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/interrupt.h>
9 #include <linux/module.h>
10 #include <linux/of_graph.h>
11 #include <linux/platform_device.h>
12 #include <linux/regmap.h>
13 #include <linux/regulator/consumer.h>
14 
15 #include <sound/hdmi-codec.h>
16 
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_bridge.h>
19 #include <drm/drm_mipi_dsi.h>
20 #include <drm/drm_print.h>
21 #include <drm/drm_probe_helper.h>
22 
23 #define EDID_SEG_SIZE	256
24 #define EDID_LEN	32
25 #define EDID_LOOP	8
26 #define KEY_DDC_ACCS_DONE 0x02
27 #define DDC_NO_ACK	0x50
28 
29 #define LT9611_4LANES	0
30 
31 struct lt9611 {
32 	struct device *dev;
33 	struct drm_bridge bridge;
34 	struct drm_connector connector;
35 
36 	struct regmap *regmap;
37 
38 	struct device_node *dsi0_node;
39 	struct device_node *dsi1_node;
40 	struct mipi_dsi_device *dsi0;
41 	struct mipi_dsi_device *dsi1;
42 	struct platform_device *audio_pdev;
43 
44 	bool ac_mode;
45 
46 	struct gpio_desc *reset_gpio;
47 	struct gpio_desc *enable_gpio;
48 
49 	bool power_on;
50 	bool sleep;
51 
52 	struct regulator_bulk_data supplies[2];
53 
54 	struct i2c_client *client;
55 
56 	enum drm_connector_status status;
57 
58 	u8 edid_buf[EDID_SEG_SIZE];
59 	u32 vic;
60 };
61 
62 #define LT9611_PAGE_CONTROL	0xff
63 
64 static const struct regmap_range_cfg lt9611_ranges[] = {
65 	{
66 		.name = "register_range",
67 		.range_min =  0,
68 		.range_max = 0x85ff,
69 		.selector_reg = LT9611_PAGE_CONTROL,
70 		.selector_mask = 0xff,
71 		.selector_shift = 0,
72 		.window_start = 0,
73 		.window_len = 0x100,
74 	},
75 };
76 
77 static const struct regmap_config lt9611_regmap_config = {
78 	.reg_bits = 8,
79 	.val_bits = 8,
80 	.max_register = 0xffff,
81 	.ranges = lt9611_ranges,
82 	.num_ranges = ARRAY_SIZE(lt9611_ranges),
83 };
84 
85 struct lt9611_mode {
86 	u16 hdisplay;
87 	u16 vdisplay;
88 	u8 vrefresh;
89 	u8 lanes;
90 	u8 intfs;
91 };
92 
93 static struct lt9611_mode lt9611_modes[] = {
94 	{ 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
95 	{ 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
96 	{ 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
97 	{ 1920, 1080, 24, 3, 1 },
98 	{ 720, 480, 60, 4, 1 },
99 	{ 720, 576, 50, 2, 1 },
100 	{ 640, 480, 60, 2, 1 },
101 };
102 
103 static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
104 {
105 	return container_of(bridge, struct lt9611, bridge);
106 }
107 
108 static struct lt9611 *connector_to_lt9611(struct drm_connector *connector)
109 {
110 	return container_of(connector, struct lt9611, connector);
111 }
112 
113 static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
114 {
115 	const struct reg_sequence reg_cfg[] = {
116 		{ 0x8106, 0x40 }, /* port A rx current */
117 		{ 0x810a, 0xfe }, /* port A ldo voltage set */
118 		{ 0x810b, 0xbf }, /* enable port A lprx */
119 		{ 0x8111, 0x40 }, /* port B rx current */
120 		{ 0x8115, 0xfe }, /* port B ldo voltage set */
121 		{ 0x8116, 0xbf }, /* enable port B lprx */
122 
123 		{ 0x811c, 0x03 }, /* PortA clk lane no-LP mode */
124 		{ 0x8120, 0x03 }, /* PortB clk lane with-LP mode */
125 	};
126 
127 	return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
128 }
129 
130 static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
131 				     const struct drm_display_mode *mode)
132 {
133 	struct reg_sequence reg_cfg[] = {
134 		{ 0x8300, LT9611_4LANES },
135 		{ 0x830a, 0x00 },
136 		{ 0x824f, 0x80 },
137 		{ 0x8250, 0x10 },
138 		{ 0x8302, 0x0a },
139 		{ 0x8306, 0x0a },
140 	};
141 
142 	if (mode->hdisplay == 3840)
143 		reg_cfg[1].def = 0x03;
144 
145 	return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
146 }
147 
148 static void lt9611_mipi_video_setup(struct lt9611 *lt9611,
149 				    const struct drm_display_mode *mode)
150 {
151 	u32 h_total, hactive, hsync_len, hfront_porch, hsync_porch;
152 	u32 v_total, vactive, vsync_len, vfront_porch, vsync_porch;
153 
154 	h_total = mode->htotal;
155 	v_total = mode->vtotal;
156 
157 	hactive = mode->hdisplay;
158 	hsync_len = mode->hsync_end - mode->hsync_start;
159 	hfront_porch = mode->hsync_start - mode->hdisplay;
160 	hsync_porch = hsync_len + mode->htotal - mode->hsync_end;
161 
162 	vactive = mode->vdisplay;
163 	vsync_len = mode->vsync_end - mode->vsync_start;
164 	vfront_porch = mode->vsync_start - mode->vdisplay;
165 	vsync_porch = vsync_len + mode->vtotal - mode->vsync_end;
166 
167 	regmap_write(lt9611->regmap, 0x830d, (u8)(v_total / 256));
168 	regmap_write(lt9611->regmap, 0x830e, (u8)(v_total % 256));
169 
170 	regmap_write(lt9611->regmap, 0x830f, (u8)(vactive / 256));
171 	regmap_write(lt9611->regmap, 0x8310, (u8)(vactive % 256));
172 
173 	regmap_write(lt9611->regmap, 0x8311, (u8)(h_total / 256));
174 	regmap_write(lt9611->regmap, 0x8312, (u8)(h_total % 256));
175 
176 	regmap_write(lt9611->regmap, 0x8313, (u8)(hactive / 256));
177 	regmap_write(lt9611->regmap, 0x8314, (u8)(hactive % 256));
178 
179 	regmap_write(lt9611->regmap, 0x8315, (u8)(vsync_len % 256));
180 	regmap_write(lt9611->regmap, 0x8316, (u8)(hsync_len % 256));
181 
182 	regmap_write(lt9611->regmap, 0x8317, (u8)(vfront_porch % 256));
183 
184 	regmap_write(lt9611->regmap, 0x8318, (u8)(vsync_porch % 256));
185 
186 	regmap_write(lt9611->regmap, 0x8319, (u8)(hfront_porch % 256));
187 
188 	regmap_write(lt9611->regmap, 0x831a, (u8)(hsync_porch / 256));
189 	regmap_write(lt9611->regmap, 0x831b, (u8)(hsync_porch % 256));
190 }
191 
192 static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode)
193 {
194 	const struct reg_sequence reg_cfg[] = {
195 		{ 0x830b, 0x01 },
196 		{ 0x830c, 0x10 },
197 		{ 0x8348, 0x00 },
198 		{ 0x8349, 0x81 },
199 
200 		/* stage 1 */
201 		{ 0x8321, 0x4a },
202 		{ 0x8324, 0x71 },
203 		{ 0x8325, 0x30 },
204 		{ 0x832a, 0x01 },
205 
206 		/* stage 2 */
207 		{ 0x834a, 0x40 },
208 		{ 0x831d, 0x10 },
209 
210 		/* MK limit */
211 		{ 0x832d, 0x38 },
212 		{ 0x8331, 0x08 },
213 	};
214 	const struct reg_sequence reg_cfg2[] = {
215 		{ 0x830b, 0x03 },
216 		{ 0x830c, 0xd0 },
217 		{ 0x8348, 0x03 },
218 		{ 0x8349, 0xe0 },
219 		{ 0x8324, 0x72 },
220 		{ 0x8325, 0x00 },
221 		{ 0x832a, 0x01 },
222 		{ 0x834a, 0x10 },
223 		{ 0x831d, 0x10 },
224 		{ 0x8326, 0x37 },
225 	};
226 
227 	regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
228 
229 	switch (mode->hdisplay) {
230 	case 640:
231 		regmap_write(lt9611->regmap, 0x8326, 0x14);
232 		break;
233 	case 1920:
234 		regmap_write(lt9611->regmap, 0x8326, 0x37);
235 		break;
236 	case 3840:
237 		regmap_multi_reg_write(lt9611->regmap, reg_cfg2, ARRAY_SIZE(reg_cfg2));
238 		break;
239 	}
240 
241 	/* pcr rst */
242 	regmap_write(lt9611->regmap, 0x8011, 0x5a);
243 	regmap_write(lt9611->regmap, 0x8011, 0xfa);
244 }
245 
246 static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode)
247 {
248 	unsigned int pclk = mode->clock;
249 	const struct reg_sequence reg_cfg[] = {
250 		/* txpll init */
251 		{ 0x8123, 0x40 },
252 		{ 0x8124, 0x64 },
253 		{ 0x8125, 0x80 },
254 		{ 0x8126, 0x55 },
255 		{ 0x812c, 0x37 },
256 		{ 0x812f, 0x01 },
257 		{ 0x8126, 0x55 },
258 		{ 0x8127, 0x66 },
259 		{ 0x8128, 0x88 },
260 	};
261 
262 	regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
263 
264 	if (pclk > 150000)
265 		regmap_write(lt9611->regmap, 0x812d, 0x88);
266 	else if (pclk > 70000)
267 		regmap_write(lt9611->regmap, 0x812d, 0x99);
268 	else
269 		regmap_write(lt9611->regmap, 0x812d, 0xaa);
270 
271 	/*
272 	 * first divide pclk by 2 first
273 	 *  - write divide by 64k to 19:16 bits which means shift by 17
274 	 *  - write divide by 256 to 15:8 bits which means shift by 9
275 	 *  - write remainder to 7:0 bits, which means shift by 1
276 	 */
277 	regmap_write(lt9611->regmap, 0x82e3, pclk >> 17); /* pclk[19:16] */
278 	regmap_write(lt9611->regmap, 0x82e4, pclk >> 9);  /* pclk[15:8]  */
279 	regmap_write(lt9611->regmap, 0x82e5, pclk >> 1);  /* pclk[7:0]   */
280 
281 	regmap_write(lt9611->regmap, 0x82de, 0x20);
282 	regmap_write(lt9611->regmap, 0x82de, 0xe0);
283 
284 	regmap_write(lt9611->regmap, 0x8016, 0xf1);
285 	regmap_write(lt9611->regmap, 0x8016, 0xf3);
286 
287 	return 0;
288 }
289 
290 static int lt9611_read_video_check(struct lt9611 *lt9611, unsigned int reg)
291 {
292 	unsigned int temp, temp2;
293 	int ret;
294 
295 	ret = regmap_read(lt9611->regmap, reg, &temp);
296 	if (ret)
297 		return ret;
298 	temp <<= 8;
299 	ret = regmap_read(lt9611->regmap, reg + 1, &temp2);
300 	if (ret)
301 		return ret;
302 
303 	return (temp + temp2);
304 }
305 
306 static int lt9611_video_check(struct lt9611 *lt9611)
307 {
308 	u32 v_total, vactive, hactive_a, hactive_b, h_total_sysclk;
309 	int temp;
310 
311 	/* top module video check */
312 
313 	/* vactive */
314 	temp = lt9611_read_video_check(lt9611, 0x8282);
315 	if (temp < 0)
316 		goto end;
317 	vactive = temp;
318 
319 	/* v_total */
320 	temp = lt9611_read_video_check(lt9611, 0x826c);
321 	if (temp < 0)
322 		goto end;
323 	v_total = temp;
324 
325 	/* h_total_sysclk */
326 	temp = lt9611_read_video_check(lt9611, 0x8286);
327 	if (temp < 0)
328 		goto end;
329 	h_total_sysclk = temp;
330 
331 	/* hactive_a */
332 	temp = lt9611_read_video_check(lt9611, 0x8382);
333 	if (temp < 0)
334 		goto end;
335 	hactive_a = temp / 3;
336 
337 	/* hactive_b */
338 	temp = lt9611_read_video_check(lt9611, 0x8386);
339 	if (temp < 0)
340 		goto end;
341 	hactive_b = temp / 3;
342 
343 	dev_info(lt9611->dev,
344 		 "video check: hactive_a=%d, hactive_b=%d, vactive=%d, v_total=%d, h_total_sysclk=%d\n",
345 		 hactive_a, hactive_b, vactive, v_total, h_total_sysclk);
346 
347 	return 0;
348 
349 end:
350 	dev_err(lt9611->dev, "read video check error\n");
351 	return temp;
352 }
353 
354 static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611)
355 {
356 	regmap_write(lt9611->regmap, 0x8443, 0x46 - lt9611->vic);
357 	regmap_write(lt9611->regmap, 0x8447, lt9611->vic);
358 	regmap_write(lt9611->regmap, 0x843d, 0x0a); /* UD1 infoframe */
359 
360 	regmap_write(lt9611->regmap, 0x82d6, 0x8c);
361 	regmap_write(lt9611->regmap, 0x82d7, 0x04);
362 }
363 
364 static void lt9611_hdmi_tx_phy(struct lt9611 *lt9611)
365 {
366 	struct reg_sequence reg_cfg[] = {
367 		{ 0x8130, 0x6a },
368 		{ 0x8131, 0x44 }, /* HDMI DC mode */
369 		{ 0x8132, 0x4a },
370 		{ 0x8133, 0x0b },
371 		{ 0x8134, 0x00 },
372 		{ 0x8135, 0x00 },
373 		{ 0x8136, 0x00 },
374 		{ 0x8137, 0x44 },
375 		{ 0x813f, 0x0f },
376 		{ 0x8140, 0xa0 },
377 		{ 0x8141, 0xa0 },
378 		{ 0x8142, 0xa0 },
379 		{ 0x8143, 0xa0 },
380 		{ 0x8144, 0x0a },
381 	};
382 
383 	/* HDMI AC mode */
384 	if (lt9611->ac_mode)
385 		reg_cfg[2].def = 0x73;
386 
387 	regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
388 }
389 
390 static irqreturn_t lt9611_irq_thread_handler(int irq, void *dev_id)
391 {
392 	struct lt9611 *lt9611 = dev_id;
393 	unsigned int irq_flag0 = 0;
394 	unsigned int irq_flag3 = 0;
395 
396 	regmap_read(lt9611->regmap, 0x820f, &irq_flag3);
397 	regmap_read(lt9611->regmap, 0x820c, &irq_flag0);
398 
399 	/* hpd changed low */
400 	if (irq_flag3 & 0x80) {
401 		dev_info(lt9611->dev, "hdmi cable disconnected\n");
402 
403 		regmap_write(lt9611->regmap, 0x8207, 0xbf);
404 		regmap_write(lt9611->regmap, 0x8207, 0x3f);
405 	}
406 
407 	/* hpd changed high */
408 	if (irq_flag3 & 0x40) {
409 		dev_info(lt9611->dev, "hdmi cable connected\n");
410 
411 		regmap_write(lt9611->regmap, 0x8207, 0x7f);
412 		regmap_write(lt9611->regmap, 0x8207, 0x3f);
413 	}
414 
415 	if (irq_flag3 & 0xc0 && lt9611->bridge.dev)
416 		drm_kms_helper_hotplug_event(lt9611->bridge.dev);
417 
418 	/* video input changed */
419 	if (irq_flag0 & 0x01) {
420 		dev_info(lt9611->dev, "video input changed\n");
421 		regmap_write(lt9611->regmap, 0x829e, 0xff);
422 		regmap_write(lt9611->regmap, 0x829e, 0xf7);
423 		regmap_write(lt9611->regmap, 0x8204, 0xff);
424 		regmap_write(lt9611->regmap, 0x8204, 0xfe);
425 	}
426 
427 	return IRQ_HANDLED;
428 }
429 
430 static void lt9611_enable_hpd_interrupts(struct lt9611 *lt9611)
431 {
432 	unsigned int val;
433 
434 	regmap_read(lt9611->regmap, 0x8203, &val);
435 
436 	val &= ~0xc0;
437 	regmap_write(lt9611->regmap, 0x8203, val);
438 	regmap_write(lt9611->regmap, 0x8207, 0xff); /* clear */
439 	regmap_write(lt9611->regmap, 0x8207, 0x3f);
440 }
441 
442 static void lt9611_sleep_setup(struct lt9611 *lt9611)
443 {
444 	const struct reg_sequence sleep_setup[] = {
445 		{ 0x8024, 0x76 },
446 		{ 0x8023, 0x01 },
447 		{ 0x8157, 0x03 }, /* set addr pin as output */
448 		{ 0x8149, 0x0b },
449 		{ 0x8151, 0x30 }, /* disable IRQ */
450 		{ 0x8102, 0x48 }, /* MIPI Rx power down */
451 		{ 0x8123, 0x80 },
452 		{ 0x8130, 0x00 },
453 		{ 0x8100, 0x01 }, /* bandgap power down */
454 		{ 0x8101, 0x00 }, /* system clk power down */
455 	};
456 
457 	regmap_multi_reg_write(lt9611->regmap,
458 			       sleep_setup, ARRAY_SIZE(sleep_setup));
459 	lt9611->sleep = true;
460 }
461 
462 static int lt9611_power_on(struct lt9611 *lt9611)
463 {
464 	int ret;
465 	const struct reg_sequence seq[] = {
466 		/* LT9611_System_Init */
467 		{ 0x8101, 0x18 }, /* sel xtal clock */
468 
469 		/* timer for frequency meter */
470 		{ 0x821b, 0x69 }, /* timer 2 */
471 		{ 0x821c, 0x78 },
472 		{ 0x82cb, 0x69 }, /* timer 1 */
473 		{ 0x82cc, 0x78 },
474 
475 		/* irq init */
476 		{ 0x8251, 0x01 },
477 		{ 0x8258, 0x0a }, /* hpd irq */
478 		{ 0x8259, 0x80 }, /* hpd debounce width */
479 		{ 0x829e, 0xf7 }, /* video check irq */
480 
481 		/* power consumption for work */
482 		{ 0x8004, 0xf0 },
483 		{ 0x8006, 0xf0 },
484 		{ 0x800a, 0x80 },
485 		{ 0x800b, 0x40 },
486 		{ 0x800d, 0xef },
487 		{ 0x8011, 0xfa },
488 	};
489 
490 	if (lt9611->power_on)
491 		return 0;
492 
493 	ret = regmap_multi_reg_write(lt9611->regmap, seq, ARRAY_SIZE(seq));
494 	if (!ret)
495 		lt9611->power_on = true;
496 
497 	return ret;
498 }
499 
500 static int lt9611_power_off(struct lt9611 *lt9611)
501 {
502 	int ret;
503 
504 	ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
505 	if (!ret)
506 		lt9611->power_on = false;
507 
508 	return ret;
509 }
510 
511 static void lt9611_reset(struct lt9611 *lt9611)
512 {
513 	gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
514 	msleep(20);
515 
516 	gpiod_set_value_cansleep(lt9611->reset_gpio, 0);
517 	msleep(20);
518 
519 	gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
520 	msleep(100);
521 }
522 
523 static void lt9611_assert_5v(struct lt9611 *lt9611)
524 {
525 	if (!lt9611->enable_gpio)
526 		return;
527 
528 	gpiod_set_value_cansleep(lt9611->enable_gpio, 1);
529 	msleep(20);
530 }
531 
532 static int lt9611_regulator_init(struct lt9611 *lt9611)
533 {
534 	int ret;
535 
536 	lt9611->supplies[0].supply = "vdd";
537 	lt9611->supplies[1].supply = "vcc";
538 
539 	ret = devm_regulator_bulk_get(lt9611->dev, 2, lt9611->supplies);
540 	if (ret < 0)
541 		return ret;
542 
543 	return regulator_set_load(lt9611->supplies[0].consumer, 300000);
544 }
545 
546 static int lt9611_regulator_enable(struct lt9611 *lt9611)
547 {
548 	int ret;
549 
550 	ret = regulator_enable(lt9611->supplies[0].consumer);
551 	if (ret < 0)
552 		return ret;
553 
554 	usleep_range(1000, 10000);
555 
556 	ret = regulator_enable(lt9611->supplies[1].consumer);
557 	if (ret < 0) {
558 		regulator_disable(lt9611->supplies[0].consumer);
559 		return ret;
560 	}
561 
562 	return 0;
563 }
564 
565 static struct lt9611_mode *lt9611_find_mode(const struct drm_display_mode *mode)
566 {
567 	int i;
568 
569 	for (i = 0; i < ARRAY_SIZE(lt9611_modes); i++) {
570 		if (lt9611_modes[i].hdisplay == mode->hdisplay &&
571 		    lt9611_modes[i].vdisplay == mode->vdisplay &&
572 		    lt9611_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
573 			return &lt9611_modes[i];
574 		}
575 	}
576 
577 	return NULL;
578 }
579 
580 /* connector funcs */
581 static enum drm_connector_status
582 lt9611_connector_detect(struct drm_connector *connector, bool force)
583 {
584 	struct lt9611 *lt9611 = connector_to_lt9611(connector);
585 	unsigned int reg_val = 0;
586 	int connected = 0;
587 
588 	regmap_read(lt9611->regmap, 0x825e, &reg_val);
589 	connected  = (reg_val & BIT(2));
590 
591 	lt9611->status = connected ?  connector_status_connected :
592 				connector_status_disconnected;
593 
594 	return lt9611->status;
595 }
596 
597 static int lt9611_read_edid(struct lt9611 *lt9611)
598 {
599 	unsigned int temp;
600 	int ret = 0;
601 	int i, j;
602 
603 	/* memset to clear old buffer, if any */
604 	memset(lt9611->edid_buf, 0, sizeof(lt9611->edid_buf));
605 
606 	regmap_write(lt9611->regmap, 0x8503, 0xc9);
607 
608 	/* 0xA0 is EDID device address */
609 	regmap_write(lt9611->regmap, 0x8504, 0xa0);
610 	/* 0x00 is EDID offset address */
611 	regmap_write(lt9611->regmap, 0x8505, 0x00);
612 
613 	/* length for read */
614 	regmap_write(lt9611->regmap, 0x8506, EDID_LEN);
615 	regmap_write(lt9611->regmap, 0x8514, 0x7f);
616 
617 	for (i = 0; i < EDID_LOOP; i++) {
618 		/* offset address */
619 		regmap_write(lt9611->regmap, 0x8505, i * EDID_LEN);
620 		regmap_write(lt9611->regmap, 0x8507, 0x36);
621 		regmap_write(lt9611->regmap, 0x8507, 0x31);
622 		regmap_write(lt9611->regmap, 0x8507, 0x37);
623 		usleep_range(5000, 10000);
624 
625 		regmap_read(lt9611->regmap, 0x8540, &temp);
626 
627 		if (temp & KEY_DDC_ACCS_DONE) {
628 			for (j = 0; j < EDID_LEN; j++) {
629 				regmap_read(lt9611->regmap, 0x8583, &temp);
630 				lt9611->edid_buf[i * EDID_LEN + j] = temp;
631 			}
632 
633 		} else if (temp & DDC_NO_ACK) { /* DDC No Ack or Abitration lost */
634 			dev_err(lt9611->dev, "read edid failed: no ack\n");
635 			ret = -EIO;
636 			goto end;
637 
638 		} else {
639 			dev_err(lt9611->dev, "read edid failed: access not done\n");
640 			ret = -EIO;
641 			goto end;
642 		}
643 	}
644 
645 end:
646 	regmap_write(lt9611->regmap, 0x8507, 0x1f);
647 	return ret;
648 }
649 
650 static int
651 lt9611_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
652 {
653 	struct lt9611 *lt9611 = data;
654 	int ret;
655 
656 	if (len > 128)
657 		return -EINVAL;
658 
659 	/* supports up to 1 extension block */
660 	/* TODO: add support for more extension blocks */
661 	if (block > 1)
662 		return -EINVAL;
663 
664 	if (block == 0) {
665 		ret = lt9611_read_edid(lt9611);
666 		if (ret) {
667 			dev_err(lt9611->dev, "edid read failed\n");
668 			return ret;
669 		}
670 	}
671 
672 	block %= 2;
673 	memcpy(buf, lt9611->edid_buf + (block * 128), len);
674 
675 	return 0;
676 }
677 
678 static int lt9611_connector_get_modes(struct drm_connector *connector)
679 {
680 	struct lt9611 *lt9611 = connector_to_lt9611(connector);
681 	unsigned int count;
682 	struct edid *edid;
683 
684 	lt9611_power_on(lt9611);
685 	edid = drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
686 	drm_connector_update_edid_property(connector, edid);
687 	count = drm_add_edid_modes(connector, edid);
688 	kfree(edid);
689 
690 	return count;
691 }
692 
693 static enum drm_mode_status
694 lt9611_connector_mode_valid(struct drm_connector *connector,
695 			    struct drm_display_mode *mode)
696 {
697 	struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
698 
699 	return lt9611_mode ? MODE_OK : MODE_BAD;
700 }
701 
702 /* bridge funcs */
703 static void lt9611_bridge_enable(struct drm_bridge *bridge)
704 {
705 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
706 
707 	if (lt9611_power_on(lt9611)) {
708 		dev_err(lt9611->dev, "power on failed\n");
709 		return;
710 	}
711 
712 	lt9611_mipi_input_analog(lt9611);
713 	lt9611_hdmi_tx_digital(lt9611);
714 	lt9611_hdmi_tx_phy(lt9611);
715 
716 	msleep(500);
717 
718 	lt9611_video_check(lt9611);
719 
720 	/* Enable HDMI output */
721 	regmap_write(lt9611->regmap, 0x8130, 0xea);
722 }
723 
724 static void lt9611_bridge_disable(struct drm_bridge *bridge)
725 {
726 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
727 	int ret;
728 
729 	/* Disable HDMI output */
730 	ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
731 	if (ret) {
732 		dev_err(lt9611->dev, "video on failed\n");
733 		return;
734 	}
735 
736 	if (lt9611_power_off(lt9611)) {
737 		dev_err(lt9611->dev, "power on failed\n");
738 		return;
739 	}
740 }
741 
742 static struct
743 drm_connector_helper_funcs lt9611_bridge_connector_helper_funcs = {
744 	.get_modes = lt9611_connector_get_modes,
745 	.mode_valid = lt9611_connector_mode_valid,
746 };
747 
748 static const struct drm_connector_funcs lt9611_bridge_connector_funcs = {
749 	.fill_modes = drm_helper_probe_single_connector_modes,
750 	.detect = lt9611_connector_detect,
751 	.destroy = drm_connector_cleanup,
752 	.reset = drm_atomic_helper_connector_reset,
753 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
754 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
755 };
756 
757 static struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
758 						 struct device_node *dsi_node)
759 {
760 	const struct mipi_dsi_device_info info = { "lt9611", 0, NULL };
761 	struct mipi_dsi_device *dsi;
762 	struct mipi_dsi_host *host;
763 	int ret;
764 
765 	host = of_find_mipi_dsi_host_by_node(dsi_node);
766 	if (!host) {
767 		dev_err(lt9611->dev, "failed to find dsi host\n");
768 		return ERR_PTR(-EPROBE_DEFER);
769 	}
770 
771 	dsi = mipi_dsi_device_register_full(host, &info);
772 	if (IS_ERR(dsi)) {
773 		dev_err(lt9611->dev, "failed to create dsi device\n");
774 		return dsi;
775 	}
776 
777 	dsi->lanes = 4;
778 	dsi->format = MIPI_DSI_FMT_RGB888;
779 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
780 			  MIPI_DSI_MODE_VIDEO_HSE;
781 
782 	ret = mipi_dsi_attach(dsi);
783 	if (ret < 0) {
784 		dev_err(lt9611->dev, "failed to attach dsi to host\n");
785 		mipi_dsi_device_unregister(dsi);
786 		return ERR_PTR(ret);
787 	}
788 
789 	return dsi;
790 }
791 
792 static void lt9611_bridge_detach(struct drm_bridge *bridge)
793 {
794 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
795 
796 	if (lt9611->dsi1) {
797 		mipi_dsi_detach(lt9611->dsi1);
798 		mipi_dsi_device_unregister(lt9611->dsi1);
799 	}
800 
801 	mipi_dsi_detach(lt9611->dsi0);
802 	mipi_dsi_device_unregister(lt9611->dsi0);
803 }
804 
805 static int lt9611_connector_init(struct drm_bridge *bridge, struct lt9611 *lt9611)
806 {
807 	int ret;
808 
809 	ret = drm_connector_init(bridge->dev, &lt9611->connector,
810 				 &lt9611_bridge_connector_funcs,
811 				 DRM_MODE_CONNECTOR_HDMIA);
812 	if (ret) {
813 		DRM_ERROR("Failed to initialize connector with drm\n");
814 		return ret;
815 	}
816 
817 	drm_connector_helper_add(&lt9611->connector,
818 				 &lt9611_bridge_connector_helper_funcs);
819 	drm_connector_attach_encoder(&lt9611->connector, bridge->encoder);
820 
821 	if (!bridge->encoder) {
822 		DRM_ERROR("Parent encoder object not found");
823 		return -ENODEV;
824 	}
825 
826 	return 0;
827 }
828 
829 static int lt9611_bridge_attach(struct drm_bridge *bridge,
830 				enum drm_bridge_attach_flags flags)
831 {
832 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
833 	int ret;
834 
835 	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
836 		ret = lt9611_connector_init(bridge, lt9611);
837 		if (ret < 0)
838 			return ret;
839 	}
840 
841 	/* Attach primary DSI */
842 	lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
843 	if (IS_ERR(lt9611->dsi0))
844 		return PTR_ERR(lt9611->dsi0);
845 
846 	/* Attach secondary DSI, if specified */
847 	if (lt9611->dsi1_node) {
848 		lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
849 		if (IS_ERR(lt9611->dsi1)) {
850 			ret = PTR_ERR(lt9611->dsi1);
851 			goto err_unregister_dsi0;
852 		}
853 	}
854 
855 	return 0;
856 
857 err_unregister_dsi0:
858 	lt9611_bridge_detach(bridge);
859 	drm_connector_cleanup(&lt9611->connector);
860 	mipi_dsi_device_unregister(lt9611->dsi0);
861 
862 	return ret;
863 }
864 
865 static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
866 						     const struct drm_display_info *info,
867 						     const struct drm_display_mode *mode)
868 {
869 	struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
870 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
871 
872 	if (!lt9611_mode)
873 		return MODE_BAD;
874 	else if (lt9611_mode->intfs > 1 && !lt9611->dsi1)
875 		return MODE_PANEL;
876 	else
877 		return MODE_OK;
878 }
879 
880 static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
881 {
882 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
883 
884 	if (!lt9611->sleep)
885 		return;
886 
887 	lt9611_reset(lt9611);
888 	regmap_write(lt9611->regmap, 0x80ee, 0x01);
889 
890 	lt9611->sleep = false;
891 }
892 
893 static void lt9611_bridge_post_disable(struct drm_bridge *bridge)
894 {
895 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
896 
897 	lt9611_sleep_setup(lt9611);
898 }
899 
900 static void lt9611_bridge_mode_set(struct drm_bridge *bridge,
901 				   const struct drm_display_mode *mode,
902 				   const struct drm_display_mode *adj_mode)
903 {
904 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
905 	struct hdmi_avi_infoframe avi_frame;
906 	int ret;
907 
908 	lt9611_bridge_pre_enable(bridge);
909 
910 	lt9611_mipi_input_digital(lt9611, mode);
911 	lt9611_pll_setup(lt9611, mode);
912 	lt9611_mipi_video_setup(lt9611, mode);
913 	lt9611_pcr_setup(lt9611, mode);
914 
915 	ret = drm_hdmi_avi_infoframe_from_display_mode(&avi_frame,
916 						       &lt9611->connector,
917 						       mode);
918 	if (!ret)
919 		lt9611->vic = avi_frame.video_code;
920 }
921 
922 static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
923 {
924 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
925 	unsigned int reg_val = 0;
926 	int connected;
927 
928 	regmap_read(lt9611->regmap, 0x825e, &reg_val);
929 	connected  = reg_val & BIT(2);
930 
931 	lt9611->status = connected ?  connector_status_connected :
932 				connector_status_disconnected;
933 
934 	return lt9611->status;
935 }
936 
937 static struct edid *lt9611_bridge_get_edid(struct drm_bridge *bridge,
938 					   struct drm_connector *connector)
939 {
940 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
941 
942 	lt9611_power_on(lt9611);
943 	return drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
944 }
945 
946 static void lt9611_bridge_hpd_enable(struct drm_bridge *bridge)
947 {
948 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
949 
950 	lt9611_enable_hpd_interrupts(lt9611);
951 }
952 
953 static const struct drm_bridge_funcs lt9611_bridge_funcs = {
954 	.attach = lt9611_bridge_attach,
955 	.detach = lt9611_bridge_detach,
956 	.mode_valid = lt9611_bridge_mode_valid,
957 	.enable = lt9611_bridge_enable,
958 	.disable = lt9611_bridge_disable,
959 	.post_disable = lt9611_bridge_post_disable,
960 	.mode_set = lt9611_bridge_mode_set,
961 	.detect = lt9611_bridge_detect,
962 	.get_edid = lt9611_bridge_get_edid,
963 	.hpd_enable = lt9611_bridge_hpd_enable,
964 };
965 
966 static int lt9611_parse_dt(struct device *dev,
967 			   struct lt9611 *lt9611)
968 {
969 	lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
970 	if (!lt9611->dsi0_node) {
971 		dev_err(lt9611->dev, "failed to get remote node for primary dsi\n");
972 		return -ENODEV;
973 	}
974 
975 	lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
976 
977 	lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
978 
979 	return 0;
980 }
981 
982 static int lt9611_gpio_init(struct lt9611 *lt9611)
983 {
984 	struct device *dev = lt9611->dev;
985 
986 	lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
987 	if (IS_ERR(lt9611->reset_gpio)) {
988 		dev_err(dev, "failed to acquire reset gpio\n");
989 		return PTR_ERR(lt9611->reset_gpio);
990 	}
991 
992 	lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
993 						      GPIOD_OUT_LOW);
994 	if (IS_ERR(lt9611->enable_gpio)) {
995 		dev_err(dev, "failed to acquire enable gpio\n");
996 		return PTR_ERR(lt9611->enable_gpio);
997 	}
998 
999 	return 0;
1000 }
1001 
1002 static int lt9611_read_device_rev(struct lt9611 *lt9611)
1003 {
1004 	unsigned int rev;
1005 	int ret;
1006 
1007 	regmap_write(lt9611->regmap, 0x80ee, 0x01);
1008 	ret = regmap_read(lt9611->regmap, 0x8002, &rev);
1009 	if (ret)
1010 		dev_err(lt9611->dev, "failed to read revision: %d\n", ret);
1011 	else
1012 		dev_info(lt9611->dev, "LT9611 revision: 0x%x\n", rev);
1013 
1014 	return ret;
1015 }
1016 
1017 static int lt9611_hdmi_hw_params(struct device *dev, void *data,
1018 				 struct hdmi_codec_daifmt *fmt,
1019 				 struct hdmi_codec_params *hparms)
1020 {
1021 	struct lt9611 *lt9611 = data;
1022 
1023 	if (hparms->sample_rate == 48000)
1024 		regmap_write(lt9611->regmap, 0x840f, 0x2b);
1025 	else if (hparms->sample_rate == 96000)
1026 		regmap_write(lt9611->regmap, 0x840f, 0xab);
1027 	else
1028 		return -EINVAL;
1029 
1030 	regmap_write(lt9611->regmap, 0x8435, 0x00);
1031 	regmap_write(lt9611->regmap, 0x8436, 0x18);
1032 	regmap_write(lt9611->regmap, 0x8437, 0x00);
1033 
1034 	return 0;
1035 }
1036 
1037 static int lt9611_audio_startup(struct device *dev, void *data)
1038 {
1039 	struct lt9611 *lt9611 = data;
1040 
1041 	regmap_write(lt9611->regmap, 0x82d6, 0x8c);
1042 	regmap_write(lt9611->regmap, 0x82d7, 0x04);
1043 
1044 	regmap_write(lt9611->regmap, 0x8406, 0x08);
1045 	regmap_write(lt9611->regmap, 0x8407, 0x10);
1046 
1047 	regmap_write(lt9611->regmap, 0x8434, 0xd5);
1048 
1049 	return 0;
1050 }
1051 
1052 static void lt9611_audio_shutdown(struct device *dev, void *data)
1053 {
1054 	struct lt9611 *lt9611 = data;
1055 
1056 	regmap_write(lt9611->regmap, 0x8406, 0x00);
1057 	regmap_write(lt9611->regmap, 0x8407, 0x00);
1058 }
1059 
1060 static int lt9611_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
1061 				      struct device_node *endpoint)
1062 {
1063 	struct of_endpoint of_ep;
1064 	int ret;
1065 
1066 	ret = of_graph_parse_endpoint(endpoint, &of_ep);
1067 	if (ret < 0)
1068 		return ret;
1069 
1070 	/*
1071 	 * HDMI sound should be located as reg = <2>
1072 	 * Then, it is sound port 0
1073 	 */
1074 	if (of_ep.port == 2)
1075 		return 0;
1076 
1077 	return -EINVAL;
1078 }
1079 
1080 static const struct hdmi_codec_ops lt9611_codec_ops = {
1081 	.hw_params	= lt9611_hdmi_hw_params,
1082 	.audio_shutdown = lt9611_audio_shutdown,
1083 	.audio_startup	= lt9611_audio_startup,
1084 	.get_dai_id	= lt9611_hdmi_i2s_get_dai_id,
1085 };
1086 
1087 static struct hdmi_codec_pdata codec_data = {
1088 	.ops = &lt9611_codec_ops,
1089 	.max_i2s_channels = 8,
1090 	.i2s = 1,
1091 };
1092 
1093 static int lt9611_audio_init(struct device *dev, struct lt9611 *lt9611)
1094 {
1095 	codec_data.data = lt9611;
1096 	lt9611->audio_pdev =
1097 		platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
1098 					      PLATFORM_DEVID_AUTO,
1099 					      &codec_data, sizeof(codec_data));
1100 
1101 	return PTR_ERR_OR_ZERO(lt9611->audio_pdev);
1102 }
1103 
1104 static void lt9611_audio_exit(struct lt9611 *lt9611)
1105 {
1106 	if (lt9611->audio_pdev) {
1107 		platform_device_unregister(lt9611->audio_pdev);
1108 		lt9611->audio_pdev = NULL;
1109 	}
1110 }
1111 
1112 static int lt9611_probe(struct i2c_client *client,
1113 			const struct i2c_device_id *id)
1114 {
1115 	struct lt9611 *lt9611;
1116 	struct device *dev = &client->dev;
1117 	int ret;
1118 
1119 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1120 		dev_err(dev, "device doesn't support I2C\n");
1121 		return -ENODEV;
1122 	}
1123 
1124 	lt9611 = devm_kzalloc(dev, sizeof(*lt9611), GFP_KERNEL);
1125 	if (!lt9611)
1126 		return -ENOMEM;
1127 
1128 	lt9611->dev = &client->dev;
1129 	lt9611->client = client;
1130 	lt9611->sleep = false;
1131 
1132 	lt9611->regmap = devm_regmap_init_i2c(client, &lt9611_regmap_config);
1133 	if (IS_ERR(lt9611->regmap)) {
1134 		dev_err(lt9611->dev, "regmap i2c init failed\n");
1135 		return PTR_ERR(lt9611->regmap);
1136 	}
1137 
1138 	ret = lt9611_parse_dt(&client->dev, lt9611);
1139 	if (ret) {
1140 		dev_err(dev, "failed to parse device tree\n");
1141 		return ret;
1142 	}
1143 
1144 	ret = lt9611_gpio_init(lt9611);
1145 	if (ret < 0)
1146 		goto err_of_put;
1147 
1148 	ret = lt9611_regulator_init(lt9611);
1149 	if (ret < 0)
1150 		goto err_of_put;
1151 
1152 	lt9611_assert_5v(lt9611);
1153 
1154 	ret = lt9611_regulator_enable(lt9611);
1155 	if (ret)
1156 		goto err_of_put;
1157 
1158 	lt9611_reset(lt9611);
1159 
1160 	ret = lt9611_read_device_rev(lt9611);
1161 	if (ret) {
1162 		dev_err(dev, "failed to read chip rev\n");
1163 		goto err_disable_regulators;
1164 	}
1165 
1166 	ret = devm_request_threaded_irq(dev, client->irq, NULL,
1167 					lt9611_irq_thread_handler,
1168 					IRQF_ONESHOT, "lt9611", lt9611);
1169 	if (ret) {
1170 		dev_err(dev, "failed to request irq\n");
1171 		goto err_disable_regulators;
1172 	}
1173 
1174 	i2c_set_clientdata(client, lt9611);
1175 
1176 	lt9611->bridge.funcs = &lt9611_bridge_funcs;
1177 	lt9611->bridge.of_node = client->dev.of_node;
1178 	lt9611->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
1179 			     DRM_BRIDGE_OP_HPD | DRM_BRIDGE_OP_MODES;
1180 	lt9611->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
1181 
1182 	drm_bridge_add(&lt9611->bridge);
1183 
1184 	lt9611_enable_hpd_interrupts(lt9611);
1185 
1186 	return lt9611_audio_init(dev, lt9611);
1187 
1188 err_disable_regulators:
1189 	regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1190 
1191 err_of_put:
1192 	of_node_put(lt9611->dsi1_node);
1193 	of_node_put(lt9611->dsi0_node);
1194 
1195 	return ret;
1196 }
1197 
1198 static int lt9611_remove(struct i2c_client *client)
1199 {
1200 	struct lt9611 *lt9611 = i2c_get_clientdata(client);
1201 
1202 	disable_irq(client->irq);
1203 	lt9611_audio_exit(lt9611);
1204 	drm_bridge_remove(&lt9611->bridge);
1205 
1206 	regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1207 
1208 	of_node_put(lt9611->dsi1_node);
1209 	of_node_put(lt9611->dsi0_node);
1210 
1211 	return 0;
1212 }
1213 
1214 static struct i2c_device_id lt9611_id[] = {
1215 	{ "lontium,lt9611", 0 },
1216 	{}
1217 };
1218 MODULE_DEVICE_TABLE(i2c, lt9611_id);
1219 
1220 static const struct of_device_id lt9611_match_table[] = {
1221 	{ .compatible = "lontium,lt9611" },
1222 	{ }
1223 };
1224 MODULE_DEVICE_TABLE(of, lt9611_match_table);
1225 
1226 static struct i2c_driver lt9611_driver = {
1227 	.driver = {
1228 		.name = "lt9611",
1229 		.of_match_table = lt9611_match_table,
1230 	},
1231 	.probe = lt9611_probe,
1232 	.remove = lt9611_remove,
1233 	.id_table = lt9611_id,
1234 };
1235 module_i2c_driver(lt9611_driver);
1236 
1237 MODULE_LICENSE("GPL v2");
1238