1 /*
2  * Analog Devices ADV7511 HDMI transmitter driver
3  *
4  * Copyright 2012 Analog Devices Inc.
5  *
6  * Licensed under the GPL-2.
7  */
8 
9 #include <linux/device.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/module.h>
12 #include <linux/of_device.h>
13 #include <linux/slab.h>
14 
15 #include <drm/drmP.h>
16 #include <drm/drm_atomic.h>
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_edid.h>
19 
20 #include "adv7511.h"
21 
22 /* ADI recommended values for proper operation. */
23 static const struct reg_sequence adv7511_fixed_registers[] = {
24 	{ 0x98, 0x03 },
25 	{ 0x9a, 0xe0 },
26 	{ 0x9c, 0x30 },
27 	{ 0x9d, 0x61 },
28 	{ 0xa2, 0xa4 },
29 	{ 0xa3, 0xa4 },
30 	{ 0xe0, 0xd0 },
31 	{ 0xf9, 0x00 },
32 	{ 0x55, 0x02 },
33 };
34 
35 /* -----------------------------------------------------------------------------
36  * Register access
37  */
38 
39 static const uint8_t adv7511_register_defaults[] = {
40 	0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 00 */
41 	0x00, 0x00, 0x01, 0x0e, 0xbc, 0x18, 0x01, 0x13,
42 	0x25, 0x37, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 10 */
43 	0x46, 0x62, 0x04, 0xa8, 0x00, 0x00, 0x1c, 0x84,
44 	0x1c, 0xbf, 0x04, 0xa8, 0x1e, 0x70, 0x02, 0x1e, /* 20 */
45 	0x00, 0x00, 0x04, 0xa8, 0x08, 0x12, 0x1b, 0xac,
46 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 30 */
47 	0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0xb0,
48 	0x00, 0x50, 0x90, 0x7e, 0x79, 0x70, 0x00, 0x00, /* 40 */
49 	0x00, 0xa8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
50 	0x00, 0x00, 0x02, 0x0d, 0x00, 0x00, 0x00, 0x00, /* 50 */
51 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
52 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 60 */
53 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
54 	0x01, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 70 */
55 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
56 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 80 */
57 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
58 	0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, /* 90 */
59 	0x0b, 0x02, 0x00, 0x18, 0x5a, 0x60, 0x00, 0x00,
60 	0x00, 0x00, 0x80, 0x80, 0x08, 0x04, 0x00, 0x00, /* a0 */
61 	0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x40, 0x14,
62 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* b0 */
63 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
64 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* c0 */
65 	0x00, 0x03, 0x00, 0x00, 0x02, 0x00, 0x01, 0x04,
66 	0x30, 0xff, 0x80, 0x80, 0x80, 0x00, 0x00, 0x00, /* d0 */
67 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x01,
68 	0x80, 0x75, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, /* e0 */
69 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
70 	0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x11, 0x00, /* f0 */
71 	0x00, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
72 };
73 
74 static bool adv7511_register_volatile(struct device *dev, unsigned int reg)
75 {
76 	switch (reg) {
77 	case ADV7511_REG_CHIP_REVISION:
78 	case ADV7511_REG_SPDIF_FREQ:
79 	case ADV7511_REG_CTS_AUTOMATIC1:
80 	case ADV7511_REG_CTS_AUTOMATIC2:
81 	case ADV7511_REG_VIC_DETECTED:
82 	case ADV7511_REG_VIC_SEND:
83 	case ADV7511_REG_AUX_VIC_DETECTED:
84 	case ADV7511_REG_STATUS:
85 	case ADV7511_REG_GC(1):
86 	case ADV7511_REG_INT(0):
87 	case ADV7511_REG_INT(1):
88 	case ADV7511_REG_PLL_STATUS:
89 	case ADV7511_REG_AN(0):
90 	case ADV7511_REG_AN(1):
91 	case ADV7511_REG_AN(2):
92 	case ADV7511_REG_AN(3):
93 	case ADV7511_REG_AN(4):
94 	case ADV7511_REG_AN(5):
95 	case ADV7511_REG_AN(6):
96 	case ADV7511_REG_AN(7):
97 	case ADV7511_REG_HDCP_STATUS:
98 	case ADV7511_REG_BCAPS:
99 	case ADV7511_REG_BKSV(0):
100 	case ADV7511_REG_BKSV(1):
101 	case ADV7511_REG_BKSV(2):
102 	case ADV7511_REG_BKSV(3):
103 	case ADV7511_REG_BKSV(4):
104 	case ADV7511_REG_DDC_STATUS:
105 	case ADV7511_REG_EDID_READ_CTRL:
106 	case ADV7511_REG_BSTATUS(0):
107 	case ADV7511_REG_BSTATUS(1):
108 	case ADV7511_REG_CHIP_ID_HIGH:
109 	case ADV7511_REG_CHIP_ID_LOW:
110 		return true;
111 	}
112 
113 	return false;
114 }
115 
116 static const struct regmap_config adv7511_regmap_config = {
117 	.reg_bits = 8,
118 	.val_bits = 8,
119 
120 	.max_register = 0xff,
121 	.cache_type = REGCACHE_RBTREE,
122 	.reg_defaults_raw = adv7511_register_defaults,
123 	.num_reg_defaults_raw = ARRAY_SIZE(adv7511_register_defaults),
124 
125 	.volatile_reg = adv7511_register_volatile,
126 };
127 
128 /* -----------------------------------------------------------------------------
129  * Hardware configuration
130  */
131 
132 static void adv7511_set_colormap(struct adv7511 *adv7511, bool enable,
133 				 const uint16_t *coeff,
134 				 unsigned int scaling_factor)
135 {
136 	unsigned int i;
137 
138 	regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(1),
139 			   ADV7511_CSC_UPDATE_MODE, ADV7511_CSC_UPDATE_MODE);
140 
141 	if (enable) {
142 		for (i = 0; i < 12; ++i) {
143 			regmap_update_bits(adv7511->regmap,
144 					   ADV7511_REG_CSC_UPPER(i),
145 					   0x1f, coeff[i] >> 8);
146 			regmap_write(adv7511->regmap,
147 				     ADV7511_REG_CSC_LOWER(i),
148 				     coeff[i] & 0xff);
149 		}
150 	}
151 
152 	if (enable)
153 		regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(0),
154 				   0xe0, 0x80 | (scaling_factor << 5));
155 	else
156 		regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(0),
157 				   0x80, 0x00);
158 
159 	regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(1),
160 			   ADV7511_CSC_UPDATE_MODE, 0);
161 }
162 
163 static int adv7511_packet_enable(struct adv7511 *adv7511, unsigned int packet)
164 {
165 	if (packet & 0xff)
166 		regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE0,
167 				   packet, 0xff);
168 
169 	if (packet & 0xff00) {
170 		packet >>= 8;
171 		regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
172 				   packet, 0xff);
173 	}
174 
175 	return 0;
176 }
177 
178 static int adv7511_packet_disable(struct adv7511 *adv7511, unsigned int packet)
179 {
180 	if (packet & 0xff)
181 		regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE0,
182 				   packet, 0x00);
183 
184 	if (packet & 0xff00) {
185 		packet >>= 8;
186 		regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
187 				   packet, 0x00);
188 	}
189 
190 	return 0;
191 }
192 
193 /* Coefficients for adv7511 color space conversion */
194 static const uint16_t adv7511_csc_ycbcr_to_rgb[] = {
195 	0x0734, 0x04ad, 0x0000, 0x1c1b,
196 	0x1ddc, 0x04ad, 0x1f24, 0x0135,
197 	0x0000, 0x04ad, 0x087c, 0x1b77,
198 };
199 
200 static void adv7511_set_config_csc(struct adv7511 *adv7511,
201 				   struct drm_connector *connector,
202 				   bool rgb)
203 {
204 	struct adv7511_video_config config;
205 	bool output_format_422, output_format_ycbcr;
206 	unsigned int mode;
207 	uint8_t infoframe[17];
208 
209 	if (adv7511->edid)
210 		config.hdmi_mode = drm_detect_hdmi_monitor(adv7511->edid);
211 	else
212 		config.hdmi_mode = false;
213 
214 	hdmi_avi_infoframe_init(&config.avi_infoframe);
215 
216 	config.avi_infoframe.scan_mode = HDMI_SCAN_MODE_UNDERSCAN;
217 
218 	if (rgb) {
219 		config.csc_enable = false;
220 		config.avi_infoframe.colorspace = HDMI_COLORSPACE_RGB;
221 	} else {
222 		config.csc_scaling_factor = ADV7511_CSC_SCALING_4;
223 		config.csc_coefficents = adv7511_csc_ycbcr_to_rgb;
224 
225 		if ((connector->display_info.color_formats &
226 		     DRM_COLOR_FORMAT_YCRCB422) &&
227 		    config.hdmi_mode) {
228 			config.csc_enable = false;
229 			config.avi_infoframe.colorspace =
230 				HDMI_COLORSPACE_YUV422;
231 		} else {
232 			config.csc_enable = true;
233 			config.avi_infoframe.colorspace = HDMI_COLORSPACE_RGB;
234 		}
235 	}
236 
237 	if (config.hdmi_mode) {
238 		mode = ADV7511_HDMI_CFG_MODE_HDMI;
239 
240 		switch (config.avi_infoframe.colorspace) {
241 		case HDMI_COLORSPACE_YUV444:
242 			output_format_422 = false;
243 			output_format_ycbcr = true;
244 			break;
245 		case HDMI_COLORSPACE_YUV422:
246 			output_format_422 = true;
247 			output_format_ycbcr = true;
248 			break;
249 		default:
250 			output_format_422 = false;
251 			output_format_ycbcr = false;
252 			break;
253 		}
254 	} else {
255 		mode = ADV7511_HDMI_CFG_MODE_DVI;
256 		output_format_422 = false;
257 		output_format_ycbcr = false;
258 	}
259 
260 	adv7511_packet_disable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
261 
262 	adv7511_set_colormap(adv7511, config.csc_enable,
263 			     config.csc_coefficents,
264 			     config.csc_scaling_factor);
265 
266 	regmap_update_bits(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG1, 0x81,
267 			   (output_format_422 << 7) | output_format_ycbcr);
268 
269 	regmap_update_bits(adv7511->regmap, ADV7511_REG_HDCP_HDMI_CFG,
270 			   ADV7511_HDMI_CFG_MODE_MASK, mode);
271 
272 	hdmi_avi_infoframe_pack(&config.avi_infoframe, infoframe,
273 				sizeof(infoframe));
274 
275 	/* The AVI infoframe id is not configurable */
276 	regmap_bulk_write(adv7511->regmap, ADV7511_REG_AVI_INFOFRAME_VERSION,
277 			  infoframe + 1, sizeof(infoframe) - 1);
278 
279 	adv7511_packet_enable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
280 }
281 
282 static void adv7511_set_link_config(struct adv7511 *adv7511,
283 				    const struct adv7511_link_config *config)
284 {
285 	/*
286 	 * The input style values documented in the datasheet don't match the
287 	 * hardware register field values :-(
288 	 */
289 	static const unsigned int input_styles[4] = { 0, 2, 1, 3 };
290 
291 	unsigned int clock_delay;
292 	unsigned int color_depth;
293 	unsigned int input_id;
294 
295 	clock_delay = (config->clock_delay + 1200) / 400;
296 	color_depth = config->input_color_depth == 8 ? 3
297 		    : (config->input_color_depth == 10 ? 1 : 2);
298 
299 	/* TODO Support input ID 6 */
300 	if (config->input_colorspace != HDMI_COLORSPACE_YUV422)
301 		input_id = config->input_clock == ADV7511_INPUT_CLOCK_DDR
302 			 ? 5 : 0;
303 	else if (config->input_clock == ADV7511_INPUT_CLOCK_DDR)
304 		input_id = config->embedded_sync ? 8 : 7;
305 	else if (config->input_clock == ADV7511_INPUT_CLOCK_2X)
306 		input_id = config->embedded_sync ? 4 : 3;
307 	else
308 		input_id = config->embedded_sync ? 2 : 1;
309 
310 	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG, 0xf,
311 			   input_id);
312 	regmap_update_bits(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG1, 0x7e,
313 			   (color_depth << 4) |
314 			   (input_styles[config->input_style] << 2));
315 	regmap_write(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG2,
316 		     config->input_justification << 3);
317 	regmap_write(adv7511->regmap, ADV7511_REG_TIMING_GEN_SEQ,
318 		     config->sync_pulse << 2);
319 
320 	regmap_write(adv7511->regmap, 0xba, clock_delay << 5);
321 
322 	adv7511->embedded_sync = config->embedded_sync;
323 	adv7511->hsync_polarity = config->hsync_polarity;
324 	adv7511->vsync_polarity = config->vsync_polarity;
325 	adv7511->rgb = config->input_colorspace == HDMI_COLORSPACE_RGB;
326 }
327 
328 static void adv7511_power_on(struct adv7511 *adv7511)
329 {
330 	adv7511->current_edid_segment = -1;
331 
332 	regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
333 			   ADV7511_POWER_POWER_DOWN, 0);
334 	if (adv7511->i2c_main->irq) {
335 		/*
336 		 * Documentation says the INT_ENABLE registers are reset in
337 		 * POWER_DOWN mode. My 7511w preserved the bits, however.
338 		 * Still, let's be safe and stick to the documentation.
339 		 */
340 		regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0),
341 			     ADV7511_INT0_EDID_READY);
342 		regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1),
343 			     ADV7511_INT1_DDC_ERROR);
344 	}
345 
346 	/*
347 	 * Per spec it is allowed to pulse the HPD signal to indicate that the
348 	 * EDID information has changed. Some monitors do this when they wakeup
349 	 * from standby or are enabled. When the HPD goes low the adv7511 is
350 	 * reset and the outputs are disabled which might cause the monitor to
351 	 * go to standby again. To avoid this we ignore the HPD pin for the
352 	 * first few seconds after enabling the output.
353 	 */
354 	regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
355 			   ADV7511_REG_POWER2_HPD_SRC_MASK,
356 			   ADV7511_REG_POWER2_HPD_SRC_NONE);
357 
358 	/*
359 	 * Most of the registers are reset during power down or when HPD is low.
360 	 */
361 	regcache_sync(adv7511->regmap);
362 
363 	if (adv7511->type == ADV7533)
364 		adv7533_dsi_power_on(adv7511);
365 
366 	adv7511->powered = true;
367 }
368 
369 static void adv7511_power_off(struct adv7511 *adv7511)
370 {
371 	/* TODO: setup additional power down modes */
372 	regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
373 			   ADV7511_POWER_POWER_DOWN,
374 			   ADV7511_POWER_POWER_DOWN);
375 	regcache_mark_dirty(adv7511->regmap);
376 
377 	if (adv7511->type == ADV7533)
378 		adv7533_dsi_power_off(adv7511);
379 
380 	adv7511->powered = false;
381 }
382 
383 /* -----------------------------------------------------------------------------
384  * Interrupt and hotplug detection
385  */
386 
387 static bool adv7511_hpd(struct adv7511 *adv7511)
388 {
389 	unsigned int irq0;
390 	int ret;
391 
392 	ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(0), &irq0);
393 	if (ret < 0)
394 		return false;
395 
396 	if (irq0 & ADV7511_INT0_HPD) {
397 		regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
398 			     ADV7511_INT0_HPD);
399 		return true;
400 	}
401 
402 	return false;
403 }
404 
405 static int adv7511_irq_process(struct adv7511 *adv7511, bool process_hpd)
406 {
407 	unsigned int irq0, irq1;
408 	int ret;
409 
410 	ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(0), &irq0);
411 	if (ret < 0)
412 		return ret;
413 
414 	ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(1), &irq1);
415 	if (ret < 0)
416 		return ret;
417 
418 	regmap_write(adv7511->regmap, ADV7511_REG_INT(0), irq0);
419 	regmap_write(adv7511->regmap, ADV7511_REG_INT(1), irq1);
420 
421 	if (process_hpd && irq0 & ADV7511_INT0_HPD && adv7511->bridge.encoder)
422 		drm_helper_hpd_irq_event(adv7511->connector.dev);
423 
424 	if (irq0 & ADV7511_INT0_EDID_READY || irq1 & ADV7511_INT1_DDC_ERROR) {
425 		adv7511->edid_read = true;
426 
427 		if (adv7511->i2c_main->irq)
428 			wake_up_all(&adv7511->wq);
429 	}
430 
431 	return 0;
432 }
433 
434 static irqreturn_t adv7511_irq_handler(int irq, void *devid)
435 {
436 	struct adv7511 *adv7511 = devid;
437 	int ret;
438 
439 	ret = adv7511_irq_process(adv7511, true);
440 	return ret < 0 ? IRQ_NONE : IRQ_HANDLED;
441 }
442 
443 /* -----------------------------------------------------------------------------
444  * EDID retrieval
445  */
446 
447 static int adv7511_wait_for_edid(struct adv7511 *adv7511, int timeout)
448 {
449 	int ret;
450 
451 	if (adv7511->i2c_main->irq) {
452 		ret = wait_event_interruptible_timeout(adv7511->wq,
453 				adv7511->edid_read, msecs_to_jiffies(timeout));
454 	} else {
455 		for (; timeout > 0; timeout -= 25) {
456 			ret = adv7511_irq_process(adv7511, false);
457 			if (ret < 0)
458 				break;
459 
460 			if (adv7511->edid_read)
461 				break;
462 
463 			msleep(25);
464 		}
465 	}
466 
467 	return adv7511->edid_read ? 0 : -EIO;
468 }
469 
470 static int adv7511_get_edid_block(void *data, u8 *buf, unsigned int block,
471 				  size_t len)
472 {
473 	struct adv7511 *adv7511 = data;
474 	struct i2c_msg xfer[2];
475 	uint8_t offset;
476 	unsigned int i;
477 	int ret;
478 
479 	if (len > 128)
480 		return -EINVAL;
481 
482 	if (adv7511->current_edid_segment != block / 2) {
483 		unsigned int status;
484 
485 		ret = regmap_read(adv7511->regmap, ADV7511_REG_DDC_STATUS,
486 				  &status);
487 		if (ret < 0)
488 			return ret;
489 
490 		if (status != 2) {
491 			adv7511->edid_read = false;
492 			regmap_write(adv7511->regmap, ADV7511_REG_EDID_SEGMENT,
493 				     block);
494 			ret = adv7511_wait_for_edid(adv7511, 200);
495 			if (ret < 0)
496 				return ret;
497 		}
498 
499 		/* Break this apart, hopefully more I2C controllers will
500 		 * support 64 byte transfers than 256 byte transfers
501 		 */
502 
503 		xfer[0].addr = adv7511->i2c_edid->addr;
504 		xfer[0].flags = 0;
505 		xfer[0].len = 1;
506 		xfer[0].buf = &offset;
507 		xfer[1].addr = adv7511->i2c_edid->addr;
508 		xfer[1].flags = I2C_M_RD;
509 		xfer[1].len = 64;
510 		xfer[1].buf = adv7511->edid_buf;
511 
512 		offset = 0;
513 
514 		for (i = 0; i < 4; ++i) {
515 			ret = i2c_transfer(adv7511->i2c_edid->adapter, xfer,
516 					   ARRAY_SIZE(xfer));
517 			if (ret < 0)
518 				return ret;
519 			else if (ret != 2)
520 				return -EIO;
521 
522 			xfer[1].buf += 64;
523 			offset += 64;
524 		}
525 
526 		adv7511->current_edid_segment = block / 2;
527 	}
528 
529 	if (block % 2 == 0)
530 		memcpy(buf, adv7511->edid_buf, len);
531 	else
532 		memcpy(buf, adv7511->edid_buf + 128, len);
533 
534 	return 0;
535 }
536 
537 /* -----------------------------------------------------------------------------
538  * ADV75xx helpers
539  */
540 
541 static int adv7511_get_modes(struct adv7511 *adv7511,
542 			     struct drm_connector *connector)
543 {
544 	struct edid *edid;
545 	unsigned int count;
546 
547 	/* Reading the EDID only works if the device is powered */
548 	if (!adv7511->powered) {
549 		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
550 				   ADV7511_POWER_POWER_DOWN, 0);
551 		if (adv7511->i2c_main->irq) {
552 			regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0),
553 				     ADV7511_INT0_EDID_READY);
554 			regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1),
555 				     ADV7511_INT1_DDC_ERROR);
556 		}
557 		adv7511->current_edid_segment = -1;
558 	}
559 
560 	edid = drm_do_get_edid(connector, adv7511_get_edid_block, adv7511);
561 
562 	if (!adv7511->powered)
563 		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
564 				   ADV7511_POWER_POWER_DOWN,
565 				   ADV7511_POWER_POWER_DOWN);
566 
567 	kfree(adv7511->edid);
568 	adv7511->edid = edid;
569 	if (!edid)
570 		return 0;
571 
572 	drm_mode_connector_update_edid_property(connector, edid);
573 	count = drm_add_edid_modes(connector, edid);
574 
575 	adv7511_set_config_csc(adv7511, connector, adv7511->rgb);
576 
577 	return count;
578 }
579 
580 static enum drm_connector_status
581 adv7511_detect(struct adv7511 *adv7511, struct drm_connector *connector)
582 {
583 	enum drm_connector_status status;
584 	unsigned int val;
585 	bool hpd;
586 	int ret;
587 
588 	ret = regmap_read(adv7511->regmap, ADV7511_REG_STATUS, &val);
589 	if (ret < 0)
590 		return connector_status_disconnected;
591 
592 	if (val & ADV7511_STATUS_HPD)
593 		status = connector_status_connected;
594 	else
595 		status = connector_status_disconnected;
596 
597 	hpd = adv7511_hpd(adv7511);
598 
599 	/* The chip resets itself when the cable is disconnected, so in case
600 	 * there is a pending HPD interrupt and the cable is connected there was
601 	 * at least one transition from disconnected to connected and the chip
602 	 * has to be reinitialized. */
603 	if (status == connector_status_connected && hpd && adv7511->powered) {
604 		regcache_mark_dirty(adv7511->regmap);
605 		adv7511_power_on(adv7511);
606 		adv7511_get_modes(adv7511, connector);
607 		if (adv7511->status == connector_status_connected)
608 			status = connector_status_disconnected;
609 	} else {
610 		/* Renable HPD sensing */
611 		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
612 				   ADV7511_REG_POWER2_HPD_SRC_MASK,
613 				   ADV7511_REG_POWER2_HPD_SRC_BOTH);
614 	}
615 
616 	adv7511->status = status;
617 	return status;
618 }
619 
620 static int adv7511_mode_valid(struct adv7511 *adv7511,
621 			      struct drm_display_mode *mode)
622 {
623 	if (mode->clock > 165000)
624 		return MODE_CLOCK_HIGH;
625 
626 	return MODE_OK;
627 }
628 
629 static void adv7511_mode_set(struct adv7511 *adv7511,
630 			     struct drm_display_mode *mode,
631 			     struct drm_display_mode *adj_mode)
632 {
633 	unsigned int low_refresh_rate;
634 	unsigned int hsync_polarity = 0;
635 	unsigned int vsync_polarity = 0;
636 
637 	if (adv7511->embedded_sync) {
638 		unsigned int hsync_offset, hsync_len;
639 		unsigned int vsync_offset, vsync_len;
640 
641 		hsync_offset = adj_mode->crtc_hsync_start -
642 			       adj_mode->crtc_hdisplay;
643 		vsync_offset = adj_mode->crtc_vsync_start -
644 			       adj_mode->crtc_vdisplay;
645 		hsync_len = adj_mode->crtc_hsync_end -
646 			    adj_mode->crtc_hsync_start;
647 		vsync_len = adj_mode->crtc_vsync_end -
648 			    adj_mode->crtc_vsync_start;
649 
650 		/* The hardware vsync generator has a off-by-one bug */
651 		vsync_offset += 1;
652 
653 		regmap_write(adv7511->regmap, ADV7511_REG_HSYNC_PLACEMENT_MSB,
654 			     ((hsync_offset >> 10) & 0x7) << 5);
655 		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(0),
656 			     (hsync_offset >> 2) & 0xff);
657 		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(1),
658 			     ((hsync_offset & 0x3) << 6) |
659 			     ((hsync_len >> 4) & 0x3f));
660 		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(2),
661 			     ((hsync_len & 0xf) << 4) |
662 			     ((vsync_offset >> 6) & 0xf));
663 		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(3),
664 			     ((vsync_offset & 0x3f) << 2) |
665 			     ((vsync_len >> 8) & 0x3));
666 		regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(4),
667 			     vsync_len & 0xff);
668 
669 		hsync_polarity = !(adj_mode->flags & DRM_MODE_FLAG_PHSYNC);
670 		vsync_polarity = !(adj_mode->flags & DRM_MODE_FLAG_PVSYNC);
671 	} else {
672 		enum adv7511_sync_polarity mode_hsync_polarity;
673 		enum adv7511_sync_polarity mode_vsync_polarity;
674 
675 		/**
676 		 * If the input signal is always low or always high we want to
677 		 * invert or let it passthrough depending on the polarity of the
678 		 * current mode.
679 		 **/
680 		if (adj_mode->flags & DRM_MODE_FLAG_NHSYNC)
681 			mode_hsync_polarity = ADV7511_SYNC_POLARITY_LOW;
682 		else
683 			mode_hsync_polarity = ADV7511_SYNC_POLARITY_HIGH;
684 
685 		if (adj_mode->flags & DRM_MODE_FLAG_NVSYNC)
686 			mode_vsync_polarity = ADV7511_SYNC_POLARITY_LOW;
687 		else
688 			mode_vsync_polarity = ADV7511_SYNC_POLARITY_HIGH;
689 
690 		if (adv7511->hsync_polarity != mode_hsync_polarity &&
691 		    adv7511->hsync_polarity !=
692 		    ADV7511_SYNC_POLARITY_PASSTHROUGH)
693 			hsync_polarity = 1;
694 
695 		if (adv7511->vsync_polarity != mode_vsync_polarity &&
696 		    adv7511->vsync_polarity !=
697 		    ADV7511_SYNC_POLARITY_PASSTHROUGH)
698 			vsync_polarity = 1;
699 	}
700 
701 	if (mode->vrefresh <= 24000)
702 		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_24HZ;
703 	else if (mode->vrefresh <= 25000)
704 		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_25HZ;
705 	else if (mode->vrefresh <= 30000)
706 		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_30HZ;
707 	else
708 		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_NONE;
709 
710 	regmap_update_bits(adv7511->regmap, 0xfb,
711 		0x6, low_refresh_rate << 1);
712 	regmap_update_bits(adv7511->regmap, 0x17,
713 		0x60, (vsync_polarity << 6) | (hsync_polarity << 5));
714 
715 	if (adv7511->type == ADV7533)
716 		adv7533_mode_set(adv7511, adj_mode);
717 
718 	drm_mode_copy(&adv7511->curr_mode, adj_mode);
719 
720 	/*
721 	 * TODO Test first order 4:2:2 to 4:4:4 up conversion method, which is
722 	 * supposed to give better results.
723 	 */
724 
725 	adv7511->f_tmds = mode->clock;
726 }
727 
728 /* Connector funcs */
729 static struct adv7511 *connector_to_adv7511(struct drm_connector *connector)
730 {
731 	return container_of(connector, struct adv7511, connector);
732 }
733 
734 static int adv7511_connector_get_modes(struct drm_connector *connector)
735 {
736 	struct adv7511 *adv = connector_to_adv7511(connector);
737 
738 	return adv7511_get_modes(adv, connector);
739 }
740 
741 static enum drm_mode_status
742 adv7511_connector_mode_valid(struct drm_connector *connector,
743 			     struct drm_display_mode *mode)
744 {
745 	struct adv7511 *adv = connector_to_adv7511(connector);
746 
747 	return adv7511_mode_valid(adv, mode);
748 }
749 
750 static struct drm_connector_helper_funcs adv7511_connector_helper_funcs = {
751 	.get_modes = adv7511_connector_get_modes,
752 	.mode_valid = adv7511_connector_mode_valid,
753 };
754 
755 static enum drm_connector_status
756 adv7511_connector_detect(struct drm_connector *connector, bool force)
757 {
758 	struct adv7511 *adv = connector_to_adv7511(connector);
759 
760 	return adv7511_detect(adv, connector);
761 }
762 
763 static struct drm_connector_funcs adv7511_connector_funcs = {
764 	.dpms = drm_atomic_helper_connector_dpms,
765 	.fill_modes = drm_helper_probe_single_connector_modes,
766 	.detect = adv7511_connector_detect,
767 	.destroy = drm_connector_cleanup,
768 	.reset = drm_atomic_helper_connector_reset,
769 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
770 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
771 };
772 
773 /* Bridge funcs */
774 static struct adv7511 *bridge_to_adv7511(struct drm_bridge *bridge)
775 {
776 	return container_of(bridge, struct adv7511, bridge);
777 }
778 
779 static void adv7511_bridge_enable(struct drm_bridge *bridge)
780 {
781 	struct adv7511 *adv = bridge_to_adv7511(bridge);
782 
783 	adv7511_power_on(adv);
784 }
785 
786 static void adv7511_bridge_disable(struct drm_bridge *bridge)
787 {
788 	struct adv7511 *adv = bridge_to_adv7511(bridge);
789 
790 	adv7511_power_off(adv);
791 }
792 
793 static void adv7511_bridge_mode_set(struct drm_bridge *bridge,
794 				    struct drm_display_mode *mode,
795 				    struct drm_display_mode *adj_mode)
796 {
797 	struct adv7511 *adv = bridge_to_adv7511(bridge);
798 
799 	adv7511_mode_set(adv, mode, adj_mode);
800 }
801 
802 static int adv7511_bridge_attach(struct drm_bridge *bridge)
803 {
804 	struct adv7511 *adv = bridge_to_adv7511(bridge);
805 	int ret;
806 
807 	if (!bridge->encoder) {
808 		DRM_ERROR("Parent encoder object not found");
809 		return -ENODEV;
810 	}
811 
812 	adv->connector.polled = DRM_CONNECTOR_POLL_HPD;
813 
814 	ret = drm_connector_init(bridge->dev, &adv->connector,
815 				 &adv7511_connector_funcs,
816 				 DRM_MODE_CONNECTOR_HDMIA);
817 	if (ret) {
818 		DRM_ERROR("Failed to initialize connector with drm\n");
819 		return ret;
820 	}
821 	drm_connector_helper_add(&adv->connector,
822 				 &adv7511_connector_helper_funcs);
823 	drm_mode_connector_attach_encoder(&adv->connector, bridge->encoder);
824 
825 	if (adv->type == ADV7533)
826 		ret = adv7533_attach_dsi(adv);
827 
828 	return ret;
829 }
830 
831 static struct drm_bridge_funcs adv7511_bridge_funcs = {
832 	.enable = adv7511_bridge_enable,
833 	.disable = adv7511_bridge_disable,
834 	.mode_set = adv7511_bridge_mode_set,
835 	.attach = adv7511_bridge_attach,
836 };
837 
838 /* -----------------------------------------------------------------------------
839  * Probe & remove
840  */
841 
842 static int adv7511_parse_dt(struct device_node *np,
843 			    struct adv7511_link_config *config)
844 {
845 	const char *str;
846 	int ret;
847 
848 	of_property_read_u32(np, "adi,input-depth", &config->input_color_depth);
849 	if (config->input_color_depth != 8 && config->input_color_depth != 10 &&
850 	    config->input_color_depth != 12)
851 		return -EINVAL;
852 
853 	ret = of_property_read_string(np, "adi,input-colorspace", &str);
854 	if (ret < 0)
855 		return ret;
856 
857 	if (!strcmp(str, "rgb"))
858 		config->input_colorspace = HDMI_COLORSPACE_RGB;
859 	else if (!strcmp(str, "yuv422"))
860 		config->input_colorspace = HDMI_COLORSPACE_YUV422;
861 	else if (!strcmp(str, "yuv444"))
862 		config->input_colorspace = HDMI_COLORSPACE_YUV444;
863 	else
864 		return -EINVAL;
865 
866 	ret = of_property_read_string(np, "adi,input-clock", &str);
867 	if (ret < 0)
868 		return ret;
869 
870 	if (!strcmp(str, "1x"))
871 		config->input_clock = ADV7511_INPUT_CLOCK_1X;
872 	else if (!strcmp(str, "2x"))
873 		config->input_clock = ADV7511_INPUT_CLOCK_2X;
874 	else if (!strcmp(str, "ddr"))
875 		config->input_clock = ADV7511_INPUT_CLOCK_DDR;
876 	else
877 		return -EINVAL;
878 
879 	if (config->input_colorspace == HDMI_COLORSPACE_YUV422 ||
880 	    config->input_clock != ADV7511_INPUT_CLOCK_1X) {
881 		ret = of_property_read_u32(np, "adi,input-style",
882 					   &config->input_style);
883 		if (ret)
884 			return ret;
885 
886 		if (config->input_style < 1 || config->input_style > 3)
887 			return -EINVAL;
888 
889 		ret = of_property_read_string(np, "adi,input-justification",
890 					      &str);
891 		if (ret < 0)
892 			return ret;
893 
894 		if (!strcmp(str, "left"))
895 			config->input_justification =
896 				ADV7511_INPUT_JUSTIFICATION_LEFT;
897 		else if (!strcmp(str, "evenly"))
898 			config->input_justification =
899 				ADV7511_INPUT_JUSTIFICATION_EVENLY;
900 		else if (!strcmp(str, "right"))
901 			config->input_justification =
902 				ADV7511_INPUT_JUSTIFICATION_RIGHT;
903 		else
904 			return -EINVAL;
905 
906 	} else {
907 		config->input_style = 1;
908 		config->input_justification = ADV7511_INPUT_JUSTIFICATION_LEFT;
909 	}
910 
911 	of_property_read_u32(np, "adi,clock-delay", &config->clock_delay);
912 	if (config->clock_delay < -1200 || config->clock_delay > 1600)
913 		return -EINVAL;
914 
915 	config->embedded_sync = of_property_read_bool(np, "adi,embedded-sync");
916 
917 	/* Hardcode the sync pulse configurations for now. */
918 	config->sync_pulse = ADV7511_INPUT_SYNC_PULSE_NONE;
919 	config->vsync_polarity = ADV7511_SYNC_POLARITY_PASSTHROUGH;
920 	config->hsync_polarity = ADV7511_SYNC_POLARITY_PASSTHROUGH;
921 
922 	return 0;
923 }
924 
925 static const int edid_i2c_addr = 0x7e;
926 static const int packet_i2c_addr = 0x70;
927 static const int cec_i2c_addr = 0x78;
928 
929 static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
930 {
931 	struct adv7511_link_config link_config;
932 	struct adv7511 *adv7511;
933 	struct device *dev = &i2c->dev;
934 	unsigned int val;
935 	int ret;
936 
937 	if (!dev->of_node)
938 		return -EINVAL;
939 
940 	adv7511 = devm_kzalloc(dev, sizeof(*adv7511), GFP_KERNEL);
941 	if (!adv7511)
942 		return -ENOMEM;
943 
944 	adv7511->powered = false;
945 	adv7511->status = connector_status_disconnected;
946 
947 	if (dev->of_node)
948 		adv7511->type = (enum adv7511_type)of_device_get_match_data(dev);
949 	else
950 		adv7511->type = id->driver_data;
951 
952 	memset(&link_config, 0, sizeof(link_config));
953 
954 	if (adv7511->type == ADV7511)
955 		ret = adv7511_parse_dt(dev->of_node, &link_config);
956 	else
957 		ret = adv7533_parse_dt(dev->of_node, adv7511);
958 	if (ret)
959 		return ret;
960 
961 	/*
962 	 * The power down GPIO is optional. If present, toggle it from active to
963 	 * inactive to wake up the encoder.
964 	 */
965 	adv7511->gpio_pd = devm_gpiod_get_optional(dev, "pd", GPIOD_OUT_HIGH);
966 	if (IS_ERR(adv7511->gpio_pd))
967 		return PTR_ERR(adv7511->gpio_pd);
968 
969 	if (adv7511->gpio_pd) {
970 		mdelay(5);
971 		gpiod_set_value_cansleep(adv7511->gpio_pd, 0);
972 	}
973 
974 	adv7511->regmap = devm_regmap_init_i2c(i2c, &adv7511_regmap_config);
975 	if (IS_ERR(adv7511->regmap))
976 		return PTR_ERR(adv7511->regmap);
977 
978 	ret = regmap_read(adv7511->regmap, ADV7511_REG_CHIP_REVISION, &val);
979 	if (ret)
980 		return ret;
981 	dev_dbg(dev, "Rev. %d\n", val);
982 
983 	if (adv7511->type == ADV7511)
984 		ret = regmap_register_patch(adv7511->regmap,
985 					    adv7511_fixed_registers,
986 					    ARRAY_SIZE(adv7511_fixed_registers));
987 	else
988 		ret = adv7533_patch_registers(adv7511);
989 	if (ret)
990 		return ret;
991 
992 	regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR, edid_i2c_addr);
993 	regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
994 		     packet_i2c_addr);
995 	regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR, cec_i2c_addr);
996 	adv7511_packet_disable(adv7511, 0xffff);
997 
998 	adv7511->i2c_main = i2c;
999 	adv7511->i2c_edid = i2c_new_dummy(i2c->adapter, edid_i2c_addr >> 1);
1000 	if (!adv7511->i2c_edid)
1001 		return -ENOMEM;
1002 
1003 	if (adv7511->type == ADV7533) {
1004 		ret = adv7533_init_cec(adv7511);
1005 		if (ret)
1006 			goto err_i2c_unregister_edid;
1007 	}
1008 
1009 	if (i2c->irq) {
1010 		init_waitqueue_head(&adv7511->wq);
1011 
1012 		ret = devm_request_threaded_irq(dev, i2c->irq, NULL,
1013 						adv7511_irq_handler,
1014 						IRQF_ONESHOT, dev_name(dev),
1015 						adv7511);
1016 		if (ret)
1017 			goto err_unregister_cec;
1018 	}
1019 
1020 	/* CEC is unused for now */
1021 	regmap_write(adv7511->regmap, ADV7511_REG_CEC_CTRL,
1022 		     ADV7511_CEC_CTRL_POWER_DOWN);
1023 
1024 	adv7511_power_off(adv7511);
1025 
1026 	i2c_set_clientdata(i2c, adv7511);
1027 
1028 	if (adv7511->type == ADV7511)
1029 		adv7511_set_link_config(adv7511, &link_config);
1030 
1031 	adv7511->bridge.funcs = &adv7511_bridge_funcs;
1032 	adv7511->bridge.of_node = dev->of_node;
1033 
1034 	ret = drm_bridge_add(&adv7511->bridge);
1035 	if (ret) {
1036 		dev_err(dev, "failed to add adv7511 bridge\n");
1037 		goto err_unregister_cec;
1038 	}
1039 
1040 	return 0;
1041 
1042 err_unregister_cec:
1043 	adv7533_uninit_cec(adv7511);
1044 err_i2c_unregister_edid:
1045 	i2c_unregister_device(adv7511->i2c_edid);
1046 
1047 	return ret;
1048 }
1049 
1050 static int adv7511_remove(struct i2c_client *i2c)
1051 {
1052 	struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
1053 
1054 	if (adv7511->type == ADV7533) {
1055 		adv7533_detach_dsi(adv7511);
1056 		adv7533_uninit_cec(adv7511);
1057 	}
1058 
1059 	drm_bridge_remove(&adv7511->bridge);
1060 
1061 	i2c_unregister_device(adv7511->i2c_edid);
1062 
1063 	kfree(adv7511->edid);
1064 
1065 	return 0;
1066 }
1067 
1068 static const struct i2c_device_id adv7511_i2c_ids[] = {
1069 	{ "adv7511", ADV7511 },
1070 	{ "adv7511w", ADV7511 },
1071 	{ "adv7513", ADV7511 },
1072 #ifdef CONFIG_DRM_I2C_ADV7533
1073 	{ "adv7533", ADV7533 },
1074 #endif
1075 	{ }
1076 };
1077 MODULE_DEVICE_TABLE(i2c, adv7511_i2c_ids);
1078 
1079 static const struct of_device_id adv7511_of_ids[] = {
1080 	{ .compatible = "adi,adv7511", .data = (void *)ADV7511 },
1081 	{ .compatible = "adi,adv7511w", .data = (void *)ADV7511 },
1082 	{ .compatible = "adi,adv7513", .data = (void *)ADV7511 },
1083 #ifdef CONFIG_DRM_I2C_ADV7533
1084 	{ .compatible = "adi,adv7533", .data = (void *)ADV7533 },
1085 #endif
1086 	{ }
1087 };
1088 MODULE_DEVICE_TABLE(of, adv7511_of_ids);
1089 
1090 static struct mipi_dsi_driver adv7533_dsi_driver = {
1091 	.driver.name = "adv7533",
1092 };
1093 
1094 static struct i2c_driver adv7511_driver = {
1095 	.driver = {
1096 		.name = "adv7511",
1097 		.of_match_table = adv7511_of_ids,
1098 	},
1099 	.id_table = adv7511_i2c_ids,
1100 	.probe = adv7511_probe,
1101 	.remove = adv7511_remove,
1102 };
1103 
1104 static int __init adv7511_init(void)
1105 {
1106 	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
1107 		mipi_dsi_driver_register(&adv7533_dsi_driver);
1108 
1109 	return i2c_add_driver(&adv7511_driver);
1110 }
1111 module_init(adv7511_init);
1112 
1113 static void __exit adv7511_exit(void)
1114 {
1115 	i2c_del_driver(&adv7511_driver);
1116 
1117 	if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
1118 		mipi_dsi_driver_unregister(&adv7533_dsi_driver);
1119 }
1120 module_exit(adv7511_exit);
1121 
1122 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
1123 MODULE_DESCRIPTION("ADV7511 HDMI transmitter driver");
1124 MODULE_LICENSE("GPL");
1125