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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/regulator/consumer.h>
21#include <linux/clk.h>
22
23#include <drm/drm_atomic_helper.h>
24#include <drm/drm_bridge.h>
25#include <drm/drm_drv.h>
26#include <drm/drm_edid.h>
27#include <drm/drm_print.h>
28#include <drm/drm_probe_helper.h>
29
30#include <sound/hdmi-codec.h>
31
32#define SII902X_TPI_VIDEO_DATA 0x0
33
34#define SII902X_TPI_PIXEL_REPETITION 0x8
35#define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5)
36#define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4)
37#define SII902X_TPI_AVI_PIXEL_REP_4X 3
38#define SII902X_TPI_AVI_PIXEL_REP_2X 1
39#define SII902X_TPI_AVI_PIXEL_REP_NONE 0
40#define SII902X_TPI_CLK_RATIO_HALF (0 << 6)
41#define SII902X_TPI_CLK_RATIO_1X (1 << 6)
42#define SII902X_TPI_CLK_RATIO_2X (2 << 6)
43#define SII902X_TPI_CLK_RATIO_4X (3 << 6)
44
45#define SII902X_TPI_AVI_IN_FORMAT 0x9
46#define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
47#define SII902X_TPI_AVI_INPUT_DITHER BIT(6)
48#define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
49#define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2)
50#define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2)
51#define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0)
52#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
53#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
54#define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0)
55
56#define SII902X_TPI_AVI_INFOFRAME 0x0c
57
58#define SII902X_SYS_CTRL_DATA 0x1a
59#define SII902X_SYS_CTRL_PWR_DWN BIT(4)
60#define SII902X_SYS_CTRL_AV_MUTE BIT(3)
61#define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2)
62#define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1)
63#define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0)
64#define SII902X_SYS_CTRL_OUTPUT_HDMI 1
65#define SII902X_SYS_CTRL_OUTPUT_DVI 0
66
67#define SII902X_REG_CHIPID(n) (0x1b + (n))
68
69#define SII902X_PWR_STATE_CTRL 0x1e
70#define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
71#define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK)
72
73/* Audio */
74#define SII902X_TPI_I2S_ENABLE_MAPPING_REG 0x1f
75#define SII902X_TPI_I2S_CONFIG_FIFO0 (0 << 0)
76#define SII902X_TPI_I2S_CONFIG_FIFO1 (1 << 0)
77#define SII902X_TPI_I2S_CONFIG_FIFO2 (2 << 0)
78#define SII902X_TPI_I2S_CONFIG_FIFO3 (3 << 0)
79#define SII902X_TPI_I2S_LEFT_RIGHT_SWAP (1 << 2)
80#define SII902X_TPI_I2S_AUTO_DOWNSAMPLE (1 << 3)
81#define SII902X_TPI_I2S_SELECT_SD0 (0 << 4)
82#define SII902X_TPI_I2S_SELECT_SD1 (1 << 4)
83#define SII902X_TPI_I2S_SELECT_SD2 (2 << 4)
84#define SII902X_TPI_I2S_SELECT_SD3 (3 << 4)
85#define SII902X_TPI_I2S_FIFO_ENABLE (1 << 7)
86
87#define SII902X_TPI_I2S_INPUT_CONFIG_REG 0x20
88#define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES (0 << 0)
89#define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO (1 << 0)
90#define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST (0 << 1)
91#define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST (1 << 1)
92#define SII902X_TPI_I2S_SD_JUSTIFY_LEFT (0 << 2)
93#define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT (1 << 2)
94#define SII902X_TPI_I2S_WS_POLARITY_LOW (0 << 3)
95#define SII902X_TPI_I2S_WS_POLARITY_HIGH (1 << 3)
96#define SII902X_TPI_I2S_MCLK_MULTIPLIER_128 (0 << 4)
97#define SII902X_TPI_I2S_MCLK_MULTIPLIER_256 (1 << 4)
98#define SII902X_TPI_I2S_MCLK_MULTIPLIER_384 (2 << 4)
99#define SII902X_TPI_I2S_MCLK_MULTIPLIER_512 (3 << 4)
100#define SII902X_TPI_I2S_MCLK_MULTIPLIER_768 (4 << 4)
101#define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024 (5 << 4)
102#define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152 (6 << 4)
103#define SII902X_TPI_I2S_MCLK_MULTIPLIER_192 (7 << 4)
104#define SII902X_TPI_I2S_SCK_EDGE_FALLING (0 << 7)
105#define SII902X_TPI_I2S_SCK_EDGE_RISING (1 << 7)
106
107#define SII902X_TPI_I2S_STRM_HDR_BASE 0x21
108#define SII902X_TPI_I2S_STRM_HDR_SIZE 5
109
110#define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG 0x26
111#define SII902X_TPI_AUDIO_CODING_STREAM_HEADER (0 << 0)
112#define SII902X_TPI_AUDIO_CODING_PCM (1 << 0)
113#define SII902X_TPI_AUDIO_CODING_AC3 (2 << 0)
114#define SII902X_TPI_AUDIO_CODING_MPEG1 (3 << 0)
115#define SII902X_TPI_AUDIO_CODING_MP3 (4 << 0)
116#define SII902X_TPI_AUDIO_CODING_MPEG2 (5 << 0)
117#define SII902X_TPI_AUDIO_CODING_AAC (6 << 0)
118#define SII902X_TPI_AUDIO_CODING_DTS (7 << 0)
119#define SII902X_TPI_AUDIO_CODING_ATRAC (8 << 0)
120#define SII902X_TPI_AUDIO_MUTE_DISABLE (0 << 4)
121#define SII902X_TPI_AUDIO_MUTE_ENABLE (1 << 4)
122#define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS (0 << 5)
123#define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS (1 << 5)
124#define SII902X_TPI_AUDIO_INTERFACE_DISABLE (0 << 6)
125#define SII902X_TPI_AUDIO_INTERFACE_SPDIF (1 << 6)
126#define SII902X_TPI_AUDIO_INTERFACE_I2S (2 << 6)
127
128#define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG 0x27
129#define SII902X_TPI_AUDIO_FREQ_STREAM (0 << 3)
130#define SII902X_TPI_AUDIO_FREQ_32KHZ (1 << 3)
131#define SII902X_TPI_AUDIO_FREQ_44KHZ (2 << 3)
132#define SII902X_TPI_AUDIO_FREQ_48KHZ (3 << 3)
133#define SII902X_TPI_AUDIO_FREQ_88KHZ (4 << 3)
134#define SII902X_TPI_AUDIO_FREQ_96KHZ (5 << 3)
135#define SII902X_TPI_AUDIO_FREQ_176KHZ (6 << 3)
136#define SII902X_TPI_AUDIO_FREQ_192KHZ (7 << 3)
137#define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM (0 << 6)
138#define SII902X_TPI_AUDIO_SAMPLE_SIZE_16 (1 << 6)
139#define SII902X_TPI_AUDIO_SAMPLE_SIZE_20 (2 << 6)
140#define SII902X_TPI_AUDIO_SAMPLE_SIZE_24 (3 << 6)
141
142#define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG 0x28
143
144#define SII902X_INT_ENABLE 0x3c
145#define SII902X_INT_STATUS 0x3d
146#define SII902X_HOTPLUG_EVENT BIT(0)
147#define SII902X_PLUGGED_STATUS BIT(2)
148
149#define SII902X_REG_TPI_RQB 0xc7
150
151/* Indirect internal register access */
152#define SII902X_IND_SET_PAGE 0xbc
153#define SII902X_IND_OFFSET 0xbd
154#define SII902X_IND_VALUE 0xbe
155
156#define SII902X_TPI_MISC_INFOFRAME_BASE 0xbf
157#define SII902X_TPI_MISC_INFOFRAME_END 0xde
158#define SII902X_TPI_MISC_INFOFRAME_SIZE \
159 (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
160
161#define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500
162
163#define SII902X_AUDIO_PORT_INDEX 3
164
165struct sii902x {
166 struct i2c_client *i2c;
167 struct regmap *regmap;
168 struct drm_bridge bridge;
169 struct drm_connector connector;
170 struct gpio_desc *reset_gpio;
171 struct i2c_mux_core *i2cmux;
172 struct regulator_bulk_data supplies[2];
173 /*
174 * Mutex protects audio and video functions from interfering
175 * each other, by keeping their i2c command sequences atomic.
176 */
177 struct mutex mutex;
178 struct sii902x_audio {
179 struct platform_device *pdev;
180 struct clk *mclk;
181 u32 i2s_fifo_sequence[4];
182 } audio;
183};
184
185static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
186{
187 union i2c_smbus_data data;
188 int ret;
189
190 ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
191 I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
192
193 if (ret < 0)
194 return ret;
195
196 *val = data.byte;
197 return 0;
198}
199
200static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
201{
202 union i2c_smbus_data data;
203
204 data.byte = val;
205
206 return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
207 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
208 &data);
209}
210
211static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
212 u8 val)
213{
214 int ret;
215 u8 status;
216
217 ret = sii902x_read_unlocked(i2c, reg, &status);
218 if (ret)
219 return ret;
220 status &= ~mask;
221 status |= val & mask;
222 return sii902x_write_unlocked(i2c, reg, status);
223}
224
225static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
226{
227 return container_of(bridge, struct sii902x, bridge);
228}
229
230static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
231{
232 return container_of(con, struct sii902x, connector);
233}
234
235static void sii902x_reset(struct sii902x *sii902x)
236{
237 if (!sii902x->reset_gpio)
238 return;
239
240 gpiod_set_value(sii902x->reset_gpio, 1);
241
242 /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
243 usleep_range(150, 200);
244
245 gpiod_set_value(sii902x->reset_gpio, 0);
246}
247
248static enum drm_connector_status
249sii902x_connector_detect(struct drm_connector *connector, bool force)
250{
251 struct sii902x *sii902x = connector_to_sii902x(connector);
252 unsigned int status;
253
254 mutex_lock(&sii902x->mutex);
255
256 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
257
258 mutex_unlock(&sii902x->mutex);
259
260 return (status & SII902X_PLUGGED_STATUS) ?
261 connector_status_connected : connector_status_disconnected;
262}
263
264static const struct drm_connector_funcs sii902x_connector_funcs = {
265 .detect = sii902x_connector_detect,
266 .fill_modes = drm_helper_probe_single_connector_modes,
267 .destroy = drm_connector_cleanup,
268 .reset = drm_atomic_helper_connector_reset,
269 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
270 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
271};
272
273static int sii902x_get_modes(struct drm_connector *connector)
274{
275 struct sii902x *sii902x = connector_to_sii902x(connector);
276 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
277 u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
278 struct edid *edid;
279 int num = 0, ret;
280
281 mutex_lock(&sii902x->mutex);
282
283 edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
284 drm_connector_update_edid_property(connector, edid);
285 if (edid) {
286 if (drm_detect_hdmi_monitor(edid))
287 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
288
289 num = drm_add_edid_modes(connector, edid);
290 kfree(edid);
291 }
292
293 ret = drm_display_info_set_bus_formats(&connector->display_info,
294 &bus_format, 1);
295 if (ret)
296 goto error_out;
297
298 ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
299 SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
300 if (ret)
301 goto error_out;
302
303 ret = num;
304
305error_out:
306 mutex_unlock(&sii902x->mutex);
307
308 return ret;
309}
310
311static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
312 struct drm_display_mode *mode)
313{
314 /* TODO: check mode */
315
316 return MODE_OK;
317}
318
319static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
320 .get_modes = sii902x_get_modes,
321 .mode_valid = sii902x_mode_valid,
322};
323
324static void sii902x_bridge_disable(struct drm_bridge *bridge)
325{
326 struct sii902x *sii902x = bridge_to_sii902x(bridge);
327
328 mutex_lock(&sii902x->mutex);
329
330 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
331 SII902X_SYS_CTRL_PWR_DWN,
332 SII902X_SYS_CTRL_PWR_DWN);
333
334 mutex_unlock(&sii902x->mutex);
335}
336
337static void sii902x_bridge_enable(struct drm_bridge *bridge)
338{
339 struct sii902x *sii902x = bridge_to_sii902x(bridge);
340
341 mutex_lock(&sii902x->mutex);
342
343 regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
344 SII902X_AVI_POWER_STATE_MSK,
345 SII902X_AVI_POWER_STATE_D(0));
346 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
347 SII902X_SYS_CTRL_PWR_DWN, 0);
348
349 mutex_unlock(&sii902x->mutex);
350}
351
352static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
353 const struct drm_display_mode *mode,
354 const struct drm_display_mode *adj)
355{
356 struct sii902x *sii902x = bridge_to_sii902x(bridge);
357 struct regmap *regmap = sii902x->regmap;
358 u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
359 struct hdmi_avi_infoframe frame;
360 u16 pixel_clock_10kHz = adj->clock / 10;
361 int ret;
362
363 buf[0] = pixel_clock_10kHz & 0xff;
364 buf[1] = pixel_clock_10kHz >> 8;
365 buf[2] = drm_mode_vrefresh(adj);
366 buf[3] = 0x00;
367 buf[4] = adj->hdisplay;
368 buf[5] = adj->hdisplay >> 8;
369 buf[6] = adj->vdisplay;
370 buf[7] = adj->vdisplay >> 8;
371 buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
372 SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
373 buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
374 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
375
376 mutex_lock(&sii902x->mutex);
377
378 ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
379 if (ret)
380 goto out;
381
382 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
383 &sii902x->connector, adj);
384 if (ret < 0) {
385 DRM_ERROR("couldn't fill AVI infoframe\n");
386 goto out;
387 }
388
389 ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
390 if (ret < 0) {
391 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
392 goto out;
393 }
394
395 /* Do not send the infoframe header, but keep the CRC field. */
396 regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
397 buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
398 HDMI_AVI_INFOFRAME_SIZE + 1);
399
400out:
401 mutex_unlock(&sii902x->mutex);
402}
403
404static int sii902x_bridge_attach(struct drm_bridge *bridge,
405 enum drm_bridge_attach_flags flags)
406{
407 struct sii902x *sii902x = bridge_to_sii902x(bridge);
408 struct drm_device *drm = bridge->dev;
409 int ret;
410
411 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
412 DRM_ERROR("Fix bridge driver to make connector optional!");
413 return -EINVAL;
414 }
415
416 drm_connector_helper_add(&sii902x->connector,
417 &sii902x_connector_helper_funcs);
418
419 if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
420 dev_err(&sii902x->i2c->dev,
421 "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
422 return -ENOTSUPP;
423 }
424
425 ret = drm_connector_init(drm, &sii902x->connector,
426 &sii902x_connector_funcs,
427 DRM_MODE_CONNECTOR_HDMIA);
428 if (ret)
429 return ret;
430
431 if (sii902x->i2c->irq > 0)
432 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
433 else
434 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
435
436 drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
437
438 return 0;
439}
440
441static const struct drm_bridge_funcs sii902x_bridge_funcs = {
442 .attach = sii902x_bridge_attach,
443 .mode_set = sii902x_bridge_mode_set,
444 .disable = sii902x_bridge_disable,
445 .enable = sii902x_bridge_enable,
446};
447
448static int sii902x_mute(struct sii902x *sii902x, bool mute)
449{
450 struct device *dev = &sii902x->i2c->dev;
451 unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
452 SII902X_TPI_AUDIO_MUTE_DISABLE;
453
454 dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
455
456 return regmap_update_bits(sii902x->regmap,
457 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
458 SII902X_TPI_AUDIO_MUTE_ENABLE, val);
459}
460
461static const int sii902x_mclk_div_table[] = {
462 128, 256, 384, 512, 768, 1024, 1152, 192 };
463
464static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
465 unsigned int mclk)
466{
467 int div = mclk / rate;
468 int distance = 100000;
469 u8 i, nearest = 0;
470
471 for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
472 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
473
474 if (d >= distance)
475 continue;
476
477 nearest = i;
478 distance = d;
479 if (d == 0)
480 break;
481 }
482
483 *i2s_config_reg |= nearest << 4;
484
485 return sii902x_mclk_div_table[nearest];
486}
487
488static const struct sii902x_sample_freq {
489 u32 freq;
490 u8 val;
491} sii902x_sample_freq[] = {
492 { .freq = 32000, .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
493 { .freq = 44000, .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
494 { .freq = 48000, .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
495 { .freq = 88000, .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
496 { .freq = 96000, .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
497 { .freq = 176000, .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
498 { .freq = 192000, .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
499};
500
501static int sii902x_audio_hw_params(struct device *dev, void *data,
502 struct hdmi_codec_daifmt *daifmt,
503 struct hdmi_codec_params *params)
504{
505 struct sii902x *sii902x = dev_get_drvdata(dev);
506 u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
507 u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
508 SII902X_TPI_AUDIO_MUTE_ENABLE |
509 SII902X_TPI_AUDIO_CODING_PCM);
510 u8 config_byte3_reg = 0;
511 u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
512 unsigned long mclk_rate;
513 int i, ret;
514
515 if (daifmt->bit_clk_master || daifmt->frame_clk_master) {
516 dev_dbg(dev, "%s: I2S master mode not supported\n", __func__);
517 return -EINVAL;
518 }
519
520 switch (daifmt->fmt) {
521 case HDMI_I2S:
522 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
523 SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
524 break;
525 case HDMI_RIGHT_J:
526 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
527 break;
528 case HDMI_LEFT_J:
529 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
530 break;
531 default:
532 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
533 daifmt->fmt);
534 return -EINVAL;
535 }
536
537 if (daifmt->bit_clk_inv)
538 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
539 else
540 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
541
542 if (daifmt->frame_clk_inv)
543 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
544 else
545 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
546
547 if (params->channels > 2)
548 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
549 else
550 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
551
552 switch (params->sample_width) {
553 case 16:
554 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
555 break;
556 case 20:
557 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
558 break;
559 case 24:
560 case 32:
561 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
562 break;
563 default:
564 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
565 params->sample_width);
566 return -EINVAL;
567 }
568
569 for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
570 if (params->sample_rate == sii902x_sample_freq[i].freq) {
571 config_byte3_reg |= sii902x_sample_freq[i].val;
572 break;
573 }
574 }
575
576 ret = clk_prepare_enable(sii902x->audio.mclk);
577 if (ret) {
578 dev_err(dev, "Enabling mclk failed: %d\n", ret);
579 return ret;
580 }
581
582 if (sii902x->audio.mclk) {
583 mclk_rate = clk_get_rate(sii902x->audio.mclk);
584 ret = sii902x_select_mclk_div(&i2s_config_reg,
585 params->sample_rate, mclk_rate);
586 if (mclk_rate != ret * params->sample_rate)
587 dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
588 mclk_rate, ret, params->sample_rate);
589 }
590
591 mutex_lock(&sii902x->mutex);
592
593 ret = regmap_write(sii902x->regmap,
594 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
595 config_byte2_reg);
596 if (ret < 0)
597 goto out;
598
599 ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
600 i2s_config_reg);
601 if (ret)
602 goto out;
603
604 for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
605 sii902x->audio.i2s_fifo_sequence[i]; i++)
606 regmap_write(sii902x->regmap,
607 SII902X_TPI_I2S_ENABLE_MAPPING_REG,
608 sii902x->audio.i2s_fifo_sequence[i]);
609
610 ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
611 config_byte3_reg);
612 if (ret)
613 goto out;
614
615 ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
616 params->iec.status,
617 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
618 sizeof(params->iec.status)));
619 if (ret)
620 goto out;
621
622 ret = hdmi_audio_infoframe_pack(¶ms->cea, infoframe_buf,
623 sizeof(infoframe_buf));
624 if (ret < 0) {
625 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
626 __func__, ret);
627 goto out;
628 }
629
630 ret = regmap_bulk_write(sii902x->regmap,
631 SII902X_TPI_MISC_INFOFRAME_BASE,
632 infoframe_buf,
633 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
634 if (ret)
635 goto out;
636
637 /* Decode Level 0 Packets */
638 ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
639 if (ret)
640 goto out;
641
642 ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
643 if (ret)
644 goto out;
645
646 ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
647 if (ret)
648 goto out;
649
650 dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
651out:
652 mutex_unlock(&sii902x->mutex);
653
654 if (ret) {
655 clk_disable_unprepare(sii902x->audio.mclk);
656 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
657 ret);
658 }
659
660 return ret;
661}
662
663static void sii902x_audio_shutdown(struct device *dev, void *data)
664{
665 struct sii902x *sii902x = dev_get_drvdata(dev);
666
667 mutex_lock(&sii902x->mutex);
668
669 regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
670 SII902X_TPI_AUDIO_INTERFACE_DISABLE);
671
672 mutex_unlock(&sii902x->mutex);
673
674 clk_disable_unprepare(sii902x->audio.mclk);
675}
676
677static int sii902x_audio_mute(struct device *dev, void *data,
678 bool enable, int direction)
679{
680 struct sii902x *sii902x = dev_get_drvdata(dev);
681
682 mutex_lock(&sii902x->mutex);
683
684 sii902x_mute(sii902x, enable);
685
686 mutex_unlock(&sii902x->mutex);
687
688 return 0;
689}
690
691static int sii902x_audio_get_eld(struct device *dev, void *data,
692 uint8_t *buf, size_t len)
693{
694 struct sii902x *sii902x = dev_get_drvdata(dev);
695
696 mutex_lock(&sii902x->mutex);
697
698 memcpy(buf, sii902x->connector.eld,
699 min(sizeof(sii902x->connector.eld), len));
700
701 mutex_unlock(&sii902x->mutex);
702
703 return 0;
704}
705
706static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
707 struct device_node *endpoint)
708{
709 struct of_endpoint of_ep;
710 int ret;
711
712 ret = of_graph_parse_endpoint(endpoint, &of_ep);
713 if (ret < 0)
714 return ret;
715
716 /*
717 * HDMI sound should be located at reg = <3>
718 * Return expected DAI index 0.
719 */
720 if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
721 return 0;
722
723 return -EINVAL;
724}
725
726static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
727 .hw_params = sii902x_audio_hw_params,
728 .audio_shutdown = sii902x_audio_shutdown,
729 .mute_stream = sii902x_audio_mute,
730 .get_eld = sii902x_audio_get_eld,
731 .get_dai_id = sii902x_audio_get_dai_id,
732 .no_capture_mute = 1,
733};
734
735static int sii902x_audio_codec_init(struct sii902x *sii902x,
736 struct device *dev)
737{
738 static const u8 audio_fifo_id[] = {
739 SII902X_TPI_I2S_CONFIG_FIFO0,
740 SII902X_TPI_I2S_CONFIG_FIFO1,
741 SII902X_TPI_I2S_CONFIG_FIFO2,
742 SII902X_TPI_I2S_CONFIG_FIFO3,
743 };
744 static const u8 i2s_lane_id[] = {
745 SII902X_TPI_I2S_SELECT_SD0,
746 SII902X_TPI_I2S_SELECT_SD1,
747 SII902X_TPI_I2S_SELECT_SD2,
748 SII902X_TPI_I2S_SELECT_SD3,
749 };
750 struct hdmi_codec_pdata codec_data = {
751 .ops = &sii902x_audio_codec_ops,
752 .i2s = 1, /* Only i2s support for now. */
753 .spdif = 0,
754 .max_i2s_channels = 0,
755 };
756 u8 lanes[4];
757 int num_lanes, i;
758
759 if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
760 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
761 __func__);
762 return 0;
763 }
764
765 num_lanes = of_property_read_variable_u8_array(dev->of_node,
766 "sil,i2s-data-lanes",
767 lanes, 1,
768 ARRAY_SIZE(lanes));
769
770 if (num_lanes == -EINVAL) {
771 dev_dbg(dev,
772 "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
773 __func__);
774 num_lanes = 1;
775 lanes[0] = 0;
776 } else if (num_lanes < 0) {
777 dev_err(dev,
778 "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
779 __func__, num_lanes);
780 return num_lanes;
781 }
782 codec_data.max_i2s_channels = 2 * num_lanes;
783
784 for (i = 0; i < num_lanes; i++)
785 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
786 i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
787
788 sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
789 if (IS_ERR(sii902x->audio.mclk)) {
790 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
791 __func__, PTR_ERR(sii902x->audio.mclk));
792 return PTR_ERR(sii902x->audio.mclk);
793 }
794
795 sii902x->audio.pdev = platform_device_register_data(
796 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
797 &codec_data, sizeof(codec_data));
798
799 return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
800}
801
802static const struct regmap_range sii902x_volatile_ranges[] = {
803 { .range_min = 0, .range_max = 0xff },
804};
805
806static const struct regmap_access_table sii902x_volatile_table = {
807 .yes_ranges = sii902x_volatile_ranges,
808 .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
809};
810
811static const struct regmap_config sii902x_regmap_config = {
812 .reg_bits = 8,
813 .val_bits = 8,
814 .disable_locking = true, /* struct sii902x mutex should be enough */
815 .max_register = SII902X_TPI_MISC_INFOFRAME_END,
816 .volatile_table = &sii902x_volatile_table,
817 .cache_type = REGCACHE_NONE,
818};
819
820static irqreturn_t sii902x_interrupt(int irq, void *data)
821{
822 struct sii902x *sii902x = data;
823 unsigned int status = 0;
824
825 mutex_lock(&sii902x->mutex);
826
827 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
828 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
829
830 mutex_unlock(&sii902x->mutex);
831
832 if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
833 drm_helper_hpd_irq_event(sii902x->bridge.dev);
834
835 return IRQ_HANDLED;
836}
837
838/*
839 * The purpose of sii902x_i2c_bypass_select is to enable the pass through
840 * mode of the HDMI transmitter. Do not use regmap from within this function,
841 * only use sii902x_*_unlocked functions to read/modify/write registers.
842 * We are holding the parent adapter lock here, keep this in mind before
843 * adding more i2c transactions.
844 *
845 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
846 * in this driver, we need to make sure that we only touch 0x1A[2:1] from
847 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
848 * we leave the remaining bits as we have found them.
849 */
850static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
851{
852 struct sii902x *sii902x = i2c_mux_priv(mux);
853 struct device *dev = &sii902x->i2c->dev;
854 unsigned long timeout;
855 u8 status;
856 int ret;
857
858 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
859 SII902X_SYS_CTRL_DDC_BUS_REQ,
860 SII902X_SYS_CTRL_DDC_BUS_REQ);
861 if (ret)
862 return ret;
863
864 timeout = jiffies +
865 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
866 do {
867 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
868 &status);
869 if (ret)
870 return ret;
871 } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
872 time_before(jiffies, timeout));
873
874 if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
875 dev_err(dev, "Failed to acquire the i2c bus\n");
876 return -ETIMEDOUT;
877 }
878
879 return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
880 status);
881}
882
883/*
884 * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
885 * mode of the HDMI transmitter. Do not use regmap from within this function,
886 * only use sii902x_*_unlocked functions to read/modify/write registers.
887 * We are holding the parent adapter lock here, keep this in mind before
888 * adding more i2c transactions.
889 *
890 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
891 * in this driver, we need to make sure that we only touch 0x1A[2:1] from
892 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
893 * we leave the remaining bits as we have found them.
894 */
895static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
896{
897 struct sii902x *sii902x = i2c_mux_priv(mux);
898 struct device *dev = &sii902x->i2c->dev;
899 unsigned long timeout;
900 unsigned int retries;
901 u8 status;
902 int ret;
903
904 /*
905 * When the HDMI transmitter is in pass through mode, we need an
906 * (undocumented) additional delay between STOP and START conditions
907 * to guarantee the bus won't get stuck.
908 */
909 udelay(30);
910
911 /*
912 * Sometimes the I2C bus can stall after failure to use the
913 * EDID channel. Retry a few times to see if things clear
914 * up, else continue anyway.
915 */
916 retries = 5;
917 do {
918 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
919 &status);
920 retries--;
921 } while (ret && retries);
922 if (ret) {
923 dev_err(dev, "failed to read status (%d)\n", ret);
924 return ret;
925 }
926
927 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
928 SII902X_SYS_CTRL_DDC_BUS_REQ |
929 SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
930 if (ret)
931 return ret;
932
933 timeout = jiffies +
934 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
935 do {
936 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
937 &status);
938 if (ret)
939 return ret;
940 } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
941 SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
942 time_before(jiffies, timeout));
943
944 if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
945 SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
946 dev_err(dev, "failed to release the i2c bus\n");
947 return -ETIMEDOUT;
948 }
949
950 return 0;
951}
952
953static const struct drm_bridge_timings default_sii902x_timings = {
954 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
955 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
956 | DRM_BUS_FLAG_DE_HIGH,
957};
958
959static int sii902x_init(struct sii902x *sii902x)
960{
961 struct device *dev = &sii902x->i2c->dev;
962 unsigned int status = 0;
963 u8 chipid[4];
964 int ret;
965
966 sii902x_reset(sii902x);
967
968 ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
969 if (ret)
970 return ret;
971
972 ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
973 &chipid, 4);
974 if (ret) {
975 dev_err(dev, "regmap_read failed %d\n", ret);
976 return ret;
977 }
978
979 if (chipid[0] != 0xb0) {
980 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
981 chipid[0]);
982 return -EINVAL;
983 }
984
985 /* Clear all pending interrupts */
986 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
987 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
988
989 if (sii902x->i2c->irq > 0) {
990 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
991 SII902X_HOTPLUG_EVENT);
992
993 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL,
994 sii902x_interrupt,
995 IRQF_ONESHOT, dev_name(dev),
996 sii902x);
997 if (ret)
998 return ret;
999 }
1000
1001 sii902x->bridge.funcs = &sii902x_bridge_funcs;
1002 sii902x->bridge.of_node = dev->of_node;
1003 sii902x->bridge.timings = &default_sii902x_timings;
1004 drm_bridge_add(&sii902x->bridge);
1005
1006 sii902x_audio_codec_init(sii902x, dev);
1007
1008 i2c_set_clientdata(sii902x->i2c, sii902x);
1009
1010 sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev,
1011 1, 0, I2C_MUX_GATE,
1012 sii902x_i2c_bypass_select,
1013 sii902x_i2c_bypass_deselect);
1014 if (!sii902x->i2cmux)
1015 return -ENOMEM;
1016
1017 sii902x->i2cmux->priv = sii902x;
1018 return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);
1019}
1020
1021static int sii902x_probe(struct i2c_client *client,
1022 const struct i2c_device_id *id)
1023{
1024 struct device *dev = &client->dev;
1025 struct sii902x *sii902x;
1026 int ret;
1027
1028 ret = i2c_check_functionality(client->adapter,
1029 I2C_FUNC_SMBUS_BYTE_DATA);
1030 if (!ret) {
1031 dev_err(dev, "I2C adapter not suitable\n");
1032 return -EIO;
1033 }
1034
1035 sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
1036 if (!sii902x)
1037 return -ENOMEM;
1038
1039 sii902x->i2c = client;
1040 sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
1041 if (IS_ERR(sii902x->regmap))
1042 return PTR_ERR(sii902x->regmap);
1043
1044 sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1045 GPIOD_OUT_LOW);
1046 if (IS_ERR(sii902x->reset_gpio)) {
1047 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
1048 PTR_ERR(sii902x->reset_gpio));
1049 return PTR_ERR(sii902x->reset_gpio);
1050 }
1051
1052 mutex_init(&sii902x->mutex);
1053
1054 sii902x->supplies[0].supply = "iovcc";
1055 sii902x->supplies[1].supply = "cvcc12";
1056 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(sii902x->supplies),
1057 sii902x->supplies);
1058 if (ret < 0)
1059 return ret;
1060
1061 ret = regulator_bulk_enable(ARRAY_SIZE(sii902x->supplies),
1062 sii902x->supplies);
1063 if (ret < 0) {
1064 dev_err_probe(dev, ret, "Failed to enable supplies");
1065 return ret;
1066 }
1067
1068 ret = sii902x_init(sii902x);
1069 if (ret < 0) {
1070 regulator_bulk_disable(ARRAY_SIZE(sii902x->supplies),
1071 sii902x->supplies);
1072 }
1073
1074 return ret;
1075}
1076
1077static int sii902x_remove(struct i2c_client *client)
1078
1079{
1080 struct sii902x *sii902x = i2c_get_clientdata(client);
1081
1082 i2c_mux_del_adapters(sii902x->i2cmux);
1083 drm_bridge_remove(&sii902x->bridge);
1084 regulator_bulk_disable(ARRAY_SIZE(sii902x->supplies),
1085 sii902x->supplies);
1086
1087 return 0;
1088}
1089
1090static const struct of_device_id sii902x_dt_ids[] = {
1091 { .compatible = "sil,sii9022", },
1092 { }
1093};
1094MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1095
1096static const struct i2c_device_id sii902x_i2c_ids[] = {
1097 { "sii9022", 0 },
1098 { },
1099};
1100MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1101
1102static struct i2c_driver sii902x_driver = {
1103 .probe = sii902x_probe,
1104 .remove = sii902x_remove,
1105 .driver = {
1106 .name = "sii902x",
1107 .of_match_table = sii902x_dt_ids,
1108 },
1109 .id_table = sii902x_i2c_ids,
1110};
1111module_i2c_driver(sii902x_driver);
1112
1113MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
1114MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1115MODULE_LICENSE("GPL");