii902x_bridge_mode_valid(struct drm_bridge *bridge,
533 const struct drm_display_info *info,
534 const struct drm_display_mode *mode)
535 {
536 if (mode->clock < SII902X_MIN_PIXEL_CLOCK_KHZ)
537 return MODE_CLOCK_LOW;
538
539 if (mode->clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
540 return MODE_CLOCK_HIGH;
541
542 return MODE_OK;
543 }
544
545 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
546 .attach = sii902x_bridge_attach,
547 .mode_set = sii902x_bridge_mode_set,
548 .atomic_disable = sii902x_bridge_atomic_disable,
549 .atomic_enable = sii902x_bridge_atomic_enable,
550 .detect = sii902x_bridge_detect,
551 .edid_read = sii902x_bridge_edid_read,
552 .atomic_reset = drm_atomic_helper_bridge_reset,
553 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
554 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
555 .atomic_get_input_bus_fmts = sii902x_bridge_atomic_get_input_bus_fmts,
556 .atomic_check = sii902x_bridge_atomic_check,
557 .mode_valid = sii902x_bridge_mode_valid,
558 };
559
sii902x_mute(struct sii902x * sii902x,bool mute)560 static int sii902x_mute(struct sii902x *sii902x, bool mute)
561 {
562 struct device *dev = &sii902x->i2c->dev;
563 unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
564 SII902X_TPI_AUDIO_MUTE_DISABLE;
565
566 dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
567
568 return regmap_update_bits(sii902x->regmap,
569 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
570 SII902X_TPI_AUDIO_MUTE_ENABLE, val);
571 }
572
573 static const int sii902x_mclk_div_table[] = {
574 128, 256, 384, 512, 768, 1024, 1152, 192 };
575
sii902x_select_mclk_div(u8 * i2s_config_reg,unsigned int rate,unsigned int mclk)576 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
577 unsigned int mclk)
578 {
579 int div = mclk / rate;
580 int distance = 100000;
581 u8 i, nearest = 0;
582
583 for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
584 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
585
586 if (d >= distance)
587 continue;
588
589 nearest = i;
590 distance = d;
591 if (d == 0)
592 break;
593 }
594
595 *i2s_config_reg |= nearest << 4;
596
597 return sii902x_mclk_div_table[nearest];
598 }
599
600 static const struct sii902x_sample_freq {
601 u32 freq;
602 u8 val;
603 } sii902x_sample_freq[] = {
604 { .freq = 32000, .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
605 { .freq = 44000, .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
606 { .freq = 48000, .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
607 { .freq = 88000, .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
608 { .freq = 96000, .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
609 { .freq = 176000, .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
610 { .freq = 192000, .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
611 };
612
sii902x_audio_hw_params(struct device * dev,void * data,struct hdmi_codec_daifmt * daifmt,struct hdmi_codec_params * params)613 static int sii902x_audio_hw_params(struct device *dev, void *data,
614 struct hdmi_codec_daifmt *daifmt,
615 struct hdmi_codec_params *params)
616 {
617 struct sii902x *sii902x = dev_get_drvdata(dev);
618 u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
619 u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
620 SII902X_TPI_AUDIO_MUTE_ENABLE |
621 SII902X_TPI_AUDIO_CODING_PCM);
622 u8 config_byte3_reg = 0;
623 u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
624 unsigned long mclk_rate;
625 int i, ret;
626
627 if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) {
628 dev_dbg(dev, "%s: I2S clock provider mode not supported\n",
629 __func__);
630 return -EINVAL;
631 }
632
633 switch (daifmt->fmt) {
634 case HDMI_I2S:
635 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
636 SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
637 break;
638 case HDMI_RIGHT_J:
639 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
640 break;
641 case HDMI_LEFT_J:
642 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
643 break;
644 default:
645 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
646 daifmt->fmt);
647 return -EINVAL;
648 }
649
650 if (daifmt->bit_clk_inv)
651 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
652 else
653 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
654
655 if (daifmt->frame_clk_inv)
656 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
657 else
658 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
659
660 if (params->channels > 2)
661 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
662 else
663 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
664
665 switch (params->sample_width) {
666 case 16:
667 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
668 break;
669 case 20:
670 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
671 break;
672 case 24:
673 case 32:
674 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
675 break;
676 default:
677 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
678 params->sample_width);
679 return -EINVAL;
680 }
681
682 for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
683 if (params->sample_rate == sii902x_sample_freq[i].freq) {
684 config_byte3_reg |= sii902x_sample_freq[i].val;
685 break;
686 }
687 }
688
689 ret = clk_prepare_enable(sii902x->audio.mclk);
690 if (ret) {
691 dev_err(dev, "Enabling mclk failed: %d\n", ret);
692 return ret;
693 }
694
695 if (sii902x->audio.mclk) {
696 mclk_rate = clk_get_rate(sii902x->audio.mclk);
697 ret = sii902x_select_mclk_div(&i2s_config_reg,
698 params->sample_rate, mclk_rate);
699 if (mclk_rate != ret * params->sample_rate)
700 dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
701 mclk_rate, ret, params->sample_rate);
702 }
703
704 mutex_lock(&sii902x->mutex);
705
706 ret = regmap_write(sii902x->regmap,
707 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
708 config_byte2_reg);
709 if (ret < 0)
710 goto out;
711
712 ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
713 i2s_config_reg);
714 if (ret)
715 goto out;
716
717 for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
718 sii902x->audio.i2s_fifo_sequence[i]; i++)
719 regmap_write(sii902x->regmap,
720 SII902X_TPI_I2S_ENABLE_MAPPING_REG,
721 sii902x->audio.i2s_fifo_sequence[i]);
722
723 ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
724 config_byte3_reg);
725 if (ret)
726 goto out;
727
728 ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
729 params->iec.status,
730 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
731 sizeof(params->iec.status)));
732 if (ret)
733 goto out;
734
735 ret = hdmi_audio_infoframe_pack(¶ms->cea, infoframe_buf,
736 sizeof(infoframe_buf));
737 if (ret < 0) {
738 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
739 __func__, ret);
740 goto out;
741 }
742
743 ret = regmap_bulk_write(sii902x->regmap,
744 SII902X_TPI_MISC_INFOFRAME_BASE,
745 infoframe_buf,
746 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
747 if (ret)
748 goto out;
749
750 /* Decode Level 0 Packets */
751 ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
752 if (ret)
753 goto out;
754
755 ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
756 if (ret)
757 goto out;
758
759 ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
760 if (ret)
761 goto out;
762
763 dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
764 out:
765 mutex_unlock(&sii902x->mutex);
766
767 if (ret) {
768 clk_disable_unprepare(sii902x->audio.mclk);
769 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
770 ret);
771 }
772
773 return ret;
774 }
775
sii902x_audio_shutdown(struct device * dev,void * data)776 static void sii902x_audio_shutdown(struct device *dev, void *data)
777 {
778 struct sii902x *sii902x = dev_get_drvdata(dev);
779
780 mutex_lock(&sii902x->mutex);
781
782 regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
783 SII902X_TPI_AUDIO_INTERFACE_DISABLE);
784
785 mutex_unlock(&sii902x->mutex);
786
787 clk_disable_unprepare(sii902x->audio.mclk);
788 }
789
sii902x_audio_mute(struct device * dev,void * data,bool enable,int direction)790 static int sii902x_audio_mute(struct device *dev, void *data,
791 bool enable, int direction)
792 {
793 struct sii902x *sii902x = dev_get_drvdata(dev);
794
795 mutex_lock(&sii902x->mutex);
796
797 sii902x_mute(sii902x, enable);
798
799 mutex_unlock(&sii902x->mutex);
800
801 return 0;
802 }
803
sii902x_audio_get_eld(struct device * dev,void * data,uint8_t * buf,size_t len)804 static int sii902x_audio_get_eld(struct device *dev, void *data,
805 uint8_t *buf, size_t len)
806 {
807 struct sii902x *sii902x = dev_get_drvdata(dev);
808
809 mutex_lock(&sii902x->mutex);
810
811 memcpy(buf, sii902x->connector.eld,
812 min(sizeof(sii902x->connector.eld), len));
813
814 mutex_unlock(&sii902x->mutex);
815
816 return 0;
817 }
818
sii902x_audio_get_dai_id(struct snd_soc_component * component,struct device_node * endpoint,void * data)819 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
820 struct device_node *endpoint,
821 void *data)
822 {
823 struct of_endpoint of_ep;
824 int ret;
825
826 ret = of_graph_parse_endpoint(endpoint, &of_ep);
827 if (ret < 0)
828 return ret;
829
830 /*
831 * HDMI sound should be located at reg = <3>
832 * Return expected DAI index 0.
833 */
834 if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
835 return 0;
836
837 return -EINVAL;
838 }
839
840 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
841 .hw_params = sii902x_audio_hw_params,
842 .audio_shutdown = sii902x_audio_shutdown,
843 .mute_stream = sii902x_audio_mute,
844 .get_eld = sii902x_audio_get_eld,
845 .get_dai_id = sii902x_audio_get_dai_id,
846 };
847
sii902x_audio_codec_init(struct sii902x * sii902x,struct device * dev)848 static int sii902x_audio_codec_init(struct sii902x *sii902x,
849 struct device *dev)
850 {
851 static const u8 audio_fifo_id[] = {
852 SII902X_TPI_I2S_CONFIG_FIFO0,
853 SII902X_TPI_I2S_CONFIG_FIFO1,
854 SII902X_TPI_I2S_CONFIG_FIFO2,
855 SII902X_TPI_I2S_CONFIG_FIFO3,
856 };
857 static const u8 i2s_lane_id[] = {
858 SII902X_TPI_I2S_SELECT_SD0,
859 SII902X_TPI_I2S_SELECT_SD1,
860 SII902X_TPI_I2S_SELECT_SD2,
861 SII902X_TPI_I2S_SELECT_SD3,
862 };
863 struct hdmi_codec_pdata codec_data = {
864 .ops = &sii902x_audio_codec_ops,
865 .i2s = 1, /* Only i2s support for now. */
866 .spdif = 0,
867 .max_i2s_channels = 0,
868 .no_capture_mute = 1,
869 };
870 u8 lanes[4];
871 int num_lanes, i;
872
873 if (!of_property_present(dev->of_node, "#sound-dai-cells")) {
874 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
875 __func__);
876 return 0;
877 }
878
879 num_lanes = of_property_read_variable_u8_array(dev->of_node,
880 "sil,i2s-data-lanes",
881 lanes, 1,
882 ARRAY_SIZE(lanes));
883
884 if (num_lanes == -EINVAL) {
885 dev_dbg(dev,
886 "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
887 __func__);
888 num_lanes = 1;
889 lanes[0] = 0;
890 } else if (num_lanes < 0) {
891 dev_err(dev,
892 "%s: Error getting \"sil,i2s-data-lanes\": %d\n",
893 __func__, num_lanes);
894 return num_lanes;
895 }
896 codec_data.max_i2s_channels = 2 * num_lanes;
897
898 for (i = 0; i < num_lanes; i++)
899 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
900 i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
901
902 sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
903 if (IS_ERR(sii902x->audio.mclk)) {
904 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
905 __func__, PTR_ERR(sii902x->audio.mclk));
906 return PTR_ERR(sii902x->audio.mclk);
907 }
908
909 sii902x->audio.pdev = platform_device_register_data(
910 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
911 &codec_data, sizeof(codec_data));
912
913 return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
914 }
915
916 static const struct regmap_range sii902x_volatile_ranges[] = {
917 { .range_min = 0, .range_max = 0xff },
918 };
919
920 static const struct regmap_access_table sii902x_volatile_table = {
921 .yes_ranges = sii902x_volatile_ranges,
922 .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
923 };
924
925 static const struct regmap_config sii902x_regmap_config = {
926 .reg_bits = 8,
927 .val_bits = 8,
928 .disable_locking = true, /* struct sii902x mutex should be enough */
929 .max_register = SII902X_TPI_MISC_INFOFRAME_END,
930 .volatile_table = &sii902x_volatile_table,
931 .cache_type = REGCACHE_NONE,
932 };
933
sii902x_interrupt(int irq,void * data)934 static irqreturn_t sii902x_interrupt(int irq, void *data)
935 {
936 struct sii902x *sii902x = data;
937 unsigned int status = 0;
938
939 mutex_lock(&sii902x->mutex);
940
941 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
942 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
943
944 mutex_unlock(&sii902x->mutex);
945
946 if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {
947 drm_helper_hpd_irq_event(sii902x->bridge.dev);
948 drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS)
949 ? connector_status_connected
950 : connector_status_disconnected);
951 }
952
953 return IRQ_HANDLED;
954 }
955
956 /*
957 * The purpose of sii902x_i2c_bypass_select is to enable the pass through
958 * mode of the HDMI transmitter. Do not use regmap from within this function,
959 * only use sii902x_*_unlocked functions to read/modify/write registers.
960 * We are holding the parent adapter lock here, keep this in mind before
961 * adding more i2c transactions.
962 *
963 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
964 * in this driver, we need to make sure that we only touch 0x1A[2:1] from
965 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
966 * we leave the remaining bits as we have found them.
967 */
sii902x_i2c_bypass_select(struct i2c_mux_core * mux,u32 chan_id)968 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
969 {
970 struct sii902x *sii902x = i2c_mux_priv(mux);
971 struct device *dev = &sii902x->i2c->dev;
972 unsigned long timeout;
973 u8 status;
974 int ret;
975
976 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
977 SII902X_SYS_CTRL_DDC_BUS_REQ,
978 SII902X_SYS_CTRL_DDC_BUS_REQ);
979 if (ret)
980 return ret;
981
982 timeout = jiffies +
983 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
984 do {
985 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
986 &status);
987 if (ret)
988 return ret;
989 } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
990 time_before(jiffies, timeout));
991
992 if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
993 dev_err(dev, "Failed to acquire the i2c bus\n");
994 return -ETIMEDOUT;
995 }
996
997 return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
998 status);
999 }
1000
1001 /*
1002 * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
1003 * mode of the HDMI transmitter. Do not use regmap from within this function,
1004 * only use sii902x_*_unlocked functions to read/modify/write registers.
1005 * We are holding the parent adapter lock here, keep this in mind before
1006 * adding more i2c transactions.
1007 *
1008 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
1009 * in this driver, we need to make sure that we only touch 0x1A[2:1] from
1010 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
1011 * we leave the remaining bits as we have found them.
1012 */
sii902x_i2c_bypass_deselect(struct i2c_mux_core * mux,u32 chan_id)1013 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
1014 {
1015 struct sii902x *sii902x = i2c_mux_priv(mux);
1016 struct device *dev = &sii902x->i2c->dev;
1017 unsigned long timeout;
1018 unsigned int retries;
1019 u8 status;
1020 int ret;
1021
1022 /*
1023 * When the HDMI transmitter is in pass through mode, we need an
1024 * (undocumented) additional delay between STOP and START conditions
1025 * to guarantee the bus won't get stuck.
1026 */
1027 udelay(30);
1028
1029 /*
1030 * Sometimes the I2C bus can stall after failure to use the
1031 * EDID channel. Retry a few times to see if things clear
1032 * up, else continue anyway.
1033 */
1034 retries = 5;
1035 do {
1036 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1037 &status);
1038 retries--;
1039 } while (ret && retries);
1040 if (ret) {
1041 dev_err(dev, "failed to read status (%d)\n", ret);
1042 return ret;
1043 }
1044
1045 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1046 SII902X_SYS_CTRL_DDC_BUS_REQ |
1047 SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
1048 if (ret)
1049 return ret;
1050
1051 timeout = jiffies +
1052 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
1053 do {
1054 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1055 &status);
1056 if (ret)
1057 return ret;
1058 } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
1059 SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
1060 time_before(jiffies, timeout));
1061
1062 if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
1063 SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
1064 dev_err(dev, "failed to release the i2c bus\n");
1065 return -ETIMEDOUT;
1066 }
1067
1068 return 0;
1069 }
1070
1071 static const struct drm_bridge_timings default_sii902x_timings = {
1072 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
1073 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
1074 | DRM_BUS_FLAG_DE_HIGH,
1075 };
1076
sii902x_init(struct sii902x * sii902x)1077 static int sii902x_init(struct sii902x *sii902x)
1078 {
1079 struct device *dev = &sii902x->i2c->dev;
1080 unsigned int status = 0;
1081 u8 chipid[4];
1082 int ret;
1083
1084 sii902x_reset(sii902x);
1085
1086 ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
1087 if (ret)
1088 return ret;
1089
1090 ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
1091 &chipid, 4);
1092 if (ret) {
1093 dev_err(dev, "regmap_read failed %d\n", ret);
1094 return ret;
1095 }
1096
1097 if (chipid[0] != 0xb0) {
1098 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
1099 chipid[0]);
1100 return -EINVAL;
1101 }
1102
1103 /* Clear all pending interrupts */
1104 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
1105 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
1106
1107 if (sii902x->i2c->irq > 0) {
1108 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
1109 SII902X_HOTPLUG_EVENT);
1110
1111 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL,
1112 sii902x_interrupt,
1113 IRQF_ONESHOT, dev_name(dev),
1114 sii902x);
1115 if (ret)
1116 return ret;
1117 }
1118
1119 ret = sii902x_audio_codec_init(sii902x, dev);
1120 if (ret)
1121 return ret;
1122
1123 i2c_set_clientdata(sii902x->i2c, sii902x);
1124
1125 sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev,
1126 1, 0, I2C_MUX_GATE,
1127 sii902x_i2c_bypass_select,
1128 sii902x_i2c_bypass_deselect);
1129 if (!sii902x->i2cmux) {
1130 ret = -ENOMEM;
1131 goto err_unreg_audio;
1132 }
1133
1134 sii902x->i2cmux->priv = sii902x;
1135 ret = i2c_mux_add_adapter(sii902x->i2cmux, 0, 0);
1136 if (ret)
1137 goto err_unreg_audio;
1138
1139 sii902x->bridge.of_node = dev->of_node;
1140 sii902x->bridge.timings = &default_sii902x_timings;
1141 sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
1142 sii902x->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
1143
1144 if (sii902x->i2c->irq > 0)
1145 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD;
1146
1147 drm_bridge_add(&sii902x->bridge);
1148
1149 return 0;
1150
1151 err_unreg_audio:
1152 if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev))
1153 platform_device_unregister(sii902x->audio.pdev);
1154
1155 return ret;
1156 }
1157
sii902x_probe(struct i2c_client * client)1158 static int sii902x_probe(struct i2c_client *client)
1159 {
1160 struct device *dev = &client->dev;
1161 struct device_node *endpoint;
1162 struct sii902x *sii902x;
1163 static const char * const supplies[] = {"iovcc", "cvcc12"};
1164 int ret;
1165
1166 ret = i2c_check_functionality(client->adapter,
1167 I2C_FUNC_SMBUS_BYTE_DATA);
1168 if (!ret) {
1169 dev_err(dev, "I2C adapter not suitable\n");
1170 return -EIO;
1171 }
1172
1173 sii902x = devm_drm_bridge_alloc(dev, struct sii902x, bridge, &sii902x_bridge_funcs);
1174 if (IS_ERR(sii902x))
1175 return PTR_ERR(sii902x);
1176
1177 sii902x->i2c = client;
1178 sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
1179 if (IS_ERR(sii902x->regmap))
1180 return PTR_ERR(sii902x->regmap);
1181
1182 sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1183 GPIOD_OUT_LOW);
1184 if (IS_ERR(sii902x->reset_gpio)) {
1185 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
1186 PTR_ERR(sii902x->reset_gpio));
1187 return PTR_ERR(sii902x->reset_gpio);
1188 }
1189
1190 sii902x->bus_width = 24;
1191 endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
1192 if (endpoint)
1193 of_property_read_u32(endpoint, "bus-width", &sii902x->bus_width);
1194
1195 endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
1196 if (endpoint) {
1197 struct device_node *remote = of_graph_get_remote_port_parent(endpoint);
1198
1199 of_node_put(endpoint);
1200 if (!remote) {
1201 dev_err(dev, "Endpoint in port@1 unconnected\n");
1202 return -ENODEV;
1203 }
1204
1205 if (!of_device_is_available(remote)) {
1206 dev_err(dev, "port@1 remote device is disabled\n");
1207 of_node_put(remote);
1208 return -ENODEV;
1209 }
1210
1211 sii902x->next_bridge = of_drm_find_bridge(remote);
1212 of_node_put(remote);
1213 if (!sii902x->next_bridge)
1214 return dev_err_probe(dev, -EPROBE_DEFER,
1215 "Failed to find remote bridge\n");
1216 }
1217
1218 mutex_init(&sii902x->mutex);
1219
1220 ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), supplies);
1221 if (ret < 0)
1222 return dev_err_probe(dev, ret, "Failed to enable supplies");
1223
1224 return sii902x_init(sii902x);
1225 }
1226
sii902x_remove(struct i2c_client * client)1227 static void sii902x_remove(struct i2c_client *client)
1228 {
1229 struct sii902x *sii902x = i2c_get_clientdata(client);
1230
1231 drm_bridge_remove(&sii902x->bridge);
1232 i2c_mux_del_adapters(sii902x->i2cmux);
1233
1234 if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev))
1235 platform_device_unregister(sii902x->audio.pdev);
1236 }
1237
1238 static const struct of_device_id sii902x_dt_ids[] = {
1239 { .compatible = "sil,sii9022", },
1240 { }
1241 };
1242 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1243
1244 static const struct i2c_device_id sii902x_i2c_ids[] = {
1245 { "sii9022" },
1246 { }
1247 };
1248 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1249
1250 static struct i2c_driver sii902x_driver = {
1251 .probe = sii902x_probe,
1252 .remove = sii902x_remove,
1253 .driver = {
1254 .name = "sii902x",
1255 .of_match_table = sii902x_dt_ids,
1256 },
1257 .id_table = sii902x_i2c_ids,
1258 };
1259 module_i2c_driver(sii902x_driver);
1260
1261 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
1262 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1263 MODULE_LICENSE("GPL");
1264