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