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Merge branch 'akpm' (patches from Andrew)
[linux/fpc-iii.git] / drivers / gpu / drm / bridge / sii902x.c
blobb70e8c5cf2e13806f8361c1ccb4441cc5193be14
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/module.h>
19 #include <linux/regmap.h>
20 #include <linux/clk.h>
21
22 #include <drm/drm_atomic_helper.h>
23 #include <drm/drm_bridge.h>
24 #include <drm/drm_drv.h>
25 #include <drm/drm_edid.h>
26 #include <drm/drm_print.h>
27 #include <drm/drm_probe_helper.h>
28
29 #include <sound/hdmi-codec.h>
30
31 #define SII902X_TPI_VIDEO_DATA 0x0
32
33 #define SII902X_TPI_PIXEL_REPETITION 0x8
34 #define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5)
35 #define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4)
36 #define SII902X_TPI_AVI_PIXEL_REP_4X 3
37 #define SII902X_TPI_AVI_PIXEL_REP_2X 1
38 #define SII902X_TPI_AVI_PIXEL_REP_NONE 0
39 #define SII902X_TPI_CLK_RATIO_HALF (0 << 6)
40 #define SII902X_TPI_CLK_RATIO_1X (1 << 6)
41 #define SII902X_TPI_CLK_RATIO_2X (2 << 6)
42 #define SII902X_TPI_CLK_RATIO_4X (3 << 6)
43
44 #define SII902X_TPI_AVI_IN_FORMAT 0x9
45 #define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
46 #define SII902X_TPI_AVI_INPUT_DITHER BIT(6)
47 #define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
48 #define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2)
49 #define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2)
50 #define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0)
51 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
52 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
53 #define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0)
54
55 #define SII902X_TPI_AVI_INFOFRAME 0x0c
56
57 #define SII902X_SYS_CTRL_DATA 0x1a
58 #define SII902X_SYS_CTRL_PWR_DWN BIT(4)
59 #define SII902X_SYS_CTRL_AV_MUTE BIT(3)
60 #define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2)
61 #define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1)
62 #define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0)
63 #define SII902X_SYS_CTRL_OUTPUT_HDMI 1
64 #define SII902X_SYS_CTRL_OUTPUT_DVI 0
65
66 #define SII902X_REG_CHIPID(n) (0x1b + (n))
67
68 #define SII902X_PWR_STATE_CTRL 0x1e
69 #define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
70 #define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK)
71
72 /* Audio */
73 #define SII902X_TPI_I2S_ENABLE_MAPPING_REG 0x1f
74 #define SII902X_TPI_I2S_CONFIG_FIFO0 (0 << 0)
75 #define SII902X_TPI_I2S_CONFIG_FIFO1 (1 << 0)
76 #define SII902X_TPI_I2S_CONFIG_FIFO2 (2 << 0)
77 #define SII902X_TPI_I2S_CONFIG_FIFO3 (3 << 0)
78 #define SII902X_TPI_I2S_LEFT_RIGHT_SWAP (1 << 2)
79 #define SII902X_TPI_I2S_AUTO_DOWNSAMPLE (1 << 3)
80 #define SII902X_TPI_I2S_SELECT_SD0 (0 << 4)
81 #define SII902X_TPI_I2S_SELECT_SD1 (1 << 4)
82 #define SII902X_TPI_I2S_SELECT_SD2 (2 << 4)
83 #define SII902X_TPI_I2S_SELECT_SD3 (3 << 4)
84 #define SII902X_TPI_I2S_FIFO_ENABLE (1 << 7)
85
86 #define SII902X_TPI_I2S_INPUT_CONFIG_REG 0x20
87 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES (0 << 0)
88 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO (1 << 0)
89 #define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST (0 << 1)
90 #define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST (1 << 1)
91 #define SII902X_TPI_I2S_SD_JUSTIFY_LEFT (0 << 2)
92 #define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT (1 << 2)
93 #define SII902X_TPI_I2S_WS_POLARITY_LOW (0 << 3)
94 #define SII902X_TPI_I2S_WS_POLARITY_HIGH (1 << 3)
95 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_128 (0 << 4)
96 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_256 (1 << 4)
97 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_384 (2 << 4)
98 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_512 (3 << 4)
99 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_768 (4 << 4)
100 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024 (5 << 4)
101 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152 (6 << 4)
102 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_192 (7 << 4)
103 #define SII902X_TPI_I2S_SCK_EDGE_FALLING (0 << 7)
104 #define SII902X_TPI_I2S_SCK_EDGE_RISING (1 << 7)
105
106 #define SII902X_TPI_I2S_STRM_HDR_BASE 0x21
107 #define SII902X_TPI_I2S_STRM_HDR_SIZE 5
108
109 #define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG 0x26
110 #define SII902X_TPI_AUDIO_CODING_STREAM_HEADER (0 << 0)
111 #define SII902X_TPI_AUDIO_CODING_PCM (1 << 0)
112 #define SII902X_TPI_AUDIO_CODING_AC3 (2 << 0)
113 #define SII902X_TPI_AUDIO_CODING_MPEG1 (3 << 0)
114 #define SII902X_TPI_AUDIO_CODING_MP3 (4 << 0)
115 #define SII902X_TPI_AUDIO_CODING_MPEG2 (5 << 0)
116 #define SII902X_TPI_AUDIO_CODING_AAC (6 << 0)
117 #define SII902X_TPI_AUDIO_CODING_DTS (7 << 0)
118 #define SII902X_TPI_AUDIO_CODING_ATRAC (8 << 0)
119 #define SII902X_TPI_AUDIO_MUTE_DISABLE (0 << 4)
120 #define SII902X_TPI_AUDIO_MUTE_ENABLE (1 << 4)
121 #define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS (0 << 5)
122 #define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS (1 << 5)
123 #define SII902X_TPI_AUDIO_INTERFACE_DISABLE (0 << 6)
124 #define SII902X_TPI_AUDIO_INTERFACE_SPDIF (1 << 6)
125 #define SII902X_TPI_AUDIO_INTERFACE_I2S (2 << 6)
126
127 #define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG 0x27
128 #define SII902X_TPI_AUDIO_FREQ_STREAM (0 << 3)
129 #define SII902X_TPI_AUDIO_FREQ_32KHZ (1 << 3)
130 #define SII902X_TPI_AUDIO_FREQ_44KHZ (2 << 3)
131 #define SII902X_TPI_AUDIO_FREQ_48KHZ (3 << 3)
132 #define SII902X_TPI_AUDIO_FREQ_88KHZ (4 << 3)
133 #define SII902X_TPI_AUDIO_FREQ_96KHZ (5 << 3)
134 #define SII902X_TPI_AUDIO_FREQ_176KHZ (6 << 3)
135 #define SII902X_TPI_AUDIO_FREQ_192KHZ (7 << 3)
136 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM (0 << 6)
137 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_16 (1 << 6)
138 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_20 (2 << 6)
139 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_24 (3 << 6)
140
141 #define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG 0x28
142
143 #define SII902X_INT_ENABLE 0x3c
144 #define SII902X_INT_STATUS 0x3d
145 #define SII902X_HOTPLUG_EVENT BIT(0)
146 #define SII902X_PLUGGED_STATUS BIT(2)
147
148 #define SII902X_REG_TPI_RQB 0xc7
149
150 /* Indirect internal register access */
151 #define SII902X_IND_SET_PAGE 0xbc
152 #define SII902X_IND_OFFSET 0xbd
153 #define SII902X_IND_VALUE 0xbe
154
155 #define SII902X_TPI_MISC_INFOFRAME_BASE 0xbf
156 #define SII902X_TPI_MISC_INFOFRAME_END 0xde
157 #define SII902X_TPI_MISC_INFOFRAME_SIZE \
158 (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
159
160 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500
161
162 #define SII902X_AUDIO_PORT_INDEX 3
163
164 struct sii902x {
165 struct i2c_client *i2c;
166 struct regmap *regmap;
167 struct drm_bridge bridge;
168 struct drm_connector connector;
169 struct gpio_desc *reset_gpio;
170 struct i2c_mux_core *i2cmux;
171 /*
172 * Mutex protects audio and video functions from interfering
173 * each other, by keeping their i2c command sequences atomic.
174 */
175 struct mutex mutex;
176 struct sii902x_audio {
177 struct platform_device *pdev;
178 struct clk *mclk;
179 u32 i2s_fifo_sequence[4];
180 } audio;
181 };
182
183 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
184 {
185 union i2c_smbus_data data;
186 int ret;
187
188 ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
189 I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
190
191 if (ret < 0)
192 return ret;
193
194 *val = data.byte;
195 return 0;
196 }
197
198 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
199 {
200 union i2c_smbus_data data;
201
202 data.byte = val;
203
204 return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
205 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
206 &data);
207 }
208
209 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
210 u8 val)
211 {
212 int ret;
213 u8 status;
214
215 ret = sii902x_read_unlocked(i2c, reg, &status);
216 if (ret)
217 return ret;
218 status &= ~mask;
219 status |= val & mask;
220 return sii902x_write_unlocked(i2c, reg, status);
221 }
222
223 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
224 {
225 return container_of(bridge, struct sii902x, bridge);
226 }
227
228 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
229 {
230 return container_of(con, struct sii902x, connector);
231 }
232
233 static void sii902x_reset(struct sii902x *sii902x)
234 {
235 if (!sii902x->reset_gpio)
236 return;
237
238 gpiod_set_value(sii902x->reset_gpio, 1);
239
240 /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
241 usleep_range(150, 200);
242
243 gpiod_set_value(sii902x->reset_gpio, 0);
244 }
245
246 static enum drm_connector_status
247 sii902x_connector_detect(struct drm_connector *connector, bool force)
248 {
249 struct sii902x *sii902x = connector_to_sii902x(connector);
250 unsigned int status;
251
252 mutex_lock(&sii902x->mutex);
253
254 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
255
256 mutex_unlock(&sii902x->mutex);
257
258 return (status & SII902X_PLUGGED_STATUS) ?
259 connector_status_connected : connector_status_disconnected;
260 }
261
262 static const struct drm_connector_funcs sii902x_connector_funcs = {
263 .detect = sii902x_connector_detect,
264 .fill_modes = drm_helper_probe_single_connector_modes,
265 .destroy = drm_connector_cleanup,
266 .reset = drm_atomic_helper_connector_reset,
267 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
268 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
269 };
270
271 static int sii902x_get_modes(struct drm_connector *connector)
272 {
273 struct sii902x *sii902x = connector_to_sii902x(connector);
274 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
275 u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
276 struct edid *edid;
277 int num = 0, ret;
278
279 mutex_lock(&sii902x->mutex);
280
281 edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
282 drm_connector_update_edid_property(connector, edid);
283 if (edid) {
284 if (drm_detect_hdmi_monitor(edid))
285 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
286
287 num = drm_add_edid_modes(connector, edid);
288 kfree(edid);
289 }
290
291 ret = drm_display_info_set_bus_formats(&connector->display_info,
292 &bus_format, 1);
293 if (ret)
294 goto error_out;
295
296 ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
297 SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
298 if (ret)
299 goto error_out;
300
301 ret = num;
302
303 error_out:
304 mutex_unlock(&sii902x->mutex);
305
306 return ret;
307 }
308
309 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
310 struct drm_display_mode *mode)
311 {
312 /* TODO: check mode */
313
314 return MODE_OK;
315 }
316
317 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
318 .get_modes = sii902x_get_modes,
319 .mode_valid = sii902x_mode_valid,
320 };
321
322 static void sii902x_bridge_disable(struct drm_bridge *bridge)
323 {
324 struct sii902x *sii902x = bridge_to_sii902x(bridge);
325
326 mutex_lock(&sii902x->mutex);
327
328 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
329 SII902X_SYS_CTRL_PWR_DWN,
330 SII902X_SYS_CTRL_PWR_DWN);
331
332 mutex_unlock(&sii902x->mutex);
333 }
334
335 static void sii902x_bridge_enable(struct drm_bridge *bridge)
336 {
337 struct sii902x *sii902x = bridge_to_sii902x(bridge);
338
339 mutex_lock(&sii902x->mutex);
340
341 regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
342 SII902X_AVI_POWER_STATE_MSK,
343 SII902X_AVI_POWER_STATE_D(0));
344 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
345 SII902X_SYS_CTRL_PWR_DWN, 0);
346
347 mutex_unlock(&sii902x->mutex);
348 }
349
350 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
351 const struct drm_display_mode *mode,
352 const struct drm_display_mode *adj)
353 {
354 struct sii902x *sii902x = bridge_to_sii902x(bridge);
355 struct regmap *regmap = sii902x->regmap;
356 u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
357 struct hdmi_avi_infoframe frame;
358 u16 pixel_clock_10kHz = adj->clock / 10;
359 int ret;
360
361 buf[0] = pixel_clock_10kHz & 0xff;
362 buf[1] = pixel_clock_10kHz >> 8;
363 buf[2] = adj->vrefresh;
364 buf[3] = 0x00;
365 buf[4] = adj->hdisplay;
366 buf[5] = adj->hdisplay >> 8;
367 buf[6] = adj->vdisplay;
368 buf[7] = adj->vdisplay >> 8;
369 buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
370 SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
371 buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
372 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
373
374 mutex_lock(&sii902x->mutex);
375
376 ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
377 if (ret)
378 goto out;
379
380 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
381 &sii902x->connector, adj);
382 if (ret < 0) {
383 DRM_ERROR("couldn't fill AVI infoframe\n");
384 goto out;
385 }
386
387 ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
388 if (ret < 0) {
389 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
390 goto out;
391 }
392
393 /* Do not send the infoframe header, but keep the CRC field. */
394 regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
395 buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
396 HDMI_AVI_INFOFRAME_SIZE + 1);
397
398 out:
399 mutex_unlock(&sii902x->mutex);
400 }
401
402 static int sii902x_bridge_attach(struct drm_bridge *bridge)
403 {
404 struct sii902x *sii902x = bridge_to_sii902x(bridge);
405 struct drm_device *drm = bridge->dev;
406 int ret;
407
408 drm_connector_helper_add(&sii902x->connector,
409 &sii902x_connector_helper_funcs);
410
411 if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
412 dev_err(&sii902x->i2c->dev,
413 "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
414 return -ENOTSUPP;
415 }
416
417 ret = drm_connector_init(drm, &sii902x->connector,
418 &sii902x_connector_funcs,
419 DRM_MODE_CONNECTOR_HDMIA);
420 if (ret)
421 return ret;
422
423 if (sii902x->i2c->irq > 0)
424 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
425 else
426 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
427
428 drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
429
430 return 0;
431 }
432
433 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
434 .attach = sii902x_bridge_attach,
435 .mode_set = sii902x_bridge_mode_set,
436 .disable = sii902x_bridge_disable,
437 .enable = sii902x_bridge_enable,
438 };
439
440 static int sii902x_mute(struct sii902x *sii902x, bool mute)
441 {
442 struct device *dev = &sii902x->i2c->dev;
443 unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
444 SII902X_TPI_AUDIO_MUTE_DISABLE;
445
446 dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
447
448 return regmap_update_bits(sii902x->regmap,
449 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
450 SII902X_TPI_AUDIO_MUTE_ENABLE, val);
451 }
452
453 static const int sii902x_mclk_div_table[] = {
454 128, 256, 384, 512, 768, 1024, 1152, 192 };
455
456 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
457 unsigned int mclk)
458 {
459 int div = mclk / rate;
460 int distance = 100000;
461 u8 i, nearest = 0;
462
463 for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
464 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
465
466 if (d >= distance)
467 continue;
468
469 nearest = i;
470 distance = d;
471 if (d == 0)
472 break;
473 }
474
475 *i2s_config_reg |= nearest << 4;
476
477 return sii902x_mclk_div_table[nearest];
478 }
479
480 static const struct sii902x_sample_freq {
481 u32 freq;
482 u8 val;
483 } sii902x_sample_freq[] = {
484 { .freq = 32000, .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
485 { .freq = 44000, .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
486 { .freq = 48000, .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
487 { .freq = 88000, .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
488 { .freq = 96000, .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
489 { .freq = 176000, .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
490 { .freq = 192000, .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
491 };
492
493 static int sii902x_audio_hw_params(struct device *dev, void *data,
494 struct hdmi_codec_daifmt *daifmt,
495 struct hdmi_codec_params *params)
496 {
497 struct sii902x *sii902x = dev_get_drvdata(dev);
498 u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
499 u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
500 SII902X_TPI_AUDIO_MUTE_ENABLE |
501 SII902X_TPI_AUDIO_CODING_PCM);
502 u8 config_byte3_reg = 0;
503 u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
504 unsigned long mclk_rate;
505 int i, ret;
506
507 if (daifmt->bit_clk_master || daifmt->frame_clk_master) {
508 dev_dbg(dev, "%s: I2S master mode not supported\n", __func__);
509 return -EINVAL;
510 }
511
512 switch (daifmt->fmt) {
513 case HDMI_I2S:
514 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
515 SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
516 break;
517 case HDMI_RIGHT_J:
518 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
519 break;
520 case HDMI_LEFT_J:
521 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
522 break;
523 default:
524 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
525 daifmt->fmt);
526 return -EINVAL;
527 }
528
529 if (daifmt->bit_clk_inv)
530 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
531 else
532 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
533
534 if (daifmt->frame_clk_inv)
535 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
536 else
537 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
538
539 if (params->channels > 2)
540 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
541 else
542 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
543
544 switch (params->sample_width) {
545 case 16:
546 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
547 break;
548 case 20:
549 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
550 break;
551 case 24:
552 case 32:
553 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
554 break;
555 default:
556 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
557 params->sample_width);
558 return -EINVAL;
559 }
560
561 for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
562 if (params->sample_rate == sii902x_sample_freq[i].freq) {
563 config_byte3_reg |= sii902x_sample_freq[i].val;
564 break;
565 }
566 }
567
568 ret = clk_prepare_enable(sii902x->audio.mclk);
569 if (ret) {
570 dev_err(dev, "Enabling mclk failed: %d\n", ret);
571 return ret;
572 }
573
574 if (sii902x->audio.mclk) {
575 mclk_rate = clk_get_rate(sii902x->audio.mclk);
576 ret = sii902x_select_mclk_div(&i2s_config_reg,
577 params->sample_rate, mclk_rate);
578 if (mclk_rate != ret * params->sample_rate)
579 dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
580 mclk_rate, ret, params->sample_rate);
581 }
582
583 mutex_lock(&sii902x->mutex);
584
585 ret = regmap_write(sii902x->regmap,
586 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
587 config_byte2_reg);
588 if (ret < 0)
589 goto out;
590
591 ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
592 i2s_config_reg);
593 if (ret)
594 goto out;
595
596 for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
597 sii902x->audio.i2s_fifo_sequence[i]; i++)
598 regmap_write(sii902x->regmap,
599 SII902X_TPI_I2S_ENABLE_MAPPING_REG,
600 sii902x->audio.i2s_fifo_sequence[i]);
601
602 ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
603 config_byte3_reg);
604 if (ret)
605 goto out;
606
607 ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
608 params->iec.status,
609 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
610 sizeof(params->iec.status)));
611 if (ret)
612 goto out;
613
614 ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
615 sizeof(infoframe_buf));
616 if (ret < 0) {
617 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
618 __func__, ret);
619 goto out;
620 }
621
622 ret = regmap_bulk_write(sii902x->regmap,
623 SII902X_TPI_MISC_INFOFRAME_BASE,
624 infoframe_buf,
625 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
626 if (ret)
627 goto out;
628
629 /* Decode Level 0 Packets */
630 ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
631 if (ret)
632 goto out;
633
634 ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
635 if (ret)
636 goto out;
637
638 ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
639 if (ret)
640 goto out;
641
642 dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
643 out:
644 mutex_unlock(&sii902x->mutex);
645
646 if (ret) {
647 clk_disable_unprepare(sii902x->audio.mclk);
648 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
649 ret);
650 }
651
652 return ret;
653 }
654
655 static void sii902x_audio_shutdown(struct device *dev, void *data)
656 {
657 struct sii902x *sii902x = dev_get_drvdata(dev);
658
659 mutex_lock(&sii902x->mutex);
660
661 regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
662 SII902X_TPI_AUDIO_INTERFACE_DISABLE);
663
664 mutex_unlock(&sii902x->mutex);
665
666 clk_disable_unprepare(sii902x->audio.mclk);
667 }
668
669 static int sii902x_audio_digital_mute(struct device *dev,
670 void *data, bool enable)
671 {
672 struct sii902x *sii902x = dev_get_drvdata(dev);
673
674 mutex_lock(&sii902x->mutex);
675
676 sii902x_mute(sii902x, enable);
677
678 mutex_unlock(&sii902x->mutex);
679
680 return 0;
681 }
682
683 static int sii902x_audio_get_eld(struct device *dev, void *data,
684 uint8_t *buf, size_t len)
685 {
686 struct sii902x *sii902x = dev_get_drvdata(dev);
687
688 mutex_lock(&sii902x->mutex);
689
690 memcpy(buf, sii902x->connector.eld,
691 min(sizeof(sii902x->connector.eld), len));
692
693 mutex_unlock(&sii902x->mutex);
694
695 return 0;
696 }
697
698 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
699 struct device_node *endpoint)
700 {
701 struct of_endpoint of_ep;
702 int ret;
703
704 ret = of_graph_parse_endpoint(endpoint, &of_ep);
705 if (ret < 0)
706 return ret;
707
708 /*
709 * HDMI sound should be located at reg = <3>
710 * Return expected DAI index 0.
711 */
712 if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
713 return 0;
714
715 return -EINVAL;
716 }
717
718 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
719 .hw_params = sii902x_audio_hw_params,
720 .audio_shutdown = sii902x_audio_shutdown,
721 .digital_mute = sii902x_audio_digital_mute,
722 .get_eld = sii902x_audio_get_eld,
723 .get_dai_id = sii902x_audio_get_dai_id,
724 };
725
726 static int sii902x_audio_codec_init(struct sii902x *sii902x,
727 struct device *dev)
728 {
729 static const u8 audio_fifo_id[] = {
730 SII902X_TPI_I2S_CONFIG_FIFO0,
731 SII902X_TPI_I2S_CONFIG_FIFO1,
732 SII902X_TPI_I2S_CONFIG_FIFO2,
733 SII902X_TPI_I2S_CONFIG_FIFO3,
734 };
735 static const u8 i2s_lane_id[] = {
736 SII902X_TPI_I2S_SELECT_SD0,
737 SII902X_TPI_I2S_SELECT_SD1,
738 SII902X_TPI_I2S_SELECT_SD2,
739 SII902X_TPI_I2S_SELECT_SD3,
740 };
741 struct hdmi_codec_pdata codec_data = {
742 .ops = &sii902x_audio_codec_ops,
743 .i2s = 1, /* Only i2s support for now. */
744 .spdif = 0,
745 .max_i2s_channels = 0,
746 };
747 u8 lanes[4];
748 int num_lanes, i;
749
750 if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
751 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
752 __func__);
753 return 0;
754 }
755
756 num_lanes = of_property_read_variable_u8_array(dev->of_node,
757 "sil,i2s-data-lanes",
758 lanes, 1,
759 ARRAY_SIZE(lanes));
760
761 if (num_lanes == -EINVAL) {
762 dev_dbg(dev,
763 "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
764 __func__);
765 num_lanes = 1;
766 lanes[0] = 0;
767 } else if (num_lanes < 0) {
768 dev_err(dev,
769 "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
770 __func__, num_lanes);
771 return num_lanes;
772 }
773 codec_data.max_i2s_channels = 2 * num_lanes;
774
775 for (i = 0; i < num_lanes; i++)
776 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
777 i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
778
779 sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
780 if (IS_ERR(sii902x->audio.mclk)) {
781 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
782 __func__, PTR_ERR(sii902x->audio.mclk));
783 return PTR_ERR(sii902x->audio.mclk);
784 }
785
786 sii902x->audio.pdev = platform_device_register_data(
787 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
788 &codec_data, sizeof(codec_data));
789
790 return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
791 }
792
793 static const struct regmap_range sii902x_volatile_ranges[] = {
794 { .range_min = 0, .range_max = 0xff },
795 };
796
797 static const struct regmap_access_table sii902x_volatile_table = {
798 .yes_ranges = sii902x_volatile_ranges,
799 .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
800 };
801
802 static const struct regmap_config sii902x_regmap_config = {
803 .reg_bits = 8,
804 .val_bits = 8,
805 .disable_locking = true, /* struct sii902x mutex should be enough */
806 .max_register = SII902X_TPI_MISC_INFOFRAME_END,
807 .volatile_table = &sii902x_volatile_table,
808 .cache_type = REGCACHE_NONE,
809 };
810
811 static irqreturn_t sii902x_interrupt(int irq, void *data)
812 {
813 struct sii902x *sii902x = data;
814 unsigned int status = 0;
815
816 mutex_lock(&sii902x->mutex);
817
818 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
819 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
820
821 mutex_unlock(&sii902x->mutex);
822
823 if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
824 drm_helper_hpd_irq_event(sii902x->bridge.dev);
825
826 return IRQ_HANDLED;
827 }
828
829 /*
830 * The purpose of sii902x_i2c_bypass_select is to enable the pass through
831 * mode of the HDMI transmitter. Do not use regmap from within this function,
832 * only use sii902x_*_unlocked functions to read/modify/write registers.
833 * We are holding the parent adapter lock here, keep this in mind before
834 * adding more i2c transactions.
835 *
836 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
837 * in this driver, we need to make sure that we only touch 0x1A[2:1] from
838 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
839 * we leave the remaining bits as we have found them.
840 */
841 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
842 {
843 struct sii902x *sii902x = i2c_mux_priv(mux);
844 struct device *dev = &sii902x->i2c->dev;
845 unsigned long timeout;
846 u8 status;
847 int ret;
848
849 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
850 SII902X_SYS_CTRL_DDC_BUS_REQ,
851 SII902X_SYS_CTRL_DDC_BUS_REQ);
852 if (ret)
853 return ret;
854
855 timeout = jiffies +
856 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
857 do {
858 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
859 &status);
860 if (ret)
861 return ret;
862 } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
863 time_before(jiffies, timeout));
864
865 if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
866 dev_err(dev, "Failed to acquire the i2c bus\n");
867 return -ETIMEDOUT;
868 }
869
870 return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
871 status);
872 }
873
874 /*
875 * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
876 * mode of the HDMI transmitter. Do not use regmap from within this function,
877 * only use sii902x_*_unlocked functions to read/modify/write registers.
878 * We are holding the parent adapter lock here, keep this in mind before
879 * adding more i2c transactions.
880 *
881 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
882 * in this driver, we need to make sure that we only touch 0x1A[2:1] from
883 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
884 * we leave the remaining bits as we have found them.
885 */
886 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
887 {
888 struct sii902x *sii902x = i2c_mux_priv(mux);
889 struct device *dev = &sii902x->i2c->dev;
890 unsigned long timeout;
891 unsigned int retries;
892 u8 status;
893 int ret;
894
895 /*
896 * When the HDMI transmitter is in pass through mode, we need an
897 * (undocumented) additional delay between STOP and START conditions
898 * to guarantee the bus won't get stuck.
899 */
900 udelay(30);
901
902 /*
903 * Sometimes the I2C bus can stall after failure to use the
904 * EDID channel. Retry a few times to see if things clear
905 * up, else continue anyway.
906 */
907 retries = 5;
908 do {
909 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
910 &status);
911 retries--;
912 } while (ret && retries);
913 if (ret) {
914 dev_err(dev, "failed to read status (%d)\n", ret);
915 return ret;
916 }
917
918 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
919 SII902X_SYS_CTRL_DDC_BUS_REQ |
920 SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
921 if (ret)
922 return ret;
923
924 timeout = jiffies +
925 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
926 do {
927 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
928 &status);
929 if (ret)
930 return ret;
931 } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
932 SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
933 time_before(jiffies, timeout));
934
935 if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
936 SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
937 dev_err(dev, "failed to release the i2c bus\n");
938 return -ETIMEDOUT;
939 }
940
941 return 0;
942 }
943
944 static const struct drm_bridge_timings default_sii902x_timings = {
945 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
946 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
947 | DRM_BUS_FLAG_DE_HIGH,
948 };
949
950 static int sii902x_probe(struct i2c_client *client,
951 const struct i2c_device_id *id)
952 {
953 struct device *dev = &client->dev;
954 unsigned int status = 0;
955 struct sii902x *sii902x;
956 u8 chipid[4];
957 int ret;
958
959 ret = i2c_check_functionality(client->adapter,
960 I2C_FUNC_SMBUS_BYTE_DATA);
961 if (!ret) {
962 dev_err(dev, "I2C adapter not suitable\n");
963 return -EIO;
964 }
965
966 sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
967 if (!sii902x)
968 return -ENOMEM;
969
970 sii902x->i2c = client;
971 sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
972 if (IS_ERR(sii902x->regmap))
973 return PTR_ERR(sii902x->regmap);
974
975 sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
976 GPIOD_OUT_LOW);
977 if (IS_ERR(sii902x->reset_gpio)) {
978 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
979 PTR_ERR(sii902x->reset_gpio));
980 return PTR_ERR(sii902x->reset_gpio);
981 }
982
983 mutex_init(&sii902x->mutex);
984
985 sii902x_reset(sii902x);
986
987 ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
988 if (ret)
989 return ret;
990
991 ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
992 &chipid, 4);
993 if (ret) {
994 dev_err(dev, "regmap_read failed %d\n", ret);
995 return ret;
996 }
997
998 if (chipid[0] != 0xb0) {
999 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
1000 chipid[0]);
1001 return -EINVAL;
1002 }
1003
1004 /* Clear all pending interrupts */
1005 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
1006 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
1007
1008 if (client->irq > 0) {
1009 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
1010 SII902X_HOTPLUG_EVENT);
1011
1012 ret = devm_request_threaded_irq(dev, client->irq, NULL,
1013 sii902x_interrupt,
1014 IRQF_ONESHOT, dev_name(dev),
1015 sii902x);
1016 if (ret)
1017 return ret;
1018 }
1019
1020 sii902x->bridge.funcs = &sii902x_bridge_funcs;
1021 sii902x->bridge.of_node = dev->of_node;
1022 sii902x->bridge.timings = &default_sii902x_timings;
1023 drm_bridge_add(&sii902x->bridge);
1024
1025 sii902x_audio_codec_init(sii902x, dev);
1026
1027 i2c_set_clientdata(client, sii902x);
1028
1029 sii902x->i2cmux = i2c_mux_alloc(client->adapter, dev,
1030 1, 0, I2C_MUX_GATE,
1031 sii902x_i2c_bypass_select,
1032 sii902x_i2c_bypass_deselect);
1033 if (!sii902x->i2cmux)
1034 return -ENOMEM;
1035
1036 sii902x->i2cmux->priv = sii902x;
1037 return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);
1038 }
1039
1040 static int sii902x_remove(struct i2c_client *client)
1041
1042 {
1043 struct sii902x *sii902x = i2c_get_clientdata(client);
1044
1045 i2c_mux_del_adapters(sii902x->i2cmux);
1046 drm_bridge_remove(&sii902x->bridge);
1047
1048 return 0;
1049 }
1050
1051 static const struct of_device_id sii902x_dt_ids[] = {
1052 { .compatible = "sil,sii9022", },
1053 { }
1054 };
1055 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1056
1057 static const struct i2c_device_id sii902x_i2c_ids[] = {
1058 { "sii9022", 0 },
1059 { },
1060 };
1061 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1062
1063 static struct i2c_driver sii902x_driver = {
1064 .probe = sii902x_probe,
1065 .remove = sii902x_remove,
1066 .driver = {
1067 .name = "sii902x",
1068 .of_match_table = sii902x_dt_ids,
1069 },
1070 .id_table = sii902x_i2c_ids,
1071 };
1072 module_i2c_driver(sii902x_driver);
1073
1074 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
1075 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1076 MODULE_LICENSE("GPL");
Linux with added FPC-III support