xref: /linux/drivers/gpu/drm/bridge/lontium-lt9611.c (revision b8fc42dc065742bc68df6a61a2aff8cbe364fa17)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4  * Copyright (c) 2019-2020. Linaro Limited.
5  */
6 
7 #include <linux/gpio/consumer.h>
8 #include <linux/i2c.h>
9 #include <linux/interrupt.h>
10 #include <linux/media-bus-format.h>
11 #include <linux/module.h>
12 #include <linux/of_graph.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15 #include <linux/regulator/consumer.h>
16 
17 #include <sound/hdmi-codec.h>
18 
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_bridge.h>
21 #include <drm/drm_edid.h>
22 #include <drm/drm_mipi_dsi.h>
23 #include <drm/drm_of.h>
24 #include <drm/drm_print.h>
25 #include <drm/drm_probe_helper.h>
26 
27 #define EDID_SEG_SIZE	256
28 #define EDID_LEN	32
29 #define EDID_LOOP	8
30 #define KEY_DDC_ACCS_DONE 0x02
31 #define DDC_NO_ACK	0x50
32 
33 #define LT9611_4LANES	0
34 
35 struct lt9611 {
36 	struct device *dev;
37 	struct drm_bridge bridge;
38 	struct drm_bridge *next_bridge;
39 
40 	struct regmap *regmap;
41 
42 	struct device_node *dsi0_node;
43 	struct device_node *dsi1_node;
44 	struct mipi_dsi_device *dsi0;
45 	struct mipi_dsi_device *dsi1;
46 	struct platform_device *audio_pdev;
47 
48 	bool ac_mode;
49 
50 	struct gpio_desc *reset_gpio;
51 	struct gpio_desc *enable_gpio;
52 
53 	bool power_on;
54 	bool sleep;
55 
56 	struct regulator_bulk_data supplies[2];
57 
58 	struct i2c_client *client;
59 
60 	enum drm_connector_status status;
61 
62 	u8 edid_buf[EDID_SEG_SIZE];
63 };
64 
65 #define LT9611_PAGE_CONTROL	0xff
66 
67 static const struct regmap_range_cfg lt9611_ranges[] = {
68 	{
69 		.name = "register_range",
70 		.range_min =  0,
71 		.range_max = 0x85ff,
72 		.selector_reg = LT9611_PAGE_CONTROL,
73 		.selector_mask = 0xff,
74 		.selector_shift = 0,
75 		.window_start = 0,
76 		.window_len = 0x100,
77 	},
78 };
79 
80 static const struct regmap_config lt9611_regmap_config = {
81 	.reg_bits = 8,
82 	.val_bits = 8,
83 	.max_register = 0xffff,
84 	.ranges = lt9611_ranges,
85 	.num_ranges = ARRAY_SIZE(lt9611_ranges),
86 };
87 
88 static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
89 {
90 	return container_of(bridge, struct lt9611, bridge);
91 }
92 
93 static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
94 {
95 	const struct reg_sequence reg_cfg[] = {
96 		{ 0x8106, 0x40 }, /* port A rx current */
97 		{ 0x810a, 0xfe }, /* port A ldo voltage set */
98 		{ 0x810b, 0xbf }, /* enable port A lprx */
99 		{ 0x8111, 0x40 }, /* port B rx current */
100 		{ 0x8115, 0xfe }, /* port B ldo voltage set */
101 		{ 0x8116, 0xbf }, /* enable port B lprx */
102 
103 		{ 0x811c, 0x03 }, /* PortA clk lane no-LP mode */
104 		{ 0x8120, 0x03 }, /* PortB clk lane with-LP mode */
105 	};
106 
107 	return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
108 }
109 
110 static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
111 				     const struct drm_display_mode *mode)
112 {
113 	struct reg_sequence reg_cfg[] = {
114 		{ 0x8300, LT9611_4LANES },
115 		{ 0x830a, 0x00 },
116 		{ 0x824f, 0x80 },
117 		{ 0x8250, 0x10 },
118 		{ 0x8302, 0x0a },
119 		{ 0x8306, 0x0a },
120 	};
121 
122 	if (lt9611->dsi1_node)
123 		reg_cfg[1].def = 0x03;
124 
125 	return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
126 }
127 
128 static void lt9611_mipi_video_setup(struct lt9611 *lt9611,
129 				    const struct drm_display_mode *mode)
130 {
131 	u32 h_total, hactive, hsync_len, hfront_porch, hsync_porch;
132 	u32 v_total, vactive, vsync_len, vfront_porch, vsync_porch;
133 
134 	h_total = mode->htotal;
135 	v_total = mode->vtotal;
136 
137 	hactive = mode->hdisplay;
138 	hsync_len = mode->hsync_end - mode->hsync_start;
139 	hfront_porch = mode->hsync_start - mode->hdisplay;
140 	hsync_porch = mode->htotal - mode->hsync_start;
141 
142 	vactive = mode->vdisplay;
143 	vsync_len = mode->vsync_end - mode->vsync_start;
144 	vfront_porch = mode->vsync_start - mode->vdisplay;
145 	vsync_porch = mode->vtotal - mode->vsync_start;
146 
147 	regmap_write(lt9611->regmap, 0x830d, (u8)(v_total / 256));
148 	regmap_write(lt9611->regmap, 0x830e, (u8)(v_total % 256));
149 
150 	regmap_write(lt9611->regmap, 0x830f, (u8)(vactive / 256));
151 	regmap_write(lt9611->regmap, 0x8310, (u8)(vactive % 256));
152 
153 	regmap_write(lt9611->regmap, 0x8311, (u8)(h_total / 256));
154 	regmap_write(lt9611->regmap, 0x8312, (u8)(h_total % 256));
155 
156 	regmap_write(lt9611->regmap, 0x8313, (u8)(hactive / 256));
157 	regmap_write(lt9611->regmap, 0x8314, (u8)(hactive % 256));
158 
159 	regmap_write(lt9611->regmap, 0x8315, (u8)(vsync_len % 256));
160 	regmap_write(lt9611->regmap, 0x8316, (u8)(hsync_len % 256));
161 
162 	regmap_write(lt9611->regmap, 0x8317, (u8)(vfront_porch % 256));
163 
164 	regmap_write(lt9611->regmap, 0x8318, (u8)(vsync_porch % 256));
165 
166 	regmap_write(lt9611->regmap, 0x8319, (u8)(hfront_porch % 256));
167 
168 	regmap_write(lt9611->regmap, 0x831a, (u8)(hsync_porch / 256) |
169 						((hfront_porch / 256) << 4));
170 	regmap_write(lt9611->regmap, 0x831b, (u8)(hsync_porch % 256));
171 }
172 
173 static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode, unsigned int postdiv)
174 {
175 	unsigned int pcr_m = mode->clock * 5 * postdiv / 27000;
176 	const struct reg_sequence reg_cfg[] = {
177 		{ 0x830b, 0x01 },
178 		{ 0x830c, 0x10 },
179 		{ 0x8348, 0x00 },
180 		{ 0x8349, 0x81 },
181 
182 		/* stage 1 */
183 		{ 0x8321, 0x4a },
184 		{ 0x8324, 0x71 },
185 		{ 0x8325, 0x30 },
186 		{ 0x832a, 0x01 },
187 
188 		/* stage 2 */
189 		{ 0x834a, 0x40 },
190 
191 		/* MK limit */
192 		{ 0x832d, 0x38 },
193 		{ 0x8331, 0x08 },
194 	};
195 	u8 pol = 0x10;
196 
197 	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
198 		pol |= 0x2;
199 	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
200 		pol |= 0x1;
201 	regmap_write(lt9611->regmap, 0x831d, pol);
202 
203 	regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
204 	if (lt9611->dsi1_node) {
205 		unsigned int hact = mode->hdisplay;
206 
207 		hact >>= 2;
208 		hact += 0x50;
209 		hact = min(hact, 0x3e0U);
210 		regmap_write(lt9611->regmap, 0x830b, hact / 256);
211 		regmap_write(lt9611->regmap, 0x830c, hact % 256);
212 		regmap_write(lt9611->regmap, 0x8348, hact / 256);
213 		regmap_write(lt9611->regmap, 0x8349, hact % 256);
214 	}
215 
216 	regmap_write(lt9611->regmap, 0x8326, pcr_m);
217 
218 	/* pcr rst */
219 	regmap_write(lt9611->regmap, 0x8011, 0x5a);
220 	regmap_write(lt9611->regmap, 0x8011, 0xfa);
221 }
222 
223 static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode, unsigned int *postdiv)
224 {
225 	unsigned int pclk = mode->clock;
226 	const struct reg_sequence reg_cfg[] = {
227 		/* txpll init */
228 		{ 0x8123, 0x40 },
229 		{ 0x8124, 0x64 },
230 		{ 0x8125, 0x80 },
231 		{ 0x8126, 0x55 },
232 		{ 0x812c, 0x37 },
233 		{ 0x812f, 0x01 },
234 		{ 0x8126, 0x55 },
235 		{ 0x8127, 0x66 },
236 		{ 0x8128, 0x88 },
237 		{ 0x812a, 0x20 },
238 	};
239 
240 	regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
241 
242 	if (pclk > 150000) {
243 		regmap_write(lt9611->regmap, 0x812d, 0x88);
244 		*postdiv = 1;
245 	} else if (pclk > 70000) {
246 		regmap_write(lt9611->regmap, 0x812d, 0x99);
247 		*postdiv = 2;
248 	} else {
249 		regmap_write(lt9611->regmap, 0x812d, 0xaa);
250 		*postdiv = 4;
251 	}
252 
253 	/*
254 	 * first divide pclk by 2 first
255 	 *  - write divide by 64k to 19:16 bits which means shift by 17
256 	 *  - write divide by 256 to 15:8 bits which means shift by 9
257 	 *  - write remainder to 7:0 bits, which means shift by 1
258 	 */
259 	regmap_write(lt9611->regmap, 0x82e3, pclk >> 17); /* pclk[19:16] */
260 	regmap_write(lt9611->regmap, 0x82e4, pclk >> 9);  /* pclk[15:8]  */
261 	regmap_write(lt9611->regmap, 0x82e5, pclk >> 1);  /* pclk[7:0]   */
262 
263 	regmap_write(lt9611->regmap, 0x82de, 0x20);
264 	regmap_write(lt9611->regmap, 0x82de, 0xe0);
265 
266 	regmap_write(lt9611->regmap, 0x8016, 0xf1);
267 	regmap_write(lt9611->regmap, 0x8016, 0xf3);
268 
269 	return 0;
270 }
271 
272 static int lt9611_read_video_check(struct lt9611 *lt9611, unsigned int reg)
273 {
274 	unsigned int temp, temp2;
275 	int ret;
276 
277 	ret = regmap_read(lt9611->regmap, reg, &temp);
278 	if (ret)
279 		return ret;
280 	temp <<= 8;
281 	ret = regmap_read(lt9611->regmap, reg + 1, &temp2);
282 	if (ret)
283 		return ret;
284 
285 	return (temp + temp2);
286 }
287 
288 static int lt9611_video_check(struct lt9611 *lt9611)
289 {
290 	u32 v_total, vactive, hactive_a, hactive_b, h_total_sysclk;
291 	int temp;
292 
293 	/* top module video check */
294 
295 	/* vactive */
296 	temp = lt9611_read_video_check(lt9611, 0x8282);
297 	if (temp < 0)
298 		goto end;
299 	vactive = temp;
300 
301 	/* v_total */
302 	temp = lt9611_read_video_check(lt9611, 0x826c);
303 	if (temp < 0)
304 		goto end;
305 	v_total = temp;
306 
307 	/* h_total_sysclk */
308 	temp = lt9611_read_video_check(lt9611, 0x8286);
309 	if (temp < 0)
310 		goto end;
311 	h_total_sysclk = temp;
312 
313 	/* hactive_a */
314 	temp = lt9611_read_video_check(lt9611, 0x8382);
315 	if (temp < 0)
316 		goto end;
317 	hactive_a = temp / 3;
318 
319 	/* hactive_b */
320 	temp = lt9611_read_video_check(lt9611, 0x8386);
321 	if (temp < 0)
322 		goto end;
323 	hactive_b = temp / 3;
324 
325 	dev_info(lt9611->dev,
326 		 "video check: hactive_a=%d, hactive_b=%d, vactive=%d, v_total=%d, h_total_sysclk=%d\n",
327 		 hactive_a, hactive_b, vactive, v_total, h_total_sysclk);
328 
329 	return 0;
330 
331 end:
332 	dev_err(lt9611->dev, "read video check error\n");
333 	return temp;
334 }
335 
336 static void lt9611_hdmi_set_infoframes(struct lt9611 *lt9611,
337 				       struct drm_connector *connector,
338 				       struct drm_display_mode *mode)
339 {
340 	union hdmi_infoframe infoframe;
341 	ssize_t len;
342 	u8 iframes = 0x0a; /* UD1 infoframe */
343 	u8 buf[32];
344 	int ret;
345 	int i;
346 
347 	ret = drm_hdmi_avi_infoframe_from_display_mode(&infoframe.avi,
348 						       connector,
349 						       mode);
350 	if (ret < 0)
351 		goto out;
352 
353 	len = hdmi_infoframe_pack(&infoframe, buf, sizeof(buf));
354 	if (len < 0)
355 		goto out;
356 
357 	for (i = 0; i < len; i++)
358 		regmap_write(lt9611->regmap, 0x8440 + i, buf[i]);
359 
360 	ret = drm_hdmi_vendor_infoframe_from_display_mode(&infoframe.vendor.hdmi,
361 							  connector,
362 							  mode);
363 	if (ret < 0)
364 		goto out;
365 
366 	len = hdmi_infoframe_pack(&infoframe, buf, sizeof(buf));
367 	if (len < 0)
368 		goto out;
369 
370 	for (i = 0; i < len; i++)
371 		regmap_write(lt9611->regmap, 0x8474 + i, buf[i]);
372 
373 	iframes |= 0x20;
374 
375 out:
376 	regmap_write(lt9611->regmap, 0x843d, iframes); /* UD1 infoframe */
377 }
378 
379 static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611, bool is_hdmi)
380 {
381 	if (is_hdmi)
382 		regmap_write(lt9611->regmap, 0x82d6, 0x8c);
383 	else
384 		regmap_write(lt9611->regmap, 0x82d6, 0x0c);
385 	regmap_write(lt9611->regmap, 0x82d7, 0x04);
386 }
387 
388 static void lt9611_hdmi_tx_phy(struct lt9611 *lt9611)
389 {
390 	struct reg_sequence reg_cfg[] = {
391 		{ 0x8130, 0x6a },
392 		{ 0x8131, 0x44 }, /* HDMI DC mode */
393 		{ 0x8132, 0x4a },
394 		{ 0x8133, 0x0b },
395 		{ 0x8134, 0x00 },
396 		{ 0x8135, 0x00 },
397 		{ 0x8136, 0x00 },
398 		{ 0x8137, 0x44 },
399 		{ 0x813f, 0x0f },
400 		{ 0x8140, 0xa0 },
401 		{ 0x8141, 0xa0 },
402 		{ 0x8142, 0xa0 },
403 		{ 0x8143, 0xa0 },
404 		{ 0x8144, 0x0a },
405 	};
406 
407 	/* HDMI AC mode */
408 	if (lt9611->ac_mode)
409 		reg_cfg[2].def = 0x73;
410 
411 	regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
412 }
413 
414 static irqreturn_t lt9611_irq_thread_handler(int irq, void *dev_id)
415 {
416 	struct lt9611 *lt9611 = dev_id;
417 	unsigned int irq_flag0 = 0;
418 	unsigned int irq_flag3 = 0;
419 
420 	regmap_read(lt9611->regmap, 0x820f, &irq_flag3);
421 	regmap_read(lt9611->regmap, 0x820c, &irq_flag0);
422 
423 	/* hpd changed low */
424 	if (irq_flag3 & 0x80) {
425 		dev_info(lt9611->dev, "hdmi cable disconnected\n");
426 
427 		regmap_write(lt9611->regmap, 0x8207, 0xbf);
428 		regmap_write(lt9611->regmap, 0x8207, 0x3f);
429 	}
430 
431 	/* hpd changed high */
432 	if (irq_flag3 & 0x40) {
433 		dev_info(lt9611->dev, "hdmi cable connected\n");
434 
435 		regmap_write(lt9611->regmap, 0x8207, 0x7f);
436 		regmap_write(lt9611->regmap, 0x8207, 0x3f);
437 	}
438 
439 	if (irq_flag3 & 0xc0 && lt9611->bridge.dev)
440 		drm_kms_helper_hotplug_event(lt9611->bridge.dev);
441 
442 	/* video input changed */
443 	if (irq_flag0 & 0x01) {
444 		dev_info(lt9611->dev, "video input changed\n");
445 		regmap_write(lt9611->regmap, 0x829e, 0xff);
446 		regmap_write(lt9611->regmap, 0x829e, 0xf7);
447 		regmap_write(lt9611->regmap, 0x8204, 0xff);
448 		regmap_write(lt9611->regmap, 0x8204, 0xfe);
449 	}
450 
451 	return IRQ_HANDLED;
452 }
453 
454 static void lt9611_enable_hpd_interrupts(struct lt9611 *lt9611)
455 {
456 	unsigned int val;
457 
458 	regmap_read(lt9611->regmap, 0x8203, &val);
459 
460 	val &= ~0xc0;
461 	regmap_write(lt9611->regmap, 0x8203, val);
462 	regmap_write(lt9611->regmap, 0x8207, 0xff); /* clear */
463 	regmap_write(lt9611->regmap, 0x8207, 0x3f);
464 }
465 
466 static void lt9611_sleep_setup(struct lt9611 *lt9611)
467 {
468 	const struct reg_sequence sleep_setup[] = {
469 		{ 0x8024, 0x76 },
470 		{ 0x8023, 0x01 },
471 		{ 0x8157, 0x03 }, /* set addr pin as output */
472 		{ 0x8149, 0x0b },
473 
474 		{ 0x8102, 0x48 }, /* MIPI Rx power down */
475 		{ 0x8123, 0x80 },
476 		{ 0x8130, 0x00 },
477 		{ 0x8011, 0x0a },
478 	};
479 
480 	regmap_multi_reg_write(lt9611->regmap,
481 			       sleep_setup, ARRAY_SIZE(sleep_setup));
482 	lt9611->sleep = true;
483 }
484 
485 static int lt9611_power_on(struct lt9611 *lt9611)
486 {
487 	int ret;
488 	const struct reg_sequence seq[] = {
489 		/* LT9611_System_Init */
490 		{ 0x8101, 0x18 }, /* sel xtal clock */
491 
492 		/* timer for frequency meter */
493 		{ 0x821b, 0x69 }, /* timer 2 */
494 		{ 0x821c, 0x78 },
495 		{ 0x82cb, 0x69 }, /* timer 1 */
496 		{ 0x82cc, 0x78 },
497 
498 		/* irq init */
499 		{ 0x8251, 0x01 },
500 		{ 0x8258, 0x0a }, /* hpd irq */
501 		{ 0x8259, 0x80 }, /* hpd debounce width */
502 		{ 0x829e, 0xf7 }, /* video check irq */
503 
504 		/* power consumption for work */
505 		{ 0x8004, 0xf0 },
506 		{ 0x8006, 0xf0 },
507 		{ 0x800a, 0x80 },
508 		{ 0x800b, 0x40 },
509 		{ 0x800d, 0xef },
510 		{ 0x8011, 0xfa },
511 	};
512 
513 	if (lt9611->power_on)
514 		return 0;
515 
516 	ret = regmap_multi_reg_write(lt9611->regmap, seq, ARRAY_SIZE(seq));
517 	if (!ret)
518 		lt9611->power_on = true;
519 
520 	return ret;
521 }
522 
523 static int lt9611_power_off(struct lt9611 *lt9611)
524 {
525 	int ret;
526 
527 	ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
528 	if (!ret)
529 		lt9611->power_on = false;
530 
531 	return ret;
532 }
533 
534 static void lt9611_reset(struct lt9611 *lt9611)
535 {
536 	gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
537 	msleep(20);
538 
539 	gpiod_set_value_cansleep(lt9611->reset_gpio, 0);
540 	msleep(20);
541 
542 	gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
543 	msleep(100);
544 }
545 
546 static void lt9611_assert_5v(struct lt9611 *lt9611)
547 {
548 	if (!lt9611->enable_gpio)
549 		return;
550 
551 	gpiod_set_value_cansleep(lt9611->enable_gpio, 1);
552 	msleep(20);
553 }
554 
555 static int lt9611_regulator_init(struct lt9611 *lt9611)
556 {
557 	int ret;
558 
559 	lt9611->supplies[0].supply = "vdd";
560 	lt9611->supplies[1].supply = "vcc";
561 
562 	ret = devm_regulator_bulk_get(lt9611->dev, 2, lt9611->supplies);
563 	if (ret < 0)
564 		return ret;
565 
566 	return regulator_set_load(lt9611->supplies[0].consumer, 300000);
567 }
568 
569 static int lt9611_regulator_enable(struct lt9611 *lt9611)
570 {
571 	int ret;
572 
573 	ret = regulator_enable(lt9611->supplies[0].consumer);
574 	if (ret < 0)
575 		return ret;
576 
577 	usleep_range(1000, 10000);
578 
579 	ret = regulator_enable(lt9611->supplies[1].consumer);
580 	if (ret < 0) {
581 		regulator_disable(lt9611->supplies[0].consumer);
582 		return ret;
583 	}
584 
585 	return 0;
586 }
587 
588 static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
589 {
590 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
591 	unsigned int reg_val = 0;
592 	int connected = 0;
593 
594 	regmap_read(lt9611->regmap, 0x825e, &reg_val);
595 	connected  = (reg_val & (BIT(2) | BIT(0)));
596 
597 	lt9611->status = connected ?  connector_status_connected :
598 				connector_status_disconnected;
599 
600 	return lt9611->status;
601 }
602 
603 static int lt9611_read_edid(struct lt9611 *lt9611)
604 {
605 	unsigned int temp;
606 	int ret = 0;
607 	int i, j;
608 
609 	/* memset to clear old buffer, if any */
610 	memset(lt9611->edid_buf, 0, sizeof(lt9611->edid_buf));
611 
612 	regmap_write(lt9611->regmap, 0x8503, 0xc9);
613 
614 	/* 0xA0 is EDID device address */
615 	regmap_write(lt9611->regmap, 0x8504, 0xa0);
616 	/* 0x00 is EDID offset address */
617 	regmap_write(lt9611->regmap, 0x8505, 0x00);
618 
619 	/* length for read */
620 	regmap_write(lt9611->regmap, 0x8506, EDID_LEN);
621 	regmap_write(lt9611->regmap, 0x8514, 0x7f);
622 
623 	for (i = 0; i < EDID_LOOP; i++) {
624 		/* offset address */
625 		regmap_write(lt9611->regmap, 0x8505, i * EDID_LEN);
626 		regmap_write(lt9611->regmap, 0x8507, 0x36);
627 		regmap_write(lt9611->regmap, 0x8507, 0x31);
628 		regmap_write(lt9611->regmap, 0x8507, 0x37);
629 		usleep_range(5000, 10000);
630 
631 		regmap_read(lt9611->regmap, 0x8540, &temp);
632 
633 		if (temp & KEY_DDC_ACCS_DONE) {
634 			for (j = 0; j < EDID_LEN; j++) {
635 				regmap_read(lt9611->regmap, 0x8583, &temp);
636 				lt9611->edid_buf[i * EDID_LEN + j] = temp;
637 			}
638 
639 		} else if (temp & DDC_NO_ACK) { /* DDC No Ack or Abitration lost */
640 			dev_err(lt9611->dev, "read edid failed: no ack\n");
641 			ret = -EIO;
642 			goto end;
643 
644 		} else {
645 			dev_err(lt9611->dev, "read edid failed: access not done\n");
646 			ret = -EIO;
647 			goto end;
648 		}
649 	}
650 
651 end:
652 	regmap_write(lt9611->regmap, 0x8507, 0x1f);
653 	return ret;
654 }
655 
656 static int
657 lt9611_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
658 {
659 	struct lt9611 *lt9611 = data;
660 	int ret;
661 
662 	if (len > 128)
663 		return -EINVAL;
664 
665 	/* supports up to 1 extension block */
666 	/* TODO: add support for more extension blocks */
667 	if (block > 1)
668 		return -EINVAL;
669 
670 	if (block == 0) {
671 		ret = lt9611_read_edid(lt9611);
672 		if (ret) {
673 			dev_err(lt9611->dev, "edid read failed\n");
674 			return ret;
675 		}
676 	}
677 
678 	block %= 2;
679 	memcpy(buf, lt9611->edid_buf + (block * 128), len);
680 
681 	return 0;
682 }
683 
684 /* bridge funcs */
685 static void
686 lt9611_bridge_atomic_enable(struct drm_bridge *bridge,
687 			    struct drm_bridge_state *old_bridge_state)
688 {
689 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
690 	struct drm_atomic_state *state = old_bridge_state->base.state;
691 	struct drm_connector *connector;
692 	struct drm_connector_state *conn_state;
693 	struct drm_crtc_state *crtc_state;
694 	struct drm_display_mode *mode;
695 	unsigned int postdiv;
696 
697 	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
698 	if (WARN_ON(!connector))
699 		return;
700 
701 	conn_state = drm_atomic_get_new_connector_state(state, connector);
702 	if (WARN_ON(!conn_state))
703 		return;
704 
705 	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
706 	if (WARN_ON(!crtc_state))
707 		return;
708 
709 	mode = &crtc_state->adjusted_mode;
710 
711 	lt9611_mipi_input_digital(lt9611, mode);
712 	lt9611_pll_setup(lt9611, mode, &postdiv);
713 	lt9611_mipi_video_setup(lt9611, mode);
714 	lt9611_pcr_setup(lt9611, mode, postdiv);
715 
716 	if (lt9611_power_on(lt9611)) {
717 		dev_err(lt9611->dev, "power on failed\n");
718 		return;
719 	}
720 
721 	lt9611_mipi_input_analog(lt9611);
722 	lt9611_hdmi_set_infoframes(lt9611, connector, mode);
723 	lt9611_hdmi_tx_digital(lt9611, connector->display_info.is_hdmi);
724 	lt9611_hdmi_tx_phy(lt9611);
725 
726 	msleep(500);
727 
728 	lt9611_video_check(lt9611);
729 
730 	/* Enable HDMI output */
731 	regmap_write(lt9611->regmap, 0x8130, 0xea);
732 }
733 
734 static void
735 lt9611_bridge_atomic_disable(struct drm_bridge *bridge,
736 			     struct drm_bridge_state *old_bridge_state)
737 {
738 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
739 	int ret;
740 
741 	/* Disable HDMI output */
742 	ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
743 	if (ret) {
744 		dev_err(lt9611->dev, "video on failed\n");
745 		return;
746 	}
747 
748 	if (lt9611_power_off(lt9611)) {
749 		dev_err(lt9611->dev, "power on failed\n");
750 		return;
751 	}
752 }
753 
754 static struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
755 						 struct device_node *dsi_node)
756 {
757 	const struct mipi_dsi_device_info info = { "lt9611", 0, lt9611->dev->of_node};
758 	struct mipi_dsi_device *dsi;
759 	struct mipi_dsi_host *host;
760 	struct device *dev = lt9611->dev;
761 	int ret;
762 
763 	host = of_find_mipi_dsi_host_by_node(dsi_node);
764 	if (!host)
765 		return ERR_PTR(dev_err_probe(lt9611->dev, -EPROBE_DEFER, "failed to find dsi host\n"));
766 
767 	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
768 	if (IS_ERR(dsi)) {
769 		dev_err(lt9611->dev, "failed to create dsi device\n");
770 		return dsi;
771 	}
772 
773 	dsi->lanes = 4;
774 	dsi->format = MIPI_DSI_FMT_RGB888;
775 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
776 			  MIPI_DSI_MODE_VIDEO_HSE;
777 
778 	ret = devm_mipi_dsi_attach(dev, dsi);
779 	if (ret < 0) {
780 		dev_err(dev, "failed to attach dsi to host\n");
781 		return ERR_PTR(ret);
782 	}
783 
784 	return dsi;
785 }
786 
787 static int lt9611_bridge_attach(struct drm_bridge *bridge,
788 				enum drm_bridge_attach_flags flags)
789 {
790 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
791 
792 	return drm_bridge_attach(bridge->encoder, lt9611->next_bridge,
793 				 bridge, flags);
794 }
795 
796 static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
797 						     const struct drm_display_info *info,
798 						     const struct drm_display_mode *mode)
799 {
800 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
801 
802 	if (mode->hdisplay > 3840)
803 		return MODE_BAD_HVALUE;
804 
805 	if (mode->vdisplay > 2160)
806 		return MODE_BAD_VVALUE;
807 
808 	if (mode->hdisplay == 3840 &&
809 	    mode->vdisplay == 2160 &&
810 	    drm_mode_vrefresh(mode) > 30)
811 		return MODE_CLOCK_HIGH;
812 
813 	if (mode->hdisplay > 2000 && !lt9611->dsi1_node)
814 		return MODE_PANEL;
815 	else
816 		return MODE_OK;
817 }
818 
819 static void lt9611_bridge_atomic_pre_enable(struct drm_bridge *bridge,
820 					    struct drm_bridge_state *old_bridge_state)
821 {
822 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
823 	static const struct reg_sequence reg_cfg[] = {
824 		{ 0x8102, 0x12 },
825 		{ 0x8123, 0x40 },
826 		{ 0x8130, 0xea },
827 		{ 0x8011, 0xfa },
828 	};
829 
830 	if (!lt9611->sleep)
831 		return;
832 
833 	regmap_multi_reg_write(lt9611->regmap,
834 			       reg_cfg, ARRAY_SIZE(reg_cfg));
835 
836 	lt9611->sleep = false;
837 }
838 
839 static void
840 lt9611_bridge_atomic_post_disable(struct drm_bridge *bridge,
841 				  struct drm_bridge_state *old_bridge_state)
842 {
843 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
844 
845 	lt9611_sleep_setup(lt9611);
846 }
847 
848 static const struct drm_edid *lt9611_bridge_edid_read(struct drm_bridge *bridge,
849 						      struct drm_connector *connector)
850 {
851 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
852 
853 	lt9611_power_on(lt9611);
854 	return drm_edid_read_custom(connector, lt9611_get_edid_block, lt9611);
855 }
856 
857 static void lt9611_bridge_hpd_enable(struct drm_bridge *bridge)
858 {
859 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
860 
861 	lt9611_enable_hpd_interrupts(lt9611);
862 }
863 
864 #define MAX_INPUT_SEL_FORMATS	1
865 
866 static u32 *
867 lt9611_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
868 				 struct drm_bridge_state *bridge_state,
869 				 struct drm_crtc_state *crtc_state,
870 				 struct drm_connector_state *conn_state,
871 				 u32 output_fmt,
872 				 unsigned int *num_input_fmts)
873 {
874 	u32 *input_fmts;
875 
876 	*num_input_fmts = 0;
877 
878 	input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
879 			     GFP_KERNEL);
880 	if (!input_fmts)
881 		return NULL;
882 
883 	/* This is the DSI-end bus format */
884 	input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
885 	*num_input_fmts = 1;
886 
887 	return input_fmts;
888 }
889 
890 static const struct drm_bridge_funcs lt9611_bridge_funcs = {
891 	.attach = lt9611_bridge_attach,
892 	.mode_valid = lt9611_bridge_mode_valid,
893 	.detect = lt9611_bridge_detect,
894 	.edid_read = lt9611_bridge_edid_read,
895 	.hpd_enable = lt9611_bridge_hpd_enable,
896 
897 	.atomic_pre_enable = lt9611_bridge_atomic_pre_enable,
898 	.atomic_enable = lt9611_bridge_atomic_enable,
899 	.atomic_disable = lt9611_bridge_atomic_disable,
900 	.atomic_post_disable = lt9611_bridge_atomic_post_disable,
901 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
902 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
903 	.atomic_reset = drm_atomic_helper_bridge_reset,
904 	.atomic_get_input_bus_fmts = lt9611_atomic_get_input_bus_fmts,
905 };
906 
907 static int lt9611_parse_dt(struct device *dev,
908 			   struct lt9611 *lt9611)
909 {
910 	lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
911 	if (!lt9611->dsi0_node) {
912 		dev_err(lt9611->dev, "failed to get remote node for primary dsi\n");
913 		return -ENODEV;
914 	}
915 
916 	lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
917 
918 	lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
919 
920 	return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, &lt9611->next_bridge);
921 }
922 
923 static int lt9611_gpio_init(struct lt9611 *lt9611)
924 {
925 	struct device *dev = lt9611->dev;
926 
927 	lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
928 	if (IS_ERR(lt9611->reset_gpio)) {
929 		dev_err(dev, "failed to acquire reset gpio\n");
930 		return PTR_ERR(lt9611->reset_gpio);
931 	}
932 
933 	lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
934 						      GPIOD_OUT_LOW);
935 	if (IS_ERR(lt9611->enable_gpio)) {
936 		dev_err(dev, "failed to acquire enable gpio\n");
937 		return PTR_ERR(lt9611->enable_gpio);
938 	}
939 
940 	return 0;
941 }
942 
943 static int lt9611_read_device_rev(struct lt9611 *lt9611)
944 {
945 	unsigned int rev;
946 	int ret;
947 
948 	regmap_write(lt9611->regmap, 0x80ee, 0x01);
949 	ret = regmap_read(lt9611->regmap, 0x8002, &rev);
950 	if (ret)
951 		dev_err(lt9611->dev, "failed to read revision: %d\n", ret);
952 	else
953 		dev_info(lt9611->dev, "LT9611 revision: 0x%x\n", rev);
954 
955 	return ret;
956 }
957 
958 static int lt9611_hdmi_hw_params(struct device *dev, void *data,
959 				 struct hdmi_codec_daifmt *fmt,
960 				 struct hdmi_codec_params *hparms)
961 {
962 	struct lt9611 *lt9611 = data;
963 
964 	if (hparms->sample_rate == 48000)
965 		regmap_write(lt9611->regmap, 0x840f, 0x2b);
966 	else if (hparms->sample_rate == 96000)
967 		regmap_write(lt9611->regmap, 0x840f, 0xab);
968 	else
969 		return -EINVAL;
970 
971 	regmap_write(lt9611->regmap, 0x8435, 0x00);
972 	regmap_write(lt9611->regmap, 0x8436, 0x18);
973 	regmap_write(lt9611->regmap, 0x8437, 0x00);
974 
975 	return 0;
976 }
977 
978 static int lt9611_audio_startup(struct device *dev, void *data)
979 {
980 	struct lt9611 *lt9611 = data;
981 
982 	regmap_write(lt9611->regmap, 0x82d6, 0x8c);
983 	regmap_write(lt9611->regmap, 0x82d7, 0x04);
984 
985 	regmap_write(lt9611->regmap, 0x8406, 0x08);
986 	regmap_write(lt9611->regmap, 0x8407, 0x10);
987 
988 	regmap_write(lt9611->regmap, 0x8434, 0xd5);
989 
990 	return 0;
991 }
992 
993 static void lt9611_audio_shutdown(struct device *dev, void *data)
994 {
995 	struct lt9611 *lt9611 = data;
996 
997 	regmap_write(lt9611->regmap, 0x8406, 0x00);
998 	regmap_write(lt9611->regmap, 0x8407, 0x00);
999 }
1000 
1001 static int lt9611_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
1002 				      struct device_node *endpoint)
1003 {
1004 	struct of_endpoint of_ep;
1005 	int ret;
1006 
1007 	ret = of_graph_parse_endpoint(endpoint, &of_ep);
1008 	if (ret < 0)
1009 		return ret;
1010 
1011 	/*
1012 	 * HDMI sound should be located as reg = <2>
1013 	 * Then, it is sound port 0
1014 	 */
1015 	if (of_ep.port == 2)
1016 		return 0;
1017 
1018 	return -EINVAL;
1019 }
1020 
1021 static const struct hdmi_codec_ops lt9611_codec_ops = {
1022 	.hw_params	= lt9611_hdmi_hw_params,
1023 	.audio_shutdown = lt9611_audio_shutdown,
1024 	.audio_startup	= lt9611_audio_startup,
1025 	.get_dai_id	= lt9611_hdmi_i2s_get_dai_id,
1026 };
1027 
1028 static struct hdmi_codec_pdata codec_data = {
1029 	.ops = &lt9611_codec_ops,
1030 	.max_i2s_channels = 8,
1031 	.i2s = 1,
1032 };
1033 
1034 static int lt9611_audio_init(struct device *dev, struct lt9611 *lt9611)
1035 {
1036 	codec_data.data = lt9611;
1037 	lt9611->audio_pdev =
1038 		platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
1039 					      PLATFORM_DEVID_AUTO,
1040 					      &codec_data, sizeof(codec_data));
1041 
1042 	return PTR_ERR_OR_ZERO(lt9611->audio_pdev);
1043 }
1044 
1045 static void lt9611_audio_exit(struct lt9611 *lt9611)
1046 {
1047 	if (lt9611->audio_pdev) {
1048 		platform_device_unregister(lt9611->audio_pdev);
1049 		lt9611->audio_pdev = NULL;
1050 	}
1051 }
1052 
1053 static int lt9611_probe(struct i2c_client *client)
1054 {
1055 	struct lt9611 *lt9611;
1056 	struct device *dev = &client->dev;
1057 	int ret;
1058 
1059 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1060 		dev_err(dev, "device doesn't support I2C\n");
1061 		return -ENODEV;
1062 	}
1063 
1064 	lt9611 = devm_kzalloc(dev, sizeof(*lt9611), GFP_KERNEL);
1065 	if (!lt9611)
1066 		return -ENOMEM;
1067 
1068 	lt9611->dev = dev;
1069 	lt9611->client = client;
1070 	lt9611->sleep = false;
1071 
1072 	lt9611->regmap = devm_regmap_init_i2c(client, &lt9611_regmap_config);
1073 	if (IS_ERR(lt9611->regmap)) {
1074 		dev_err(lt9611->dev, "regmap i2c init failed\n");
1075 		return PTR_ERR(lt9611->regmap);
1076 	}
1077 
1078 	ret = lt9611_parse_dt(dev, lt9611);
1079 	if (ret) {
1080 		dev_err(dev, "failed to parse device tree\n");
1081 		return ret;
1082 	}
1083 
1084 	ret = lt9611_gpio_init(lt9611);
1085 	if (ret < 0)
1086 		goto err_of_put;
1087 
1088 	ret = lt9611_regulator_init(lt9611);
1089 	if (ret < 0)
1090 		goto err_of_put;
1091 
1092 	lt9611_assert_5v(lt9611);
1093 
1094 	ret = lt9611_regulator_enable(lt9611);
1095 	if (ret)
1096 		goto err_of_put;
1097 
1098 	lt9611_reset(lt9611);
1099 
1100 	ret = lt9611_read_device_rev(lt9611);
1101 	if (ret) {
1102 		dev_err(dev, "failed to read chip rev\n");
1103 		goto err_disable_regulators;
1104 	}
1105 
1106 	ret = devm_request_threaded_irq(dev, client->irq, NULL,
1107 					lt9611_irq_thread_handler,
1108 					IRQF_ONESHOT, "lt9611", lt9611);
1109 	if (ret) {
1110 		dev_err(dev, "failed to request irq\n");
1111 		goto err_disable_regulators;
1112 	}
1113 
1114 	i2c_set_clientdata(client, lt9611);
1115 
1116 	lt9611->bridge.funcs = &lt9611_bridge_funcs;
1117 	lt9611->bridge.of_node = client->dev.of_node;
1118 	lt9611->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
1119 			     DRM_BRIDGE_OP_HPD | DRM_BRIDGE_OP_MODES;
1120 	lt9611->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
1121 
1122 	drm_bridge_add(&lt9611->bridge);
1123 
1124 	/* Attach primary DSI */
1125 	lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
1126 	if (IS_ERR(lt9611->dsi0)) {
1127 		ret = PTR_ERR(lt9611->dsi0);
1128 		goto err_remove_bridge;
1129 	}
1130 
1131 	/* Attach secondary DSI, if specified */
1132 	if (lt9611->dsi1_node) {
1133 		lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
1134 		if (IS_ERR(lt9611->dsi1)) {
1135 			ret = PTR_ERR(lt9611->dsi1);
1136 			goto err_remove_bridge;
1137 		}
1138 	}
1139 
1140 	lt9611_enable_hpd_interrupts(lt9611);
1141 
1142 	ret = lt9611_audio_init(dev, lt9611);
1143 	if (ret)
1144 		goto err_remove_bridge;
1145 
1146 	return 0;
1147 
1148 err_remove_bridge:
1149 	drm_bridge_remove(&lt9611->bridge);
1150 
1151 err_disable_regulators:
1152 	regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1153 
1154 err_of_put:
1155 	of_node_put(lt9611->dsi1_node);
1156 	of_node_put(lt9611->dsi0_node);
1157 
1158 	return ret;
1159 }
1160 
1161 static void lt9611_remove(struct i2c_client *client)
1162 {
1163 	struct lt9611 *lt9611 = i2c_get_clientdata(client);
1164 
1165 	disable_irq(client->irq);
1166 	lt9611_audio_exit(lt9611);
1167 	drm_bridge_remove(&lt9611->bridge);
1168 
1169 	regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1170 
1171 	of_node_put(lt9611->dsi1_node);
1172 	of_node_put(lt9611->dsi0_node);
1173 }
1174 
1175 static struct i2c_device_id lt9611_id[] = {
1176 	{ "lontium,lt9611", 0 },
1177 	{}
1178 };
1179 MODULE_DEVICE_TABLE(i2c, lt9611_id);
1180 
1181 static const struct of_device_id lt9611_match_table[] = {
1182 	{ .compatible = "lontium,lt9611" },
1183 	{ }
1184 };
1185 MODULE_DEVICE_TABLE(of, lt9611_match_table);
1186 
1187 static struct i2c_driver lt9611_driver = {
1188 	.driver = {
1189 		.name = "lt9611",
1190 		.of_match_table = lt9611_match_table,
1191 	},
1192 	.probe = lt9611_probe,
1193 	.remove = lt9611_remove,
1194 	.id_table = lt9611_id,
1195 };
1196 module_i2c_driver(lt9611_driver);
1197 
1198 MODULE_DESCRIPTION("Lontium LT9611 DSI/HDMI bridge driver");
1199 MODULE_LICENSE("GPL v2");
1200