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_graph.h>
21 #include <linux/of_platform.h>
22 
23 #include <drm/display/drm_dp_aux_bus.h>
24 #include <drm/display/drm_dp_helper.h>
25 #include <drm/display/drm_hdcp_helper.h>
26 #include <drm/drm_atomic_helper.h>
27 #include <drm/drm_bridge.h>
28 #include <drm/drm_edid.h>
29 #include <drm/drm_mipi_dsi.h>
30 #include <drm/drm_of.h>
31 #include <drm/drm_panel.h>
32 #include <drm/drm_print.h>
33 #include <drm/drm_probe_helper.h>
34 
35 #include <media/v4l2-fwnode.h>
36 #include <sound/hdmi-codec.h>
37 #include <video/display_timing.h>
38 
39 #include "anx7625.h"
40 
41 /*
42  * There is a sync issue while access I2C register between AP(CPU) and
43  * internal firmware(OCM), to avoid the race condition, AP should access
44  * the reserved slave address before slave address occurs changes.
45  */
46 static int i2c_access_workaround(struct anx7625_data *ctx,
47 				 struct i2c_client *client)
48 {
49 	u8 offset;
50 	struct device *dev = &client->dev;
51 	int ret;
52 
53 	if (client == ctx->last_client)
54 		return 0;
55 
56 	ctx->last_client = client;
57 
58 	if (client == ctx->i2c.tcpc_client)
59 		offset = RSVD_00_ADDR;
60 	else if (client == ctx->i2c.tx_p0_client)
61 		offset = RSVD_D1_ADDR;
62 	else if (client == ctx->i2c.tx_p1_client)
63 		offset = RSVD_60_ADDR;
64 	else if (client == ctx->i2c.rx_p0_client)
65 		offset = RSVD_39_ADDR;
66 	else if (client == ctx->i2c.rx_p1_client)
67 		offset = RSVD_7F_ADDR;
68 	else
69 		offset = RSVD_00_ADDR;
70 
71 	ret = i2c_smbus_write_byte_data(client, offset, 0x00);
72 	if (ret < 0)
73 		DRM_DEV_ERROR(dev,
74 			      "fail to access i2c id=%x\n:%x",
75 			      client->addr, offset);
76 
77 	return ret;
78 }
79 
80 static int anx7625_reg_read(struct anx7625_data *ctx,
81 			    struct i2c_client *client, u8 reg_addr)
82 {
83 	int ret;
84 	struct device *dev = &client->dev;
85 
86 	i2c_access_workaround(ctx, client);
87 
88 	ret = i2c_smbus_read_byte_data(client, reg_addr);
89 	if (ret < 0)
90 		DRM_DEV_ERROR(dev, "read i2c fail id=%x:%x\n",
91 			      client->addr, reg_addr);
92 
93 	return ret;
94 }
95 
96 static int anx7625_reg_block_read(struct anx7625_data *ctx,
97 				  struct i2c_client *client,
98 				  u8 reg_addr, u8 len, u8 *buf)
99 {
100 	int ret;
101 	struct device *dev = &client->dev;
102 
103 	i2c_access_workaround(ctx, client);
104 
105 	ret = i2c_smbus_read_i2c_block_data(client, reg_addr, len, buf);
106 	if (ret < 0)
107 		DRM_DEV_ERROR(dev, "read i2c block fail id=%x:%x\n",
108 			      client->addr, reg_addr);
109 
110 	return ret;
111 }
112 
113 static int anx7625_reg_write(struct anx7625_data *ctx,
114 			     struct i2c_client *client,
115 			     u8 reg_addr, u8 reg_val)
116 {
117 	int ret;
118 	struct device *dev = &client->dev;
119 
120 	i2c_access_workaround(ctx, client);
121 
122 	ret = i2c_smbus_write_byte_data(client, reg_addr, reg_val);
123 
124 	if (ret < 0)
125 		DRM_DEV_ERROR(dev, "fail to write i2c id=%x\n:%x",
126 			      client->addr, reg_addr);
127 
128 	return ret;
129 }
130 
131 static int anx7625_reg_block_write(struct anx7625_data *ctx,
132 				   struct i2c_client *client,
133 				   u8 reg_addr, u8 len, u8 *buf)
134 {
135 	int ret;
136 	struct device *dev = &client->dev;
137 
138 	i2c_access_workaround(ctx, client);
139 
140 	ret = i2c_smbus_write_i2c_block_data(client, reg_addr, len, buf);
141 	if (ret < 0)
142 		dev_err(dev, "write i2c block failed id=%x\n:%x",
143 			client->addr, reg_addr);
144 
145 	return ret;
146 }
147 
148 static int anx7625_write_or(struct anx7625_data *ctx,
149 			    struct i2c_client *client,
150 			    u8 offset, u8 mask)
151 {
152 	int val;
153 
154 	val = anx7625_reg_read(ctx, client, offset);
155 	if (val < 0)
156 		return val;
157 
158 	return anx7625_reg_write(ctx, client, offset, (val | (mask)));
159 }
160 
161 static int anx7625_write_and(struct anx7625_data *ctx,
162 			     struct i2c_client *client,
163 			     u8 offset, u8 mask)
164 {
165 	int val;
166 
167 	val = anx7625_reg_read(ctx, client, offset);
168 	if (val < 0)
169 		return val;
170 
171 	return anx7625_reg_write(ctx, client, offset, (val & (mask)));
172 }
173 
174 static int anx7625_write_and_or(struct anx7625_data *ctx,
175 				struct i2c_client *client,
176 				u8 offset, u8 and_mask, u8 or_mask)
177 {
178 	int val;
179 
180 	val = anx7625_reg_read(ctx, client, offset);
181 	if (val < 0)
182 		return val;
183 
184 	return anx7625_reg_write(ctx, client,
185 				 offset, (val & and_mask) | (or_mask));
186 }
187 
188 static int anx7625_config_bit_matrix(struct anx7625_data *ctx)
189 {
190 	int i, ret;
191 
192 	ret = anx7625_write_or(ctx, ctx->i2c.tx_p2_client,
193 			       AUDIO_CONTROL_REGISTER, 0x80);
194 	for (i = 0; i < 13; i++)
195 		ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
196 					 VIDEO_BIT_MATRIX_12 + i,
197 					 0x18 + i);
198 
199 	return ret;
200 }
201 
202 static int anx7625_read_ctrl_status_p0(struct anx7625_data *ctx)
203 {
204 	return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, AP_AUX_CTRL_STATUS);
205 }
206 
207 static int wait_aux_op_finish(struct anx7625_data *ctx)
208 {
209 	struct device *dev = &ctx->client->dev;
210 	int val;
211 	int ret;
212 
213 	ret = readx_poll_timeout(anx7625_read_ctrl_status_p0,
214 				 ctx, val,
215 				 (!(val & AP_AUX_CTRL_OP_EN) || (val < 0)),
216 				 2000,
217 				 2000 * 150);
218 	if (ret) {
219 		DRM_DEV_ERROR(dev, "aux operation fail!\n");
220 		return -EIO;
221 	}
222 
223 	val = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
224 			       AP_AUX_CTRL_STATUS);
225 	if (val < 0 || (val & 0x0F)) {
226 		DRM_DEV_ERROR(dev, "aux status %02x\n", val);
227 		return -EIO;
228 	}
229 
230 	return 0;
231 }
232 
233 static int anx7625_aux_trans(struct anx7625_data *ctx, u8 op, u32 address,
234 			     u8 len, u8 *buf)
235 {
236 	struct device *dev = &ctx->client->dev;
237 	int ret;
238 	u8 addrh, addrm, addrl;
239 	u8 cmd;
240 	bool is_write = !(op & DP_AUX_I2C_READ);
241 
242 	if (len > DP_AUX_MAX_PAYLOAD_BYTES) {
243 		dev_err(dev, "exceed aux buffer len.\n");
244 		return -EINVAL;
245 	}
246 
247 	if (!len)
248 		return len;
249 
250 	addrl = address & 0xFF;
251 	addrm = (address >> 8) & 0xFF;
252 	addrh = (address >> 16) & 0xFF;
253 
254 	if (!is_write)
255 		op &= ~DP_AUX_I2C_MOT;
256 	cmd = DPCD_CMD(len, op);
257 
258 	/* Set command and length */
259 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
260 				AP_AUX_COMMAND, cmd);
261 
262 	/* Set aux access address */
263 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
264 				 AP_AUX_ADDR_7_0, addrl);
265 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
266 				 AP_AUX_ADDR_15_8, addrm);
267 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
268 				 AP_AUX_ADDR_19_16, addrh);
269 
270 	if (is_write)
271 		ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client,
272 					       AP_AUX_BUFF_START, len, buf);
273 	/* Enable aux access */
274 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
275 				AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
276 
277 	if (ret < 0) {
278 		dev_err(dev, "cannot access aux related register.\n");
279 		return -EIO;
280 	}
281 
282 	ret = wait_aux_op_finish(ctx);
283 	if (ret < 0) {
284 		dev_err(dev, "aux IO error: wait aux op finish.\n");
285 		return ret;
286 	}
287 
288 	/* Write done */
289 	if (is_write)
290 		return len;
291 
292 	/* Read done, read out dpcd data */
293 	ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
294 				     AP_AUX_BUFF_START, len, buf);
295 	if (ret < 0) {
296 		dev_err(dev, "read dpcd register failed\n");
297 		return -EIO;
298 	}
299 
300 	return len;
301 }
302 
303 static int anx7625_video_mute_control(struct anx7625_data *ctx,
304 				      u8 status)
305 {
306 	int ret;
307 
308 	if (status) {
309 		/* Set mute on flag */
310 		ret = anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
311 				       AP_AV_STATUS, AP_MIPI_MUTE);
312 		/* Clear mipi RX en */
313 		ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
314 					 AP_AV_STATUS, (u8)~AP_MIPI_RX_EN);
315 	} else {
316 		/* Mute off flag */
317 		ret = anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
318 					AP_AV_STATUS, (u8)~AP_MIPI_MUTE);
319 		/* Set MIPI RX EN */
320 		ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
321 					AP_AV_STATUS, AP_MIPI_RX_EN);
322 	}
323 
324 	return ret;
325 }
326 
327 /* Reduction of fraction a/b */
328 static void anx7625_reduction_of_a_fraction(unsigned long *a, unsigned long *b)
329 {
330 	unsigned long gcd_num;
331 	unsigned long tmp_a, tmp_b;
332 	u32 i = 1;
333 
334 	gcd_num = gcd(*a, *b);
335 	*a /= gcd_num;
336 	*b /= gcd_num;
337 
338 	tmp_a = *a;
339 	tmp_b = *b;
340 
341 	while ((*a > MAX_UNSIGNED_24BIT) || (*b > MAX_UNSIGNED_24BIT)) {
342 		i++;
343 		*a = tmp_a / i;
344 		*b = tmp_b / i;
345 	}
346 
347 	/*
348 	 * In the end, make a, b larger to have higher ODFC PLL
349 	 * output frequency accuracy
350 	 */
351 	while ((*a < MAX_UNSIGNED_24BIT) && (*b < MAX_UNSIGNED_24BIT)) {
352 		*a <<= 1;
353 		*b <<= 1;
354 	}
355 
356 	*a >>= 1;
357 	*b >>= 1;
358 }
359 
360 static int anx7625_calculate_m_n(u32 pixelclock,
361 				 unsigned long *m,
362 				 unsigned long *n,
363 				 u8 *post_divider)
364 {
365 	if (pixelclock > PLL_OUT_FREQ_ABS_MAX / POST_DIVIDER_MIN) {
366 		/* Pixel clock frequency is too high */
367 		DRM_ERROR("pixelclock too high, act(%d), maximum(%lu)\n",
368 			  pixelclock,
369 			  PLL_OUT_FREQ_ABS_MAX / POST_DIVIDER_MIN);
370 		return -EINVAL;
371 	}
372 
373 	if (pixelclock < PLL_OUT_FREQ_ABS_MIN / POST_DIVIDER_MAX) {
374 		/* Pixel clock frequency is too low */
375 		DRM_ERROR("pixelclock too low, act(%d), maximum(%lu)\n",
376 			  pixelclock,
377 			  PLL_OUT_FREQ_ABS_MIN / POST_DIVIDER_MAX);
378 		return -EINVAL;
379 	}
380 
381 	for (*post_divider = 1;
382 		pixelclock < (PLL_OUT_FREQ_MIN / (*post_divider));)
383 		*post_divider += 1;
384 
385 	if (*post_divider > POST_DIVIDER_MAX) {
386 		for (*post_divider = 1;
387 			(pixelclock <
388 			 (PLL_OUT_FREQ_ABS_MIN / (*post_divider)));)
389 			*post_divider += 1;
390 
391 		if (*post_divider > POST_DIVIDER_MAX) {
392 			DRM_ERROR("cannot find property post_divider(%d)\n",
393 				  *post_divider);
394 			return -EDOM;
395 		}
396 	}
397 
398 	/* Patch to improve the accuracy */
399 	if (*post_divider == 7) {
400 		/* 27,000,000 is not divisible by 7 */
401 		*post_divider = 8;
402 	} else if (*post_divider == 11) {
403 		/* 27,000,000 is not divisible by 11 */
404 		*post_divider = 12;
405 	} else if ((*post_divider == 13) || (*post_divider == 14)) {
406 		/* 27,000,000 is not divisible by 13 or 14 */
407 		*post_divider = 15;
408 	}
409 
410 	if (pixelclock * (*post_divider) > PLL_OUT_FREQ_ABS_MAX) {
411 		DRM_ERROR("act clock(%u) large than maximum(%lu)\n",
412 			  pixelclock * (*post_divider),
413 			  PLL_OUT_FREQ_ABS_MAX);
414 		return -EDOM;
415 	}
416 
417 	*m = pixelclock;
418 	*n = XTAL_FRQ / (*post_divider);
419 
420 	anx7625_reduction_of_a_fraction(m, n);
421 
422 	return 0;
423 }
424 
425 static int anx7625_odfc_config(struct anx7625_data *ctx,
426 			       u8 post_divider)
427 {
428 	int ret;
429 	struct device *dev = &ctx->client->dev;
430 
431 	/* Config input reference clock frequency 27MHz/19.2MHz */
432 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_16,
433 				~(REF_CLK_27000KHZ << MIPI_FREF_D_IND));
434 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_16,
435 				(REF_CLK_27000KHZ << MIPI_FREF_D_IND));
436 	/* Post divider */
437 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client,
438 				 MIPI_DIGITAL_PLL_8, 0x0f);
439 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_8,
440 				post_divider << 4);
441 
442 	/* Add patch for MIS2-125 (5pcs ANX7625 fail ATE MBIST test) */
443 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_7,
444 				 ~MIPI_PLL_VCO_TUNE_REG_VAL);
445 
446 	/* Reset ODFC PLL */
447 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_7,
448 				 ~MIPI_PLL_RESET_N);
449 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_7,
450 				MIPI_PLL_RESET_N);
451 
452 	if (ret < 0)
453 		DRM_DEV_ERROR(dev, "IO error.\n");
454 
455 	return ret;
456 }
457 
458 /*
459  * The MIPI source video data exist large variation (e.g. 59Hz ~ 61Hz),
460  * anx7625 defined K ratio for matching MIPI input video clock and
461  * DP output video clock. Increase K value can match bigger video data
462  * variation. IVO panel has small variation than DP CTS spec, need
463  * decrease the K value.
464  */
465 static int anx7625_set_k_value(struct anx7625_data *ctx)
466 {
467 	struct edid *edid = (struct edid *)ctx->slimport_edid_p.edid_raw_data;
468 
469 	if (edid->mfg_id[0] == IVO_MID0 && edid->mfg_id[1] == IVO_MID1)
470 		return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
471 					 MIPI_DIGITAL_ADJ_1, 0x3B);
472 
473 	return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
474 				 MIPI_DIGITAL_ADJ_1, 0x3D);
475 }
476 
477 static int anx7625_dsi_video_timing_config(struct anx7625_data *ctx)
478 {
479 	struct device *dev = &ctx->client->dev;
480 	unsigned long m, n;
481 	u16 htotal;
482 	int ret;
483 	u8 post_divider = 0;
484 
485 	ret = anx7625_calculate_m_n(ctx->dt.pixelclock.min * 1000,
486 				    &m, &n, &post_divider);
487 
488 	if (ret) {
489 		DRM_DEV_ERROR(dev, "cannot get property m n value.\n");
490 		return ret;
491 	}
492 
493 	DRM_DEV_DEBUG_DRIVER(dev, "compute M(%lu), N(%lu), divider(%d).\n",
494 			     m, n, post_divider);
495 
496 	/* Configure pixel clock */
497 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, PIXEL_CLOCK_L,
498 				(ctx->dt.pixelclock.min / 1000) & 0xFF);
499 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, PIXEL_CLOCK_H,
500 				 (ctx->dt.pixelclock.min / 1000) >> 8);
501 	/* Lane count */
502 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client,
503 			MIPI_LANE_CTRL_0, 0xfc);
504 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client,
505 				MIPI_LANE_CTRL_0, ctx->pdata.mipi_lanes - 1);
506 
507 	/* Htotal */
508 	htotal = ctx->dt.hactive.min + ctx->dt.hfront_porch.min +
509 		ctx->dt.hback_porch.min + ctx->dt.hsync_len.min;
510 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
511 			HORIZONTAL_TOTAL_PIXELS_L, htotal & 0xFF);
512 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
513 			HORIZONTAL_TOTAL_PIXELS_H, htotal >> 8);
514 	/* Hactive */
515 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
516 			HORIZONTAL_ACTIVE_PIXELS_L, ctx->dt.hactive.min & 0xFF);
517 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
518 			HORIZONTAL_ACTIVE_PIXELS_H, ctx->dt.hactive.min >> 8);
519 	/* HFP */
520 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
521 			HORIZONTAL_FRONT_PORCH_L, ctx->dt.hfront_porch.min);
522 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
523 			HORIZONTAL_FRONT_PORCH_H,
524 			ctx->dt.hfront_porch.min >> 8);
525 	/* HWS */
526 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
527 			HORIZONTAL_SYNC_WIDTH_L, ctx->dt.hsync_len.min);
528 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
529 			HORIZONTAL_SYNC_WIDTH_H, ctx->dt.hsync_len.min >> 8);
530 	/* HBP */
531 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
532 			HORIZONTAL_BACK_PORCH_L, ctx->dt.hback_porch.min);
533 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
534 			HORIZONTAL_BACK_PORCH_H, ctx->dt.hback_porch.min >> 8);
535 	/* Vactive */
536 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client, ACTIVE_LINES_L,
537 			ctx->dt.vactive.min);
538 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client, ACTIVE_LINES_H,
539 			ctx->dt.vactive.min >> 8);
540 	/* VFP */
541 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
542 			VERTICAL_FRONT_PORCH, ctx->dt.vfront_porch.min);
543 	/* VWS */
544 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
545 			VERTICAL_SYNC_WIDTH, ctx->dt.vsync_len.min);
546 	/* VBP */
547 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p2_client,
548 			VERTICAL_BACK_PORCH, ctx->dt.vback_porch.min);
549 	/* M value */
550 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
551 			MIPI_PLL_M_NUM_23_16, (m >> 16) & 0xff);
552 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
553 			MIPI_PLL_M_NUM_15_8, (m >> 8) & 0xff);
554 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
555 			MIPI_PLL_M_NUM_7_0, (m & 0xff));
556 	/* N value */
557 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
558 			MIPI_PLL_N_NUM_23_16, (n >> 16) & 0xff);
559 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
560 			MIPI_PLL_N_NUM_15_8, (n >> 8) & 0xff);
561 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, MIPI_PLL_N_NUM_7_0,
562 			(n & 0xff));
563 
564 	anx7625_set_k_value(ctx);
565 
566 	ret |= anx7625_odfc_config(ctx, post_divider - 1);
567 
568 	if (ret < 0)
569 		DRM_DEV_ERROR(dev, "mipi dsi setup IO error.\n");
570 
571 	return ret;
572 }
573 
574 static int anx7625_swap_dsi_lane3(struct anx7625_data *ctx)
575 {
576 	int val;
577 	struct device *dev = &ctx->client->dev;
578 
579 	/* Swap MIPI-DSI data lane 3 P and N */
580 	val = anx7625_reg_read(ctx, ctx->i2c.rx_p1_client, MIPI_SWAP);
581 	if (val < 0) {
582 		DRM_DEV_ERROR(dev, "IO error : access MIPI_SWAP.\n");
583 		return -EIO;
584 	}
585 
586 	val |= (1 << MIPI_SWAP_CH3);
587 	return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, MIPI_SWAP, val);
588 }
589 
590 static int anx7625_api_dsi_config(struct anx7625_data *ctx)
591 
592 {
593 	int val, ret;
594 	struct device *dev = &ctx->client->dev;
595 
596 	/* Swap MIPI-DSI data lane 3 P and N */
597 	ret = anx7625_swap_dsi_lane3(ctx);
598 	if (ret < 0) {
599 		DRM_DEV_ERROR(dev, "IO error : swap dsi lane 3 fail.\n");
600 		return ret;
601 	}
602 
603 	/* DSI clock settings */
604 	val = (0 << MIPI_HS_PWD_CLK)		|
605 		(0 << MIPI_HS_RT_CLK)		|
606 		(0 << MIPI_PD_CLK)		|
607 		(1 << MIPI_CLK_RT_MANUAL_PD_EN)	|
608 		(1 << MIPI_CLK_HS_MANUAL_PD_EN)	|
609 		(0 << MIPI_CLK_DET_DET_BYPASS)	|
610 		(0 << MIPI_CLK_MISS_CTRL)	|
611 		(0 << MIPI_PD_LPTX_CH_MANUAL_PD_EN);
612 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
613 				MIPI_PHY_CONTROL_3, val);
614 
615 	/*
616 	 * Decreased HS prepare timing delay from 160ns to 80ns work with
617 	 *     a) Dragon board 810 series (Qualcomm AP)
618 	 *     b) Moving Pixel DSI source (PG3A pattern generator +
619 	 *	P332 D-PHY Probe) default D-PHY timing
620 	 *	5ns/step
621 	 */
622 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
623 				 MIPI_TIME_HS_PRPR, 0x10);
624 
625 	/* Enable DSI mode*/
626 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_18,
627 				SELECT_DSI << MIPI_DPI_SELECT);
628 
629 	ret |= anx7625_dsi_video_timing_config(ctx);
630 	if (ret < 0) {
631 		DRM_DEV_ERROR(dev, "dsi video timing config fail\n");
632 		return ret;
633 	}
634 
635 	/* Toggle m, n ready */
636 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_6,
637 				~(MIPI_M_NUM_READY | MIPI_N_NUM_READY));
638 	usleep_range(1000, 1100);
639 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, MIPI_DIGITAL_PLL_6,
640 				MIPI_M_NUM_READY | MIPI_N_NUM_READY);
641 
642 	/* Configure integer stable register */
643 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
644 				 MIPI_VIDEO_STABLE_CNT, 0x02);
645 	/* Power on MIPI RX */
646 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
647 				 MIPI_LANE_CTRL_10, 0x00);
648 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
649 				 MIPI_LANE_CTRL_10, 0x80);
650 
651 	if (ret < 0)
652 		DRM_DEV_ERROR(dev, "IO error : mipi dsi enable init fail.\n");
653 
654 	return ret;
655 }
656 
657 static int anx7625_dsi_config(struct anx7625_data *ctx)
658 {
659 	struct device *dev = &ctx->client->dev;
660 	int ret;
661 
662 	DRM_DEV_DEBUG_DRIVER(dev, "config dsi.\n");
663 
664 	/* DSC disable */
665 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
666 				R_DSC_CTRL_0, ~DSC_EN);
667 
668 	ret |= anx7625_api_dsi_config(ctx);
669 
670 	if (ret < 0) {
671 		DRM_DEV_ERROR(dev, "IO error : api dsi config error.\n");
672 		return ret;
673 	}
674 
675 	/* Set MIPI RX EN */
676 	ret = anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
677 			       AP_AV_STATUS, AP_MIPI_RX_EN);
678 	/* Clear mute flag */
679 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
680 				 AP_AV_STATUS, (u8)~AP_MIPI_MUTE);
681 	if (ret < 0)
682 		DRM_DEV_ERROR(dev, "IO error : enable mipi rx fail.\n");
683 	else
684 		DRM_DEV_DEBUG_DRIVER(dev, "success to config DSI\n");
685 
686 	return ret;
687 }
688 
689 static int anx7625_api_dpi_config(struct anx7625_data *ctx)
690 {
691 	struct device *dev = &ctx->client->dev;
692 	u16 freq = ctx->dt.pixelclock.min / 1000;
693 	int ret;
694 
695 	/* configure pixel clock */
696 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
697 				PIXEL_CLOCK_L, freq & 0xFF);
698 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
699 				 PIXEL_CLOCK_H, (freq >> 8));
700 
701 	/* set DPI mode */
702 	/* set to DPI PLL module sel */
703 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
704 				 MIPI_DIGITAL_PLL_9, 0x20);
705 	/* power down MIPI */
706 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
707 				 MIPI_LANE_CTRL_10, 0x08);
708 	/* enable DPI mode */
709 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
710 				 MIPI_DIGITAL_PLL_18, 0x1C);
711 	/* set first edge */
712 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
713 				 VIDEO_CONTROL_0, 0x06);
714 	if (ret < 0)
715 		DRM_DEV_ERROR(dev, "IO error : dpi phy set failed.\n");
716 
717 	return ret;
718 }
719 
720 static int anx7625_dpi_config(struct anx7625_data *ctx)
721 {
722 	struct device *dev = &ctx->client->dev;
723 	int ret;
724 
725 	DRM_DEV_DEBUG_DRIVER(dev, "config dpi\n");
726 
727 	/* DSC disable */
728 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
729 				R_DSC_CTRL_0, ~DSC_EN);
730 	if (ret < 0) {
731 		DRM_DEV_ERROR(dev, "IO error : disable dsc failed.\n");
732 		return ret;
733 	}
734 
735 	ret = anx7625_config_bit_matrix(ctx);
736 	if (ret < 0) {
737 		DRM_DEV_ERROR(dev, "config bit matrix failed.\n");
738 		return ret;
739 	}
740 
741 	ret = anx7625_api_dpi_config(ctx);
742 	if (ret < 0) {
743 		DRM_DEV_ERROR(dev, "mipi phy(dpi) setup failed.\n");
744 		return ret;
745 	}
746 
747 	/* set MIPI RX EN */
748 	ret = anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
749 			       AP_AV_STATUS, AP_MIPI_RX_EN);
750 	/* clear mute flag */
751 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
752 				 AP_AV_STATUS, (u8)~AP_MIPI_MUTE);
753 	if (ret < 0)
754 		DRM_DEV_ERROR(dev, "IO error : enable mipi rx failed.\n");
755 
756 	return ret;
757 }
758 
759 static int anx7625_read_flash_status(struct anx7625_data *ctx)
760 {
761 	return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, R_RAM_CTRL);
762 }
763 
764 static int anx7625_hdcp_key_probe(struct anx7625_data *ctx)
765 {
766 	int ret, val;
767 	struct device *dev = &ctx->client->dev;
768 	u8 ident[FLASH_BUF_LEN];
769 
770 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
771 				FLASH_ADDR_HIGH, 0x91);
772 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
773 				 FLASH_ADDR_LOW, 0xA0);
774 	if (ret < 0) {
775 		dev_err(dev, "IO error : set key flash address.\n");
776 		return ret;
777 	}
778 
779 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
780 				FLASH_LEN_HIGH, (FLASH_BUF_LEN - 1) >> 8);
781 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
782 				 FLASH_LEN_LOW, (FLASH_BUF_LEN - 1) & 0xFF);
783 	if (ret < 0) {
784 		dev_err(dev, "IO error : set key flash len.\n");
785 		return ret;
786 	}
787 
788 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
789 				R_FLASH_RW_CTRL, FLASH_READ);
790 	ret |= readx_poll_timeout(anx7625_read_flash_status,
791 				  ctx, val,
792 				  ((val & FLASH_DONE) || (val < 0)),
793 				  2000,
794 				  2000 * 150);
795 	if (ret) {
796 		dev_err(dev, "flash read access fail!\n");
797 		return -EIO;
798 	}
799 
800 	ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
801 				     FLASH_BUF_BASE_ADDR,
802 				     FLASH_BUF_LEN, ident);
803 	if (ret < 0) {
804 		dev_err(dev, "read flash data fail!\n");
805 		return -EIO;
806 	}
807 
808 	if (ident[29] == 0xFF && ident[30] == 0xFF && ident[31] == 0xFF)
809 		return -EINVAL;
810 
811 	return 0;
812 }
813 
814 static int anx7625_hdcp_key_load(struct anx7625_data *ctx)
815 {
816 	int ret;
817 	struct device *dev = &ctx->client->dev;
818 
819 	/* Select HDCP 1.4 KEY */
820 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
821 				R_BOOT_RETRY, 0x12);
822 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
823 				 FLASH_ADDR_HIGH, HDCP14KEY_START_ADDR >> 8);
824 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
825 				 FLASH_ADDR_LOW, HDCP14KEY_START_ADDR & 0xFF);
826 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
827 				 R_RAM_LEN_H, HDCP14KEY_SIZE >> 12);
828 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
829 				 R_RAM_LEN_L, HDCP14KEY_SIZE >> 4);
830 
831 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
832 				 R_RAM_ADDR_H, 0);
833 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
834 				 R_RAM_ADDR_L, 0);
835 	/* Enable HDCP 1.4 KEY load */
836 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
837 				 R_RAM_CTRL, DECRYPT_EN | LOAD_START);
838 	dev_dbg(dev, "load HDCP 1.4 key done\n");
839 	return ret;
840 }
841 
842 static int anx7625_hdcp_disable(struct anx7625_data *ctx)
843 {
844 	int ret;
845 	struct device *dev = &ctx->client->dev;
846 
847 	dev_dbg(dev, "disable HDCP 1.4\n");
848 
849 	/* Disable HDCP */
850 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);
851 	/* Try auth flag */
852 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
853 	/* Interrupt for DRM */
854 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
855 	if (ret < 0)
856 		dev_err(dev, "fail to disable HDCP\n");
857 
858 	return anx7625_write_and(ctx, ctx->i2c.tx_p0_client,
859 				 TX_HDCP_CTRL0, ~HARD_AUTH_EN & 0xFF);
860 }
861 
862 static int anx7625_hdcp_enable(struct anx7625_data *ctx)
863 {
864 	u8 bcap;
865 	int ret;
866 	struct device *dev = &ctx->client->dev;
867 
868 	ret = anx7625_hdcp_key_probe(ctx);
869 	if (ret) {
870 		dev_dbg(dev, "no key found, not to do hdcp\n");
871 		return ret;
872 	}
873 
874 	/* Read downstream capability */
875 	ret = anx7625_aux_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap);
876 	if (ret < 0)
877 		return ret;
878 
879 	if (!(bcap & 0x01)) {
880 		pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap);
881 		return 0;
882 	}
883 
884 	dev_dbg(dev, "enable HDCP 1.4\n");
885 
886 	/* First clear HDCP state */
887 	ret = anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
888 				TX_HDCP_CTRL0,
889 				KSVLIST_VLD | BKSV_SRM_PASS | RE_AUTHEN);
890 	usleep_range(1000, 1100);
891 	/* Second clear HDCP state */
892 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
893 				 TX_HDCP_CTRL0,
894 				 KSVLIST_VLD | BKSV_SRM_PASS | RE_AUTHEN);
895 
896 	/* Set time for waiting KSVR */
897 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
898 				 SP_TX_WAIT_KSVR_TIME, 0xc8);
899 	/* Set time for waiting R0 */
900 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
901 				 SP_TX_WAIT_R0_TIME, 0xb0);
902 	ret |= anx7625_hdcp_key_load(ctx);
903 	if (ret) {
904 		pr_warn("prepare HDCP key failed.\n");
905 		return ret;
906 	}
907 
908 	ret = anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xee, 0x20);
909 
910 	/* Try auth flag */
911 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
912 	/* Interrupt for DRM */
913 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
914 	if (ret < 0)
915 		dev_err(dev, "fail to enable HDCP\n");
916 
917 	return anx7625_write_or(ctx, ctx->i2c.tx_p0_client,
918 				TX_HDCP_CTRL0, HARD_AUTH_EN);
919 }
920 
921 static void anx7625_dp_start(struct anx7625_data *ctx)
922 {
923 	int ret;
924 	struct device *dev = &ctx->client->dev;
925 	u8 data;
926 
927 	if (!ctx->display_timing_valid) {
928 		DRM_DEV_ERROR(dev, "mipi not set display timing yet.\n");
929 		return;
930 	}
931 
932 	dev_dbg(dev, "set downstream sink into normal\n");
933 	/* Downstream sink enter into normal mode */
934 	data = 1;
935 	ret = anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
936 	if (ret < 0)
937 		dev_err(dev, "IO error : set sink into normal mode fail\n");
938 
939 	/* Disable HDCP */
940 	anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);
941 
942 	if (ctx->pdata.is_dpi)
943 		ret = anx7625_dpi_config(ctx);
944 	else
945 		ret = anx7625_dsi_config(ctx);
946 
947 	if (ret < 0)
948 		DRM_DEV_ERROR(dev, "MIPI phy setup error.\n");
949 
950 	ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
951 
952 	ctx->dp_en = 1;
953 }
954 
955 static void anx7625_dp_stop(struct anx7625_data *ctx)
956 {
957 	struct device *dev = &ctx->client->dev;
958 	int ret;
959 	u8 data;
960 
961 	DRM_DEV_DEBUG_DRIVER(dev, "stop dp output\n");
962 
963 	/*
964 	 * Video disable: 0x72:08 bit 7 = 0;
965 	 * Audio disable: 0x70:87 bit 0 = 0;
966 	 */
967 	ret = anx7625_write_and(ctx, ctx->i2c.tx_p0_client, 0x87, 0xfe);
968 	ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client, 0x08, 0x7f);
969 
970 	ret |= anx7625_video_mute_control(ctx, 1);
971 
972 	dev_dbg(dev, "notify downstream enter into standby\n");
973 	/* Downstream monitor enter into standby mode */
974 	data = 2;
975 	ret |= anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
976 	if (ret < 0)
977 		DRM_DEV_ERROR(dev, "IO error : mute video fail\n");
978 
979 	ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
980 
981 	ctx->dp_en = 0;
982 }
983 
984 static int sp_tx_rst_aux(struct anx7625_data *ctx)
985 {
986 	int ret;
987 
988 	ret = anx7625_write_or(ctx, ctx->i2c.tx_p2_client, RST_CTRL2,
989 			       AUX_RST);
990 	ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client, RST_CTRL2,
991 				 ~AUX_RST);
992 	return ret;
993 }
994 
995 static int sp_tx_aux_wr(struct anx7625_data *ctx, u8 offset)
996 {
997 	int ret;
998 
999 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1000 				AP_AUX_BUFF_START, offset);
1001 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1002 				 AP_AUX_COMMAND, 0x04);
1003 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
1004 				AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
1005 	return (ret | wait_aux_op_finish(ctx));
1006 }
1007 
1008 static int sp_tx_aux_rd(struct anx7625_data *ctx, u8 len_cmd)
1009 {
1010 	int ret;
1011 
1012 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1013 				AP_AUX_COMMAND, len_cmd);
1014 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
1015 				AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
1016 	return (ret | wait_aux_op_finish(ctx));
1017 }
1018 
1019 static int sp_tx_get_edid_block(struct anx7625_data *ctx)
1020 {
1021 	int c = 0;
1022 	struct device *dev = &ctx->client->dev;
1023 
1024 	sp_tx_aux_wr(ctx, 0x7e);
1025 	sp_tx_aux_rd(ctx, 0x01);
1026 	c = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, AP_AUX_BUFF_START);
1027 	if (c < 0) {
1028 		DRM_DEV_ERROR(dev, "IO error : access AUX BUFF.\n");
1029 		return -EIO;
1030 	}
1031 
1032 	DRM_DEV_DEBUG_DRIVER(dev, " EDID Block = %d\n", c + 1);
1033 
1034 	if (c > MAX_EDID_BLOCK)
1035 		c = 1;
1036 
1037 	return c;
1038 }
1039 
1040 static int edid_read(struct anx7625_data *ctx,
1041 		     u8 offset, u8 *pblock_buf)
1042 {
1043 	int ret, cnt;
1044 	struct device *dev = &ctx->client->dev;
1045 
1046 	for (cnt = 0; cnt <= EDID_TRY_CNT; cnt++) {
1047 		sp_tx_aux_wr(ctx, offset);
1048 		/* Set I2C read com 0x01 mot = 0 and read 16 bytes */
1049 		ret = sp_tx_aux_rd(ctx, 0xf1);
1050 
1051 		if (ret) {
1052 			ret = sp_tx_rst_aux(ctx);
1053 			DRM_DEV_DEBUG_DRIVER(dev, "edid read fail, reset!\n");
1054 		} else {
1055 			ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
1056 						     AP_AUX_BUFF_START,
1057 						     MAX_DPCD_BUFFER_SIZE,
1058 						     pblock_buf);
1059 			if (ret > 0)
1060 				break;
1061 		}
1062 	}
1063 
1064 	if (cnt > EDID_TRY_CNT)
1065 		return -EIO;
1066 
1067 	return ret;
1068 }
1069 
1070 static int segments_edid_read(struct anx7625_data *ctx,
1071 			      u8 segment, u8 *buf, u8 offset)
1072 {
1073 	u8 cnt;
1074 	int ret;
1075 	struct device *dev = &ctx->client->dev;
1076 
1077 	/* Write address only */
1078 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1079 				AP_AUX_ADDR_7_0, 0x30);
1080 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1081 				 AP_AUX_COMMAND, 0x04);
1082 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1083 				 AP_AUX_CTRL_STATUS,
1084 				 AP_AUX_CTRL_ADDRONLY | AP_AUX_CTRL_OP_EN);
1085 
1086 	ret |= wait_aux_op_finish(ctx);
1087 	/* Write segment address */
1088 	ret |= sp_tx_aux_wr(ctx, segment);
1089 	/* Data read */
1090 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1091 				 AP_AUX_ADDR_7_0, 0x50);
1092 	if (ret) {
1093 		DRM_DEV_ERROR(dev, "IO error : aux initial fail.\n");
1094 		return ret;
1095 	}
1096 
1097 	for (cnt = 0; cnt <= EDID_TRY_CNT; cnt++) {
1098 		sp_tx_aux_wr(ctx, offset);
1099 		/* Set I2C read com 0x01 mot = 0 and read 16 bytes */
1100 		ret = sp_tx_aux_rd(ctx, 0xf1);
1101 
1102 		if (ret) {
1103 			ret = sp_tx_rst_aux(ctx);
1104 			DRM_DEV_ERROR(dev, "segment read fail, reset!\n");
1105 		} else {
1106 			ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
1107 						     AP_AUX_BUFF_START,
1108 						     MAX_DPCD_BUFFER_SIZE, buf);
1109 			if (ret > 0)
1110 				break;
1111 		}
1112 	}
1113 
1114 	if (cnt > EDID_TRY_CNT)
1115 		return -EIO;
1116 
1117 	return ret;
1118 }
1119 
1120 static int sp_tx_edid_read(struct anx7625_data *ctx,
1121 			   u8 *pedid_blocks_buf)
1122 {
1123 	u8 offset;
1124 	int edid_pos;
1125 	int count, blocks_num;
1126 	u8 pblock_buf[MAX_DPCD_BUFFER_SIZE];
1127 	u8 i, j;
1128 	int g_edid_break = 0;
1129 	int ret;
1130 	struct device *dev = &ctx->client->dev;
1131 
1132 	/* Address initial */
1133 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1134 				AP_AUX_ADDR_7_0, 0x50);
1135 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1136 				 AP_AUX_ADDR_15_8, 0);
1137 	ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
1138 				 AP_AUX_ADDR_19_16, 0xf0);
1139 	if (ret < 0) {
1140 		DRM_DEV_ERROR(dev, "access aux channel IO error.\n");
1141 		return -EIO;
1142 	}
1143 
1144 	blocks_num = sp_tx_get_edid_block(ctx);
1145 	if (blocks_num < 0)
1146 		return blocks_num;
1147 
1148 	count = 0;
1149 
1150 	do {
1151 		switch (count) {
1152 		case 0:
1153 		case 1:
1154 			for (i = 0; i < 8; i++) {
1155 				offset = (i + count * 8) * MAX_DPCD_BUFFER_SIZE;
1156 				g_edid_break = edid_read(ctx, offset,
1157 							 pblock_buf);
1158 
1159 				if (g_edid_break < 0)
1160 					break;
1161 
1162 				memcpy(&pedid_blocks_buf[offset],
1163 				       pblock_buf,
1164 				       MAX_DPCD_BUFFER_SIZE);
1165 			}
1166 
1167 			break;
1168 		case 2:
1169 			offset = 0x00;
1170 
1171 			for (j = 0; j < 8; j++) {
1172 				edid_pos = (j + count * 8) *
1173 					MAX_DPCD_BUFFER_SIZE;
1174 
1175 				if (g_edid_break == 1)
1176 					break;
1177 
1178 				ret = segments_edid_read(ctx, count / 2,
1179 							 pblock_buf, offset);
1180 				if (ret < 0)
1181 					return ret;
1182 
1183 				memcpy(&pedid_blocks_buf[edid_pos],
1184 				       pblock_buf,
1185 				       MAX_DPCD_BUFFER_SIZE);
1186 				offset = offset + 0x10;
1187 			}
1188 
1189 			break;
1190 		case 3:
1191 			offset = 0x80;
1192 
1193 			for (j = 0; j < 8; j++) {
1194 				edid_pos = (j + count * 8) *
1195 					MAX_DPCD_BUFFER_SIZE;
1196 				if (g_edid_break == 1)
1197 					break;
1198 
1199 				ret = segments_edid_read(ctx, count / 2,
1200 							 pblock_buf, offset);
1201 				if (ret < 0)
1202 					return ret;
1203 
1204 				memcpy(&pedid_blocks_buf[edid_pos],
1205 				       pblock_buf,
1206 				       MAX_DPCD_BUFFER_SIZE);
1207 				offset = offset + 0x10;
1208 			}
1209 
1210 			break;
1211 		default:
1212 			break;
1213 		}
1214 
1215 		count++;
1216 
1217 	} while (blocks_num >= count);
1218 
1219 	/* Check edid data */
1220 	if (!drm_edid_is_valid((struct edid *)pedid_blocks_buf)) {
1221 		DRM_DEV_ERROR(dev, "WARNING! edid check fail!\n");
1222 		return -EINVAL;
1223 	}
1224 
1225 	/* Reset aux channel */
1226 	ret = sp_tx_rst_aux(ctx);
1227 	if (ret < 0) {
1228 		DRM_DEV_ERROR(dev, "Failed to reset aux channel!\n");
1229 		return ret;
1230 	}
1231 
1232 	return (blocks_num + 1);
1233 }
1234 
1235 static void anx7625_power_on(struct anx7625_data *ctx)
1236 {
1237 	struct device *dev = &ctx->client->dev;
1238 	int ret, i;
1239 
1240 	if (!ctx->pdata.low_power_mode) {
1241 		DRM_DEV_DEBUG_DRIVER(dev, "not low power mode!\n");
1242 		return;
1243 	}
1244 
1245 	for (i = 0; i < ARRAY_SIZE(ctx->pdata.supplies); i++) {
1246 		ret = regulator_enable(ctx->pdata.supplies[i].consumer);
1247 		if (ret < 0) {
1248 			DRM_DEV_DEBUG_DRIVER(dev, "cannot enable supply %d: %d\n",
1249 					     i, ret);
1250 			goto reg_err;
1251 		}
1252 		usleep_range(2000, 2100);
1253 	}
1254 
1255 	usleep_range(11000, 12000);
1256 
1257 	/* Power on pin enable */
1258 	gpiod_set_value(ctx->pdata.gpio_p_on, 1);
1259 	usleep_range(10000, 11000);
1260 	/* Power reset pin enable */
1261 	gpiod_set_value(ctx->pdata.gpio_reset, 1);
1262 	usleep_range(10000, 11000);
1263 
1264 	DRM_DEV_DEBUG_DRIVER(dev, "power on !\n");
1265 	return;
1266 reg_err:
1267 	for (--i; i >= 0; i--)
1268 		regulator_disable(ctx->pdata.supplies[i].consumer);
1269 }
1270 
1271 static void anx7625_power_standby(struct anx7625_data *ctx)
1272 {
1273 	struct device *dev = &ctx->client->dev;
1274 	int ret;
1275 
1276 	if (!ctx->pdata.low_power_mode) {
1277 		DRM_DEV_DEBUG_DRIVER(dev, "not low power mode!\n");
1278 		return;
1279 	}
1280 
1281 	gpiod_set_value(ctx->pdata.gpio_reset, 0);
1282 	usleep_range(1000, 1100);
1283 	gpiod_set_value(ctx->pdata.gpio_p_on, 0);
1284 	usleep_range(1000, 1100);
1285 
1286 	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->pdata.supplies),
1287 				     ctx->pdata.supplies);
1288 	if (ret < 0)
1289 		DRM_DEV_DEBUG_DRIVER(dev, "cannot disable supplies %d\n", ret);
1290 
1291 	DRM_DEV_DEBUG_DRIVER(dev, "power down\n");
1292 }
1293 
1294 /* Basic configurations of ANX7625 */
1295 static void anx7625_config(struct anx7625_data *ctx)
1296 {
1297 	anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1298 			  XTAL_FRQ_SEL, XTAL_FRQ_27M);
1299 }
1300 
1301 static void anx7625_disable_pd_protocol(struct anx7625_data *ctx)
1302 {
1303 	struct device *dev = &ctx->client->dev;
1304 	int ret;
1305 
1306 	/* Reset main ocm */
1307 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, 0x88, 0x40);
1308 	/* Disable PD */
1309 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1310 				 AP_AV_STATUS, AP_DISABLE_PD);
1311 	/* Release main ocm */
1312 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, 0x88, 0x00);
1313 
1314 	if (ret < 0)
1315 		DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature fail.\n");
1316 	else
1317 		DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature succeeded.\n");
1318 }
1319 
1320 static int anx7625_ocm_loading_check(struct anx7625_data *ctx)
1321 {
1322 	int ret;
1323 	struct device *dev = &ctx->client->dev;
1324 
1325 	/* Check interface workable */
1326 	ret = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
1327 			       FLASH_LOAD_STA);
1328 	if (ret < 0) {
1329 		DRM_DEV_ERROR(dev, "IO error : access flash load.\n");
1330 		return ret;
1331 	}
1332 	if ((ret & FLASH_LOAD_STA_CHK) != FLASH_LOAD_STA_CHK)
1333 		return -ENODEV;
1334 
1335 	anx7625_disable_pd_protocol(ctx);
1336 
1337 	DRM_DEV_DEBUG_DRIVER(dev, "Firmware ver %02x%02x,",
1338 			     anx7625_reg_read(ctx,
1339 					      ctx->i2c.rx_p0_client,
1340 					      OCM_FW_VERSION),
1341 			     anx7625_reg_read(ctx,
1342 					      ctx->i2c.rx_p0_client,
1343 					      OCM_FW_REVERSION));
1344 	DRM_DEV_DEBUG_DRIVER(dev, "Driver version %s\n",
1345 			     ANX7625_DRV_VERSION);
1346 
1347 	return 0;
1348 }
1349 
1350 static void anx7625_power_on_init(struct anx7625_data *ctx)
1351 {
1352 	int retry_count, i;
1353 
1354 	for (retry_count = 0; retry_count < 3; retry_count++) {
1355 		anx7625_power_on(ctx);
1356 		anx7625_config(ctx);
1357 
1358 		for (i = 0; i < OCM_LOADING_TIME; i++) {
1359 			if (!anx7625_ocm_loading_check(ctx))
1360 				return;
1361 			usleep_range(1000, 1100);
1362 		}
1363 		anx7625_power_standby(ctx);
1364 	}
1365 }
1366 
1367 static void anx7625_init_gpio(struct anx7625_data *platform)
1368 {
1369 	struct device *dev = &platform->client->dev;
1370 
1371 	DRM_DEV_DEBUG_DRIVER(dev, "init gpio\n");
1372 
1373 	/* Gpio for chip power enable */
1374 	platform->pdata.gpio_p_on =
1375 		devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
1376 	if (IS_ERR_OR_NULL(platform->pdata.gpio_p_on)) {
1377 		DRM_DEV_DEBUG_DRIVER(dev, "no enable gpio found\n");
1378 		platform->pdata.gpio_p_on = NULL;
1379 	}
1380 
1381 	/* Gpio for chip reset */
1382 	platform->pdata.gpio_reset =
1383 		devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
1384 	if (IS_ERR_OR_NULL(platform->pdata.gpio_reset)) {
1385 		DRM_DEV_DEBUG_DRIVER(dev, "no reset gpio found\n");
1386 		platform->pdata.gpio_reset = NULL;
1387 	}
1388 
1389 	if (platform->pdata.gpio_p_on && platform->pdata.gpio_reset) {
1390 		platform->pdata.low_power_mode = 1;
1391 		DRM_DEV_DEBUG_DRIVER(dev, "low power mode, pon %d, reset %d.\n",
1392 				     desc_to_gpio(platform->pdata.gpio_p_on),
1393 				     desc_to_gpio(platform->pdata.gpio_reset));
1394 	} else {
1395 		platform->pdata.low_power_mode = 0;
1396 		DRM_DEV_DEBUG_DRIVER(dev, "not low power mode.\n");
1397 	}
1398 }
1399 
1400 static void anx7625_stop_dp_work(struct anx7625_data *ctx)
1401 {
1402 	ctx->hpd_status = 0;
1403 	ctx->hpd_high_cnt = 0;
1404 }
1405 
1406 static void anx7625_start_dp_work(struct anx7625_data *ctx)
1407 {
1408 	int ret;
1409 	struct device *dev = &ctx->client->dev;
1410 
1411 	if (ctx->hpd_high_cnt >= 2) {
1412 		DRM_DEV_DEBUG_DRIVER(dev, "filter useless HPD\n");
1413 		return;
1414 	}
1415 
1416 	ctx->hpd_status = 1;
1417 	ctx->hpd_high_cnt++;
1418 
1419 	/* Not support HDCP */
1420 	ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);
1421 
1422 	/* Try auth flag */
1423 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
1424 	/* Interrupt for DRM */
1425 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
1426 	if (ret < 0) {
1427 		DRM_DEV_ERROR(dev, "fail to setting HDCP/auth\n");
1428 		return;
1429 	}
1430 
1431 	ret = anx7625_reg_read(ctx, ctx->i2c.rx_p1_client, 0x86);
1432 	if (ret < 0)
1433 		return;
1434 
1435 	DRM_DEV_DEBUG_DRIVER(dev, "Secure OCM version=%02x\n", ret);
1436 }
1437 
1438 static int anx7625_read_hpd_status_p0(struct anx7625_data *ctx)
1439 {
1440 	int ret;
1441 
1442 	/* Set irq detect window to 2ms */
1443 	ret = anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
1444 				HPD_DET_TIMER_BIT0_7, HPD_TIME & 0xFF);
1445 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
1446 				 HPD_DET_TIMER_BIT8_15,
1447 				 (HPD_TIME >> 8) & 0xFF);
1448 	ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
1449 				 HPD_DET_TIMER_BIT16_23,
1450 				 (HPD_TIME >> 16) & 0xFF);
1451 	if (ret < 0)
1452 		return ret;
1453 
1454 	return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
1455 }
1456 
1457 static int _anx7625_hpd_polling(struct anx7625_data *ctx,
1458 				unsigned long wait_us)
1459 {
1460 	int ret, val;
1461 	struct device *dev = &ctx->client->dev;
1462 
1463 	/* Interrupt mode, no need poll HPD status, just return */
1464 	if (ctx->pdata.intp_irq)
1465 		return 0;
1466 
1467 	ret = readx_poll_timeout(anx7625_read_hpd_status_p0,
1468 				 ctx, val,
1469 				 ((val & HPD_STATUS) || (val < 0)),
1470 				 wait_us / 100,
1471 				 wait_us);
1472 	if (ret) {
1473 		DRM_DEV_ERROR(dev, "no hpd.\n");
1474 		return ret;
1475 	}
1476 
1477 	DRM_DEV_DEBUG_DRIVER(dev, "system status: 0x%x. HPD raise up.\n", val);
1478 	anx7625_reg_write(ctx, ctx->i2c.tcpc_client,
1479 			  INTR_ALERT_1, 0xFF);
1480 	anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1481 			  INTERFACE_CHANGE_INT, 0);
1482 
1483 	anx7625_start_dp_work(ctx);
1484 
1485 	if (!ctx->pdata.panel_bridge && ctx->bridge_attached)
1486 		drm_helper_hpd_irq_event(ctx->bridge.dev);
1487 
1488 	return 0;
1489 }
1490 
1491 static int anx7625_wait_hpd_asserted(struct drm_dp_aux *aux,
1492 				     unsigned long wait_us)
1493 {
1494 	struct anx7625_data *ctx = container_of(aux, struct anx7625_data, aux);
1495 	struct device *dev = &ctx->client->dev;
1496 	int ret;
1497 
1498 	pm_runtime_get_sync(dev);
1499 	ret = _anx7625_hpd_polling(ctx, wait_us);
1500 	pm_runtime_mark_last_busy(dev);
1501 	pm_runtime_put_autosuspend(dev);
1502 
1503 	return ret;
1504 }
1505 
1506 static void anx7625_remove_edid(struct anx7625_data *ctx)
1507 {
1508 	ctx->slimport_edid_p.edid_block_num = -1;
1509 }
1510 
1511 static void anx7625_dp_adjust_swing(struct anx7625_data *ctx)
1512 {
1513 	int i;
1514 
1515 	for (i = 0; i < ctx->pdata.dp_lane0_swing_reg_cnt; i++)
1516 		anx7625_reg_write(ctx, ctx->i2c.tx_p1_client,
1517 				  DP_TX_LANE0_SWING_REG0 + i,
1518 				  ctx->pdata.lane0_reg_data[i]);
1519 
1520 	for (i = 0; i < ctx->pdata.dp_lane1_swing_reg_cnt; i++)
1521 		anx7625_reg_write(ctx, ctx->i2c.tx_p1_client,
1522 				  DP_TX_LANE1_SWING_REG0 + i,
1523 				  ctx->pdata.lane1_reg_data[i]);
1524 }
1525 
1526 static void dp_hpd_change_handler(struct anx7625_data *ctx, bool on)
1527 {
1528 	struct device *dev = &ctx->client->dev;
1529 
1530 	/* HPD changed */
1531 	DRM_DEV_DEBUG_DRIVER(dev, "dp_hpd_change_default_func: %d\n",
1532 			     (u32)on);
1533 
1534 	if (on == 0) {
1535 		DRM_DEV_DEBUG_DRIVER(dev, " HPD low\n");
1536 		anx7625_remove_edid(ctx);
1537 		anx7625_stop_dp_work(ctx);
1538 	} else {
1539 		DRM_DEV_DEBUG_DRIVER(dev, " HPD high\n");
1540 		anx7625_start_dp_work(ctx);
1541 		anx7625_dp_adjust_swing(ctx);
1542 	}
1543 }
1544 
1545 static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
1546 {
1547 	int intr_vector, status;
1548 	struct device *dev = &ctx->client->dev;
1549 
1550 	status = anx7625_reg_write(ctx, ctx->i2c.tcpc_client,
1551 				   INTR_ALERT_1, 0xFF);
1552 	if (status < 0) {
1553 		DRM_DEV_ERROR(dev, "cannot clear alert reg.\n");
1554 		return status;
1555 	}
1556 
1557 	intr_vector = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
1558 				       INTERFACE_CHANGE_INT);
1559 	if (intr_vector < 0) {
1560 		DRM_DEV_ERROR(dev, "cannot access interrupt change reg.\n");
1561 		return intr_vector;
1562 	}
1563 	DRM_DEV_DEBUG_DRIVER(dev, "0x7e:0x44=%x\n", intr_vector);
1564 	status = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
1565 				   INTERFACE_CHANGE_INT,
1566 				   intr_vector & (~intr_vector));
1567 	if (status < 0) {
1568 		DRM_DEV_ERROR(dev, "cannot clear interrupt change reg.\n");
1569 		return status;
1570 	}
1571 
1572 	if (!(intr_vector & HPD_STATUS_CHANGE))
1573 		return -ENOENT;
1574 
1575 	status = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
1576 				  SYSTEM_STSTUS);
1577 	if (status < 0) {
1578 		DRM_DEV_ERROR(dev, "cannot clear interrupt status.\n");
1579 		return status;
1580 	}
1581 
1582 	DRM_DEV_DEBUG_DRIVER(dev, "0x7e:0x45=%x\n", status);
1583 	dp_hpd_change_handler(ctx, status & HPD_STATUS);
1584 
1585 	return 0;
1586 }
1587 
1588 static void anx7625_work_func(struct work_struct *work)
1589 {
1590 	int event;
1591 	struct anx7625_data *ctx = container_of(work,
1592 						struct anx7625_data, work);
1593 
1594 	mutex_lock(&ctx->lock);
1595 
1596 	if (pm_runtime_suspended(&ctx->client->dev))
1597 		goto unlock;
1598 
1599 	event = anx7625_hpd_change_detect(ctx);
1600 	if (event < 0)
1601 		goto unlock;
1602 
1603 	if (ctx->bridge_attached)
1604 		drm_helper_hpd_irq_event(ctx->bridge.dev);
1605 
1606 unlock:
1607 	mutex_unlock(&ctx->lock);
1608 }
1609 
1610 static irqreturn_t anx7625_intr_hpd_isr(int irq, void *data)
1611 {
1612 	struct anx7625_data *ctx = (struct anx7625_data *)data;
1613 
1614 	queue_work(ctx->workqueue, &ctx->work);
1615 
1616 	return IRQ_HANDLED;
1617 }
1618 
1619 static int anx7625_get_swing_setting(struct device *dev,
1620 				     struct anx7625_platform_data *pdata)
1621 {
1622 	int num_regs;
1623 
1624 	if (of_get_property(dev->of_node,
1625 			    "analogix,lane0-swing", &num_regs)) {
1626 		if (num_regs > DP_TX_SWING_REG_CNT)
1627 			num_regs = DP_TX_SWING_REG_CNT;
1628 
1629 		pdata->dp_lane0_swing_reg_cnt = num_regs;
1630 		of_property_read_u8_array(dev->of_node, "analogix,lane0-swing",
1631 					  pdata->lane0_reg_data, num_regs);
1632 	}
1633 
1634 	if (of_get_property(dev->of_node,
1635 			    "analogix,lane1-swing", &num_regs)) {
1636 		if (num_regs > DP_TX_SWING_REG_CNT)
1637 			num_regs = DP_TX_SWING_REG_CNT;
1638 
1639 		pdata->dp_lane1_swing_reg_cnt = num_regs;
1640 		of_property_read_u8_array(dev->of_node, "analogix,lane1-swing",
1641 					  pdata->lane1_reg_data, num_regs);
1642 	}
1643 
1644 	return 0;
1645 }
1646 
1647 static int anx7625_parse_dt(struct device *dev,
1648 			    struct anx7625_platform_data *pdata)
1649 {
1650 	struct device_node *np = dev->of_node, *ep0;
1651 	int bus_type, mipi_lanes;
1652 
1653 	anx7625_get_swing_setting(dev, pdata);
1654 
1655 	pdata->is_dpi = 0; /* default dsi mode */
1656 	of_node_put(pdata->mipi_host_node);
1657 	pdata->mipi_host_node = of_graph_get_remote_node(np, 0, 0);
1658 	if (!pdata->mipi_host_node) {
1659 		DRM_DEV_ERROR(dev, "fail to get internal panel.\n");
1660 		return -ENODEV;
1661 	}
1662 
1663 	bus_type = 0;
1664 	mipi_lanes = MAX_LANES_SUPPORT;
1665 	ep0 = of_graph_get_endpoint_by_regs(np, 0, 0);
1666 	if (ep0) {
1667 		if (of_property_read_u32(ep0, "bus-type", &bus_type))
1668 			bus_type = 0;
1669 
1670 		mipi_lanes = drm_of_get_data_lanes_count(ep0, 1, MAX_LANES_SUPPORT);
1671 		of_node_put(ep0);
1672 	}
1673 
1674 	if (bus_type == V4L2_FWNODE_BUS_TYPE_DPI) /* bus type is DPI */
1675 		pdata->is_dpi = 1;
1676 
1677 	pdata->mipi_lanes = MAX_LANES_SUPPORT;
1678 	if (mipi_lanes > 0)
1679 		pdata->mipi_lanes = mipi_lanes;
1680 
1681 	if (pdata->is_dpi)
1682 		DRM_DEV_DEBUG_DRIVER(dev, "found MIPI DPI host node.\n");
1683 	else
1684 		DRM_DEV_DEBUG_DRIVER(dev, "found MIPI DSI host node.\n");
1685 
1686 	if (of_property_read_bool(np, "analogix,audio-enable"))
1687 		pdata->audio_en = 1;
1688 
1689 	return 0;
1690 }
1691 
1692 static int anx7625_parse_dt_panel(struct device *dev,
1693 				  struct anx7625_platform_data *pdata)
1694 {
1695 	struct device_node *np = dev->of_node;
1696 
1697 	pdata->panel_bridge = devm_drm_of_get_bridge(dev, np, 1, 0);
1698 	if (IS_ERR(pdata->panel_bridge)) {
1699 		if (PTR_ERR(pdata->panel_bridge) == -ENODEV) {
1700 			pdata->panel_bridge = NULL;
1701 			return 0;
1702 		}
1703 
1704 		return PTR_ERR(pdata->panel_bridge);
1705 	}
1706 
1707 	DRM_DEV_DEBUG_DRIVER(dev, "get panel node.\n");
1708 
1709 	return 0;
1710 }
1711 
1712 static bool anx7625_of_panel_on_aux_bus(struct device *dev)
1713 {
1714 	struct device_node *bus, *panel;
1715 
1716 	bus = of_get_child_by_name(dev->of_node, "aux-bus");
1717 	if (!bus)
1718 		return false;
1719 
1720 	panel = of_get_child_by_name(bus, "panel");
1721 	of_node_put(bus);
1722 	if (!panel)
1723 		return false;
1724 	of_node_put(panel);
1725 
1726 	return true;
1727 }
1728 
1729 static inline struct anx7625_data *bridge_to_anx7625(struct drm_bridge *bridge)
1730 {
1731 	return container_of(bridge, struct anx7625_data, bridge);
1732 }
1733 
1734 static ssize_t anx7625_aux_transfer(struct drm_dp_aux *aux,
1735 				    struct drm_dp_aux_msg *msg)
1736 {
1737 	struct anx7625_data *ctx = container_of(aux, struct anx7625_data, aux);
1738 	struct device *dev = &ctx->client->dev;
1739 	u8 request = msg->request & ~DP_AUX_I2C_MOT;
1740 	int ret = 0;
1741 
1742 	pm_runtime_get_sync(dev);
1743 	msg->reply = 0;
1744 	switch (request) {
1745 	case DP_AUX_NATIVE_WRITE:
1746 	case DP_AUX_I2C_WRITE:
1747 	case DP_AUX_NATIVE_READ:
1748 	case DP_AUX_I2C_READ:
1749 		break;
1750 	default:
1751 		ret = -EINVAL;
1752 	}
1753 	if (!ret)
1754 		ret = anx7625_aux_trans(ctx, msg->request, msg->address,
1755 					msg->size, msg->buffer);
1756 	pm_runtime_mark_last_busy(dev);
1757 	pm_runtime_put_autosuspend(dev);
1758 
1759 	return ret;
1760 }
1761 
1762 static struct edid *anx7625_get_edid(struct anx7625_data *ctx)
1763 {
1764 	struct device *dev = &ctx->client->dev;
1765 	struct s_edid_data *p_edid = &ctx->slimport_edid_p;
1766 	int edid_num;
1767 	u8 *edid;
1768 
1769 	edid = kmalloc(FOUR_BLOCK_SIZE, GFP_KERNEL);
1770 	if (!edid) {
1771 		DRM_DEV_ERROR(dev, "Fail to allocate buffer\n");
1772 		return NULL;
1773 	}
1774 
1775 	if (ctx->slimport_edid_p.edid_block_num > 0) {
1776 		memcpy(edid, ctx->slimport_edid_p.edid_raw_data,
1777 		       FOUR_BLOCK_SIZE);
1778 		return (struct edid *)edid;
1779 	}
1780 
1781 	pm_runtime_get_sync(dev);
1782 	_anx7625_hpd_polling(ctx, 5000 * 100);
1783 	edid_num = sp_tx_edid_read(ctx, p_edid->edid_raw_data);
1784 	pm_runtime_put_sync(dev);
1785 
1786 	if (edid_num < 1) {
1787 		DRM_DEV_ERROR(dev, "Fail to read EDID: %d\n", edid_num);
1788 		kfree(edid);
1789 		return NULL;
1790 	}
1791 
1792 	p_edid->edid_block_num = edid_num;
1793 
1794 	memcpy(edid, ctx->slimport_edid_p.edid_raw_data, FOUR_BLOCK_SIZE);
1795 	return (struct edid *)edid;
1796 }
1797 
1798 static enum drm_connector_status anx7625_sink_detect(struct anx7625_data *ctx)
1799 {
1800 	struct device *dev = &ctx->client->dev;
1801 
1802 	DRM_DEV_DEBUG_DRIVER(dev, "sink detect\n");
1803 
1804 	if (ctx->pdata.panel_bridge)
1805 		return connector_status_connected;
1806 
1807 	return ctx->hpd_status ? connector_status_connected :
1808 				     connector_status_disconnected;
1809 }
1810 
1811 static int anx7625_audio_hw_params(struct device *dev, void *data,
1812 				   struct hdmi_codec_daifmt *fmt,
1813 				   struct hdmi_codec_params *params)
1814 {
1815 	struct anx7625_data *ctx = dev_get_drvdata(dev);
1816 	int wl, ch, rate;
1817 	int ret = 0;
1818 
1819 	if (anx7625_sink_detect(ctx) == connector_status_disconnected) {
1820 		DRM_DEV_DEBUG_DRIVER(dev, "DP not connected\n");
1821 		return 0;
1822 	}
1823 
1824 	if (fmt->fmt != HDMI_DSP_A && fmt->fmt != HDMI_I2S) {
1825 		DRM_DEV_ERROR(dev, "only supports DSP_A & I2S\n");
1826 		return -EINVAL;
1827 	}
1828 
1829 	DRM_DEV_DEBUG_DRIVER(dev, "setting %d Hz, %d bit, %d channels\n",
1830 			     params->sample_rate, params->sample_width,
1831 			     params->cea.channels);
1832 
1833 	if (fmt->fmt == HDMI_DSP_A)
1834 		ret = anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1835 					   AUDIO_CHANNEL_STATUS_6,
1836 					   ~I2S_SLAVE_MODE,
1837 					   TDM_SLAVE_MODE);
1838 	else
1839 		ret = anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1840 					   AUDIO_CHANNEL_STATUS_6,
1841 					   ~TDM_SLAVE_MODE,
1842 					   I2S_SLAVE_MODE);
1843 
1844 	/* Word length */
1845 	switch (params->sample_width) {
1846 	case 16:
1847 		wl = AUDIO_W_LEN_16_20MAX;
1848 		break;
1849 	case 18:
1850 		wl = AUDIO_W_LEN_18_20MAX;
1851 		break;
1852 	case 20:
1853 		wl = AUDIO_W_LEN_20_20MAX;
1854 		break;
1855 	case 24:
1856 		wl = AUDIO_W_LEN_24_24MAX;
1857 		break;
1858 	default:
1859 		DRM_DEV_DEBUG_DRIVER(dev, "wordlength: %d bit not support",
1860 				     params->sample_width);
1861 		return -EINVAL;
1862 	}
1863 	ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1864 				    AUDIO_CHANNEL_STATUS_5,
1865 				    0xf0, wl);
1866 
1867 	/* Channel num */
1868 	switch (params->cea.channels) {
1869 	case 2:
1870 		ch = I2S_CH_2;
1871 		break;
1872 	case 4:
1873 		ch = TDM_CH_4;
1874 		break;
1875 	case 6:
1876 		ch = TDM_CH_6;
1877 		break;
1878 	case 8:
1879 		ch = TDM_CH_8;
1880 		break;
1881 	default:
1882 		DRM_DEV_DEBUG_DRIVER(dev, "channel number: %d not support",
1883 				     params->cea.channels);
1884 		return -EINVAL;
1885 	}
1886 	ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1887 			       AUDIO_CHANNEL_STATUS_6, 0x1f, ch << 5);
1888 	if (ch > I2S_CH_2)
1889 		ret |= anx7625_write_or(ctx, ctx->i2c.tx_p2_client,
1890 				AUDIO_CHANNEL_STATUS_6, AUDIO_LAYOUT);
1891 	else
1892 		ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client,
1893 				AUDIO_CHANNEL_STATUS_6, ~AUDIO_LAYOUT);
1894 
1895 	/* FS */
1896 	switch (params->sample_rate) {
1897 	case 32000:
1898 		rate = AUDIO_FS_32K;
1899 		break;
1900 	case 44100:
1901 		rate = AUDIO_FS_441K;
1902 		break;
1903 	case 48000:
1904 		rate = AUDIO_FS_48K;
1905 		break;
1906 	case 88200:
1907 		rate = AUDIO_FS_882K;
1908 		break;
1909 	case 96000:
1910 		rate = AUDIO_FS_96K;
1911 		break;
1912 	case 176400:
1913 		rate = AUDIO_FS_1764K;
1914 		break;
1915 	case 192000:
1916 		rate = AUDIO_FS_192K;
1917 		break;
1918 	default:
1919 		DRM_DEV_DEBUG_DRIVER(dev, "sample rate: %d not support",
1920 				     params->sample_rate);
1921 		return -EINVAL;
1922 	}
1923 	ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
1924 				    AUDIO_CHANNEL_STATUS_4,
1925 				    0xf0, rate);
1926 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
1927 				AP_AV_STATUS, AP_AUDIO_CHG);
1928 	if (ret < 0) {
1929 		DRM_DEV_ERROR(dev, "IO error : config audio.\n");
1930 		return -EIO;
1931 	}
1932 
1933 	return 0;
1934 }
1935 
1936 static void anx7625_audio_shutdown(struct device *dev, void *data)
1937 {
1938 	DRM_DEV_DEBUG_DRIVER(dev, "stop audio\n");
1939 }
1940 
1941 static int anx7625_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
1942 				       struct device_node *endpoint)
1943 {
1944 	struct of_endpoint of_ep;
1945 	int ret;
1946 
1947 	ret = of_graph_parse_endpoint(endpoint, &of_ep);
1948 	if (ret < 0)
1949 		return ret;
1950 
1951 	/*
1952 	 * HDMI sound should be located at external DPI port
1953 	 * Didn't have good way to check where is internal(DSI)
1954 	 * or external(DPI) bridge
1955 	 */
1956 	return 0;
1957 }
1958 
1959 static void
1960 anx7625_audio_update_connector_status(struct anx7625_data *ctx,
1961 				      enum drm_connector_status status)
1962 {
1963 	if (ctx->plugged_cb && ctx->codec_dev) {
1964 		ctx->plugged_cb(ctx->codec_dev,
1965 				status == connector_status_connected);
1966 	}
1967 }
1968 
1969 static int anx7625_audio_hook_plugged_cb(struct device *dev, void *data,
1970 					 hdmi_codec_plugged_cb fn,
1971 					 struct device *codec_dev)
1972 {
1973 	struct anx7625_data *ctx = data;
1974 
1975 	ctx->plugged_cb = fn;
1976 	ctx->codec_dev = codec_dev;
1977 	anx7625_audio_update_connector_status(ctx, anx7625_sink_detect(ctx));
1978 
1979 	return 0;
1980 }
1981 
1982 static int anx7625_audio_get_eld(struct device *dev, void *data,
1983 				 u8 *buf, size_t len)
1984 {
1985 	struct anx7625_data *ctx = dev_get_drvdata(dev);
1986 
1987 	if (!ctx->connector) {
1988 		/* Pass en empty ELD if connector not available */
1989 		memset(buf, 0, len);
1990 	} else {
1991 		dev_dbg(dev, "audio copy eld\n");
1992 		memcpy(buf, ctx->connector->eld,
1993 		       min(sizeof(ctx->connector->eld), len));
1994 	}
1995 
1996 	return 0;
1997 }
1998 
1999 static const struct hdmi_codec_ops anx7625_codec_ops = {
2000 	.hw_params	= anx7625_audio_hw_params,
2001 	.audio_shutdown = anx7625_audio_shutdown,
2002 	.get_eld	= anx7625_audio_get_eld,
2003 	.get_dai_id	= anx7625_hdmi_i2s_get_dai_id,
2004 	.hook_plugged_cb = anx7625_audio_hook_plugged_cb,
2005 };
2006 
2007 static void anx7625_unregister_audio(struct anx7625_data *ctx)
2008 {
2009 	struct device *dev = &ctx->client->dev;
2010 
2011 	if (ctx->audio_pdev) {
2012 		platform_device_unregister(ctx->audio_pdev);
2013 		ctx->audio_pdev = NULL;
2014 	}
2015 
2016 	DRM_DEV_DEBUG_DRIVER(dev, "unbound to %s", HDMI_CODEC_DRV_NAME);
2017 }
2018 
2019 static int anx7625_register_audio(struct device *dev, struct anx7625_data *ctx)
2020 {
2021 	struct hdmi_codec_pdata codec_data = {
2022 		.ops = &anx7625_codec_ops,
2023 		.max_i2s_channels = 8,
2024 		.i2s = 1,
2025 		.data = ctx,
2026 	};
2027 
2028 	ctx->audio_pdev = platform_device_register_data(dev,
2029 							HDMI_CODEC_DRV_NAME,
2030 							PLATFORM_DEVID_AUTO,
2031 							&codec_data,
2032 							sizeof(codec_data));
2033 
2034 	if (IS_ERR(ctx->audio_pdev))
2035 		return PTR_ERR(ctx->audio_pdev);
2036 
2037 	DRM_DEV_DEBUG_DRIVER(dev, "bound to %s", HDMI_CODEC_DRV_NAME);
2038 
2039 	return 0;
2040 }
2041 
2042 static int anx7625_setup_dsi_device(struct anx7625_data *ctx)
2043 {
2044 	struct mipi_dsi_device *dsi;
2045 	struct device *dev = &ctx->client->dev;
2046 	struct mipi_dsi_host *host;
2047 	const struct mipi_dsi_device_info info = {
2048 		.type = "anx7625",
2049 		.channel = 0,
2050 		.node = NULL,
2051 	};
2052 
2053 	host = of_find_mipi_dsi_host_by_node(ctx->pdata.mipi_host_node);
2054 	if (!host) {
2055 		DRM_DEV_ERROR(dev, "fail to find dsi host.\n");
2056 		return -EPROBE_DEFER;
2057 	}
2058 
2059 	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
2060 	if (IS_ERR(dsi)) {
2061 		DRM_DEV_ERROR(dev, "fail to create dsi device.\n");
2062 		return -EINVAL;
2063 	}
2064 
2065 	dsi->lanes = ctx->pdata.mipi_lanes;
2066 	dsi->format = MIPI_DSI_FMT_RGB888;
2067 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO	|
2068 		MIPI_DSI_MODE_VIDEO_SYNC_PULSE	|
2069 		MIPI_DSI_MODE_VIDEO_HSE	|
2070 		MIPI_DSI_HS_PKT_END_ALIGNED;
2071 
2072 	ctx->dsi = dsi;
2073 
2074 	return 0;
2075 }
2076 
2077 static int anx7625_attach_dsi(struct anx7625_data *ctx)
2078 {
2079 	struct device *dev = &ctx->client->dev;
2080 	int ret;
2081 
2082 	DRM_DEV_DEBUG_DRIVER(dev, "attach dsi\n");
2083 
2084 	ret = devm_mipi_dsi_attach(dev, ctx->dsi);
2085 	if (ret) {
2086 		DRM_DEV_ERROR(dev, "fail to attach dsi to host.\n");
2087 		return ret;
2088 	}
2089 
2090 	DRM_DEV_DEBUG_DRIVER(dev, "attach dsi succeeded.\n");
2091 
2092 	return 0;
2093 }
2094 
2095 static void hdcp_check_work_func(struct work_struct *work)
2096 {
2097 	u8 status;
2098 	struct delayed_work *dwork;
2099 	struct anx7625_data *ctx;
2100 	struct device *dev;
2101 	struct drm_device *drm_dev;
2102 
2103 	dwork = to_delayed_work(work);
2104 	ctx = container_of(dwork, struct anx7625_data, hdcp_work);
2105 	dev = &ctx->client->dev;
2106 
2107 	if (!ctx->connector) {
2108 		dev_err(dev, "HDCP connector is null!");
2109 		return;
2110 	}
2111 
2112 	drm_dev = ctx->connector->dev;
2113 	drm_modeset_lock(&drm_dev->mode_config.connection_mutex, NULL);
2114 	mutex_lock(&ctx->hdcp_wq_lock);
2115 
2116 	status = anx7625_reg_read(ctx, ctx->i2c.tx_p0_client, 0);
2117 	dev_dbg(dev, "sink HDCP status check: %.02x\n", status);
2118 	if (status & BIT(1)) {
2119 		ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_ENABLED;
2120 		drm_hdcp_update_content_protection(ctx->connector,
2121 						   ctx->hdcp_cp);
2122 		dev_dbg(dev, "update CP to ENABLE\n");
2123 	}
2124 
2125 	mutex_unlock(&ctx->hdcp_wq_lock);
2126 	drm_modeset_unlock(&drm_dev->mode_config.connection_mutex);
2127 }
2128 
2129 static int anx7625_connector_atomic_check(struct anx7625_data *ctx,
2130 					  struct drm_connector_state *state)
2131 {
2132 	struct device *dev = &ctx->client->dev;
2133 	int cp;
2134 
2135 	dev_dbg(dev, "hdcp state check\n");
2136 	cp = state->content_protection;
2137 
2138 	if (cp == ctx->hdcp_cp)
2139 		return 0;
2140 
2141 	if (cp == DRM_MODE_CONTENT_PROTECTION_DESIRED) {
2142 		if (ctx->dp_en) {
2143 			dev_dbg(dev, "enable HDCP\n");
2144 			anx7625_hdcp_enable(ctx);
2145 
2146 			queue_delayed_work(ctx->hdcp_workqueue,
2147 					   &ctx->hdcp_work,
2148 					   msecs_to_jiffies(2000));
2149 		}
2150 	}
2151 
2152 	if (cp == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
2153 		if (ctx->hdcp_cp != DRM_MODE_CONTENT_PROTECTION_ENABLED) {
2154 			dev_err(dev, "current CP is not ENABLED\n");
2155 			return -EINVAL;
2156 		}
2157 		anx7625_hdcp_disable(ctx);
2158 		ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
2159 		drm_hdcp_update_content_protection(ctx->connector,
2160 						   ctx->hdcp_cp);
2161 		dev_dbg(dev, "update CP to UNDESIRE\n");
2162 	}
2163 
2164 	if (cp == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
2165 		dev_err(dev, "Userspace illegal set to PROTECTION ENABLE\n");
2166 		return -EINVAL;
2167 	}
2168 
2169 	return 0;
2170 }
2171 
2172 static int anx7625_bridge_attach(struct drm_bridge *bridge,
2173 				 enum drm_bridge_attach_flags flags)
2174 {
2175 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2176 	int err;
2177 	struct device *dev = &ctx->client->dev;
2178 
2179 	DRM_DEV_DEBUG_DRIVER(dev, "drm attach\n");
2180 	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
2181 		return -EINVAL;
2182 
2183 	if (!bridge->encoder) {
2184 		DRM_DEV_ERROR(dev, "Parent encoder object not found");
2185 		return -ENODEV;
2186 	}
2187 
2188 	ctx->aux.drm_dev = bridge->dev;
2189 	err = drm_dp_aux_register(&ctx->aux);
2190 	if (err) {
2191 		dev_err(dev, "failed to register aux channel: %d\n", err);
2192 		return err;
2193 	}
2194 
2195 	if (ctx->pdata.panel_bridge) {
2196 		err = drm_bridge_attach(bridge->encoder,
2197 					ctx->pdata.panel_bridge,
2198 					&ctx->bridge, flags);
2199 		if (err)
2200 			return err;
2201 	}
2202 
2203 	ctx->bridge_attached = 1;
2204 
2205 	return 0;
2206 }
2207 
2208 static void anx7625_bridge_detach(struct drm_bridge *bridge)
2209 {
2210 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2211 
2212 	drm_dp_aux_unregister(&ctx->aux);
2213 }
2214 
2215 static enum drm_mode_status
2216 anx7625_bridge_mode_valid(struct drm_bridge *bridge,
2217 			  const struct drm_display_info *info,
2218 			  const struct drm_display_mode *mode)
2219 {
2220 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2221 	struct device *dev = &ctx->client->dev;
2222 
2223 	DRM_DEV_DEBUG_DRIVER(dev, "drm mode checking\n");
2224 
2225 	/* Max 1200p at 5.4 Ghz, one lane, pixel clock 300M */
2226 	if (mode->clock > SUPPORT_PIXEL_CLOCK) {
2227 		DRM_DEV_DEBUG_DRIVER(dev,
2228 				     "drm mode invalid, pixelclock too high.\n");
2229 		return MODE_CLOCK_HIGH;
2230 	}
2231 
2232 	DRM_DEV_DEBUG_DRIVER(dev, "drm mode valid.\n");
2233 
2234 	return MODE_OK;
2235 }
2236 
2237 static void anx7625_bridge_mode_set(struct drm_bridge *bridge,
2238 				    const struct drm_display_mode *old_mode,
2239 				    const struct drm_display_mode *mode)
2240 {
2241 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2242 	struct device *dev = &ctx->client->dev;
2243 
2244 	DRM_DEV_DEBUG_DRIVER(dev, "drm mode set\n");
2245 
2246 	ctx->dt.pixelclock.min = mode->clock;
2247 	ctx->dt.hactive.min = mode->hdisplay;
2248 	ctx->dt.hsync_len.min = mode->hsync_end - mode->hsync_start;
2249 	ctx->dt.hfront_porch.min = mode->hsync_start - mode->hdisplay;
2250 	ctx->dt.hback_porch.min = mode->htotal - mode->hsync_end;
2251 	ctx->dt.vactive.min = mode->vdisplay;
2252 	ctx->dt.vsync_len.min = mode->vsync_end - mode->vsync_start;
2253 	ctx->dt.vfront_porch.min = mode->vsync_start - mode->vdisplay;
2254 	ctx->dt.vback_porch.min = mode->vtotal - mode->vsync_end;
2255 
2256 	ctx->display_timing_valid = 1;
2257 
2258 	DRM_DEV_DEBUG_DRIVER(dev, "pixelclock(%d).\n", ctx->dt.pixelclock.min);
2259 	DRM_DEV_DEBUG_DRIVER(dev, "hactive(%d), hsync(%d), hfp(%d), hbp(%d)\n",
2260 			     ctx->dt.hactive.min,
2261 			     ctx->dt.hsync_len.min,
2262 			     ctx->dt.hfront_porch.min,
2263 			     ctx->dt.hback_porch.min);
2264 	DRM_DEV_DEBUG_DRIVER(dev, "vactive(%d), vsync(%d), vfp(%d), vbp(%d)\n",
2265 			     ctx->dt.vactive.min,
2266 			     ctx->dt.vsync_len.min,
2267 			     ctx->dt.vfront_porch.min,
2268 			     ctx->dt.vback_porch.min);
2269 	DRM_DEV_DEBUG_DRIVER(dev, "hdisplay(%d),hsync_start(%d).\n",
2270 			     mode->hdisplay,
2271 			     mode->hsync_start);
2272 	DRM_DEV_DEBUG_DRIVER(dev, "hsync_end(%d),htotal(%d).\n",
2273 			     mode->hsync_end,
2274 			     mode->htotal);
2275 	DRM_DEV_DEBUG_DRIVER(dev, "vdisplay(%d),vsync_start(%d).\n",
2276 			     mode->vdisplay,
2277 			     mode->vsync_start);
2278 	DRM_DEV_DEBUG_DRIVER(dev, "vsync_end(%d),vtotal(%d).\n",
2279 			     mode->vsync_end,
2280 			     mode->vtotal);
2281 }
2282 
2283 static bool anx7625_bridge_mode_fixup(struct drm_bridge *bridge,
2284 				      const struct drm_display_mode *mode,
2285 				      struct drm_display_mode *adj)
2286 {
2287 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2288 	struct device *dev = &ctx->client->dev;
2289 	u32 hsync, hfp, hbp, hblanking;
2290 	u32 adj_hsync, adj_hfp, adj_hbp, adj_hblanking, delta_adj;
2291 	u32 vref, adj_clock;
2292 
2293 	DRM_DEV_DEBUG_DRIVER(dev, "drm mode fixup set\n");
2294 
2295 	/* No need fixup for external monitor */
2296 	if (!ctx->pdata.panel_bridge)
2297 		return true;
2298 
2299 	hsync = mode->hsync_end - mode->hsync_start;
2300 	hfp = mode->hsync_start - mode->hdisplay;
2301 	hbp = mode->htotal - mode->hsync_end;
2302 	hblanking = mode->htotal - mode->hdisplay;
2303 
2304 	DRM_DEV_DEBUG_DRIVER(dev, "before mode fixup\n");
2305 	DRM_DEV_DEBUG_DRIVER(dev, "hsync(%d), hfp(%d), hbp(%d), clock(%d)\n",
2306 			     hsync, hfp, hbp, adj->clock);
2307 	DRM_DEV_DEBUG_DRIVER(dev, "hsync_start(%d), hsync_end(%d), htot(%d)\n",
2308 			     adj->hsync_start, adj->hsync_end, adj->htotal);
2309 
2310 	adj_hfp = hfp;
2311 	adj_hsync = hsync;
2312 	adj_hbp = hbp;
2313 	adj_hblanking = hblanking;
2314 
2315 	/* HFP needs to be even */
2316 	if (hfp & 0x1) {
2317 		adj_hfp += 1;
2318 		adj_hblanking += 1;
2319 	}
2320 
2321 	/* HBP needs to be even */
2322 	if (hbp & 0x1) {
2323 		adj_hbp -= 1;
2324 		adj_hblanking -= 1;
2325 	}
2326 
2327 	/* HSYNC needs to be even */
2328 	if (hsync & 0x1) {
2329 		if (adj_hblanking < hblanking)
2330 			adj_hsync += 1;
2331 		else
2332 			adj_hsync -= 1;
2333 	}
2334 
2335 	/*
2336 	 * Once illegal timing detected, use default HFP, HSYNC, HBP
2337 	 * This adjusting made for built-in eDP panel, for the externel
2338 	 * DP monitor, may need return false.
2339 	 */
2340 	if (hblanking < HBLANKING_MIN || (hfp < HP_MIN && hbp < HP_MIN)) {
2341 		adj_hsync = SYNC_LEN_DEF;
2342 		adj_hfp = HFP_HBP_DEF;
2343 		adj_hbp = HFP_HBP_DEF;
2344 		vref = adj->clock * 1000 / (adj->htotal * adj->vtotal);
2345 		if (hblanking < HBLANKING_MIN) {
2346 			delta_adj = HBLANKING_MIN - hblanking;
2347 			adj_clock = vref * delta_adj * adj->vtotal;
2348 			adj->clock += DIV_ROUND_UP(adj_clock, 1000);
2349 		} else {
2350 			delta_adj = hblanking - HBLANKING_MIN;
2351 			adj_clock = vref * delta_adj * adj->vtotal;
2352 			adj->clock -= DIV_ROUND_UP(adj_clock, 1000);
2353 		}
2354 
2355 		DRM_WARN("illegal hblanking timing, use default.\n");
2356 		DRM_WARN("hfp(%d), hbp(%d), hsync(%d).\n", hfp, hbp, hsync);
2357 	} else if (adj_hfp < HP_MIN) {
2358 		/* Adjust hfp if hfp less than HP_MIN */
2359 		delta_adj = HP_MIN - adj_hfp;
2360 		adj_hfp = HP_MIN;
2361 
2362 		/*
2363 		 * Balance total HBlanking pixel, if HBP does not have enough
2364 		 * space, adjust HSYNC length, otherwise adjust HBP
2365 		 */
2366 		if ((adj_hbp - delta_adj) < HP_MIN)
2367 			/* HBP not enough space */
2368 			adj_hsync -= delta_adj;
2369 		else
2370 			adj_hbp -= delta_adj;
2371 	} else if (adj_hbp < HP_MIN) {
2372 		delta_adj = HP_MIN - adj_hbp;
2373 		adj_hbp = HP_MIN;
2374 
2375 		/*
2376 		 * Balance total HBlanking pixel, if HBP hasn't enough space,
2377 		 * adjust HSYNC length, otherwize adjust HBP
2378 		 */
2379 		if ((adj_hfp - delta_adj) < HP_MIN)
2380 			/* HFP not enough space */
2381 			adj_hsync -= delta_adj;
2382 		else
2383 			adj_hfp -= delta_adj;
2384 	}
2385 
2386 	DRM_DEV_DEBUG_DRIVER(dev, "after mode fixup\n");
2387 	DRM_DEV_DEBUG_DRIVER(dev, "hsync(%d), hfp(%d), hbp(%d), clock(%d)\n",
2388 			     adj_hsync, adj_hfp, adj_hbp, adj->clock);
2389 
2390 	/* Reconstruct timing */
2391 	adj->hsync_start = adj->hdisplay + adj_hfp;
2392 	adj->hsync_end = adj->hsync_start + adj_hsync;
2393 	adj->htotal = adj->hsync_end + adj_hbp;
2394 	DRM_DEV_DEBUG_DRIVER(dev, "hsync_start(%d), hsync_end(%d), htot(%d)\n",
2395 			     adj->hsync_start, adj->hsync_end, adj->htotal);
2396 
2397 	return true;
2398 }
2399 
2400 static int anx7625_bridge_atomic_check(struct drm_bridge *bridge,
2401 				       struct drm_bridge_state *bridge_state,
2402 				       struct drm_crtc_state *crtc_state,
2403 				       struct drm_connector_state *conn_state)
2404 {
2405 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2406 	struct device *dev = &ctx->client->dev;
2407 
2408 	dev_dbg(dev, "drm bridge atomic check\n");
2409 
2410 	anx7625_bridge_mode_fixup(bridge, &crtc_state->mode,
2411 				  &crtc_state->adjusted_mode);
2412 
2413 	return anx7625_connector_atomic_check(ctx, conn_state);
2414 }
2415 
2416 static void anx7625_bridge_atomic_enable(struct drm_bridge *bridge,
2417 					 struct drm_bridge_state *state)
2418 {
2419 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2420 	struct device *dev = &ctx->client->dev;
2421 	struct drm_connector *connector;
2422 
2423 	dev_dbg(dev, "drm atomic enable\n");
2424 
2425 	if (!bridge->encoder) {
2426 		dev_err(dev, "Parent encoder object not found");
2427 		return;
2428 	}
2429 
2430 	connector = drm_atomic_get_new_connector_for_encoder(state->base.state,
2431 							     bridge->encoder);
2432 	if (!connector)
2433 		return;
2434 
2435 	ctx->connector = connector;
2436 
2437 	pm_runtime_get_sync(dev);
2438 	_anx7625_hpd_polling(ctx, 5000 * 100);
2439 
2440 	anx7625_dp_start(ctx);
2441 }
2442 
2443 static void anx7625_bridge_atomic_disable(struct drm_bridge *bridge,
2444 					  struct drm_bridge_state *old)
2445 {
2446 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2447 	struct device *dev = &ctx->client->dev;
2448 
2449 	dev_dbg(dev, "drm atomic disable\n");
2450 
2451 	ctx->connector = NULL;
2452 	anx7625_dp_stop(ctx);
2453 
2454 	pm_runtime_put_sync(dev);
2455 }
2456 
2457 static enum drm_connector_status
2458 anx7625_bridge_detect(struct drm_bridge *bridge)
2459 {
2460 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2461 	struct device *dev = &ctx->client->dev;
2462 
2463 	DRM_DEV_DEBUG_DRIVER(dev, "drm bridge detect\n");
2464 
2465 	return anx7625_sink_detect(ctx);
2466 }
2467 
2468 static struct edid *anx7625_bridge_get_edid(struct drm_bridge *bridge,
2469 					    struct drm_connector *connector)
2470 {
2471 	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
2472 	struct device *dev = &ctx->client->dev;
2473 
2474 	DRM_DEV_DEBUG_DRIVER(dev, "drm bridge get edid\n");
2475 
2476 	return anx7625_get_edid(ctx);
2477 }
2478 
2479 static const struct drm_bridge_funcs anx7625_bridge_funcs = {
2480 	.attach = anx7625_bridge_attach,
2481 	.detach = anx7625_bridge_detach,
2482 	.mode_valid = anx7625_bridge_mode_valid,
2483 	.mode_set = anx7625_bridge_mode_set,
2484 	.atomic_check = anx7625_bridge_atomic_check,
2485 	.atomic_enable = anx7625_bridge_atomic_enable,
2486 	.atomic_disable = anx7625_bridge_atomic_disable,
2487 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
2488 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
2489 	.atomic_reset = drm_atomic_helper_bridge_reset,
2490 	.detect = anx7625_bridge_detect,
2491 	.get_edid = anx7625_bridge_get_edid,
2492 };
2493 
2494 static int anx7625_register_i2c_dummy_clients(struct anx7625_data *ctx,
2495 					      struct i2c_client *client)
2496 {
2497 	struct device *dev = &ctx->client->dev;
2498 
2499 	ctx->i2c.tx_p0_client = devm_i2c_new_dummy_device(dev, client->adapter,
2500 							  TX_P0_ADDR >> 1);
2501 	if (IS_ERR(ctx->i2c.tx_p0_client))
2502 		return PTR_ERR(ctx->i2c.tx_p0_client);
2503 
2504 	ctx->i2c.tx_p1_client = devm_i2c_new_dummy_device(dev, client->adapter,
2505 							  TX_P1_ADDR >> 1);
2506 	if (IS_ERR(ctx->i2c.tx_p1_client))
2507 		return PTR_ERR(ctx->i2c.tx_p1_client);
2508 
2509 	ctx->i2c.tx_p2_client = devm_i2c_new_dummy_device(dev, client->adapter,
2510 							  TX_P2_ADDR >> 1);
2511 	if (IS_ERR(ctx->i2c.tx_p2_client))
2512 		return PTR_ERR(ctx->i2c.tx_p2_client);
2513 
2514 	ctx->i2c.rx_p0_client = devm_i2c_new_dummy_device(dev, client->adapter,
2515 							  RX_P0_ADDR >> 1);
2516 	if (IS_ERR(ctx->i2c.rx_p0_client))
2517 		return PTR_ERR(ctx->i2c.rx_p0_client);
2518 
2519 	ctx->i2c.rx_p1_client = devm_i2c_new_dummy_device(dev, client->adapter,
2520 							  RX_P1_ADDR >> 1);
2521 	if (IS_ERR(ctx->i2c.rx_p1_client))
2522 		return PTR_ERR(ctx->i2c.rx_p1_client);
2523 
2524 	ctx->i2c.rx_p2_client = devm_i2c_new_dummy_device(dev, client->adapter,
2525 							  RX_P2_ADDR >> 1);
2526 	if (IS_ERR(ctx->i2c.rx_p2_client))
2527 		return PTR_ERR(ctx->i2c.rx_p2_client);
2528 
2529 	ctx->i2c.tcpc_client = devm_i2c_new_dummy_device(dev, client->adapter,
2530 							 TCPC_INTERFACE_ADDR >> 1);
2531 	if (IS_ERR(ctx->i2c.tcpc_client))
2532 		return PTR_ERR(ctx->i2c.tcpc_client);
2533 
2534 	return 0;
2535 }
2536 
2537 static int __maybe_unused anx7625_runtime_pm_suspend(struct device *dev)
2538 {
2539 	struct anx7625_data *ctx = dev_get_drvdata(dev);
2540 
2541 	mutex_lock(&ctx->lock);
2542 
2543 	anx7625_stop_dp_work(ctx);
2544 	anx7625_power_standby(ctx);
2545 
2546 	mutex_unlock(&ctx->lock);
2547 
2548 	return 0;
2549 }
2550 
2551 static int __maybe_unused anx7625_runtime_pm_resume(struct device *dev)
2552 {
2553 	struct anx7625_data *ctx = dev_get_drvdata(dev);
2554 
2555 	mutex_lock(&ctx->lock);
2556 
2557 	anx7625_power_on_init(ctx);
2558 
2559 	mutex_unlock(&ctx->lock);
2560 
2561 	return 0;
2562 }
2563 
2564 static const struct dev_pm_ops anx7625_pm_ops = {
2565 	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2566 				pm_runtime_force_resume)
2567 	SET_RUNTIME_PM_OPS(anx7625_runtime_pm_suspend,
2568 			   anx7625_runtime_pm_resume, NULL)
2569 };
2570 
2571 static void anx7625_runtime_disable(void *data)
2572 {
2573 	pm_runtime_dont_use_autosuspend(data);
2574 	pm_runtime_disable(data);
2575 }
2576 
2577 static int anx7625_link_bridge(struct drm_dp_aux *aux)
2578 {
2579 	struct anx7625_data *platform = container_of(aux, struct anx7625_data, aux);
2580 	struct device *dev = aux->dev;
2581 	int ret;
2582 
2583 	ret = anx7625_parse_dt_panel(dev, &platform->pdata);
2584 	if (ret) {
2585 		DRM_DEV_ERROR(dev, "fail to parse DT for panel : %d\n", ret);
2586 		return ret;
2587 	}
2588 
2589 	platform->bridge.funcs = &anx7625_bridge_funcs;
2590 	platform->bridge.of_node = dev->of_node;
2591 	if (!anx7625_of_panel_on_aux_bus(dev))
2592 		platform->bridge.ops |= DRM_BRIDGE_OP_EDID;
2593 	if (!platform->pdata.panel_bridge)
2594 		platform->bridge.ops |= DRM_BRIDGE_OP_HPD |
2595 					DRM_BRIDGE_OP_DETECT;
2596 	platform->bridge.type = platform->pdata.panel_bridge ?
2597 				    DRM_MODE_CONNECTOR_eDP :
2598 				    DRM_MODE_CONNECTOR_DisplayPort;
2599 
2600 	drm_bridge_add(&platform->bridge);
2601 
2602 	if (!platform->pdata.is_dpi) {
2603 		ret = anx7625_attach_dsi(platform);
2604 		if (ret)
2605 			drm_bridge_remove(&platform->bridge);
2606 	}
2607 
2608 	return ret;
2609 }
2610 
2611 static int anx7625_i2c_probe(struct i2c_client *client)
2612 {
2613 	struct anx7625_data *platform;
2614 	struct anx7625_platform_data *pdata;
2615 	int ret = 0;
2616 	struct device *dev = &client->dev;
2617 
2618 	if (!i2c_check_functionality(client->adapter,
2619 				     I2C_FUNC_SMBUS_I2C_BLOCK)) {
2620 		DRM_DEV_ERROR(dev, "anx7625's i2c bus doesn't support\n");
2621 		return -ENODEV;
2622 	}
2623 
2624 	platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);
2625 	if (!platform) {
2626 		DRM_DEV_ERROR(dev, "fail to allocate driver data\n");
2627 		return -ENOMEM;
2628 	}
2629 
2630 	pdata = &platform->pdata;
2631 
2632 	platform->client = client;
2633 	i2c_set_clientdata(client, platform);
2634 
2635 	pdata->supplies[0].supply = "vdd10";
2636 	pdata->supplies[1].supply = "vdd18";
2637 	pdata->supplies[2].supply = "vdd33";
2638 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pdata->supplies),
2639 				      pdata->supplies);
2640 	if (ret) {
2641 		DRM_DEV_ERROR(dev, "fail to get power supplies: %d\n", ret);
2642 		return ret;
2643 	}
2644 	anx7625_init_gpio(platform);
2645 
2646 	mutex_init(&platform->lock);
2647 	mutex_init(&platform->hdcp_wq_lock);
2648 
2649 	INIT_DELAYED_WORK(&platform->hdcp_work, hdcp_check_work_func);
2650 	platform->hdcp_workqueue = create_workqueue("hdcp workqueue");
2651 	if (!platform->hdcp_workqueue) {
2652 		dev_err(dev, "fail to create work queue\n");
2653 		ret = -ENOMEM;
2654 		return ret;
2655 	}
2656 
2657 	platform->pdata.intp_irq = client->irq;
2658 	if (platform->pdata.intp_irq) {
2659 		INIT_WORK(&platform->work, anx7625_work_func);
2660 		platform->workqueue = alloc_workqueue("anx7625_work",
2661 						      WQ_FREEZABLE | WQ_MEM_RECLAIM, 1);
2662 		if (!platform->workqueue) {
2663 			DRM_DEV_ERROR(dev, "fail to create work queue\n");
2664 			ret = -ENOMEM;
2665 			goto free_hdcp_wq;
2666 		}
2667 
2668 		ret = devm_request_threaded_irq(dev, platform->pdata.intp_irq,
2669 						NULL, anx7625_intr_hpd_isr,
2670 						IRQF_TRIGGER_FALLING |
2671 						IRQF_ONESHOT,
2672 						"anx7625-intp", platform);
2673 		if (ret) {
2674 			DRM_DEV_ERROR(dev, "fail to request irq\n");
2675 			goto free_wq;
2676 		}
2677 	}
2678 
2679 	platform->aux.name = "anx7625-aux";
2680 	platform->aux.dev = dev;
2681 	platform->aux.transfer = anx7625_aux_transfer;
2682 	platform->aux.wait_hpd_asserted = anx7625_wait_hpd_asserted;
2683 	drm_dp_aux_init(&platform->aux);
2684 
2685 	ret = anx7625_parse_dt(dev, pdata);
2686 	if (ret) {
2687 		if (ret != -EPROBE_DEFER)
2688 			DRM_DEV_ERROR(dev, "fail to parse DT : %d\n", ret);
2689 		goto free_wq;
2690 	}
2691 
2692 	if (!platform->pdata.is_dpi) {
2693 		ret = anx7625_setup_dsi_device(platform);
2694 		if (ret < 0)
2695 			goto free_wq;
2696 	}
2697 
2698 	/*
2699 	 * Registering the i2c devices will retrigger deferred probe, so it
2700 	 * needs to be done after calls that might return EPROBE_DEFER,
2701 	 * otherwise we can get an infinite loop.
2702 	 */
2703 	if (anx7625_register_i2c_dummy_clients(platform, client) != 0) {
2704 		ret = -ENOMEM;
2705 		DRM_DEV_ERROR(dev, "fail to reserve I2C bus.\n");
2706 		goto free_wq;
2707 	}
2708 
2709 	pm_runtime_enable(dev);
2710 	pm_runtime_set_autosuspend_delay(dev, 1000);
2711 	pm_runtime_use_autosuspend(dev);
2712 	pm_suspend_ignore_children(dev, true);
2713 	ret = devm_add_action_or_reset(dev, anx7625_runtime_disable, dev);
2714 	if (ret)
2715 		goto free_wq;
2716 
2717 	/*
2718 	 * Populating the aux bus will retrigger deferred probe, so it needs to
2719 	 * be done after calls that might return EPROBE_DEFER, otherwise we can
2720 	 * get an infinite loop.
2721 	 */
2722 	ret = devm_of_dp_aux_populate_bus(&platform->aux, anx7625_link_bridge);
2723 	if (ret) {
2724 		if (ret != -ENODEV) {
2725 			DRM_DEV_ERROR(dev, "failed to populate aux bus : %d\n", ret);
2726 			goto free_wq;
2727 		}
2728 
2729 		ret = anx7625_link_bridge(&platform->aux);
2730 		if (ret)
2731 			goto free_wq;
2732 	}
2733 
2734 	if (!platform->pdata.low_power_mode) {
2735 		anx7625_disable_pd_protocol(platform);
2736 		pm_runtime_get_sync(dev);
2737 		_anx7625_hpd_polling(platform, 5000 * 100);
2738 	}
2739 
2740 	/* Add work function */
2741 	if (platform->pdata.intp_irq)
2742 		queue_work(platform->workqueue, &platform->work);
2743 
2744 	if (platform->pdata.audio_en)
2745 		anx7625_register_audio(dev, platform);
2746 
2747 	DRM_DEV_DEBUG_DRIVER(dev, "probe done\n");
2748 
2749 	return 0;
2750 
2751 free_wq:
2752 	if (platform->workqueue)
2753 		destroy_workqueue(platform->workqueue);
2754 
2755 free_hdcp_wq:
2756 	if (platform->hdcp_workqueue)
2757 		destroy_workqueue(platform->hdcp_workqueue);
2758 
2759 	return ret;
2760 }
2761 
2762 static void anx7625_i2c_remove(struct i2c_client *client)
2763 {
2764 	struct anx7625_data *platform = i2c_get_clientdata(client);
2765 
2766 	drm_bridge_remove(&platform->bridge);
2767 
2768 	if (platform->pdata.intp_irq)
2769 		destroy_workqueue(platform->workqueue);
2770 
2771 	if (platform->hdcp_workqueue) {
2772 		cancel_delayed_work(&platform->hdcp_work);
2773 		flush_workqueue(platform->hdcp_workqueue);
2774 		destroy_workqueue(platform->hdcp_workqueue);
2775 	}
2776 
2777 	if (!platform->pdata.low_power_mode)
2778 		pm_runtime_put_sync_suspend(&client->dev);
2779 
2780 	if (platform->pdata.audio_en)
2781 		anx7625_unregister_audio(platform);
2782 }
2783 
2784 static const struct i2c_device_id anx7625_id[] = {
2785 	{"anx7625", 0},
2786 	{}
2787 };
2788 
2789 MODULE_DEVICE_TABLE(i2c, anx7625_id);
2790 
2791 static const struct of_device_id anx_match_table[] = {
2792 	{.compatible = "analogix,anx7625",},
2793 	{},
2794 };
2795 MODULE_DEVICE_TABLE(of, anx_match_table);
2796 
2797 static struct i2c_driver anx7625_driver = {
2798 	.driver = {
2799 		.name = "anx7625",
2800 		.of_match_table = anx_match_table,
2801 		.pm = &anx7625_pm_ops,
2802 	},
2803 	.probe = anx7625_i2c_probe,
2804 	.remove = anx7625_i2c_remove,
2805 
2806 	.id_table = anx7625_id,
2807 };
2808 
2809 module_i2c_driver(anx7625_driver);
2810 
2811 MODULE_DESCRIPTION("MIPI2DP anx7625 driver");
2812 MODULE_AUTHOR("Xin Ji <xji@analogixsemi.com>");
2813 MODULE_LICENSE("GPL v2");
2814 MODULE_VERSION(ANX7625_DRV_VERSION);
2815