xref: /linux/drivers/gpu/drm/bridge/sii902x.c (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
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(&params->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