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