1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright(c) 2020, Analogix Semiconductor. All rights reserved.
4  *
5  */
6 #include <linux/gcd.h>
7 #include <linux/gpio/consumer.h>
8 #include <linux/i2c.h>
9 #include <linux/interrupt.h>
10 #include <linux/iopoll.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/slab.h>
17 #include <linux/types.h>
18 #include <linux/workqueue.h>
19 
20 #include <linux/of_gpio.h>
21 #include <linux/of_graph.h>
22 #include <linux/of_platform.h>
23 
24 #include <drm/display/drm_dp_aux_bus.h>
25 #include <drm/display/drm_dp_helper.h>
26 #include <drm/display/drm_hdcp_helper.h>
27 #include <drm/drm_atomic_helper.h>
28 #include <drm/drm_bridge.h>
29 #include <drm/drm_crtc_helper.h>
30 #include <drm/drm_edid.h>
31 #include <drm/drm_mipi_dsi.h>
32 #include <drm/drm_of.h>
33 #include <drm/drm_panel.h>
34 #include <drm/drm_print.h>
35 #include <drm/drm_probe_helper.h>
36 
37 #include <media/v4l2-fwnode.h>
38 #include <sound/hdmi-codec.h>
39 #include <video/display_timing.h>
40 
41 #include "anx7625.h"
42 
43 /*
44  * There is a sync issue while access I2C register between AP(CPU) and
45  * internal firmware(OCM), to avoid the race condition, AP should access
46  * the reserved slave address before slave address occurs changes.
47  */
48 static int i2c_access_workaround(struct anx7625_data *ctx,
49 				 struct i2c_client *client)
50 {
51 	u8 offset;
52 	struct device *dev = &client->dev;
53 	int ret;
54 
55 	if (client == ctx->last_client)
56 		return 0;
57 
58 	ctx->last_client = client;
59 
60 	if (client == ctx->i2c.tcpc_client)
61 		offset = RSVD_00_ADDR;
62 	else if (client == ctx->i2c.tx_p0_client)
63 		offset = RSVD_D1_ADDR;
64 	else if (client == ctx->i2c.tx_p1_client)
65 		offset = RSVD_60_ADDR;
66 	else if (client == ctx->i2c.rx_p0_client)
67 		offset = RSVD_39_ADDR;
68 	else if (client == ctx->i2c.rx_p1_client)
69 		offset = RSVD_7F_ADDR;
70 	else
71 		offset = RSVD_00_ADDR;
72 
73 	ret = i2c_smbus_write_byte_data(client, offset, 0x00);
74 	if (ret < 0)
75 		DRM_DEV_ERROR(dev,
76 			      "fail to access i2c id=%x\n:%x",
77 			      client->addr, offset);
78 
79 	return ret;
80 }
81 
82 static int anx7625_reg_read(struct anx7625_data *ctx,
83 			    struct i2c_client *client, u8 reg_addr)
84 {
85 	int ret;
86 	struct device *dev = &client->dev;
87 
88 	i2c_access_workaround(ctx, client);
89 
90 	ret = i2c_smbus_read_byte_data(client, reg_addr);
91 	if (ret < 0)
92 		DRM_DEV_ERROR(dev, "read i2c fail id=%x:%x\n",
93 			      client->addr, reg_addr);
94 
95 	return ret;
96 }
97 
98 static int anx7625_reg_block_read(struct anx7625_data *ctx,
99 				  struct i2c_client *client,
100 				  u8 reg_addr, u8 len, u8 *buf)
101 {
102 	int ret;
103 	struct device *dev = &client->dev;
104 
105 	i2c_access_workaround(ctx, client);
106 
107 	ret = i2c_smbus_read_i2c_block_data(client, reg_addr, len, buf);
108 	if (ret < 0)
109 		DRM_DEV_ERROR(dev, "read i2c block fail id=%x:%x\n",
110 			      client->addr, reg_addr);
111 
112 	return ret;
113 }
114 
115 static int anx7625_reg_write(struct anx7625_data *ctx,
116 			     struct i2c_client *client,
117 			     u8 reg_addr, u8 reg_val)
118 {
119 	int ret;
120 	struct device *dev = &client->dev;
121 
122 	i2c_access_workaround(ctx, client);
123 
124 	ret = i2c_smbus_write_byte_data(client, reg_addr, reg_val);
125 
126 	if (ret < 0)
127 		DRM_DEV_ERROR(dev, "fail to write i2c id=%x\n:%x",
128 			      client->addr, reg_addr);
129 
130 	return ret;
131 }
132 
133 static int anx7625_reg_block_write(struct anx7625_data *ctx,
134 				   struct i2c_client *client,
135 				   u8 reg_addr, u8 len, u8 *buf)
136 {
137 	int ret;
138 	struct device *dev = &client->dev;
139 
140 	i2c_access_workaround(ctx, client);
141 
142 	ret = i2c_smbus_write_i2c_block_data(client, reg_addr, len, buf);
143 	if (ret < 0)
144 		dev_err(dev, "write i2c block failed id=%x\n:%x",
145 			client->addr, reg_addr);
146 
147 	return ret;
148 }
149 
150 static int anx7625_write_or(struct anx7625_data *ctx,
151 			    struct i2c_client *client,
152 			    u8 offset, u8 mask)
153 {
154 	int val;
155 
156 	val = anx7625_reg_read(ctx, client, offset);
157 	if (val < 0)
158 		return val;
159 
160 	return anx7625_reg_write(ctx, client, offset, (val | (mask)));
161 }
162 
163 static int anx7625_write_and(struct anx7625_data *ctx,
164 			     struct i2c_client *client,
165 			     u8 offset, u8 mask)
166 {
167 	int val;
168 
169 	val = anx7625_reg_read(ctx, client, offset);
170 	if (val < 0)
171 		return val;
172 
173 	return anx7625_reg_write(ctx, client, offset, (val & (mask)));
174 }
175 
176 static int anx7625_write_and_or(struct anx7625_data *ctx,
177 				struct i2c_client *client,
178 				u8 offset, u8 and_mask, u8 or_mask)
179 {
180 	int val;
181 
182 	val = anx7625_reg_read(ctx, client, offset);
183 	if (val < 0)
184 		return val;
185 
186 	return anx7625_reg_write(ctx, client,
187 				 offset, (val & and_mask) | (or_mask));
188 }
189 
190 static int anx7625_config_bit_matrix(struct anx7625_data *ctx)
191 {
192 	int i, ret;
193 
194 	ret = anx7625_write_or(ctx, ctx->i2c.tx_p2_client,
195 			       AUDIO_CONTROL_REGISTER, 0x80);
196 	for (i = 0; i < 13; i++)
197 		ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
198 					 VIDEO_BIT_MATRIX_12 + i,
199 					 0x18 + i);
200 
201 	return ret;
202 }
203 
204 static int anx7625_read_ctrl_status_p0(struct anx7625_data *ctx)
205 {
206 	return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, AP_AUX_CTRL_STATUS);
207 }
208 
209 static int wait_aux_op_finish(struct anx7625_data *ctx)
210 {
211 	struct device *dev = &ctx->client->dev;
212 	int val;
213 	int ret;
214 
215 	ret = readx_poll_timeout(anx7625_read_ctrl_status_p0,
216 				 ctx, val,
217 				 (!(val & AP_AUX_CTRL_OP_EN) || (val < 0)),
218 				 2000,
219 				 2000 * 150);
220 	if (ret) {
221 		DRM_DEV_ERROR(dev, "aux operation fail!\n");
222 		return -EIO;
223 	}
224 
225 	val = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
226 			       AP_AUX_CTRL_STATUS);
227 	if (val < 0 || (val & 0x0F)) {
228 		DRM_DEV_ERROR(dev, "aux status %02x\n", val);
229 		return -EIO;
230 	}
231 
232 	return 0;
233 }
234 
235 static int anx7625_aux_trans(struct anx7625_data *ctx, u8 op, u32 address,
236 			     u8 len, u8 *buf)
237 {
238 	struct device *dev = &ctx->client->dev;
239 	int ret;
240 	u8 addrh, addrm, addrl;
241 	u8 cmd;
242 	bool is_write = !(op & DP_AUX_I2C_READ);
243 
244 	if (len > DP_AUX_MAX_PAYLOAD_BYTES) {
245 		dev_err(dev, "exceed aux buffer len.\n");
246 		return -EINVAL;
247 	}
248 
249 	if (!len)
250 		return len;
251 
252 	addrl = address & 0xFF;
253 	addrm = (address >> 8) & 0xFF;
254 	addrh = (address >> 16) & 0xFF;
255 
256 	if (!is_write)
257 		op &= ~DP_AUX_I2C_MOT;
258 	cmd = DPCD_CMD(len, op);
259 
260 	/* Set command and length */
261 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
262 				AP_AUX_COMMAND, cmd);
263 
264 	/* Set aux access address */
265 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
266 				 AP_AUX_ADDR_7_0, addrl);
267 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
268 				 AP_AUX_ADDR_15_8, addrm);
269 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
270 				 AP_AUX_ADDR_19_16, addrh);
271 
272 	if (is_write)
273 		ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client,
274 					       AP_AUX_BUFF_START, len, buf);
275 	/* Enable aux access */
276 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
277 				AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
278 
279 	if (ret < 0) {
280 		dev_err(dev, "cannot access aux related register.\n");
281 		return -EIO;
282 	}
283 
284 	ret = wait_aux_op_finish(ctx);
285 	if (ret < 0) {
286 		dev_err(dev, "aux IO error: wait aux op finish.\n");
287 		return ret;
288 	}
289 
290 	/* Write done */
291 	if (is_write)
292 		return len;
293 
294 	/* Read done, read out dpcd data */
295 	ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
296 				     AP_AUX_BUFF_START, len, buf);
297 	if (ret < 0) {
298 		dev_err(dev, "read dpcd register failed\n");
299 		return -EIO;
300 	}
301 
302 	return len;
303 }
304 
305 static int anx7625_video_mute_control(struct anx7625_data *ctx,
306 				      u8 status)
307 {
308 	int ret;
309 
310 	if (status) {
311 		/* Set mute on flag */
312 		ret = anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
313 				       AP_AV_STATUS, AP_MIPI_MUTE);
314 		/* Clear mipi RX en */
315 		ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
316 					 AP_AV_STATUS, (u8)~AP_MIPI_RX_EN);
317 	} else {
318 		/* Mute off flag */
319 		ret = anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
320 					AP_AV_STATUS, (u8)~AP_MIPI_MUTE);
321 		/* Set MIPI RX EN */
322 		ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
323 					AP_AV_STATUS, AP_MIPI_RX_EN);
324 	}
325 
326 	return ret;
327 }
328 
329 /* Reduction of fraction a/b */
330 static void anx7625_reduction_of_a_fraction(unsigned long *a, unsigned long *b)
331 {
332 	unsigned long gcd_num;
333 	unsigned long tmp_a, tmp_b;
334 	u32 i = 1;
335 
336 	gcd_num = gcd(*a, *b);
337 	*a /= gcd_num;
338 	*b /= gcd_num;
339 
340 	tmp_a = *a;
341 	tmp_b = *b;
342 
343 	while ((*a > MAX_UNSIGNED_24BIT) || (*b > MAX_UNSIGNED_24BIT)) {
344 		i++;
345 		*a = tmp_a / i;
346 		*b = tmp_b / i;
347 	}
348 
349 	/*
350 	 * In the end, make a, b larger to have higher ODFC PLL
351 	 * output frequency accuracy
352 	 */
353 	while ((*a < MAX_UNSIGNED_24BIT) && (*b < MAX_UNSIGNED_24BIT)) {
354 		*a <<= 1;
355 		*b <<= 1;
356 	}
357 
358 	*a >>= 1;
359 	*b >>= 1;
360 }
361 
362 static int anx7625_calculate_m_n(u32 pixelclock,
363 				 unsigned long *m,
364 				 unsigned long *n,
365 				 u8 *post_divider)
366 {
367 	if (pixelclock > PLL_OUT_FREQ_ABS_MAX / POST_DIVIDER_MIN) {
368 		/* Pixel clock frequency is too high */
369 		DRM_ERROR("pixelclock too high, act(%d), maximum(%lu)\n",
370 			  pixelclock,
371 			  PLL_OUT_FREQ_ABS_MAX / POST_DIVIDER_MIN);
372 		return -EINVAL;
373 	}
374 
375 	if (pixelclock < PLL_OUT_FREQ_ABS_MIN / POST_DIVIDER_MAX) {
376 		/* Pixel clock frequency is too low */
377 		DRM_ERROR("pixelclock too low, act(%d), maximum(%lu)\n",
378 			  pixelclock,
379 			  PLL_OUT_FREQ_ABS_MIN / POST_DIVIDER_MAX);
380 		return -EINVAL;
381 	}
382 
383 	for (*post_divider = 1;
384 		pixelclock < (PLL_OUT_FREQ_MIN / (*post_divider));)
385 		*post_divider += 1;
386 
387 	if (*post_divider > POST_DIVIDER_MAX) {
388 		for (*post_divider = 1;
389 			(pixelclock <
390 			 (PLL_OUT_FREQ_ABS_MIN / (*post_divider)));)
391 			*post_divider += 1;
392 
393 		if (*post_divider > POST_DIVIDER_MAX) {
394 			DRM_ERROR("cannot find property post_divider(%d)\n",
395 				  *post_divider);
396 			return -EDOM;
397 		}
398 	}
399 
400 	/* Patch to improve the accuracy */
401 	if (*post_divider == 7) {
402 		/* 27,000,000 is not divisible by 7 */
403 		*post_divider = 8;
404 	} else if (*post_divider == 11) {
405 		/* 27,000,000 is not divisible by 11 */
406 		*post_divider = 12;
407 	} else if ((*post_divider == 13) || (*post_divider == 14)) {
408 		/* 27,000,000 is not divisible by 13 or 14 */
409 		*post_divider = 15;
410 	}
411 
412 	if (pixelclock * (*post_divider) > PLL_OUT_FREQ_ABS_MAX) {
413 		DRM_ERROR("act clock(%u) large than maximum(%lu)\n",
414 			  pixelclock * (*post_divider),
415 			  PLL_OUT_FREQ_ABS_MAX);
416 		return -EDOM;
417 	}
418 
419 	*m = pixelclock;
420 	*n = XTAL_FRQ / (*post_divider);
421 
422 	anx7625_reduction_of_a_fraction(m, n);
423 
424 	return 0;
425 }
426 
427 static int anx7625_odfc_config(struct anx7625_data *ctx,
428 			       u8 post_divider)
429 {
430 	int ret;
431 	struct device *dev = &ctx->client->dev;
432 
433 	/* Config input reference clock frequency 27MHz/19.2MHz */
434 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_16,
435 				~(REF_CLK_27000KHZ << MIPI_FREF_D_IND));
436 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_16,
437 				(REF_CLK_27000KHZ << MIPI_FREF_D_IND));
438 	/* Post divider */
439 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client,
440 				 MIPI_DIGITAL_PLL_8, 0x0f);
441 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_8,
442 				post_divider << 4);
443 
444 	/* Add patch for MIS2-125 (5pcs ANX7625 fail ATE MBIST test) */
445 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_7,
446 				 ~MIPI_PLL_VCO_TUNE_REG_VAL);
447 
448 	/* Reset ODFC PLL */
449 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_7,
450 				 ~MIPI_PLL_RESET_N);
451 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_7,
452 				MIPI_PLL_RESET_N);
453 
454 	if (ret < 0)
455 		DRM_DEV_ERROR(dev, "IO error.\n");
456 
457 	return ret;
458 }
459 
460 /*
461  * The MIPI source video data exist large variation (e.g. 59Hz ~ 61Hz),
462  * anx7625 defined K ratio for matching MIPI input video clock and
463  * DP output video clock. Increase K value can match bigger video data
464  * variation. IVO panel has small variation than DP CTS spec, need
465  * decrease the K value.
466  */
467 static int anx7625_set_k_value(struct anx7625_data *ctx)
468 {
469 	struct edid *edid = (struct edid *)ctx->slimport_edid_p.edid_raw_data;
470 
471 	if (edid->mfg_id[0] == IVO_MID0 && edid->mfg_id[1] == IVO_MID1)
472 		return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
473 					 MIPI_DIGITAL_ADJ_1, 0x3B);
474 
475 	return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
476 				 MIPI_DIGITAL_ADJ_1, 0x3D);
477 }
478 
479 static int anx7625_dsi_video_timing_config(struct anx7625_data *ctx)
480 {
481 	struct device *dev = &ctx->client->dev;
482 	unsigned long m, n;
483 	u16 htotal;
484 	int ret;
485 	u8 post_divider = 0;
486 
487 	ret = anx7625_calculate_m_n(ctx->dt.pixelclock.min * 1000,
488 				    &m, &n, &post_divider);
489 
490 	if (ret) {
491 		DRM_DEV_ERROR(dev, "cannot get property m n value.\n");
492 		return ret;
493 	}
494 
495 	DRM_DEV_DEBUG_DRIVER(dev, "compute M(%lu), N(%lu), divider(%d).\n",
496 			     m, n, post_divider);
497 
498 	/* Configure pixel clock */
499 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, PIXEL_CLOCK_L,
500 				(ctx->dt.pixelclock.min / 1000) & 0xFF);
501 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, PIXEL_CLOCK_H,
502 				 (ctx->dt.pixelclock.min / 1000) >> 8);
503 	/* Lane count */
504 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client,
505 			MIPI_LANE_CTRL_0, 0xfc);
506 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client,
507 				MIPI_LANE_CTRL_0, ctx->pdata.mipi_lanes - 1);
508 
509 	/* Htotal */
510 	htotal = ctx->dt.hactive.min + ctx->dt.hfront_porch.min +
511 		ctx->dt.hback_porch.min + ctx->dt.hsync_len.min;
512 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
513 			HORIZONTAL_TOTAL_PIXELS_L, htotal & 0xFF);
514 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
515 			HORIZONTAL_TOTAL_PIXELS_H, htotal >> 8);
516 	/* Hactive */
517 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
518 			HORIZONTAL_ACTIVE_PIXELS_L, ctx->dt.hactive.min & 0xFF);
519 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
520 			HORIZONTAL_ACTIVE_PIXELS_H, ctx->dt.hactive.min >> 8);
521 	/* HFP */
522 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
523 			HORIZONTAL_FRONT_PORCH_L, ctx->dt.hfront_porch.min);
524 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
525 			HORIZONTAL_FRONT_PORCH_H,
526 			ctx->dt.hfront_porch.min >> 8);
527 	/* HWS */
528 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
529 			HORIZONTAL_SYNC_WIDTH_L, ctx->dt.hsync_len.min);
530 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
531 			HORIZONTAL_SYNC_WIDTH_H, ctx->dt.hsync_len.min >> 8);
532 	/* HBP */
533 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
534 			HORIZONTAL_BACK_PORCH_L, ctx->dt.hback_porch.min);
535 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
536 			HORIZONTAL_BACK_PORCH_H, ctx->dt.hback_porch.min >> 8);
537 	/* Vactive */
538 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client, ACTIVE_LINES_L,
539 			ctx->dt.vactive.min);
540 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client, ACTIVE_LINES_H,
541 			ctx->dt.vactive.min >> 8);
542 	/* VFP */
543 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
544 			VERTICAL_FRONT_PORCH, ctx->dt.vfront_porch.min);
545 	/* VWS */
546 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
547 			VERTICAL_SYNC_WIDTH, ctx->dt.vsync_len.min);
548 	/* VBP */
549 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
550 			VERTICAL_BACK_PORCH, ctx->dt.vback_porch.min);
551 	/* M value */
552 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
553 			MIPI_PLL_M_NUM_23_16, (m >> 16) & 0xff);
554 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
555 			MIPI_PLL_M_NUM_15_8, (m >> 8) & 0xff);
556 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
557 			MIPI_PLL_M_NUM_7_0, (m & 0xff));
558 	/* N value */
559 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
560 			MIPI_PLL_N_NUM_23_16, (n >> 16) & 0xff);
561 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
562 			MIPI_PLL_N_NUM_15_8, (n >> 8) & 0xff);
563 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, MIPI_PLL_N_NUM_7_0,
564 			(n & 0xff));
565 
566 	anx7625_set_k_value(ctx);
567 
568 	ret |= anx7625_odfc_config(ctx, post_divider - 1);
569 
570 	if (ret < 0)
571 		DRM_DEV_ERROR(dev, "mipi dsi setup IO error.\n");
572 
573 	return ret;
574 }
575 
576 static int anx7625_swap_dsi_lane3(struct anx7625_data *ctx)
577 {
578 	int val;
579 	struct device *dev = &ctx->client->dev;
580 
581 	/* Swap MIPI-DSI data lane 3 P and N */
582 	val = anx7625_reg_read(ctx, ctx->i2c.rx_p1_client, MIPI_SWAP);
583 	if (val < 0) {
584 		DRM_DEV_ERROR(dev, "IO error : access MIPI_SWAP.\n");
585 		return -EIO;
586 	}
587 
588 	val |= (1 << MIPI_SWAP_CH3);
589 	return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, MIPI_SWAP, val);
590 }
591 
592 static int anx7625_api_dsi_config(struct anx7625_data *ctx)
593 
594 {
595 	int val, ret;
596 	struct device *dev = &ctx->client->dev;
597 
598 	/* Swap MIPI-DSI data lane 3 P and N */
599 	ret = anx7625_swap_dsi_lane3(ctx);
600 	if (ret < 0) {
601 		DRM_DEV_ERROR(dev, "IO error : swap dsi lane 3 fail.\n");
602 		return ret;
603 	}
604 
605 	/* DSI clock settings */
606 	val = (0 << MIPI_HS_PWD_CLK)		|
607 		(0 << MIPI_HS_RT_CLK)		|
608 		(0 << MIPI_PD_CLK)		|
609 		(1 << MIPI_CLK_RT_MANUAL_PD_EN)	|
610 		(1 << MIPI_CLK_HS_MANUAL_PD_EN)	|
611 		(0 << MIPI_CLK_DET_DET_BYPASS)	|
612 		(0 << MIPI_CLK_MISS_CTRL)	|
613 		(0 << MIPI_PD_LPTX_CH_MANUAL_PD_EN);
614 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
615 				MIPI_PHY_CONTROL_3, val);
616 
617 	/*
618 	 * Decreased HS prepare timing delay from 160ns to 80ns work with
619 	 *     a) Dragon board 810 series (Qualcomm AP)
620 	 *     b) Moving Pixel DSI source (PG3A pattern generator +
621 	 *	P332 D-PHY Probe) default D-PHY timing
622 	 *	5ns/step
623 	 */
624 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
625 				 MIPI_TIME_HS_PRPR, 0x10);
626 
627 	/* Enable DSI mode*/
628 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_18,
629 				SELECT_DSI << MIPI_DPI_SELECT);
630 
631 	ret |= anx7625_dsi_video_timing_config(ctx);
632 	if (ret < 0) {
633 		DRM_DEV_ERROR(dev, "dsi video timing config fail\n");
634 		return ret;
635 	}
636 
637 	/* Toggle m, n ready */
638 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_6,
639 				~(MIPI_M_NUM_READY | MIPI_N_NUM_READY));
640 	usleep_range(1000, 1100);
641 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_6,
642 				MIPI_M_NUM_READY | MIPI_N_NUM_READY);
643 
644 	/* Configure integer stable register */
645 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
646 				 MIPI_VIDEO_STABLE_CNT, 0x02);
647 	/* Power on MIPI RX */
648 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
649 				 MIPI_LANE_CTRL_10, 0x00);
650 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
651 				 MIPI_LANE_CTRL_10, 0x80);
652 
653 	if (ret < 0)
654 		DRM_DEV_ERROR(dev, "IO error : mipi dsi enable init fail.\n");
655 
656 	return ret;
657 }
658 
659 static int anx7625_dsi_config(struct anx7625_data *ctx)
660 {
661 	struct device *dev = &ctx->client->dev;
662 	int ret;
663 
664 	DRM_DEV_DEBUG_DRIVER(dev, "config dsi.\n");
665 
666 	/* DSC disable */
667 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
668 				R_DSC_CTRL_0, ~DSC_EN);
669 
670 	ret |= anx7625_api_dsi_config(ctx);
671 
672 	if (ret < 0) {
673 		DRM_DEV_ERROR(dev, "IO error : api dsi config error.\n");
674 		return ret;
675 	}
676 
677 	/* Set MIPI RX EN */
678 	ret = anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
679 			       AP_AV_STATUS, AP_MIPI_RX_EN);
680 	/* Clear mute flag */
681 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
682 				 AP_AV_STATUS, (u8)~AP_MIPI_MUTE);
683 	if (ret < 0)
684 		DRM_DEV_ERROR(dev, "IO error : enable mipi rx fail.\n");
685 	else
686 		DRM_DEV_DEBUG_DRIVER(dev, "success to config DSI\n");
687 
688 	return ret;
689 }
690 
691 static int anx7625_api_dpi_config(struct anx7625_data *ctx)
692 {
693 	struct device *dev = &ctx->client->dev;
694 	u16 freq = ctx->dt.pixelclock.min / 1000;
695 	int ret;
696 
697 	/* configure pixel clock */
698 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
699 				PIXEL_CLOCK_L, freq & 0xFF);
700 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
701 				 PIXEL_CLOCK_H, (freq >> 8));
702 
703 	/* set DPI mode */
704 	/* set to DPI PLL module sel */
705 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
706 				 MIPI_DIGITAL_PLL_9, 0x20);
707 	/* power down MIPI */
708 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
709 				 MIPI_LANE_CTRL_10, 0x08);
710 	/* enable DPI mode */
711 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
712 				 MIPI_DIGITAL_PLL_18, 0x1C);
713 	/* set first edge */
714 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
715 				 VIDEO_CONTROL_0, 0x06);
716 	if (ret < 0)
717 		DRM_DEV_ERROR(dev, "IO error : dpi phy set failed.\n");
718 
719 	return ret;
720 }
721 
722 static int anx7625_dpi_config(struct anx7625_data *ctx)
723 {
724 	struct device *dev = &ctx->client->dev;
725 	int ret;
726 
727 	DRM_DEV_DEBUG_DRIVER(dev, "config dpi\n");
728 
729 	/* DSC disable */
730 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
731 				R_DSC_CTRL_0, ~DSC_EN);
732 	if (ret < 0) {
733 		DRM_DEV_ERROR(dev, "IO error : disable dsc failed.\n");
734 		return ret;
735 	}
736 
737 	ret = anx7625_config_bit_matrix(ctx);
738 	if (ret < 0) {
739 		DRM_DEV_ERROR(dev, "config bit matrix failed.\n");
740 		return ret;
741 	}
742 
743 	ret = anx7625_api_dpi_config(ctx);
744 	if (ret < 0) {
745 		DRM_DEV_ERROR(dev, "mipi phy(dpi) setup failed.\n");
746 		return ret;
747 	}
748 
749 	/* set MIPI RX EN */
750 	ret = anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
751 			       AP_AV_STATUS, AP_MIPI_RX_EN);
752 	/* clear mute flag */
753 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
754 				 AP_AV_STATUS, (u8)~AP_MIPI_MUTE);
755 	if (ret < 0)
756 		DRM_DEV_ERROR(dev, "IO error : enable mipi rx failed.\n");
757 
758 	return ret;
759 }
760 
761 static int anx7625_read_flash_status(struct anx7625_data *ctx)
762 {
763 	return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, R_RAM_CTRL);
764 }
765 
766 static int anx7625_hdcp_key_probe(struct anx7625_data *ctx)
767 {
768 	int ret, val;
769 	struct device *dev = &ctx->client->dev;
770 	u8 ident[FLASH_BUF_LEN];
771 
772 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
773 				FLASH_ADDR_HIGH, 0x91);
774 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
775 				 FLASH_ADDR_LOW, 0xA0);
776 	if (ret < 0) {
777 		dev_err(dev, "IO error : set key flash address.\n");
778 		return ret;
779 	}
780 
781 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
782 				FLASH_LEN_HIGH, (FLASH_BUF_LEN - 1) >> 8);
783 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
784 				 FLASH_LEN_LOW, (FLASH_BUF_LEN - 1) & 0xFF);
785 	if (ret < 0) {
786 		dev_err(dev, "IO error : set key flash len.\n");
787 		return ret;
788 	}
789 
790 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
791 				R_FLASH_RW_CTRL, FLASH_READ);
792 	ret |= readx_poll_timeout(anx7625_read_flash_status,
793 				  ctx, val,
794 				  ((val & FLASH_DONE) || (val < 0)),
795 				  2000,
796 				  2000 * 150);
797 	if (ret) {
798 		dev_err(dev, "flash read access fail!\n");
799 		return -EIO;
800 	}
801 
802 	ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
803 				     FLASH_BUF_BASE_ADDR,
804 				     FLASH_BUF_LEN, ident);
805 	if (ret < 0) {
806 		dev_err(dev, "read flash data fail!\n");
807 		return -EIO;
808 	}
809 
810 	if (ident[29] == 0xFF && ident[30] == 0xFF && ident[31] == 0xFF)
811 		return -EINVAL;
812 
813 	return 0;
814 }
815 
816 static int anx7625_hdcp_key_load(struct anx7625_data *ctx)
817 {
818 	int ret;
819 	struct device *dev = &ctx->client->dev;
820 
821 	/* Select HDCP 1.4 KEY */
822 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
823 				R_BOOT_RETRY, 0x12);
824 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
825 				 FLASH_ADDR_HIGH, HDCP14KEY_START_ADDR >> 8);
826 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
827 				 FLASH_ADDR_LOW, HDCP14KEY_START_ADDR & 0xFF);
828 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
829 				 R_RAM_LEN_H, HDCP14KEY_SIZE >> 12);
830 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
831 				 R_RAM_LEN_L, HDCP14KEY_SIZE >> 4);
832 
833 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
834 				 R_RAM_ADDR_H, 0);
835 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
836 				 R_RAM_ADDR_L, 0);
837 	/* Enable HDCP 1.4 KEY load */
838 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
839 				 R_RAM_CTRL, DECRYPT_EN | LOAD_START);
840 	dev_dbg(dev, "load HDCP 1.4 key done\n");
841 	return ret;
842 }
843 
844 static int anx7625_hdcp_disable(struct anx7625_data *ctx)
845 {
846 	int ret;
847 	struct device *dev = &ctx->client->dev;
848 
849 	dev_dbg(dev, "disable HDCP 1.4\n");
850 
851 	/* Disable HDCP */
852 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);
853 	/* Try auth flag */
854 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
855 	/* Interrupt for DRM */
856 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
857 	if (ret < 0)
858 		dev_err(dev, "fail to disable HDCP\n");
859 
860 	return anx7625_write_and(ctx, ctx->i2c.tx_p0_client,
861 				 TX_HDCP_CTRL0, ~HARD_AUTH_EN & 0xFF);
862 }
863 
864 static int anx7625_hdcp_enable(struct anx7625_data *ctx)
865 {
866 	u8 bcap;
867 	int ret;
868 	struct device *dev = &ctx->client->dev;
869 
870 	ret = anx7625_hdcp_key_probe(ctx);
871 	if (ret) {
872 		dev_dbg(dev, "no key found, not to do hdcp\n");
873 		return ret;
874 	}
875 
876 	/* Read downstream capability */
877 	ret = anx7625_aux_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap);
878 	if (ret < 0)
879 		return ret;
880 
881 	if (!(bcap & 0x01)) {
882 		pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap);
883 		return 0;
884 	}
885 
886 	dev_dbg(dev, "enable HDCP 1.4\n");
887 
888 	/* First clear HDCP state */
889 	ret = anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
890 				TX_HDCP_CTRL0,
891 				KSVLIST_VLD | BKSV_SRM_PASS | RE_AUTHEN);
892 	usleep_range(1000, 1100);
893 	/* Second clear HDCP state */
894 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
895 				 TX_HDCP_CTRL0,
896 				 KSVLIST_VLD | BKSV_SRM_PASS | RE_AUTHEN);
897 
898 	/* Set time for waiting KSVR */
899 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
900 				 SP_TX_WAIT_KSVR_TIME, 0xc8);
901 	/* Set time for waiting R0 */
902 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
903 				 SP_TX_WAIT_R0_TIME, 0xb0);
904 	ret |= anx7625_hdcp_key_load(ctx);
905 	if (ret) {
906 		pr_warn("prepare HDCP key failed.\n");
907 		return ret;
908 	}
909 
910 	ret = anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xee, 0x20);
911 
912 	/* Try auth flag */
913 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
914 	/* Interrupt for DRM */
915 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
916 	if (ret < 0)
917 		dev_err(dev, "fail to enable HDCP\n");
918 
919 	return anx7625_write_or(ctx, ctx->i2c.tx_p0_client,
920 				TX_HDCP_CTRL0, HARD_AUTH_EN);
921 }
922 
923 static void anx7625_dp_start(struct anx7625_data *ctx)
924 {
925 	int ret;
926 	struct device *dev = &ctx->client->dev;
927 	u8 data;
928 
929 	if (!ctx->display_timing_valid) {
930 		DRM_DEV_ERROR(dev, "mipi not set display timing yet.\n");
931 		return;
932 	}
933 
934 	dev_dbg(dev, "set downstream sink into normal\n");
935 	/* Downstream sink enter into normal mode */
936 	data = 1;
937 	ret = anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
938 	if (ret < 0)
939 		dev_err(dev, "IO error : set sink into normal mode fail\n");
940 
941 	/* Disable HDCP */
942 	anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);
943 
944 	if (ctx->pdata.is_dpi)
945 		ret = anx7625_dpi_config(ctx);
946 	else
947 		ret = anx7625_dsi_config(ctx);
948 
949 	if (ret < 0)
950 		DRM_DEV_ERROR(dev, "MIPI phy setup error.\n");
951 
952 	ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
953 
954 	ctx->dp_en = 1;
955 }
956 
957 static void anx7625_dp_stop(struct anx7625_data *ctx)
958 {
959 	struct device *dev = &ctx->client->dev;
960 	int ret;
961 	u8 data;
962 
963 	DRM_DEV_DEBUG_DRIVER(dev, "stop dp output\n");
964 
965 	/*
966 	 * Video disable: 0x72:08 bit 7 = 0;
967 	 * Audio disable: 0x70:87 bit 0 = 0;
968 	 */
969 	ret = anx7625_write_and(ctx, ctx->i2c.tx_p0_client, 0x87, 0xfe);
970 	ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client, 0x08, 0x7f);
971 
972 	ret |= anx7625_video_mute_control(ctx, 1);
973 
974 	dev_dbg(dev, "notify downstream enter into standby\n");
975 	/* Downstream monitor enter into standby mode */
976 	data = 2;
977 	ret |= anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
978 	if (ret < 0)
979 		DRM_DEV_ERROR(dev, "IO error : mute video fail\n");
980 
981 	ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
982 
983 	ctx->dp_en = 0;
984 }
985 
986 static int sp_tx_rst_aux(struct anx7625_data *ctx)
987 {
988 	int ret;
989 
990 	ret = anx7625_write_or(ctx, ctx->i2c.tx_p2_client, RST_CTRL2,
991 			       AUX_RST);
992 	ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client, RST_CTRL2,
993 				 ~AUX_RST);
994 	return ret;
995 }
996 
997 static int sp_tx_aux_wr(struct anx7625_data *ctx, u8 offset)
998 {
999 	int ret;
1000 
1001 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1002 				AP_AUX_BUFF_START, offset);
1003 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1004 				 AP_AUX_COMMAND, 0x04);
1005 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
1006 				AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
1007 	return (ret | wait_aux_op_finish(ctx));
1008 }
1009 
1010 static int sp_tx_aux_rd(struct anx7625_data *ctx, u8 len_cmd)
1011 {
1012 	int ret;
1013 
1014 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1015 				AP_AUX_COMMAND, len_cmd);
1016 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
1017 				AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
1018 	return (ret | wait_aux_op_finish(ctx));
1019 }
1020 
1021 static int sp_tx_get_edid_block(struct anx7625_data *ctx)
1022 {
1023 	int c = 0;
1024 	struct device *dev = &ctx->client->dev;
1025 
1026 	sp_tx_aux_wr(ctx, 0x7e);
1027 	sp_tx_aux_rd(ctx, 0x01);
1028 	c = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, AP_AUX_BUFF_START);
1029 	if (c < 0) {
1030 		DRM_DEV_ERROR(dev, "IO error : access AUX BUFF.\n");
1031 		return -EIO;
1032 	}
1033 
1034 	DRM_DEV_DEBUG_DRIVER(dev, " EDID Block = %d\n", c + 1);
1035 
1036 	if (c > MAX_EDID_BLOCK)
1037 		c = 1;
1038 
1039 	return c;
1040 }
1041 
1042 static int edid_read(struct anx7625_data *ctx,
1043 		     u8 offset, u8 *pblock_buf)
1044 {
1045 	int ret, cnt;
1046 	struct device *dev = &ctx->client->dev;
1047 
1048 	for (cnt = 0; cnt <= EDID_TRY_CNT; cnt++) {
1049 		sp_tx_aux_wr(ctx, offset);
1050 		/* Set I2C read com 0x01 mot = 0 and read 16 bytes */
1051 		ret = sp_tx_aux_rd(ctx, 0xf1);
1052 
1053 		if (ret) {
1054 			ret = sp_tx_rst_aux(ctx);
1055 			DRM_DEV_DEBUG_DRIVER(dev, "edid read fail, reset!\n");
1056 		} else {
1057 			ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
1058 						     AP_AUX_BUFF_START,
1059 						     MAX_DPCD_BUFFER_SIZE,
1060 						     pblock_buf);
1061 			if (ret > 0)
1062 				break;
1063 		}
1064 	}
1065 
1066 	if (cnt > EDID_TRY_CNT)
1067 		return -EIO;
1068 
1069 	return ret;
1070 }
1071 
1072 static int segments_edid_read(struct anx7625_data *ctx,
1073 			      u8 segment, u8 *buf, u8 offset)
1074 {
1075 	u8 cnt;
1076 	int ret;
1077 	struct device *dev = &ctx->client->dev;
1078 
1079 	/* Write address only */
1080 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1081 				AP_AUX_ADDR_7_0, 0x30);
1082 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1083 				 AP_AUX_COMMAND, 0x04);
1084 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1085 				 AP_AUX_CTRL_STATUS,
1086 				 AP_AUX_CTRL_ADDRONLY | AP_AUX_CTRL_OP_EN);
1087 
1088 	ret |= wait_aux_op_finish(ctx);
1089 	/* Write segment address */
1090 	ret |= sp_tx_aux_wr(ctx, segment);
1091 	/* Data read */
1092 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1093 				 AP_AUX_ADDR_7_0, 0x50);
1094 	if (ret) {
1095 		DRM_DEV_ERROR(dev, "IO error : aux initial fail.\n");
1096 		return ret;
1097 	}
1098 
1099 	for (cnt = 0; cnt <= EDID_TRY_CNT; cnt++) {
1100 		sp_tx_aux_wr(ctx, offset);
1101 		/* Set I2C read com 0x01 mot = 0 and read 16 bytes */
1102 		ret = sp_tx_aux_rd(ctx, 0xf1);
1103 
1104 		if (ret) {
1105 			ret = sp_tx_rst_aux(ctx);
1106 			DRM_DEV_ERROR(dev, "segment read fail, reset!\n");
1107 		} else {
1108 			ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
1109 						     AP_AUX_BUFF_START,
1110 						     MAX_DPCD_BUFFER_SIZE, buf);
1111 			if (ret > 0)
1112 				break;
1113 		}
1114 	}
1115 
1116 	if (cnt > EDID_TRY_CNT)
1117 		return -EIO;
1118 
1119 	return ret;
1120 }
1121 
1122 static int sp_tx_edid_read(struct anx7625_data *ctx,
1123 			   u8 *pedid_blocks_buf)
1124 {
1125 	u8 offset;
1126 	int edid_pos;
1127 	int count, blocks_num;
1128 	u8 pblock_buf[MAX_DPCD_BUFFER_SIZE];
1129 	u8 i, j;
1130 	int g_edid_break = 0;
1131 	int ret;
1132 	struct device *dev = &ctx->client->dev;
1133 
1134 	/* Address initial */
1135 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1136 				AP_AUX_ADDR_7_0, 0x50);
1137 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1138 				 AP_AUX_ADDR_15_8, 0);
1139 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
1140 				 AP_AUX_ADDR_19_16, 0xf0);
1141 	if (ret < 0) {
1142 		DRM_DEV_ERROR(dev, "access aux channel IO error.\n");
1143 		return -EIO;
1144 	}
1145 
1146 	blocks_num = sp_tx_get_edid_block(ctx);
1147 	if (blocks_num < 0)
1148 		return blocks_num;
1149 
1150 	count = 0;
1151 
1152 	do {
1153 		switch (count) {
1154 		case 0:
1155 		case 1:
1156 			for (i = 0; i < 8; i++) {
1157 				offset = (i + count * 8) * MAX_DPCD_BUFFER_SIZE;
1158 				g_edid_break = edid_read(ctx, offset,
1159 							 pblock_buf);
1160 
1161 				if (g_edid_break < 0)
1162 					break;
1163 
1164 				memcpy(&pedid_blocks_buf[offset],
1165 				       pblock_buf,
1166 				       MAX_DPCD_BUFFER_SIZE);
1167 			}
1168 
1169 			break;
1170 		case 2:
1171 			offset = 0x00;
1172 
1173 			for (j = 0; j < 8; j++) {
1174 				edid_pos = (j + count * 8) *
1175 					MAX_DPCD_BUFFER_SIZE;
1176 
1177 				if (g_edid_break == 1)
1178 					break;
1179 
1180 				ret = segments_edid_read(ctx, count / 2,
1181 							 pblock_buf, offset);
1182 				if (ret < 0)
1183 					return ret;
1184 
1185 				memcpy(&pedid_blocks_buf[edid_pos],
1186 				       pblock_buf,
1187 				       MAX_DPCD_BUFFER_SIZE);
1188 				offset = offset + 0x10;
1189 			}
1190 
1191 			break;
1192 		case 3:
1193 			offset = 0x80;
1194 
1195 			for (j = 0; j < 8; j++) {
1196 				edid_pos = (j + count * 8) *
1197 					MAX_DPCD_BUFFER_SIZE;
1198 				if (g_edid_break == 1)
1199 					break;
1200 
1201 				ret = segments_edid_read(ctx, count / 2,
1202 							 pblock_buf, offset);
1203 				if (ret < 0)
1204 					return ret;
1205 
1206 				memcpy(&pedid_blocks_buf[edid_pos],
1207 				       pblock_buf,
1208 				       MAX_DPCD_BUFFER_SIZE);
1209 				offset = offset + 0x10;
1210 			}
1211 
1212 			break;
1213 		default:
1214 			break;
1215 		}
1216 
1217 		count++;
1218 
1219 	} while (blocks_num >= count);
1220 
1221 	/* Check edid data */
1222 	if (!drm_edid_is_valid((struct edid *)pedid_blocks_buf)) {
1223 		DRM_DEV_ERROR(dev, "WARNING! edid check fail!\n");
1224 		return -EINVAL;
1225 	}
1226 
1227 	/* Reset aux channel */
1228 	ret = sp_tx_rst_aux(ctx);
1229 	if (ret < 0) {
1230 		DRM_DEV_ERROR(dev, "Failed to reset aux channel!\n");
1231 		return ret;
1232 	}
1233 
1234 	return (blocks_num + 1);
1235 }
1236 
1237 static void anx7625_power_on(struct anx7625_data *ctx)
1238 {
1239 	struct device *dev = &ctx->client->dev;
1240 	int ret, i;
1241 
1242 	if (!ctx->pdata.low_power_mode) {
1243 		DRM_DEV_DEBUG_DRIVER(dev, "not low power mode!\n");
1244 		return;
1245 	}
1246 
1247 	for (i = 0; i < ARRAY_SIZE(ctx->pdata.supplies); i++) {
1248 		ret = regulator_enable(ctx->pdata.supplies[i].consumer);
1249 		if (ret < 0) {
1250 			DRM_DEV_DEBUG_DRIVER(dev, "cannot enable supply %d: %d\n",
1251 					     i, ret);
1252 			goto reg_err;
1253 		}
1254 		usleep_range(2000, 2100);
1255 	}
1256 
1257 	usleep_range(11000, 12000);
1258 
1259 	/* Power on pin enable */
1260 	gpiod_set_value(ctx->pdata.gpio_p_on, 1);
1261 	usleep_range(10000, 11000);
1262 	/* Power reset pin enable */
1263 	gpiod_set_value(ctx->pdata.gpio_reset, 1);
1264 	usleep_range(10000, 11000);
1265 
1266 	DRM_DEV_DEBUG_DRIVER(dev, "power on !\n");
1267 	return;
1268 reg_err:
1269 	for (--i; i >= 0; i--)
1270 		regulator_disable(ctx->pdata.supplies[i].consumer);
1271 }
1272 
1273 static void anx7625_power_standby(struct anx7625_data *ctx)
1274 {
1275 	struct device *dev = &ctx->client->dev;
1276 	int ret;
1277 
1278 	if (!ctx->pdata.low_power_mode) {
1279 		DRM_DEV_DEBUG_DRIVER(dev, "not low power mode!\n");
1280 		return;
1281 	}
1282 
1283 	gpiod_set_value(ctx->pdata.gpio_reset, 0);
1284 	usleep_range(1000, 1100);
1285 	gpiod_set_value(ctx->pdata.gpio_p_on, 0);
1286 	usleep_range(1000, 1100);
1287 
1288 	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->pdata.supplies),
1289 				     ctx->pdata.supplies);
1290 	if (ret < 0)
1291 		DRM_DEV_DEBUG_DRIVER(dev, "cannot disable supplies %d\n", ret);
1292 
1293 	DRM_DEV_DEBUG_DRIVER(dev, "power down\n");
1294 }
1295 
1296 /* Basic configurations of ANX7625 */
1297 static void anx7625_config(struct anx7625_data *ctx)
1298 {
1299 	anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1300 			  XTAL_FRQ_SEL, XTAL_FRQ_27M);
1301 }
1302 
1303 static void anx7625_disable_pd_protocol(struct anx7625_data *ctx)
1304 {
1305 	struct device *dev = &ctx->client->dev;
1306 	int ret;
1307 
1308 	/* Reset main ocm */
1309 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, 0x88, 0x40);
1310 	/* Disable PD */
1311 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1312 				 AP_AV_STATUS, AP_DISABLE_PD);
1313 	/* Release main ocm */
1314 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, 0x88, 0x00);
1315 
1316 	if (ret < 0)
1317 		DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature fail.\n");
1318 	else
1319 		DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature succeeded.\n");
1320 }
1321 
1322 static int anx7625_ocm_loading_check(struct anx7625_data *ctx)
1323 {
1324 	int ret;
1325 	struct device *dev = &ctx->client->dev;
1326 
1327 	/* Check interface workable */
1328 	ret = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
1329 			       FLASH_LOAD_STA);
1330 	if (ret < 0) {
1331 		DRM_DEV_ERROR(dev, "IO error : access flash load.\n");
1332 		return ret;
1333 	}
1334 	if ((ret & FLASH_LOAD_STA_CHK) != FLASH_LOAD_STA_CHK)
1335 		return -ENODEV;
1336 
1337 	anx7625_disable_pd_protocol(ctx);
1338 
1339 	DRM_DEV_DEBUG_DRIVER(dev, "Firmware ver %02x%02x,",
1340 			     anx7625_reg_read(ctx,
1341 					      ctx->i2c.rx_p0_client,
1342 					      OCM_FW_VERSION),
1343 			     anx7625_reg_read(ctx,
1344 					      ctx->i2c.rx_p0_client,
1345 					      OCM_FW_REVERSION));
1346 	DRM_DEV_DEBUG_DRIVER(dev, "Driver version %s\n",
1347 			     ANX7625_DRV_VERSION);
1348 
1349 	return 0;
1350 }
1351 
1352 static void anx7625_power_on_init(struct anx7625_data *ctx)
1353 {
1354 	int retry_count, i;
1355 
1356 	for (retry_count = 0; retry_count < 3; retry_count++) {
1357 		anx7625_power_on(ctx);
1358 		anx7625_config(ctx);
1359 
1360 		for (i = 0; i < OCM_LOADING_TIME; i++) {
1361 			if (!anx7625_ocm_loading_check(ctx))
1362 				return;
1363 			usleep_range(1000, 1100);
1364 		}
1365 		anx7625_power_standby(ctx);
1366 	}
1367 }
1368 
1369 static void anx7625_init_gpio(struct anx7625_data *platform)
1370 {
1371 	struct device *dev = &platform->client->dev;
1372 
1373 	DRM_DEV_DEBUG_DRIVER(dev, "init gpio\n");
1374 
1375 	/* Gpio for chip power enable */
1376 	platform->pdata.gpio_p_on =
1377 		devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
1378 	if (IS_ERR_OR_NULL(platform->pdata.gpio_p_on)) {
1379 		DRM_DEV_DEBUG_DRIVER(dev, "no enable gpio found\n");
1380 		platform->pdata.gpio_p_on = NULL;
1381 	}
1382 
1383 	/* Gpio for chip reset */
1384 	platform->pdata.gpio_reset =
1385 		devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
1386 	if (IS_ERR_OR_NULL(platform->pdata.gpio_reset)) {
1387 		DRM_DEV_DEBUG_DRIVER(dev, "no reset gpio found\n");
1388 		platform->pdata.gpio_reset = NULL;
1389 	}
1390 
1391 	if (platform->pdata.gpio_p_on && platform->pdata.gpio_reset) {
1392 		platform->pdata.low_power_mode = 1;
1393 		DRM_DEV_DEBUG_DRIVER(dev, "low power mode, pon %d, reset %d.\n",
1394 				     desc_to_gpio(platform->pdata.gpio_p_on),
1395 				     desc_to_gpio(platform->pdata.gpio_reset));
1396 	} else {
1397 		platform->pdata.low_power_mode = 0;
1398 		DRM_DEV_DEBUG_DRIVER(dev, "not low power mode.\n");
1399 	}
1400 }
1401 
1402 static void anx7625_stop_dp_work(struct anx7625_data *ctx)
1403 {
1404 	ctx->hpd_status = 0;
1405 	ctx->hpd_high_cnt = 0;
1406 	ctx->display_timing_valid = 0;
1407 }
1408 
1409 static void anx7625_start_dp_work(struct anx7625_data *ctx)
1410 {
1411 	int ret;
1412 	struct device *dev = &ctx->client->dev;
1413 
1414 	if (ctx->hpd_high_cnt >= 2) {
1415 		DRM_DEV_DEBUG_DRIVER(dev, "filter useless HPD\n");
1416 		return;
1417 	}
1418 
1419 	ctx->hpd_status = 1;
1420 	ctx->hpd_high_cnt++;
1421 
1422 	/* Not support HDCP */
1423 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);
1424 
1425 	/* Try auth flag */
1426 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
1427 	/* Interrupt for DRM */
1428 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
1429 	if (ret < 0) {
1430 		DRM_DEV_ERROR(dev, "fail to setting HDCP/auth\n");
1431 		return;
1432 	}
1433 
1434 	ret = anx7625_reg_read(ctx, ctx->i2c.rx_p1_client, 0x86);
1435 	if (ret < 0)
1436 		return;
1437 
1438 	DRM_DEV_DEBUG_DRIVER(dev, "Secure OCM version=%02x\n", ret);
1439 }
1440 
1441 static int anx7625_read_hpd_status_p0(struct anx7625_data *ctx)
1442 {
1443 	int ret;
1444 
1445 	/* Set irq detect window to 2ms */
1446 	ret = anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
1447 				HPD_DET_TIMER_BIT0_7, HPD_TIME & 0xFF);
1448 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
1449 				 HPD_DET_TIMER_BIT8_15,
1450 				 (HPD_TIME >> 8) & 0xFF);
1451 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
1452 				 HPD_DET_TIMER_BIT16_23,
1453 				 (HPD_TIME >> 16) & 0xFF);
1454 	if (ret < 0)
1455 		return ret;
1456 
1457 	return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
1458 }
1459 
1460 static int _anx7625_hpd_polling(struct anx7625_data *ctx,
1461 				unsigned long wait_us)
1462 {
1463 	int ret, val;
1464 	struct device *dev = &ctx->client->dev;
1465 
1466 	/* Interrupt mode, no need poll HPD status, just return */
1467 	if (ctx->pdata.intp_irq)
1468 		return 0;
1469 
1470 	ret = readx_poll_timeout(anx7625_read_hpd_status_p0,
1471 				 ctx, val,
1472 				 ((val & HPD_STATUS) || (val < 0)),
1473 				 wait_us / 100,
1474 				 wait_us);
1475 	if (ret) {
1476 		DRM_DEV_ERROR(dev, "no hpd.\n");
1477 		return ret;
1478 	}
1479 
1480 	DRM_DEV_DEBUG_DRIVER(dev, "system status: 0x%x. HPD raise up.\n", val);
1481 	anx7625_reg_write(ctx, ctx->i2c.tcpc_client,
1482 			  INTR_ALERT_1, 0xFF);
1483 	anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1484 			  INTERFACE_CHANGE_INT, 0);
1485 
1486 	anx7625_start_dp_work(ctx);
1487 
1488 	if (!ctx->pdata.panel_bridge && ctx->bridge_attached)
1489 		drm_helper_hpd_irq_event(ctx->bridge.dev);
1490 
1491 	return 0;
1492 }
1493 
1494 static int anx7625_wait_hpd_asserted(struct drm_dp_aux *aux,
1495 				     unsigned long wait_us)
1496 {
1497 	struct anx7625_data *ctx = container_of(aux, struct anx7625_data, aux);
1498 	struct device *dev = &ctx->client->dev;
1499 	int ret;
1500 
1501 	pm_runtime_get_sync(dev);
1502 	ret = _anx7625_hpd_polling(ctx, wait_us);
1503 	pm_runtime_mark_last_busy(dev);
1504 	pm_runtime_put_autosuspend(dev);
1505 
1506 	return ret;
1507 }
1508 
1509 static void anx7625_remove_edid(struct anx7625_data *ctx)
1510 {
1511 	ctx->slimport_edid_p.edid_block_num = -1;
1512 }
1513 
1514 static void anx7625_dp_adjust_swing(struct anx7625_data *ctx)
1515 {
1516 	int i;
1517 
1518 	for (i = 0; i < ctx->pdata.dp_lane0_swing_reg_cnt; i++)
1519 		anx7625_reg_write(ctx, ctx->i2c.tx_p1_client,
1520 				  DP_TX_LANE0_SWING_REG0 + i,
1521 				  ctx->pdata.lane0_reg_data[i]);
1522 
1523 	for (i = 0; i < ctx->pdata.dp_lane1_swing_reg_cnt; i++)
1524 		anx7625_reg_write(ctx, ctx->i2c.tx_p1_client,
1525 				  DP_TX_LANE1_SWING_REG0 + i,
1526 				  ctx->pdata.lane1_reg_data[i]);
1527 }
1528 
1529 static void dp_hpd_change_handler(struct anx7625_data *ctx, bool on)
1530 {
1531 	struct device *dev = &ctx->client->dev;
1532 
1533 	/* HPD changed */
1534 	DRM_DEV_DEBUG_DRIVER(dev, "dp_hpd_change_default_func: %d\n",
1535 			     (u32)on);
1536 
1537 	if (on == 0) {
1538 		DRM_DEV_DEBUG_DRIVER(dev, " HPD low\n");
1539 		anx7625_remove_edid(ctx);
1540 		anx7625_stop_dp_work(ctx);
1541 	} else {
1542 		DRM_DEV_DEBUG_DRIVER(dev, " HPD high\n");
1543 		anx7625_start_dp_work(ctx);
1544 		anx7625_dp_adjust_swing(ctx);
1545 	}
1546 }
1547 
1548 static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
1549 {
1550 	int intr_vector, status;
1551 	struct device *dev = &ctx->client->dev;
1552 
1553 	status = anx7625_reg_write(ctx, ctx->i2c.tcpc_client,
1554 				   INTR_ALERT_1, 0xFF);
1555 	if (status < 0) {
1556 		DRM_DEV_ERROR(dev, "cannot clear alert reg.\n");
1557 		return status;
1558 	}
1559 
1560 	intr_vector = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
1561 				       INTERFACE_CHANGE_INT);
1562 	if (intr_vector < 0) {
1563 		DRM_DEV_ERROR(dev, "cannot access interrupt change reg.\n");
1564 		return intr_vector;
1565 	}
1566 	DRM_DEV_DEBUG_DRIVER(dev, "0x7e:0x44=%x\n", intr_vector);
1567 	status = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1568 				   INTERFACE_CHANGE_INT,
1569 				   intr_vector & (~intr_vector));
1570 	if (status < 0) {
1571 		DRM_DEV_ERROR(dev, "cannot clear interrupt change reg.\n");
1572 		return status;
1573 	}
1574 
1575 	if (!(intr_vector & HPD_STATUS_CHANGE))
1576 		return -ENOENT;
1577 
1578 	status = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
1579 				  SYSTEM_STSTUS);
1580 	if (status < 0) {
1581 		DRM_DEV_ERROR(dev, "cannot clear interrupt status.\n");
1582 		return status;
1583 	}
1584 
1585 	DRM_DEV_DEBUG_DRIVER(dev, "0x7e:0x45=%x\n", status);
1586 	dp_hpd_change_handler(ctx, status & HPD_STATUS);
1587 
1588 	return 0;
1589 }
1590 
1591 static void anx7625_work_func(struct work_struct *work)
1592 {
1593 	int event;
1594 	struct anx7625_data *ctx = container_of(work,
1595 						struct anx7625_data, work);
1596 
1597 	mutex_lock(&ctx->lock);
1598 
1599 	if (pm_runtime_suspended(&ctx->client->dev))
1600 		goto unlock;
1601 
1602 	event = anx7625_hpd_change_detect(ctx);
1603 	if (event < 0)
1604 		goto unlock;
1605 
1606 	if (ctx->bridge_attached)
1607 		drm_helper_hpd_irq_event(ctx->bridge.dev);
1608 
1609 unlock:
1610 	mutex_unlock(&ctx->lock);
1611 }
1612 
1613 static irqreturn_t anx7625_intr_hpd_isr(int irq, void *data)
1614 {
1615 	struct anx7625_data *ctx = (struct anx7625_data *)data;
1616 
1617 	queue_work(ctx->workqueue, &ctx->work);
1618 
1619 	return IRQ_HANDLED;
1620 }
1621 
1622 static int anx7625_get_swing_setting(struct device *dev,
1623 				     struct anx7625_platform_data *pdata)
1624 {
1625 	int num_regs;
1626 
1627 	if (of_get_property(dev->of_node,
1628 			    "analogix,lane0-swing", &num_regs)) {
1629 		if (num_regs > DP_TX_SWING_REG_CNT)
1630 			num_regs = DP_TX_SWING_REG_CNT;
1631 
1632 		pdata->dp_lane0_swing_reg_cnt = num_regs;
1633 		of_property_read_u8_array(dev->of_node, "analogix,lane0-swing",
1634 					  pdata->lane0_reg_data, num_regs);
1635 	}
1636 
1637 	if (of_get_property(dev->of_node,
1638 			    "analogix,lane1-swing", &num_regs)) {
1639 		if (num_regs > DP_TX_SWING_REG_CNT)
1640 			num_regs = DP_TX_SWING_REG_CNT;
1641 
1642 		pdata->dp_lane1_swing_reg_cnt = num_regs;
1643 		of_property_read_u8_array(dev->of_node, "analogix,lane1-swing",
1644 					  pdata->lane1_reg_data, num_regs);
1645 	}
1646 
1647 	return 0;
1648 }
1649 
1650 static int anx7625_parse_dt(struct device *dev,
1651 			    struct anx7625_platform_data *pdata)
1652 {
1653 	struct device_node *np = dev->of_node, *ep0;
1654 	int bus_type, mipi_lanes;
1655 
1656 	anx7625_get_swing_setting(dev, pdata);
1657 
1658 	pdata->is_dpi = 0; /* default dsi mode */
1659 	of_node_put(pdata->mipi_host_node);
1660 	pdata->mipi_host_node = of_graph_get_remote_node(np, 0, 0);
1661 	if (!pdata->mipi_host_node) {
1662 		DRM_DEV_ERROR(dev, "fail to get internal panel.\n");
1663 		return -ENODEV;
1664 	}
1665 
1666 	bus_type = 0;
1667 	mipi_lanes = MAX_LANES_SUPPORT;
1668 	ep0 = of_graph_get_endpoint_by_regs(np, 0, 0);
1669 	if (ep0) {
1670 		if (of_property_read_u32(ep0, "bus-type", &bus_type))
1671 			bus_type = 0;
1672 
1673 		mipi_lanes = drm_of_get_data_lanes_count(ep0, 1, MAX_LANES_SUPPORT);
1674 		of_node_put(ep0);
1675 	}
1676 
1677 	if (bus_type == V4L2_FWNODE_BUS_TYPE_DPI) /* bus type is DPI */
1678 		pdata->is_dpi = 1;
1679 
1680 	pdata->mipi_lanes = MAX_LANES_SUPPORT;
1681 	if (mipi_lanes > 0)
1682 		pdata->mipi_lanes = mipi_lanes;
1683 
1684 	if (pdata->is_dpi)
1685 		DRM_DEV_DEBUG_DRIVER(dev, "found MIPI DPI host node.\n");
1686 	else
1687 		DRM_DEV_DEBUG_DRIVER(dev, "found MIPI DSI host node.\n");
1688 
1689 	if (of_property_read_bool(np, "analogix,audio-enable"))
1690 		pdata->audio_en = 1;
1691 
1692 	pdata->panel_bridge = devm_drm_of_get_bridge(dev, np, 1, 0);
1693 	if (IS_ERR(pdata->panel_bridge)) {
1694 		if (PTR_ERR(pdata->panel_bridge) == -ENODEV) {
1695 			pdata->panel_bridge = NULL;
1696 			return 0;
1697 		}
1698 
1699 		return PTR_ERR(pdata->panel_bridge);
1700 	}
1701 
1702 	DRM_DEV_DEBUG_DRIVER(dev, "get panel node.\n");
1703 
1704 	return 0;
1705 }
1706 
1707 static bool anx7625_of_panel_on_aux_bus(struct device *dev)
1708 {
1709 	struct device_node *bus, *panel;
1710 
1711 	bus = of_get_child_by_name(dev->of_node, "aux-bus");
1712 	if (!bus)
1713 		return false;
1714 
1715 	panel = of_get_child_by_name(bus, "panel");
1716 	of_node_put(bus);
1717 	if (!panel)
1718 		return false;
1719 	of_node_put(panel);
1720 
1721 	return true;
1722 }
1723 
1724 static inline struct anx7625_data *bridge_to_anx7625(struct drm_bridge *bridge)
1725 {
1726 	return container_of(bridge, struct anx7625_data, bridge);
1727 }
1728 
1729 static ssize_t anx7625_aux_transfer(struct drm_dp_aux *aux,
1730 				    struct drm_dp_aux_msg *msg)
1731 {
1732 	struct anx7625_data *ctx = container_of(aux, struct anx7625_data, aux);
1733 	struct device *dev = &ctx->client->dev;
1734 	u8 request = msg->request & ~DP_AUX_I2C_MOT;
1735 	int ret = 0;
1736 
1737 	pm_runtime_get_sync(dev);
1738 	msg->reply = 0;
1739 	switch (request) {
1740 	case DP_AUX_NATIVE_WRITE:
1741 	case DP_AUX_I2C_WRITE:
1742 	case DP_AUX_NATIVE_READ:
1743 	case DP_AUX_I2C_READ:
1744 		break;
1745 	default:
1746 		ret = -EINVAL;
1747 	}
1748 	if (!ret)
1749 		ret = anx7625_aux_trans(ctx, msg->request, msg->address,
1750 					msg->size, msg->buffer);
1751 	pm_runtime_mark_last_busy(dev);
1752 	pm_runtime_put_autosuspend(dev);
1753 
1754 	return ret;
1755 }
1756 
1757 static struct edid *anx7625_get_edid(struct anx7625_data *ctx)
1758 {
1759 	struct device *dev = &ctx->client->dev;
1760 	struct s_edid_data *p_edid = &ctx->slimport_edid_p;
1761 	int edid_num;
1762 	u8 *edid;
1763 
1764 	edid = kmalloc(FOUR_BLOCK_SIZE, GFP_KERNEL);
1765 	if (!edid) {
1766 		DRM_DEV_ERROR(dev, "Fail to allocate buffer\n");
1767 		return NULL;
1768 	}
1769 
1770 	if (ctx->slimport_edid_p.edid_block_num > 0) {
1771 		memcpy(edid, ctx->slimport_edid_p.edid_raw_data,
1772 		       FOUR_BLOCK_SIZE);
1773 		return (struct edid *)edid;
1774 	}
1775 
1776 	pm_runtime_get_sync(dev);
1777 	_anx7625_hpd_polling(ctx, 5000 * 100);
1778 	edid_num = sp_tx_edid_read(ctx, p_edid->edid_raw_data);
1779 	pm_runtime_put_sync(dev);
1780 
1781 	if (edid_num < 1) {
1782 		DRM_DEV_ERROR(dev, "Fail to read EDID: %d\n", edid_num);
1783 		kfree(edid);
1784 		return NULL;
1785 	}
1786 
1787 	p_edid->edid_block_num = edid_num;
1788 
1789 	memcpy(edid, ctx->slimport_edid_p.edid_raw_data, FOUR_BLOCK_SIZE);
1790 	return (struct edid *)edid;
1791 }
1792 
1793 static enum drm_connector_status anx7625_sink_detect(struct anx7625_data *ctx)
1794 {
1795 	struct device *dev = &ctx->client->dev;
1796 
1797 	DRM_DEV_DEBUG_DRIVER(dev, "sink detect\n");
1798 
1799 	if (ctx->pdata.panel_bridge)
1800 		return connector_status_connected;
1801 
1802 	return ctx->hpd_status ? connector_status_connected :
1803 				     connector_status_disconnected;
1804 }
1805 
1806 static int anx7625_audio_hw_params(struct device *dev, void *data,
1807 				   struct hdmi_codec_daifmt *fmt,
1808 				   struct hdmi_codec_params *params)
1809 {
1810 	struct anx7625_data *ctx = dev_get_drvdata(dev);
1811 	int wl, ch, rate;
1812 	int ret = 0;
1813 
1814 	if (anx7625_sink_detect(ctx) == connector_status_disconnected) {
1815 		DRM_DEV_DEBUG_DRIVER(dev, "DP not connected\n");
1816 		return 0;
1817 	}
1818 
1819 	if (fmt->fmt != HDMI_DSP_A && fmt->fmt != HDMI_I2S) {
1820 		DRM_DEV_ERROR(dev, "only supports DSP_A & I2S\n");
1821 		return -EINVAL;
1822 	}
1823 
1824 	DRM_DEV_DEBUG_DRIVER(dev, "setting %d Hz, %d bit, %d channels\n",
1825 			     params->sample_rate, params->sample_width,
1826 			     params->cea.channels);
1827 
1828 	if (fmt->fmt == HDMI_DSP_A)
1829 		ret = anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1830 					   AUDIO_CHANNEL_STATUS_6,
1831 					   ~I2S_SLAVE_MODE,
1832 					   TDM_SLAVE_MODE);
1833 	else
1834 		ret = anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1835 					   AUDIO_CHANNEL_STATUS_6,
1836 					   ~TDM_SLAVE_MODE,
1837 					   I2S_SLAVE_MODE);
1838 
1839 	/* Word length */
1840 	switch (params->sample_width) {
1841 	case 16:
1842 		wl = AUDIO_W_LEN_16_20MAX;
1843 		break;
1844 	case 18:
1845 		wl = AUDIO_W_LEN_18_20MAX;
1846 		break;
1847 	case 20:
1848 		wl = AUDIO_W_LEN_20_20MAX;
1849 		break;
1850 	case 24:
1851 		wl = AUDIO_W_LEN_24_24MAX;
1852 		break;
1853 	default:
1854 		DRM_DEV_DEBUG_DRIVER(dev, "wordlength: %d bit not support",
1855 				     params->sample_width);
1856 		return -EINVAL;
1857 	}
1858 	ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1859 				    AUDIO_CHANNEL_STATUS_5,
1860 				    0xf0, wl);
1861 
1862 	/* Channel num */
1863 	switch (params->cea.channels) {
1864 	case 2:
1865 		ch = I2S_CH_2;
1866 		break;
1867 	case 4:
1868 		ch = TDM_CH_4;
1869 		break;
1870 	case 6:
1871 		ch = TDM_CH_6;
1872 		break;
1873 	case 8:
1874 		ch = TDM_CH_8;
1875 		break;
1876 	default:
1877 		DRM_DEV_DEBUG_DRIVER(dev, "channel number: %d not support",
1878 				     params->cea.channels);
1879 		return -EINVAL;
1880 	}
1881 	ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1882 			       AUDIO_CHANNEL_STATUS_6, 0x1f, ch << 5);
1883 	if (ch > I2S_CH_2)
1884 		ret |= anx7625_write_or(ctx, ctx->i2c.tx_p2_client,
1885 				AUDIO_CHANNEL_STATUS_6, AUDIO_LAYOUT);
1886 	else
1887 		ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client,
1888 				AUDIO_CHANNEL_STATUS_6, ~AUDIO_LAYOUT);
1889 
1890 	/* FS */
1891 	switch (params->sample_rate) {
1892 	case 32000:
1893 		rate = AUDIO_FS_32K;
1894 		break;
1895 	case 44100:
1896 		rate = AUDIO_FS_441K;
1897 		break;
1898 	case 48000:
1899 		rate = AUDIO_FS_48K;
1900 		break;
1901 	case 88200:
1902 		rate = AUDIO_FS_882K;
1903 		break;
1904 	case 96000:
1905 		rate = AUDIO_FS_96K;
1906 		break;
1907 	case 176400:
1908 		rate = AUDIO_FS_1764K;
1909 		break;
1910 	case 192000:
1911 		rate = AUDIO_FS_192K;
1912 		break;
1913 	default:
1914 		DRM_DEV_DEBUG_DRIVER(dev, "sample rate: %d not support",
1915 				     params->sample_rate);
1916 		return -EINVAL;
1917 	}
1918 	ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1919 				    AUDIO_CHANNEL_STATUS_4,
1920 				    0xf0, rate);
1921 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
1922 				AP_AV_STATUS, AP_AUDIO_CHG);
1923 	if (ret < 0) {
1924 		DRM_DEV_ERROR(dev, "IO error : config audio.\n");
1925 		return -EIO;
1926 	}
1927 
1928 	return 0;
1929 }
1930 
1931 static void anx7625_audio_shutdown(struct device *dev, void *data)
1932 {
1933 	DRM_DEV_DEBUG_DRIVER(dev, "stop audio\n");
1934 }
1935 
1936 static int anx7625_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
1937 				       struct device_node *endpoint)
1938 {
1939 	struct of_endpoint of_ep;
1940 	int ret;
1941 
1942 	ret = of_graph_parse_endpoint(endpoint, &of_ep);
1943 	if (ret < 0)
1944 		return ret;
1945 
1946 	/*
1947 	 * HDMI sound should be located at external DPI port
1948 	 * Didn't have good way to check where is internal(DSI)
1949 	 * or external(DPI) bridge
1950 	 */
1951 	return 0;
1952 }
1953 
1954 static void
1955 anx7625_audio_update_connector_status(struct anx7625_data *ctx,
1956 				      enum drm_connector_status status)
1957 {
1958 	if (ctx->plugged_cb && ctx->codec_dev) {
1959 		ctx->plugged_cb(ctx->codec_dev,
1960 				status == connector_status_connected);
1961 	}
1962 }
1963 
1964 static int anx7625_audio_hook_plugged_cb(struct device *dev, void *data,
1965 					 hdmi_codec_plugged_cb fn,
1966 					 struct device *codec_dev)
1967 {
1968 	struct anx7625_data *ctx = data;
1969 
1970 	ctx->plugged_cb = fn;
1971 	ctx->codec_dev = codec_dev;
1972 	anx7625_audio_update_connector_status(ctx, anx7625_sink_detect(ctx));
1973 
1974 	return 0;
1975 }
1976 
1977 static int anx7625_audio_get_eld(struct device *dev, void *data,
1978 				 u8 *buf, size_t len)
1979 {
1980 	struct anx7625_data *ctx = dev_get_drvdata(dev);
1981 
1982 	if (!ctx->connector) {
1983 		/* Pass en empty ELD if connector not available */
1984 		memset(buf, 0, len);
1985 	} else {
1986 		dev_dbg(dev, "audio copy eld\n");
1987 		memcpy(buf, ctx->connector->eld,
1988 		       min(sizeof(ctx->connector->eld), len));
1989 	}
1990 
1991 	return 0;
1992 }
1993 
1994 static const struct hdmi_codec_ops anx7625_codec_ops = {
1995 	.hw_params	= anx7625_audio_hw_params,
1996 	.audio_shutdown = anx7625_audio_shutdown,
1997 	.get_eld	= anx7625_audio_get_eld,
1998 	.get_dai_id	= anx7625_hdmi_i2s_get_dai_id,
1999 	.hook_plugged_cb = anx7625_audio_hook_plugged_cb,
2000 };
2001 
2002 static void anx7625_unregister_audio(struct anx7625_data *ctx)
2003 {
2004 	struct device *dev = &ctx->client->dev;
2005 
2006 	if (ctx->audio_pdev) {
2007 		platform_device_unregister(ctx->audio_pdev);
2008 		ctx->audio_pdev = NULL;
2009 	}
2010 
2011 	DRM_DEV_DEBUG_DRIVER(dev, "unbound to %s", HDMI_CODEC_DRV_NAME);
2012 }
2013 
2014 static int anx7625_register_audio(struct device *dev, struct anx7625_data *ctx)
2015 {
2016 	struct hdmi_codec_pdata codec_data = {
2017 		.ops = &anx7625_codec_ops,
2018 		.max_i2s_channels = 8,
2019 		.i2s = 1,
2020 		.data = ctx,
2021 	};
2022 
2023 	ctx->audio_pdev = platform_device_register_data(dev,
2024 							HDMI_CODEC_DRV_NAME,
2025 							PLATFORM_DEVID_AUTO,
2026 							&codec_data,
2027 							sizeof(codec_data));
2028 
2029 	if (IS_ERR(ctx->audio_pdev))
2030 		return PTR_ERR(ctx->audio_pdev);
2031 
2032 	DRM_DEV_DEBUG_DRIVER(dev, "bound to %s", HDMI_CODEC_DRV_NAME);
2033 
2034 	return 0;
2035 }
2036 
2037 static int anx7625_attach_dsi(struct anx7625_data *ctx)
2038 {
2039 	struct mipi_dsi_device *dsi;
2040 	struct device *dev = &ctx->client->dev;
2041 	struct mipi_dsi_host *host;
2042 	const struct mipi_dsi_device_info info = {
2043 		.type = "anx7625",
2044 		.channel = 0,
2045 		.node = NULL,
2046 	};
2047 	int ret;
2048 
2049 	DRM_DEV_DEBUG_DRIVER(dev, "attach dsi\n");
2050 
2051 	host = of_find_mipi_dsi_host_by_node(ctx->pdata.mipi_host_node);
2052 	if (!host) {
2053 		DRM_DEV_ERROR(dev, "fail to find dsi host.\n");
2054 		return -EPROBE_DEFER;
2055 	}
2056 
2057 	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
2058 	if (IS_ERR(dsi)) {
2059 		DRM_DEV_ERROR(dev, "fail to create dsi device.\n");
2060 		return -EINVAL;
2061 	}
2062 
2063 	dsi->lanes = ctx->pdata.mipi_lanes;
2064 	dsi->format = MIPI_DSI_FMT_RGB888;
2065 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO	|
2066 		MIPI_DSI_MODE_VIDEO_SYNC_PULSE	|
2067 		MIPI_DSI_MODE_VIDEO_HSE	|
2068 		MIPI_DSI_HS_PKT_END_ALIGNED;
2069 
2070 	ret = devm_mipi_dsi_attach(dev, dsi);
2071 	if (ret) {
2072 		DRM_DEV_ERROR(dev, "fail to attach dsi to host.\n");
2073 		return ret;
2074 	}
2075 
2076 	ctx->dsi = dsi;
2077 
2078 	DRM_DEV_DEBUG_DRIVER(dev, "attach dsi succeeded.\n");
2079 
2080 	return 0;
2081 }
2082 
2083 static void hdcp_check_work_func(struct work_struct *work)
2084 {
2085 	u8 status;
2086 	struct delayed_work *dwork;
2087 	struct anx7625_data *ctx;
2088 	struct device *dev;
2089 	struct drm_device *drm_dev;
2090 
2091 	dwork = to_delayed_work(work);
2092 	ctx = container_of(dwork, struct anx7625_data, hdcp_work);
2093 	dev = &ctx->client->dev;
2094 
2095 	if (!ctx->connector) {
2096 		dev_err(dev, "HDCP connector is null!");
2097 		return;
2098 	}
2099 
2100 	drm_dev = ctx->connector->dev;
2101 	drm_modeset_lock(&drm_dev->mode_config.connection_mutex, NULL);
2102 	mutex_lock(&ctx->hdcp_wq_lock);
2103 
2104 	status = anx7625_reg_read(ctx, ctx->i2c.tx_p0_client, 0);
2105 	dev_dbg(dev, "sink HDCP status check: %.02x\n", status);
2106 	if (status & BIT(1)) {
2107 		ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_ENABLED;
2108 		drm_hdcp_update_content_protection(ctx->connector,
2109 						   ctx->hdcp_cp);
2110 		dev_dbg(dev, "update CP to ENABLE\n");
2111 	}
2112 
2113 	mutex_unlock(&ctx->hdcp_wq_lock);
2114 	drm_modeset_unlock(&drm_dev->mode_config.connection_mutex);
2115 }
2116 
2117 static int anx7625_connector_atomic_check(struct anx7625_data *ctx,
2118 					  struct drm_connector_state *state)
2119 {
2120 	struct device *dev = &ctx->client->dev;
2121 	int cp;
2122 
2123 	dev_dbg(dev, "hdcp state check\n");
2124 	cp = state->content_protection;
2125 
2126 	if (cp == ctx->hdcp_cp)
2127 		return 0;
2128 
2129 	if (cp == DRM_MODE_CONTENT_PROTECTION_DESIRED) {
2130 		if (ctx->dp_en) {
2131 			dev_dbg(dev, "enable HDCP\n");
2132 			anx7625_hdcp_enable(ctx);
2133 
2134 			queue_delayed_work(ctx->hdcp_workqueue,
2135 					   &ctx->hdcp_work,
2136 					   msecs_to_jiffies(2000));
2137 		}
2138 	}
2139 
2140 	if (cp == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
2141 		if (ctx->hdcp_cp != DRM_MODE_CONTENT_PROTECTION_ENABLED) {
2142 			dev_err(dev, "current CP is not ENABLED\n");
2143 			return -EINVAL;
2144 		}
2145 		anx7625_hdcp_disable(ctx);
2146 		ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
2147 		drm_hdcp_update_content_protection(ctx->connector,
2148 						   ctx->hdcp_cp);
2149 		dev_dbg(dev, "update CP to UNDESIRE\n");
2150 	}
2151 
2152 	if (cp == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
2153 		dev_err(dev, "Userspace illegal set to PROTECTION ENABLE\n");
2154 		return -EINVAL;
2155 	}
2156 
2157 	return 0;
2158 }
2159 
2160 static int anx7625_bridge_attach(struct drm_bridge *bridge,
2161 				 enum drm_bridge_attach_flags flags)
2162 {
2163 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2164 	int err;
2165 	struct device *dev = &ctx->client->dev;
2166 
2167 	DRM_DEV_DEBUG_DRIVER(dev, "drm attach\n");
2168 	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
2169 		return -EINVAL;
2170 
2171 	if (!bridge->encoder) {
2172 		DRM_DEV_ERROR(dev, "Parent encoder object not found");
2173 		return -ENODEV;
2174 	}
2175 
2176 	ctx->aux.drm_dev = bridge->dev;
2177 	err = drm_dp_aux_register(&ctx->aux);
2178 	if (err) {
2179 		dev_err(dev, "failed to register aux channel: %d\n", err);
2180 		return err;
2181 	}
2182 
2183 	if (ctx->pdata.panel_bridge) {
2184 		err = drm_bridge_attach(bridge->encoder,
2185 					ctx->pdata.panel_bridge,
2186 					&ctx->bridge, flags);
2187 		if (err)
2188 			return err;
2189 	}
2190 
2191 	ctx->bridge_attached = 1;
2192 
2193 	return 0;
2194 }
2195 
2196 static void anx7625_bridge_detach(struct drm_bridge *bridge)
2197 {
2198 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2199 
2200 	drm_dp_aux_unregister(&ctx->aux);
2201 }
2202 
2203 static enum drm_mode_status
2204 anx7625_bridge_mode_valid(struct drm_bridge *bridge,
2205 			  const struct drm_display_info *info,
2206 			  const struct drm_display_mode *mode)
2207 {
2208 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2209 	struct device *dev = &ctx->client->dev;
2210 
2211 	DRM_DEV_DEBUG_DRIVER(dev, "drm mode checking\n");
2212 
2213 	/* Max 1200p at 5.4 Ghz, one lane, pixel clock 300M */
2214 	if (mode->clock > SUPPORT_PIXEL_CLOCK) {
2215 		DRM_DEV_DEBUG_DRIVER(dev,
2216 				     "drm mode invalid, pixelclock too high.\n");
2217 		return MODE_CLOCK_HIGH;
2218 	}
2219 
2220 	DRM_DEV_DEBUG_DRIVER(dev, "drm mode valid.\n");
2221 
2222 	return MODE_OK;
2223 }
2224 
2225 static void anx7625_bridge_mode_set(struct drm_bridge *bridge,
2226 				    const struct drm_display_mode *old_mode,
2227 				    const struct drm_display_mode *mode)
2228 {
2229 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2230 	struct device *dev = &ctx->client->dev;
2231 
2232 	DRM_DEV_DEBUG_DRIVER(dev, "drm mode set\n");
2233 
2234 	ctx->dt.pixelclock.min = mode->clock;
2235 	ctx->dt.hactive.min = mode->hdisplay;
2236 	ctx->dt.hsync_len.min = mode->hsync_end - mode->hsync_start;
2237 	ctx->dt.hfront_porch.min = mode->hsync_start - mode->hdisplay;
2238 	ctx->dt.hback_porch.min = mode->htotal - mode->hsync_end;
2239 	ctx->dt.vactive.min = mode->vdisplay;
2240 	ctx->dt.vsync_len.min = mode->vsync_end - mode->vsync_start;
2241 	ctx->dt.vfront_porch.min = mode->vsync_start - mode->vdisplay;
2242 	ctx->dt.vback_porch.min = mode->vtotal - mode->vsync_end;
2243 
2244 	ctx->display_timing_valid = 1;
2245 
2246 	DRM_DEV_DEBUG_DRIVER(dev, "pixelclock(%d).\n", ctx->dt.pixelclock.min);
2247 	DRM_DEV_DEBUG_DRIVER(dev, "hactive(%d), hsync(%d), hfp(%d), hbp(%d)\n",
2248 			     ctx->dt.hactive.min,
2249 			     ctx->dt.hsync_len.min,
2250 			     ctx->dt.hfront_porch.min,
2251 			     ctx->dt.hback_porch.min);
2252 	DRM_DEV_DEBUG_DRIVER(dev, "vactive(%d), vsync(%d), vfp(%d), vbp(%d)\n",
2253 			     ctx->dt.vactive.min,
2254 			     ctx->dt.vsync_len.min,
2255 			     ctx->dt.vfront_porch.min,
2256 			     ctx->dt.vback_porch.min);
2257 	DRM_DEV_DEBUG_DRIVER(dev, "hdisplay(%d),hsync_start(%d).\n",
2258 			     mode->hdisplay,
2259 			     mode->hsync_start);
2260 	DRM_DEV_DEBUG_DRIVER(dev, "hsync_end(%d),htotal(%d).\n",
2261 			     mode->hsync_end,
2262 			     mode->htotal);
2263 	DRM_DEV_DEBUG_DRIVER(dev, "vdisplay(%d),vsync_start(%d).\n",
2264 			     mode->vdisplay,
2265 			     mode->vsync_start);
2266 	DRM_DEV_DEBUG_DRIVER(dev, "vsync_end(%d),vtotal(%d).\n",
2267 			     mode->vsync_end,
2268 			     mode->vtotal);
2269 }
2270 
2271 static bool anx7625_bridge_mode_fixup(struct drm_bridge *bridge,
2272 				      const struct drm_display_mode *mode,
2273 				      struct drm_display_mode *adj)
2274 {
2275 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2276 	struct device *dev = &ctx->client->dev;
2277 	u32 hsync, hfp, hbp, hblanking;
2278 	u32 adj_hsync, adj_hfp, adj_hbp, adj_hblanking, delta_adj;
2279 	u32 vref, adj_clock;
2280 
2281 	DRM_DEV_DEBUG_DRIVER(dev, "drm mode fixup set\n");
2282 
2283 	/* No need fixup for external monitor */
2284 	if (!ctx->pdata.panel_bridge)
2285 		return true;
2286 
2287 	hsync = mode->hsync_end - mode->hsync_start;
2288 	hfp = mode->hsync_start - mode->hdisplay;
2289 	hbp = mode->htotal - mode->hsync_end;
2290 	hblanking = mode->htotal - mode->hdisplay;
2291 
2292 	DRM_DEV_DEBUG_DRIVER(dev, "before mode fixup\n");
2293 	DRM_DEV_DEBUG_DRIVER(dev, "hsync(%d), hfp(%d), hbp(%d), clock(%d)\n",
2294 			     hsync, hfp, hbp, adj->clock);
2295 	DRM_DEV_DEBUG_DRIVER(dev, "hsync_start(%d), hsync_end(%d), htot(%d)\n",
2296 			     adj->hsync_start, adj->hsync_end, adj->htotal);
2297 
2298 	adj_hfp = hfp;
2299 	adj_hsync = hsync;
2300 	adj_hbp = hbp;
2301 	adj_hblanking = hblanking;
2302 
2303 	/* HFP needs to be even */
2304 	if (hfp & 0x1) {
2305 		adj_hfp += 1;
2306 		adj_hblanking += 1;
2307 	}
2308 
2309 	/* HBP needs to be even */
2310 	if (hbp & 0x1) {
2311 		adj_hbp -= 1;
2312 		adj_hblanking -= 1;
2313 	}
2314 
2315 	/* HSYNC needs to be even */
2316 	if (hsync & 0x1) {
2317 		if (adj_hblanking < hblanking)
2318 			adj_hsync += 1;
2319 		else
2320 			adj_hsync -= 1;
2321 	}
2322 
2323 	/*
2324 	 * Once illegal timing detected, use default HFP, HSYNC, HBP
2325 	 * This adjusting made for built-in eDP panel, for the externel
2326 	 * DP monitor, may need return false.
2327 	 */
2328 	if (hblanking < HBLANKING_MIN || (hfp < HP_MIN && hbp < HP_MIN)) {
2329 		adj_hsync = SYNC_LEN_DEF;
2330 		adj_hfp = HFP_HBP_DEF;
2331 		adj_hbp = HFP_HBP_DEF;
2332 		vref = adj->clock * 1000 / (adj->htotal * adj->vtotal);
2333 		if (hblanking < HBLANKING_MIN) {
2334 			delta_adj = HBLANKING_MIN - hblanking;
2335 			adj_clock = vref * delta_adj * adj->vtotal;
2336 			adj->clock += DIV_ROUND_UP(adj_clock, 1000);
2337 		} else {
2338 			delta_adj = hblanking - HBLANKING_MIN;
2339 			adj_clock = vref * delta_adj * adj->vtotal;
2340 			adj->clock -= DIV_ROUND_UP(adj_clock, 1000);
2341 		}
2342 
2343 		DRM_WARN("illegal hblanking timing, use default.\n");
2344 		DRM_WARN("hfp(%d), hbp(%d), hsync(%d).\n", hfp, hbp, hsync);
2345 	} else if (adj_hfp < HP_MIN) {
2346 		/* Adjust hfp if hfp less than HP_MIN */
2347 		delta_adj = HP_MIN - adj_hfp;
2348 		adj_hfp = HP_MIN;
2349 
2350 		/*
2351 		 * Balance total HBlanking pixel, if HBP does not have enough
2352 		 * space, adjust HSYNC length, otherwise adjust HBP
2353 		 */
2354 		if ((adj_hbp - delta_adj) < HP_MIN)
2355 			/* HBP not enough space */
2356 			adj_hsync -= delta_adj;
2357 		else
2358 			adj_hbp -= delta_adj;
2359 	} else if (adj_hbp < HP_MIN) {
2360 		delta_adj = HP_MIN - adj_hbp;
2361 		adj_hbp = HP_MIN;
2362 
2363 		/*
2364 		 * Balance total HBlanking pixel, if HBP hasn't enough space,
2365 		 * adjust HSYNC length, otherwize adjust HBP
2366 		 */
2367 		if ((adj_hfp - delta_adj) < HP_MIN)
2368 			/* HFP not enough space */
2369 			adj_hsync -= delta_adj;
2370 		else
2371 			adj_hfp -= delta_adj;
2372 	}
2373 
2374 	DRM_DEV_DEBUG_DRIVER(dev, "after mode fixup\n");
2375 	DRM_DEV_DEBUG_DRIVER(dev, "hsync(%d), hfp(%d), hbp(%d), clock(%d)\n",
2376 			     adj_hsync, adj_hfp, adj_hbp, adj->clock);
2377 
2378 	/* Reconstruct timing */
2379 	adj->hsync_start = adj->hdisplay + adj_hfp;
2380 	adj->hsync_end = adj->hsync_start + adj_hsync;
2381 	adj->htotal = adj->hsync_end + adj_hbp;
2382 	DRM_DEV_DEBUG_DRIVER(dev, "hsync_start(%d), hsync_end(%d), htot(%d)\n",
2383 			     adj->hsync_start, adj->hsync_end, adj->htotal);
2384 
2385 	return true;
2386 }
2387 
2388 static int anx7625_bridge_atomic_check(struct drm_bridge *bridge,
2389 				       struct drm_bridge_state *bridge_state,
2390 				       struct drm_crtc_state *crtc_state,
2391 				       struct drm_connector_state *conn_state)
2392 {
2393 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2394 	struct device *dev = &ctx->client->dev;
2395 
2396 	dev_dbg(dev, "drm bridge atomic check\n");
2397 
2398 	anx7625_bridge_mode_fixup(bridge, &crtc_state->mode,
2399 				  &crtc_state->adjusted_mode);
2400 
2401 	return anx7625_connector_atomic_check(ctx, conn_state);
2402 }
2403 
2404 static void anx7625_bridge_atomic_enable(struct drm_bridge *bridge,
2405 					 struct drm_bridge_state *state)
2406 {
2407 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2408 	struct device *dev = &ctx->client->dev;
2409 	struct drm_connector *connector;
2410 
2411 	dev_dbg(dev, "drm atomic enable\n");
2412 
2413 	if (!bridge->encoder) {
2414 		dev_err(dev, "Parent encoder object not found");
2415 		return;
2416 	}
2417 
2418 	connector = drm_atomic_get_new_connector_for_encoder(state->base.state,
2419 							     bridge->encoder);
2420 	if (!connector)
2421 		return;
2422 
2423 	ctx->connector = connector;
2424 
2425 	pm_runtime_get_sync(dev);
2426 	_anx7625_hpd_polling(ctx, 5000 * 100);
2427 
2428 	anx7625_dp_start(ctx);
2429 }
2430 
2431 static void anx7625_bridge_atomic_disable(struct drm_bridge *bridge,
2432 					  struct drm_bridge_state *old)
2433 {
2434 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2435 	struct device *dev = &ctx->client->dev;
2436 
2437 	dev_dbg(dev, "drm atomic disable\n");
2438 
2439 	ctx->connector = NULL;
2440 	anx7625_dp_stop(ctx);
2441 
2442 	pm_runtime_put_sync(dev);
2443 }
2444 
2445 static enum drm_connector_status
2446 anx7625_bridge_detect(struct drm_bridge *bridge)
2447 {
2448 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2449 	struct device *dev = &ctx->client->dev;
2450 
2451 	DRM_DEV_DEBUG_DRIVER(dev, "drm bridge detect\n");
2452 
2453 	return anx7625_sink_detect(ctx);
2454 }
2455 
2456 static struct edid *anx7625_bridge_get_edid(struct drm_bridge *bridge,
2457 					    struct drm_connector *connector)
2458 {
2459 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2460 	struct device *dev = &ctx->client->dev;
2461 
2462 	DRM_DEV_DEBUG_DRIVER(dev, "drm bridge get edid\n");
2463 
2464 	return anx7625_get_edid(ctx);
2465 }
2466 
2467 static const struct drm_bridge_funcs anx7625_bridge_funcs = {
2468 	.attach = anx7625_bridge_attach,
2469 	.detach = anx7625_bridge_detach,
2470 	.mode_valid = anx7625_bridge_mode_valid,
2471 	.mode_set = anx7625_bridge_mode_set,
2472 	.atomic_check = anx7625_bridge_atomic_check,
2473 	.atomic_enable = anx7625_bridge_atomic_enable,
2474 	.atomic_disable = anx7625_bridge_atomic_disable,
2475 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
2476 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
2477 	.atomic_reset = drm_atomic_helper_bridge_reset,
2478 	.detect = anx7625_bridge_detect,
2479 	.get_edid = anx7625_bridge_get_edid,
2480 };
2481 
2482 static int anx7625_register_i2c_dummy_clients(struct anx7625_data *ctx,
2483 					      struct i2c_client *client)
2484 {
2485 	struct device *dev = &ctx->client->dev;
2486 
2487 	ctx->i2c.tx_p0_client = devm_i2c_new_dummy_device(dev, client->adapter,
2488 							  TX_P0_ADDR >> 1);
2489 	if (IS_ERR(ctx->i2c.tx_p0_client))
2490 		return PTR_ERR(ctx->i2c.tx_p0_client);
2491 
2492 	ctx->i2c.tx_p1_client = devm_i2c_new_dummy_device(dev, client->adapter,
2493 							  TX_P1_ADDR >> 1);
2494 	if (IS_ERR(ctx->i2c.tx_p1_client))
2495 		return PTR_ERR(ctx->i2c.tx_p1_client);
2496 
2497 	ctx->i2c.tx_p2_client = devm_i2c_new_dummy_device(dev, client->adapter,
2498 							  TX_P2_ADDR >> 1);
2499 	if (IS_ERR(ctx->i2c.tx_p2_client))
2500 		return PTR_ERR(ctx->i2c.tx_p2_client);
2501 
2502 	ctx->i2c.rx_p0_client = devm_i2c_new_dummy_device(dev, client->adapter,
2503 							  RX_P0_ADDR >> 1);
2504 	if (IS_ERR(ctx->i2c.rx_p0_client))
2505 		return PTR_ERR(ctx->i2c.rx_p0_client);
2506 
2507 	ctx->i2c.rx_p1_client = devm_i2c_new_dummy_device(dev, client->adapter,
2508 							  RX_P1_ADDR >> 1);
2509 	if (IS_ERR(ctx->i2c.rx_p1_client))
2510 		return PTR_ERR(ctx->i2c.rx_p1_client);
2511 
2512 	ctx->i2c.rx_p2_client = devm_i2c_new_dummy_device(dev, client->adapter,
2513 							  RX_P2_ADDR >> 1);
2514 	if (IS_ERR(ctx->i2c.rx_p2_client))
2515 		return PTR_ERR(ctx->i2c.rx_p2_client);
2516 
2517 	ctx->i2c.tcpc_client = devm_i2c_new_dummy_device(dev, client->adapter,
2518 							 TCPC_INTERFACE_ADDR >> 1);
2519 	if (IS_ERR(ctx->i2c.tcpc_client))
2520 		return PTR_ERR(ctx->i2c.tcpc_client);
2521 
2522 	return 0;
2523 }
2524 
2525 static int __maybe_unused anx7625_runtime_pm_suspend(struct device *dev)
2526 {
2527 	struct anx7625_data *ctx = dev_get_drvdata(dev);
2528 
2529 	mutex_lock(&ctx->lock);
2530 
2531 	anx7625_stop_dp_work(ctx);
2532 	anx7625_power_standby(ctx);
2533 
2534 	mutex_unlock(&ctx->lock);
2535 
2536 	return 0;
2537 }
2538 
2539 static int __maybe_unused anx7625_runtime_pm_resume(struct device *dev)
2540 {
2541 	struct anx7625_data *ctx = dev_get_drvdata(dev);
2542 
2543 	mutex_lock(&ctx->lock);
2544 
2545 	anx7625_power_on_init(ctx);
2546 
2547 	mutex_unlock(&ctx->lock);
2548 
2549 	return 0;
2550 }
2551 
2552 static const struct dev_pm_ops anx7625_pm_ops = {
2553 	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2554 				pm_runtime_force_resume)
2555 	SET_RUNTIME_PM_OPS(anx7625_runtime_pm_suspend,
2556 			   anx7625_runtime_pm_resume, NULL)
2557 };
2558 
2559 static void anx7625_runtime_disable(void *data)
2560 {
2561 	pm_runtime_dont_use_autosuspend(data);
2562 	pm_runtime_disable(data);
2563 }
2564 
2565 static int anx7625_i2c_probe(struct i2c_client *client,
2566 			     const struct i2c_device_id *id)
2567 {
2568 	struct anx7625_data *platform;
2569 	struct anx7625_platform_data *pdata;
2570 	int ret = 0;
2571 	struct device *dev = &client->dev;
2572 
2573 	if (!i2c_check_functionality(client->adapter,
2574 				     I2C_FUNC_SMBUS_I2C_BLOCK)) {
2575 		DRM_DEV_ERROR(dev, "anx7625's i2c bus doesn't support\n");
2576 		return -ENODEV;
2577 	}
2578 
2579 	platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);
2580 	if (!platform) {
2581 		DRM_DEV_ERROR(dev, "fail to allocate driver data\n");
2582 		return -ENOMEM;
2583 	}
2584 
2585 	pdata = &platform->pdata;
2586 
2587 	platform->client = client;
2588 	i2c_set_clientdata(client, platform);
2589 
2590 	pdata->supplies[0].supply = "vdd10";
2591 	pdata->supplies[1].supply = "vdd18";
2592 	pdata->supplies[2].supply = "vdd33";
2593 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pdata->supplies),
2594 				      pdata->supplies);
2595 	if (ret) {
2596 		DRM_DEV_ERROR(dev, "fail to get power supplies: %d\n", ret);
2597 		return ret;
2598 	}
2599 	anx7625_init_gpio(platform);
2600 
2601 	mutex_init(&platform->lock);
2602 	mutex_init(&platform->hdcp_wq_lock);
2603 
2604 	INIT_DELAYED_WORK(&platform->hdcp_work, hdcp_check_work_func);
2605 	platform->hdcp_workqueue = create_workqueue("hdcp workqueue");
2606 	if (!platform->hdcp_workqueue) {
2607 		dev_err(dev, "fail to create work queue\n");
2608 		ret = -ENOMEM;
2609 		return ret;
2610 	}
2611 
2612 	platform->pdata.intp_irq = client->irq;
2613 	if (platform->pdata.intp_irq) {
2614 		INIT_WORK(&platform->work, anx7625_work_func);
2615 		platform->workqueue = alloc_workqueue("anx7625_work",
2616 						      WQ_FREEZABLE | WQ_MEM_RECLAIM, 1);
2617 		if (!platform->workqueue) {
2618 			DRM_DEV_ERROR(dev, "fail to create work queue\n");
2619 			ret = -ENOMEM;
2620 			goto free_hdcp_wq;
2621 		}
2622 
2623 		ret = devm_request_threaded_irq(dev, platform->pdata.intp_irq,
2624 						NULL, anx7625_intr_hpd_isr,
2625 						IRQF_TRIGGER_FALLING |
2626 						IRQF_ONESHOT,
2627 						"anx7625-intp", platform);
2628 		if (ret) {
2629 			DRM_DEV_ERROR(dev, "fail to request irq\n");
2630 			goto free_wq;
2631 		}
2632 	}
2633 
2634 	platform->aux.name = "anx7625-aux";
2635 	platform->aux.dev = dev;
2636 	platform->aux.transfer = anx7625_aux_transfer;
2637 	platform->aux.wait_hpd_asserted = anx7625_wait_hpd_asserted;
2638 	drm_dp_aux_init(&platform->aux);
2639 
2640 	if (anx7625_register_i2c_dummy_clients(platform, client) != 0) {
2641 		ret = -ENOMEM;
2642 		DRM_DEV_ERROR(dev, "fail to reserve I2C bus.\n");
2643 		goto free_wq;
2644 	}
2645 
2646 	pm_runtime_enable(dev);
2647 	pm_runtime_set_autosuspend_delay(dev, 1000);
2648 	pm_runtime_use_autosuspend(dev);
2649 	pm_suspend_ignore_children(dev, true);
2650 	ret = devm_add_action_or_reset(dev, anx7625_runtime_disable, dev);
2651 	if (ret)
2652 		goto free_wq;
2653 
2654 	devm_of_dp_aux_populate_ep_devices(&platform->aux);
2655 
2656 	ret = anx7625_parse_dt(dev, pdata);
2657 	if (ret) {
2658 		if (ret != -EPROBE_DEFER)
2659 			DRM_DEV_ERROR(dev, "fail to parse DT : %d\n", ret);
2660 		goto free_wq;
2661 	}
2662 
2663 	if (!platform->pdata.low_power_mode) {
2664 		anx7625_disable_pd_protocol(platform);
2665 		pm_runtime_get_sync(dev);
2666 		_anx7625_hpd_polling(platform, 5000 * 100);
2667 	}
2668 
2669 	/* Add work function */
2670 	if (platform->pdata.intp_irq)
2671 		queue_work(platform->workqueue, &platform->work);
2672 
2673 	platform->bridge.funcs = &anx7625_bridge_funcs;
2674 	platform->bridge.of_node = client->dev.of_node;
2675 	if (!anx7625_of_panel_on_aux_bus(&client->dev))
2676 		platform->bridge.ops |= DRM_BRIDGE_OP_EDID;
2677 	if (!platform->pdata.panel_bridge)
2678 		platform->bridge.ops |= DRM_BRIDGE_OP_HPD |
2679 					DRM_BRIDGE_OP_DETECT;
2680 	platform->bridge.type = platform->pdata.panel_bridge ?
2681 				    DRM_MODE_CONNECTOR_eDP :
2682 				    DRM_MODE_CONNECTOR_DisplayPort;
2683 
2684 	drm_bridge_add(&platform->bridge);
2685 
2686 	if (!platform->pdata.is_dpi) {
2687 		ret = anx7625_attach_dsi(platform);
2688 		if (ret) {
2689 			DRM_DEV_ERROR(dev, "Fail to attach to dsi : %d\n", ret);
2690 			goto unregister_bridge;
2691 		}
2692 	}
2693 
2694 	if (platform->pdata.audio_en)
2695 		anx7625_register_audio(dev, platform);
2696 
2697 	DRM_DEV_DEBUG_DRIVER(dev, "probe done\n");
2698 
2699 	return 0;
2700 
2701 unregister_bridge:
2702 	drm_bridge_remove(&platform->bridge);
2703 
2704 	if (!platform->pdata.low_power_mode)
2705 		pm_runtime_put_sync_suspend(&client->dev);
2706 
2707 free_wq:
2708 	if (platform->workqueue)
2709 		destroy_workqueue(platform->workqueue);
2710 
2711 free_hdcp_wq:
2712 	if (platform->hdcp_workqueue)
2713 		destroy_workqueue(platform->hdcp_workqueue);
2714 
2715 	return ret;
2716 }
2717 
2718 static void anx7625_i2c_remove(struct i2c_client *client)
2719 {
2720 	struct anx7625_data *platform = i2c_get_clientdata(client);
2721 
2722 	drm_bridge_remove(&platform->bridge);
2723 
2724 	if (platform->pdata.intp_irq)
2725 		destroy_workqueue(platform->workqueue);
2726 
2727 	if (platform->hdcp_workqueue) {
2728 		cancel_delayed_work(&platform->hdcp_work);
2729 		flush_workqueue(platform->hdcp_workqueue);
2730 		destroy_workqueue(platform->hdcp_workqueue);
2731 	}
2732 
2733 	if (!platform->pdata.low_power_mode)
2734 		pm_runtime_put_sync_suspend(&client->dev);
2735 
2736 	if (platform->pdata.audio_en)
2737 		anx7625_unregister_audio(platform);
2738 }
2739 
2740 static const struct i2c_device_id anx7625_id[] = {
2741 	{"anx7625", 0},
2742 	{}
2743 };
2744 
2745 MODULE_DEVICE_TABLE(i2c, anx7625_id);
2746 
2747 static const struct of_device_id anx_match_table[] = {
2748 	{.compatible = "analogix,anx7625",},
2749 	{},
2750 };
2751 MODULE_DEVICE_TABLE(of, anx_match_table);
2752 
2753 static struct i2c_driver anx7625_driver = {
2754 	.driver = {
2755 		.name = "anx7625",
2756 		.of_match_table = anx_match_table,
2757 		.pm = &anx7625_pm_ops,
2758 	},
2759 	.probe = anx7625_i2c_probe,
2760 	.remove = anx7625_i2c_remove,
2761 
2762 	.id_table = anx7625_id,
2763 };
2764 
2765 module_i2c_driver(anx7625_driver);
2766 
2767 MODULE_DESCRIPTION("MIPI2DP anx7625 driver");
2768 MODULE_AUTHOR("Xin Ji <xji@analogixsemi.com>");
2769 MODULE_LICENSE("GPL v2");
2770 MODULE_VERSION(ANX7625_DRV_VERSION);
2771