1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Silicon Image SiI8620 HDMI/MHL bridge driver
4  *
5  * Copyright (C) 2015, Samsung Electronics Co., Ltd.
6  * Andrzej Hajda <a.hajda@samsung.com>
7  */
8 
9 #include <asm/unaligned.h>
10 
11 #include <drm/bridge/mhl.h>
12 #include <drm/drm_bridge.h>
13 #include <drm/drm_crtc.h>
14 #include <drm/drm_edid.h>
15 #include <drm/drm_encoder.h>
16 
17 #include <linux/clk.h>
18 #include <linux/delay.h>
19 #include <linux/extcon.h>
20 #include <linux/gpio/consumer.h>
21 #include <linux/i2c.h>
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/kernel.h>
25 #include <linux/list.h>
26 #include <linux/module.h>
27 #include <linux/mutex.h>
28 #include <linux/of_graph.h>
29 #include <linux/regulator/consumer.h>
30 #include <linux/slab.h>
31 
32 #include <media/rc-core.h>
33 
34 #include "sil-sii8620.h"
35 
36 #define SII8620_BURST_BUF_LEN 288
37 #define VAL_RX_HDMI_CTRL2_DEFVAL VAL_RX_HDMI_CTRL2_IDLE_CNT(3)
38 
39 #define MHL1_MAX_PCLK 75000
40 #define MHL1_MAX_PCLK_PP_MODE 150000
41 #define MHL3_MAX_PCLK 200000
42 #define MHL3_MAX_PCLK_PP_MODE 300000
43 
44 enum sii8620_mode {
45 	CM_DISCONNECTED,
46 	CM_DISCOVERY,
47 	CM_MHL1,
48 	CM_MHL3,
49 	CM_ECBUS_S
50 };
51 
52 enum sii8620_sink_type {
53 	SINK_NONE,
54 	SINK_HDMI,
55 	SINK_DVI
56 };
57 
58 enum sii8620_mt_state {
59 	MT_STATE_READY,
60 	MT_STATE_BUSY,
61 	MT_STATE_DONE
62 };
63 
64 struct sii8620 {
65 	struct drm_bridge bridge;
66 	struct device *dev;
67 	struct rc_dev *rc_dev;
68 	struct clk *clk_xtal;
69 	struct gpio_desc *gpio_reset;
70 	struct gpio_desc *gpio_int;
71 	struct regulator_bulk_data supplies[2];
72 	struct mutex lock; /* context lock, protects fields below */
73 	int error;
74 	unsigned int use_packed_pixel:1;
75 	enum sii8620_mode mode;
76 	enum sii8620_sink_type sink_type;
77 	u8 cbus_status;
78 	u8 stat[MHL_DST_SIZE];
79 	u8 xstat[MHL_XDS_SIZE];
80 	u8 devcap[MHL_DCAP_SIZE];
81 	u8 xdevcap[MHL_XDC_SIZE];
82 	bool feature_complete;
83 	bool devcap_read;
84 	bool sink_detected;
85 	struct edid *edid;
86 	unsigned int gen2_write_burst:1;
87 	enum sii8620_mt_state mt_state;
88 	struct extcon_dev *extcon;
89 	struct notifier_block extcon_nb;
90 	struct work_struct extcon_wq;
91 	int cable_state;
92 	struct list_head mt_queue;
93 	struct {
94 		int r_size;
95 		int r_count;
96 		int rx_ack;
97 		int rx_count;
98 		u8 rx_buf[32];
99 		int tx_count;
100 		u8 tx_buf[32];
101 	} burst;
102 };
103 
104 struct sii8620_mt_msg;
105 
106 typedef void (*sii8620_mt_msg_cb)(struct sii8620 *ctx,
107 				  struct sii8620_mt_msg *msg);
108 
109 typedef void (*sii8620_cb)(struct sii8620 *ctx, int ret);
110 
111 struct sii8620_mt_msg {
112 	struct list_head node;
113 	u8 reg[4];
114 	u8 ret;
115 	sii8620_mt_msg_cb send;
116 	sii8620_mt_msg_cb recv;
117 	sii8620_cb continuation;
118 };
119 
120 static const u8 sii8620_i2c_page[] = {
121 	0x39, /* Main System */
122 	0x3d, /* TDM and HSIC */
123 	0x49, /* TMDS Receiver, MHL EDID */
124 	0x4d, /* eMSC, HDCP, HSIC */
125 	0x5d, /* MHL Spec */
126 	0x64, /* MHL CBUS */
127 	0x59, /* Hardware TPI (Transmitter Programming Interface) */
128 	0x61, /* eCBUS-S, eCBUS-D */
129 };
130 
131 static void sii8620_fetch_edid(struct sii8620 *ctx);
132 static void sii8620_set_upstream_edid(struct sii8620 *ctx);
133 static void sii8620_enable_hpd(struct sii8620 *ctx);
134 static void sii8620_mhl_disconnected(struct sii8620 *ctx);
135 static void sii8620_disconnect(struct sii8620 *ctx);
136 
137 static int sii8620_clear_error(struct sii8620 *ctx)
138 {
139 	int ret = ctx->error;
140 
141 	ctx->error = 0;
142 	return ret;
143 }
144 
145 static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
146 {
147 	struct device *dev = ctx->dev;
148 	struct i2c_client *client = to_i2c_client(dev);
149 	u8 data = addr;
150 	struct i2c_msg msg[] = {
151 		{
152 			.addr = sii8620_i2c_page[addr >> 8],
153 			.flags = client->flags,
154 			.len = 1,
155 			.buf = &data
156 		},
157 		{
158 			.addr = sii8620_i2c_page[addr >> 8],
159 			.flags = client->flags | I2C_M_RD,
160 			.len = len,
161 			.buf = buf
162 		},
163 	};
164 	int ret;
165 
166 	if (ctx->error)
167 		return;
168 
169 	ret = i2c_transfer(client->adapter, msg, 2);
170 	dev_dbg(dev, "read at %04x: %*ph, %d\n", addr, len, buf, ret);
171 
172 	if (ret != 2) {
173 		dev_err(dev, "Read at %#06x of %d bytes failed with code %d.\n",
174 			addr, len, ret);
175 		ctx->error = ret < 0 ? ret : -EIO;
176 	}
177 }
178 
179 static u8 sii8620_readb(struct sii8620 *ctx, u16 addr)
180 {
181 	u8 ret;
182 
183 	sii8620_read_buf(ctx, addr, &ret, 1);
184 	return ret;
185 }
186 
187 static void sii8620_write_buf(struct sii8620 *ctx, u16 addr, const u8 *buf,
188 			      int len)
189 {
190 	struct device *dev = ctx->dev;
191 	struct i2c_client *client = to_i2c_client(dev);
192 	u8 data[2];
193 	struct i2c_msg msg = {
194 		.addr = sii8620_i2c_page[addr >> 8],
195 		.flags = client->flags,
196 		.len = len + 1,
197 	};
198 	int ret;
199 
200 	if (ctx->error)
201 		return;
202 
203 	if (len > 1) {
204 		msg.buf = kmalloc(len + 1, GFP_KERNEL);
205 		if (!msg.buf) {
206 			ctx->error = -ENOMEM;
207 			return;
208 		}
209 		memcpy(msg.buf + 1, buf, len);
210 	} else {
211 		msg.buf = data;
212 		msg.buf[1] = *buf;
213 	}
214 
215 	msg.buf[0] = addr;
216 
217 	ret = i2c_transfer(client->adapter, &msg, 1);
218 	dev_dbg(dev, "write at %04x: %*ph, %d\n", addr, len, buf, ret);
219 
220 	if (ret != 1) {
221 		dev_err(dev, "Write at %#06x of %*ph failed with code %d.\n",
222 			addr, len, buf, ret);
223 		ctx->error = ret ?: -EIO;
224 	}
225 
226 	if (len > 1)
227 		kfree(msg.buf);
228 }
229 
230 #define sii8620_write(ctx, addr, arr...) \
231 ({\
232 	u8 d[] = { arr }; \
233 	sii8620_write_buf(ctx, addr, d, ARRAY_SIZE(d)); \
234 })
235 
236 static void __sii8620_write_seq(struct sii8620 *ctx, const u16 *seq, int len)
237 {
238 	int i;
239 
240 	for (i = 0; i < len; i += 2)
241 		sii8620_write(ctx, seq[i], seq[i + 1]);
242 }
243 
244 #define sii8620_write_seq(ctx, seq...) \
245 ({\
246 	const u16 d[] = { seq }; \
247 	__sii8620_write_seq(ctx, d, ARRAY_SIZE(d)); \
248 })
249 
250 #define sii8620_write_seq_static(ctx, seq...) \
251 ({\
252 	static const u16 d[] = { seq }; \
253 	__sii8620_write_seq(ctx, d, ARRAY_SIZE(d)); \
254 })
255 
256 static void sii8620_setbits(struct sii8620 *ctx, u16 addr, u8 mask, u8 val)
257 {
258 	val = (val & mask) | (sii8620_readb(ctx, addr) & ~mask);
259 	sii8620_write(ctx, addr, val);
260 }
261 
262 static inline bool sii8620_is_mhl3(struct sii8620 *ctx)
263 {
264 	return ctx->mode >= CM_MHL3;
265 }
266 
267 static void sii8620_mt_cleanup(struct sii8620 *ctx)
268 {
269 	struct sii8620_mt_msg *msg, *n;
270 
271 	list_for_each_entry_safe(msg, n, &ctx->mt_queue, node) {
272 		list_del(&msg->node);
273 		kfree(msg);
274 	}
275 	ctx->mt_state = MT_STATE_READY;
276 }
277 
278 static void sii8620_mt_work(struct sii8620 *ctx)
279 {
280 	struct sii8620_mt_msg *msg;
281 
282 	if (ctx->error)
283 		return;
284 	if (ctx->mt_state == MT_STATE_BUSY || list_empty(&ctx->mt_queue))
285 		return;
286 
287 	if (ctx->mt_state == MT_STATE_DONE) {
288 		ctx->mt_state = MT_STATE_READY;
289 		msg = list_first_entry(&ctx->mt_queue, struct sii8620_mt_msg,
290 				       node);
291 		list_del(&msg->node);
292 		if (msg->recv)
293 			msg->recv(ctx, msg);
294 		if (msg->continuation)
295 			msg->continuation(ctx, msg->ret);
296 		kfree(msg);
297 	}
298 
299 	if (ctx->mt_state != MT_STATE_READY || list_empty(&ctx->mt_queue))
300 		return;
301 
302 	ctx->mt_state = MT_STATE_BUSY;
303 	msg = list_first_entry(&ctx->mt_queue, struct sii8620_mt_msg, node);
304 	if (msg->send)
305 		msg->send(ctx, msg);
306 }
307 
308 static void sii8620_enable_gen2_write_burst(struct sii8620 *ctx)
309 {
310 	u8 ctrl = BIT_MDT_RCV_CTRL_MDT_RCV_EN;
311 
312 	if (ctx->gen2_write_burst)
313 		return;
314 
315 	if (ctx->mode >= CM_MHL1)
316 		ctrl |= BIT_MDT_RCV_CTRL_MDT_DELAY_RCV_EN;
317 
318 	sii8620_write_seq(ctx,
319 		REG_MDT_RCV_TIMEOUT, 100,
320 		REG_MDT_RCV_CTRL, ctrl
321 	);
322 	ctx->gen2_write_burst = 1;
323 }
324 
325 static void sii8620_disable_gen2_write_burst(struct sii8620 *ctx)
326 {
327 	if (!ctx->gen2_write_burst)
328 		return;
329 
330 	sii8620_write_seq_static(ctx,
331 		REG_MDT_XMIT_CTRL, 0,
332 		REG_MDT_RCV_CTRL, 0
333 	);
334 	ctx->gen2_write_burst = 0;
335 }
336 
337 static void sii8620_start_gen2_write_burst(struct sii8620 *ctx)
338 {
339 	sii8620_write_seq_static(ctx,
340 		REG_MDT_INT_1_MASK, BIT_MDT_RCV_TIMEOUT
341 			| BIT_MDT_RCV_SM_ABORT_PKT_RCVD | BIT_MDT_RCV_SM_ERROR
342 			| BIT_MDT_XMIT_TIMEOUT | BIT_MDT_XMIT_SM_ABORT_PKT_RCVD
343 			| BIT_MDT_XMIT_SM_ERROR,
344 		REG_MDT_INT_0_MASK, BIT_MDT_XFIFO_EMPTY
345 			| BIT_MDT_IDLE_AFTER_HAWB_DISABLE
346 			| BIT_MDT_RFIFO_DATA_RDY
347 	);
348 	sii8620_enable_gen2_write_burst(ctx);
349 }
350 
351 static void sii8620_mt_msc_cmd_send(struct sii8620 *ctx,
352 				    struct sii8620_mt_msg *msg)
353 {
354 	if (msg->reg[0] == MHL_SET_INT &&
355 	    msg->reg[1] == MHL_INT_REG(RCHANGE) &&
356 	    msg->reg[2] == MHL_INT_RC_FEAT_REQ)
357 		sii8620_enable_gen2_write_burst(ctx);
358 	else
359 		sii8620_disable_gen2_write_burst(ctx);
360 
361 	switch (msg->reg[0]) {
362 	case MHL_WRITE_STAT:
363 	case MHL_SET_INT:
364 		sii8620_write_buf(ctx, REG_MSC_CMD_OR_OFFSET, msg->reg + 1, 2);
365 		sii8620_write(ctx, REG_MSC_COMMAND_START,
366 			      BIT_MSC_COMMAND_START_WRITE_STAT);
367 		break;
368 	case MHL_MSC_MSG:
369 		sii8620_write_buf(ctx, REG_MSC_CMD_OR_OFFSET, msg->reg, 3);
370 		sii8620_write(ctx, REG_MSC_COMMAND_START,
371 			      BIT_MSC_COMMAND_START_MSC_MSG);
372 		break;
373 	case MHL_READ_DEVCAP_REG:
374 	case MHL_READ_XDEVCAP_REG:
375 		sii8620_write(ctx, REG_MSC_CMD_OR_OFFSET, msg->reg[1]);
376 		sii8620_write(ctx, REG_MSC_COMMAND_START,
377 			      BIT_MSC_COMMAND_START_READ_DEVCAP);
378 		break;
379 	default:
380 		dev_err(ctx->dev, "%s: command %#x not supported\n", __func__,
381 			msg->reg[0]);
382 	}
383 }
384 
385 static struct sii8620_mt_msg *sii8620_mt_msg_new(struct sii8620 *ctx)
386 {
387 	struct sii8620_mt_msg *msg = kzalloc(sizeof(*msg), GFP_KERNEL);
388 
389 	if (!msg)
390 		ctx->error = -ENOMEM;
391 	else
392 		list_add_tail(&msg->node, &ctx->mt_queue);
393 
394 	return msg;
395 }
396 
397 static void sii8620_mt_set_cont(struct sii8620 *ctx, sii8620_cb cont)
398 {
399 	struct sii8620_mt_msg *msg;
400 
401 	if (ctx->error)
402 		return;
403 
404 	if (list_empty(&ctx->mt_queue)) {
405 		ctx->error = -EINVAL;
406 		return;
407 	}
408 	msg = list_last_entry(&ctx->mt_queue, struct sii8620_mt_msg, node);
409 	msg->continuation = cont;
410 }
411 
412 static void sii8620_mt_msc_cmd(struct sii8620 *ctx, u8 cmd, u8 arg1, u8 arg2)
413 {
414 	struct sii8620_mt_msg *msg = sii8620_mt_msg_new(ctx);
415 
416 	if (!msg)
417 		return;
418 
419 	msg->reg[0] = cmd;
420 	msg->reg[1] = arg1;
421 	msg->reg[2] = arg2;
422 	msg->send = sii8620_mt_msc_cmd_send;
423 }
424 
425 static void sii8620_mt_write_stat(struct sii8620 *ctx, u8 reg, u8 val)
426 {
427 	sii8620_mt_msc_cmd(ctx, MHL_WRITE_STAT, reg, val);
428 }
429 
430 static inline void sii8620_mt_set_int(struct sii8620 *ctx, u8 irq, u8 mask)
431 {
432 	sii8620_mt_msc_cmd(ctx, MHL_SET_INT, irq, mask);
433 }
434 
435 static void sii8620_mt_msc_msg(struct sii8620 *ctx, u8 cmd, u8 data)
436 {
437 	sii8620_mt_msc_cmd(ctx, MHL_MSC_MSG, cmd, data);
438 }
439 
440 static void sii8620_mt_rap(struct sii8620 *ctx, u8 code)
441 {
442 	sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RAP, code);
443 }
444 
445 static void sii8620_mt_rcpk(struct sii8620 *ctx, u8 code)
446 {
447 	sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RCPK, code);
448 }
449 
450 static void sii8620_mt_rcpe(struct sii8620 *ctx, u8 code)
451 {
452 	sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RCPE, code);
453 }
454 
455 static void sii8620_mt_read_devcap_send(struct sii8620 *ctx,
456 					struct sii8620_mt_msg *msg)
457 {
458 	u8 ctrl = BIT_EDID_CTRL_DEVCAP_SELECT_DEVCAP
459 			| BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO
460 			| BIT_EDID_CTRL_EDID_MODE_EN;
461 
462 	if (msg->reg[0] == MHL_READ_XDEVCAP)
463 		ctrl |= BIT_EDID_CTRL_XDEVCAP_EN;
464 
465 	sii8620_write_seq(ctx,
466 		REG_INTR9_MASK, BIT_INTR9_DEVCAP_DONE,
467 		REG_EDID_CTRL, ctrl,
468 		REG_TPI_CBUS_START, BIT_TPI_CBUS_START_GET_DEVCAP_START
469 	);
470 }
471 
472 /* copy src to dst and set changed bits in src */
473 static void sii8620_update_array(u8 *dst, u8 *src, int count)
474 {
475 	while (--count >= 0) {
476 		*src ^= *dst;
477 		*dst++ ^= *src++;
478 	}
479 }
480 
481 static void sii8620_identify_sink(struct sii8620 *ctx)
482 {
483 	static const char * const sink_str[] = {
484 		[SINK_NONE] = "NONE",
485 		[SINK_HDMI] = "HDMI",
486 		[SINK_DVI] = "DVI"
487 	};
488 
489 	char sink_name[20];
490 	struct device *dev = ctx->dev;
491 
492 	if (!ctx->sink_detected || !ctx->devcap_read)
493 		return;
494 
495 	sii8620_fetch_edid(ctx);
496 	if (!ctx->edid) {
497 		dev_err(ctx->dev, "Cannot fetch EDID\n");
498 		sii8620_mhl_disconnected(ctx);
499 		return;
500 	}
501 	sii8620_set_upstream_edid(ctx);
502 
503 	if (drm_detect_hdmi_monitor(ctx->edid))
504 		ctx->sink_type = SINK_HDMI;
505 	else
506 		ctx->sink_type = SINK_DVI;
507 
508 	drm_edid_get_monitor_name(ctx->edid, sink_name, ARRAY_SIZE(sink_name));
509 
510 	dev_info(dev, "detected sink(type: %s): %s\n",
511 		 sink_str[ctx->sink_type], sink_name);
512 }
513 
514 static void sii8620_mr_devcap(struct sii8620 *ctx)
515 {
516 	u8 dcap[MHL_DCAP_SIZE];
517 	struct device *dev = ctx->dev;
518 
519 	sii8620_read_buf(ctx, REG_EDID_FIFO_RD_DATA, dcap, MHL_DCAP_SIZE);
520 	if (ctx->error < 0)
521 		return;
522 
523 	dev_info(dev, "detected dongle MHL %d.%d, ChipID %02x%02x:%02x%02x\n",
524 		 dcap[MHL_DCAP_MHL_VERSION] / 16,
525 		 dcap[MHL_DCAP_MHL_VERSION] % 16,
526 		 dcap[MHL_DCAP_ADOPTER_ID_H], dcap[MHL_DCAP_ADOPTER_ID_L],
527 		 dcap[MHL_DCAP_DEVICE_ID_H], dcap[MHL_DCAP_DEVICE_ID_L]);
528 	sii8620_update_array(ctx->devcap, dcap, MHL_DCAP_SIZE);
529 	ctx->devcap_read = true;
530 	sii8620_identify_sink(ctx);
531 }
532 
533 static void sii8620_mr_xdevcap(struct sii8620 *ctx)
534 {
535 	sii8620_read_buf(ctx, REG_EDID_FIFO_RD_DATA, ctx->xdevcap,
536 			 MHL_XDC_SIZE);
537 }
538 
539 static void sii8620_mt_read_devcap_recv(struct sii8620 *ctx,
540 					struct sii8620_mt_msg *msg)
541 {
542 	u8 ctrl = BIT_EDID_CTRL_DEVCAP_SELECT_DEVCAP
543 		| BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO
544 		| BIT_EDID_CTRL_EDID_MODE_EN;
545 
546 	if (msg->reg[0] == MHL_READ_XDEVCAP)
547 		ctrl |= BIT_EDID_CTRL_XDEVCAP_EN;
548 
549 	sii8620_write_seq(ctx,
550 		REG_INTR9_MASK, BIT_INTR9_DEVCAP_DONE | BIT_INTR9_EDID_DONE
551 			| BIT_INTR9_EDID_ERROR,
552 		REG_EDID_CTRL, ctrl,
553 		REG_EDID_FIFO_ADDR, 0
554 	);
555 
556 	if (msg->reg[0] == MHL_READ_XDEVCAP)
557 		sii8620_mr_xdevcap(ctx);
558 	else
559 		sii8620_mr_devcap(ctx);
560 }
561 
562 static void sii8620_mt_read_devcap(struct sii8620 *ctx, bool xdevcap)
563 {
564 	struct sii8620_mt_msg *msg = sii8620_mt_msg_new(ctx);
565 
566 	if (!msg)
567 		return;
568 
569 	msg->reg[0] = xdevcap ? MHL_READ_XDEVCAP : MHL_READ_DEVCAP;
570 	msg->send = sii8620_mt_read_devcap_send;
571 	msg->recv = sii8620_mt_read_devcap_recv;
572 }
573 
574 static void sii8620_mt_read_devcap_reg_recv(struct sii8620 *ctx,
575 		struct sii8620_mt_msg *msg)
576 {
577 	u8 reg = msg->reg[1] & 0x7f;
578 
579 	if (msg->reg[1] & 0x80)
580 		ctx->xdevcap[reg] = msg->ret;
581 	else
582 		ctx->devcap[reg] = msg->ret;
583 }
584 
585 static void sii8620_mt_read_devcap_reg(struct sii8620 *ctx, u8 reg)
586 {
587 	struct sii8620_mt_msg *msg = sii8620_mt_msg_new(ctx);
588 
589 	if (!msg)
590 		return;
591 
592 	msg->reg[0] = (reg & 0x80) ? MHL_READ_XDEVCAP_REG : MHL_READ_DEVCAP_REG;
593 	msg->reg[1] = reg;
594 	msg->send = sii8620_mt_msc_cmd_send;
595 	msg->recv = sii8620_mt_read_devcap_reg_recv;
596 }
597 
598 static inline void sii8620_mt_read_xdevcap_reg(struct sii8620 *ctx, u8 reg)
599 {
600 	sii8620_mt_read_devcap_reg(ctx, reg | 0x80);
601 }
602 
603 static void *sii8620_burst_get_tx_buf(struct sii8620 *ctx, int len)
604 {
605 	u8 *buf = &ctx->burst.tx_buf[ctx->burst.tx_count];
606 	int size = len + 2;
607 
608 	if (ctx->burst.tx_count + size > ARRAY_SIZE(ctx->burst.tx_buf)) {
609 		dev_err(ctx->dev, "TX-BLK buffer exhausted\n");
610 		ctx->error = -EINVAL;
611 		return NULL;
612 	}
613 
614 	ctx->burst.tx_count += size;
615 	buf[1] = len;
616 
617 	return buf + 2;
618 }
619 
620 static u8 *sii8620_burst_get_rx_buf(struct sii8620 *ctx, int len)
621 {
622 	u8 *buf = &ctx->burst.rx_buf[ctx->burst.rx_count];
623 	int size = len + 1;
624 
625 	if (ctx->burst.tx_count + size > ARRAY_SIZE(ctx->burst.tx_buf)) {
626 		dev_err(ctx->dev, "RX-BLK buffer exhausted\n");
627 		ctx->error = -EINVAL;
628 		return NULL;
629 	}
630 
631 	ctx->burst.rx_count += size;
632 	buf[0] = len;
633 
634 	return buf + 1;
635 }
636 
637 static void sii8620_burst_send(struct sii8620 *ctx)
638 {
639 	int tx_left = ctx->burst.tx_count;
640 	u8 *d = ctx->burst.tx_buf;
641 
642 	while (tx_left > 0) {
643 		int len = d[1] + 2;
644 
645 		if (ctx->burst.r_count + len > ctx->burst.r_size)
646 			break;
647 		d[0] = min(ctx->burst.rx_ack, 255);
648 		ctx->burst.rx_ack -= d[0];
649 		sii8620_write_buf(ctx, REG_EMSC_XMIT_WRITE_PORT, d, len);
650 		ctx->burst.r_count += len;
651 		tx_left -= len;
652 		d += len;
653 	}
654 
655 	ctx->burst.tx_count = tx_left;
656 
657 	while (ctx->burst.rx_ack > 0) {
658 		u8 b[2] = { min(ctx->burst.rx_ack, 255), 0 };
659 
660 		if (ctx->burst.r_count + 2 > ctx->burst.r_size)
661 			break;
662 		ctx->burst.rx_ack -= b[0];
663 		sii8620_write_buf(ctx, REG_EMSC_XMIT_WRITE_PORT, b, 2);
664 		ctx->burst.r_count += 2;
665 	}
666 }
667 
668 static void sii8620_burst_receive(struct sii8620 *ctx)
669 {
670 	u8 buf[3], *d;
671 	int count;
672 
673 	sii8620_read_buf(ctx, REG_EMSCRFIFOBCNTL, buf, 2);
674 	count = get_unaligned_le16(buf);
675 	while (count > 0) {
676 		int len = min(count, 3);
677 
678 		sii8620_read_buf(ctx, REG_EMSC_RCV_READ_PORT, buf, len);
679 		count -= len;
680 		ctx->burst.rx_ack += len - 1;
681 		ctx->burst.r_count -= buf[1];
682 		if (ctx->burst.r_count < 0)
683 			ctx->burst.r_count = 0;
684 
685 		if (len < 3 || !buf[2])
686 			continue;
687 
688 		len = buf[2];
689 		d = sii8620_burst_get_rx_buf(ctx, len);
690 		if (!d)
691 			continue;
692 		sii8620_read_buf(ctx, REG_EMSC_RCV_READ_PORT, d, len);
693 		count -= len;
694 		ctx->burst.rx_ack += len;
695 	}
696 }
697 
698 static void sii8620_burst_tx_rbuf_info(struct sii8620 *ctx, int size)
699 {
700 	struct mhl_burst_blk_rcv_buffer_info *d =
701 		sii8620_burst_get_tx_buf(ctx, sizeof(*d));
702 	if (!d)
703 		return;
704 
705 	d->id = cpu_to_be16(MHL_BURST_ID_BLK_RCV_BUFFER_INFO);
706 	d->size = cpu_to_le16(size);
707 }
708 
709 static u8 sii8620_checksum(void *ptr, int size)
710 {
711 	u8 *d = ptr, sum = 0;
712 
713 	while (size--)
714 		sum += *d++;
715 
716 	return sum;
717 }
718 
719 static void sii8620_mhl_burst_hdr_set(struct mhl3_burst_header *h,
720 	enum mhl_burst_id id)
721 {
722 	h->id = cpu_to_be16(id);
723 	h->total_entries = 1;
724 	h->sequence_index = 1;
725 }
726 
727 static void sii8620_burst_tx_bits_per_pixel_fmt(struct sii8620 *ctx, u8 fmt)
728 {
729 	struct mhl_burst_bits_per_pixel_fmt *d;
730 	const int size = sizeof(*d) + sizeof(d->desc[0]);
731 
732 	d = sii8620_burst_get_tx_buf(ctx, size);
733 	if (!d)
734 		return;
735 
736 	sii8620_mhl_burst_hdr_set(&d->hdr, MHL_BURST_ID_BITS_PER_PIXEL_FMT);
737 	d->num_entries = 1;
738 	d->desc[0].stream_id = 0;
739 	d->desc[0].pixel_format = fmt;
740 	d->hdr.checksum -= sii8620_checksum(d, size);
741 }
742 
743 static void sii8620_burst_rx_all(struct sii8620 *ctx)
744 {
745 	u8 *d = ctx->burst.rx_buf;
746 	int count = ctx->burst.rx_count;
747 
748 	while (count-- > 0) {
749 		int len = *d++;
750 		int id = get_unaligned_be16(&d[0]);
751 
752 		switch (id) {
753 		case MHL_BURST_ID_BLK_RCV_BUFFER_INFO:
754 			ctx->burst.r_size = get_unaligned_le16(&d[2]);
755 			break;
756 		default:
757 			break;
758 		}
759 		count -= len;
760 		d += len;
761 	}
762 	ctx->burst.rx_count = 0;
763 }
764 
765 static void sii8620_fetch_edid(struct sii8620 *ctx)
766 {
767 	u8 lm_ddc, ddc_cmd, int3, cbus;
768 	unsigned long timeout;
769 	int fetched, i;
770 	int edid_len = EDID_LENGTH;
771 	u8 *edid;
772 
773 	sii8620_readb(ctx, REG_CBUS_STATUS);
774 	lm_ddc = sii8620_readb(ctx, REG_LM_DDC);
775 	ddc_cmd = sii8620_readb(ctx, REG_DDC_CMD);
776 
777 	sii8620_write_seq(ctx,
778 		REG_INTR9_MASK, 0,
779 		REG_EDID_CTRL, BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO,
780 		REG_HDCP2X_POLL_CS, 0x71,
781 		REG_HDCP2X_CTRL_0, BIT_HDCP2X_CTRL_0_HDCP2X_HDCPTX,
782 		REG_LM_DDC, lm_ddc | BIT_LM_DDC_SW_TPI_EN_DISABLED,
783 	);
784 
785 	for (i = 0; i < 256; ++i) {
786 		u8 ddc_stat = sii8620_readb(ctx, REG_DDC_STATUS);
787 
788 		if (!(ddc_stat & BIT_DDC_STATUS_DDC_I2C_IN_PROG))
789 			break;
790 		sii8620_write(ctx, REG_DDC_STATUS,
791 			      BIT_DDC_STATUS_DDC_FIFO_EMPTY);
792 	}
793 
794 	sii8620_write(ctx, REG_DDC_ADDR, 0x50 << 1);
795 
796 	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
797 	if (!edid) {
798 		ctx->error = -ENOMEM;
799 		return;
800 	}
801 
802 #define FETCH_SIZE 16
803 	for (fetched = 0; fetched < edid_len; fetched += FETCH_SIZE) {
804 		sii8620_readb(ctx, REG_DDC_STATUS);
805 		sii8620_write_seq(ctx,
806 			REG_DDC_CMD, ddc_cmd | VAL_DDC_CMD_DDC_CMD_ABORT,
807 			REG_DDC_CMD, ddc_cmd | VAL_DDC_CMD_DDC_CMD_CLEAR_FIFO,
808 			REG_DDC_STATUS, BIT_DDC_STATUS_DDC_FIFO_EMPTY
809 		);
810 		sii8620_write_seq(ctx,
811 			REG_DDC_SEGM, fetched >> 8,
812 			REG_DDC_OFFSET, fetched & 0xff,
813 			REG_DDC_DIN_CNT1, FETCH_SIZE,
814 			REG_DDC_DIN_CNT2, 0,
815 			REG_DDC_CMD, ddc_cmd | VAL_DDC_CMD_ENH_DDC_READ_NO_ACK
816 		);
817 
818 		int3 = 0;
819 		timeout = jiffies + msecs_to_jiffies(200);
820 		for (;;) {
821 			cbus = sii8620_readb(ctx, REG_CBUS_STATUS);
822 			if (~cbus & BIT_CBUS_STATUS_CBUS_CONNECTED) {
823 				kfree(edid);
824 				edid = NULL;
825 				goto end;
826 			}
827 			if (int3 & BIT_DDC_CMD_DONE) {
828 				if (sii8620_readb(ctx, REG_DDC_DOUT_CNT)
829 				    >= FETCH_SIZE)
830 					break;
831 			} else {
832 				int3 = sii8620_readb(ctx, REG_INTR3);
833 			}
834 			if (time_is_before_jiffies(timeout)) {
835 				ctx->error = -ETIMEDOUT;
836 				dev_err(ctx->dev, "timeout during EDID read\n");
837 				kfree(edid);
838 				edid = NULL;
839 				goto end;
840 			}
841 			usleep_range(10, 20);
842 		}
843 
844 		sii8620_read_buf(ctx, REG_DDC_DATA, edid + fetched, FETCH_SIZE);
845 		if (fetched + FETCH_SIZE == EDID_LENGTH) {
846 			u8 ext = ((struct edid *)edid)->extensions;
847 
848 			if (ext) {
849 				u8 *new_edid;
850 
851 				edid_len += ext * EDID_LENGTH;
852 				new_edid = krealloc(edid, edid_len, GFP_KERNEL);
853 				if (!new_edid) {
854 					kfree(edid);
855 					ctx->error = -ENOMEM;
856 					return;
857 				}
858 				edid = new_edid;
859 			}
860 		}
861 	}
862 
863 	sii8620_write_seq(ctx,
864 		REG_INTR3_MASK, BIT_DDC_CMD_DONE,
865 		REG_LM_DDC, lm_ddc
866 	);
867 
868 end:
869 	kfree(ctx->edid);
870 	ctx->edid = (struct edid *)edid;
871 }
872 
873 static void sii8620_set_upstream_edid(struct sii8620 *ctx)
874 {
875 	sii8620_setbits(ctx, REG_DPD, BIT_DPD_PDNRX12 | BIT_DPD_PDIDCK_N
876 			| BIT_DPD_PD_MHL_CLK_N, 0xff);
877 
878 	sii8620_write_seq_static(ctx,
879 		REG_RX_HDMI_CTRL3, 0x00,
880 		REG_PKT_FILTER_0, 0xFF,
881 		REG_PKT_FILTER_1, 0xFF,
882 		REG_ALICE0_BW_I2C, 0x06
883 	);
884 
885 	sii8620_setbits(ctx, REG_RX_HDMI_CLR_BUFFER,
886 			BIT_RX_HDMI_CLR_BUFFER_VSI_CLR_EN, 0xff);
887 
888 	sii8620_write_seq_static(ctx,
889 		REG_EDID_CTRL, BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO
890 			| BIT_EDID_CTRL_EDID_MODE_EN,
891 		REG_EDID_FIFO_ADDR, 0,
892 	);
893 
894 	sii8620_write_buf(ctx, REG_EDID_FIFO_WR_DATA, (u8 *)ctx->edid,
895 			  (ctx->edid->extensions + 1) * EDID_LENGTH);
896 
897 	sii8620_write_seq_static(ctx,
898 		REG_EDID_CTRL, BIT_EDID_CTRL_EDID_PRIME_VALID
899 			| BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO
900 			| BIT_EDID_CTRL_EDID_MODE_EN,
901 		REG_INTR5_MASK, BIT_INTR_SCDT_CHANGE,
902 		REG_INTR9_MASK, 0
903 	);
904 }
905 
906 static void sii8620_xtal_set_rate(struct sii8620 *ctx)
907 {
908 	static const struct {
909 		unsigned int rate;
910 		u8 div;
911 		u8 tp1;
912 	} rates[] = {
913 		{ 19200, 0x04, 0x53 },
914 		{ 20000, 0x04, 0x62 },
915 		{ 24000, 0x05, 0x75 },
916 		{ 30000, 0x06, 0x92 },
917 		{ 38400, 0x0c, 0xbc },
918 	};
919 	unsigned long rate = clk_get_rate(ctx->clk_xtal) / 1000;
920 	int i;
921 
922 	for (i = 0; i < ARRAY_SIZE(rates) - 1; ++i)
923 		if (rate <= rates[i].rate)
924 			break;
925 
926 	if (rate != rates[i].rate)
927 		dev_err(ctx->dev, "xtal clock rate(%lukHz) not supported, setting MHL for %ukHz.\n",
928 			rate, rates[i].rate);
929 
930 	sii8620_write(ctx, REG_DIV_CTL_MAIN, rates[i].div);
931 	sii8620_write(ctx, REG_HDCP2X_TP1, rates[i].tp1);
932 }
933 
934 static int sii8620_hw_on(struct sii8620 *ctx)
935 {
936 	int ret;
937 
938 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
939 	if (ret)
940 		return ret;
941 
942 	usleep_range(10000, 20000);
943 	ret = clk_prepare_enable(ctx->clk_xtal);
944 	if (ret)
945 		return ret;
946 
947 	msleep(100);
948 	gpiod_set_value(ctx->gpio_reset, 0);
949 	msleep(100);
950 
951 	return 0;
952 }
953 
954 static int sii8620_hw_off(struct sii8620 *ctx)
955 {
956 	clk_disable_unprepare(ctx->clk_xtal);
957 	gpiod_set_value(ctx->gpio_reset, 1);
958 	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
959 }
960 
961 static void sii8620_cbus_reset(struct sii8620 *ctx)
962 {
963 	sii8620_write(ctx, REG_PWD_SRST, BIT_PWD_SRST_CBUS_RST
964 		      | BIT_PWD_SRST_CBUS_RST_SW_EN);
965 	usleep_range(10000, 20000);
966 	sii8620_write(ctx, REG_PWD_SRST, BIT_PWD_SRST_CBUS_RST_SW_EN);
967 }
968 
969 static void sii8620_set_auto_zone(struct sii8620 *ctx)
970 {
971 	if (ctx->mode != CM_MHL1) {
972 		sii8620_write_seq_static(ctx,
973 			REG_TX_ZONE_CTL1, 0x0,
974 			REG_MHL_PLL_CTL0, VAL_MHL_PLL_CTL0_HDMI_CLK_RATIO_1X
975 				| BIT_MHL_PLL_CTL0_CRYSTAL_CLK_SEL
976 				| BIT_MHL_PLL_CTL0_ZONE_MASK_OE
977 		);
978 	} else {
979 		sii8620_write_seq_static(ctx,
980 			REG_TX_ZONE_CTL1, VAL_TX_ZONE_CTL1_TX_ZONE_CTRL_MODE,
981 			REG_MHL_PLL_CTL0, VAL_MHL_PLL_CTL0_HDMI_CLK_RATIO_1X
982 				| BIT_MHL_PLL_CTL0_ZONE_MASK_OE
983 		);
984 	}
985 }
986 
987 static void sii8620_stop_video(struct sii8620 *ctx)
988 {
989 	u8 uninitialized_var(val);
990 
991 	sii8620_write_seq_static(ctx,
992 		REG_TPI_INTR_EN, 0,
993 		REG_HDCP2X_INTR0_MASK, 0,
994 		REG_TPI_COPP_DATA2, 0,
995 		REG_TPI_INTR_ST0, ~0,
996 	);
997 
998 	switch (ctx->sink_type) {
999 	case SINK_DVI:
1000 		val = BIT_TPI_SC_REG_TMDS_OE_POWER_DOWN
1001 			| BIT_TPI_SC_TPI_AV_MUTE;
1002 		break;
1003 	case SINK_HDMI:
1004 	default:
1005 		val = BIT_TPI_SC_REG_TMDS_OE_POWER_DOWN
1006 			| BIT_TPI_SC_TPI_AV_MUTE
1007 			| BIT_TPI_SC_TPI_OUTPUT_MODE_0_HDMI;
1008 		break;
1009 	}
1010 
1011 	sii8620_write(ctx, REG_TPI_SC, val);
1012 }
1013 
1014 static void sii8620_set_format(struct sii8620 *ctx)
1015 {
1016 	u8 out_fmt;
1017 
1018 	if (sii8620_is_mhl3(ctx)) {
1019 		sii8620_setbits(ctx, REG_M3_P0CTRL,
1020 				BIT_M3_P0CTRL_MHL3_P0_PIXEL_MODE_PACKED,
1021 				ctx->use_packed_pixel ? ~0 : 0);
1022 	} else {
1023 		if (ctx->use_packed_pixel) {
1024 			sii8620_write_seq_static(ctx,
1025 				REG_VID_MODE, BIT_VID_MODE_M1080P,
1026 				REG_MHL_TOP_CTL, BIT_MHL_TOP_CTL_MHL_PP_SEL | 1,
1027 				REG_MHLTX_CTL6, 0x60
1028 			);
1029 		} else {
1030 			sii8620_write_seq_static(ctx,
1031 				REG_VID_MODE, 0,
1032 				REG_MHL_TOP_CTL, 1,
1033 				REG_MHLTX_CTL6, 0xa0
1034 			);
1035 		}
1036 	}
1037 
1038 	if (ctx->use_packed_pixel)
1039 		out_fmt = VAL_TPI_FORMAT(YCBCR422, FULL);
1040 	else
1041 		out_fmt = VAL_TPI_FORMAT(RGB, FULL);
1042 
1043 	sii8620_write_seq(ctx,
1044 		REG_TPI_INPUT, VAL_TPI_FORMAT(RGB, FULL),
1045 		REG_TPI_OUTPUT, out_fmt,
1046 	);
1047 }
1048 
1049 static int mhl3_infoframe_init(struct mhl3_infoframe *frame)
1050 {
1051 	memset(frame, 0, sizeof(*frame));
1052 
1053 	frame->version = 3;
1054 	frame->hev_format = -1;
1055 	return 0;
1056 }
1057 
1058 static ssize_t mhl3_infoframe_pack(struct mhl3_infoframe *frame,
1059 		 void *buffer, size_t size)
1060 {
1061 	const int frm_len = HDMI_INFOFRAME_HEADER_SIZE + MHL3_INFOFRAME_SIZE;
1062 	u8 *ptr = buffer;
1063 
1064 	if (size < frm_len)
1065 		return -ENOSPC;
1066 
1067 	memset(buffer, 0, size);
1068 	ptr[0] = HDMI_INFOFRAME_TYPE_VENDOR;
1069 	ptr[1] = frame->version;
1070 	ptr[2] = MHL3_INFOFRAME_SIZE;
1071 	ptr[4] = MHL3_IEEE_OUI & 0xff;
1072 	ptr[5] = (MHL3_IEEE_OUI >> 8) & 0xff;
1073 	ptr[6] = (MHL3_IEEE_OUI >> 16) & 0xff;
1074 	ptr[7] = frame->video_format & 0x3;
1075 	ptr[7] |= (frame->format_type & 0x7) << 2;
1076 	ptr[7] |= frame->sep_audio ? BIT(5) : 0;
1077 	if (frame->hev_format >= 0) {
1078 		ptr[9] = 1;
1079 		ptr[10] = (frame->hev_format >> 8) & 0xff;
1080 		ptr[11] = frame->hev_format & 0xff;
1081 	}
1082 	if (frame->av_delay) {
1083 		bool sign = frame->av_delay < 0;
1084 		int delay = sign ? -frame->av_delay : frame->av_delay;
1085 
1086 		ptr[12] = (delay >> 16) & 0xf;
1087 		if (sign)
1088 			ptr[12] |= BIT(4);
1089 		ptr[13] = (delay >> 8) & 0xff;
1090 		ptr[14] = delay & 0xff;
1091 	}
1092 	ptr[3] -= sii8620_checksum(buffer, frm_len);
1093 	return frm_len;
1094 }
1095 
1096 static void sii8620_set_infoframes(struct sii8620 *ctx,
1097 				   struct drm_display_mode *mode)
1098 {
1099 	struct mhl3_infoframe mhl_frm;
1100 	union hdmi_infoframe frm;
1101 	u8 buf[31];
1102 	int ret;
1103 
1104 	ret = drm_hdmi_avi_infoframe_from_display_mode(&frm.avi,
1105 						       NULL, mode);
1106 	if (ctx->use_packed_pixel)
1107 		frm.avi.colorspace = HDMI_COLORSPACE_YUV422;
1108 
1109 	if (!ret)
1110 		ret = hdmi_avi_infoframe_pack(&frm.avi, buf, ARRAY_SIZE(buf));
1111 	if (ret > 0)
1112 		sii8620_write_buf(ctx, REG_TPI_AVI_CHSUM, buf + 3, ret - 3);
1113 
1114 	if (!sii8620_is_mhl3(ctx) || !ctx->use_packed_pixel) {
1115 		sii8620_write(ctx, REG_TPI_SC,
1116 			BIT_TPI_SC_TPI_OUTPUT_MODE_0_HDMI);
1117 		sii8620_write(ctx, REG_PKT_FILTER_0,
1118 			BIT_PKT_FILTER_0_DROP_CEA_GAMUT_PKT |
1119 			BIT_PKT_FILTER_0_DROP_MPEG_PKT |
1120 			BIT_PKT_FILTER_0_DROP_GCP_PKT,
1121 			BIT_PKT_FILTER_1_DROP_GEN_PKT);
1122 		return;
1123 	}
1124 
1125 	sii8620_write(ctx, REG_PKT_FILTER_0,
1126 		BIT_PKT_FILTER_0_DROP_CEA_GAMUT_PKT |
1127 		BIT_PKT_FILTER_0_DROP_MPEG_PKT |
1128 		BIT_PKT_FILTER_0_DROP_AVI_PKT |
1129 		BIT_PKT_FILTER_0_DROP_GCP_PKT,
1130 		BIT_PKT_FILTER_1_VSI_OVERRIDE_DIS |
1131 		BIT_PKT_FILTER_1_DROP_GEN_PKT |
1132 		BIT_PKT_FILTER_1_DROP_VSIF_PKT);
1133 
1134 	sii8620_write(ctx, REG_TPI_INFO_FSEL, BIT_TPI_INFO_FSEL_EN
1135 		| BIT_TPI_INFO_FSEL_RPT | VAL_TPI_INFO_FSEL_VSI);
1136 	ret = mhl3_infoframe_init(&mhl_frm);
1137 	if (!ret)
1138 		ret = mhl3_infoframe_pack(&mhl_frm, buf, ARRAY_SIZE(buf));
1139 	sii8620_write_buf(ctx, REG_TPI_INFO_B0, buf, ret);
1140 }
1141 
1142 static void sii8620_start_video(struct sii8620 *ctx)
1143 {
1144 	struct drm_display_mode *mode =
1145 		&ctx->bridge.encoder->crtc->state->adjusted_mode;
1146 
1147 	if (!sii8620_is_mhl3(ctx))
1148 		sii8620_stop_video(ctx);
1149 
1150 	if (ctx->sink_type == SINK_DVI && !sii8620_is_mhl3(ctx)) {
1151 		sii8620_write(ctx, REG_RX_HDMI_CTRL2,
1152 			      VAL_RX_HDMI_CTRL2_DEFVAL);
1153 		sii8620_write(ctx, REG_TPI_SC, 0);
1154 		return;
1155 	}
1156 
1157 	sii8620_write_seq_static(ctx,
1158 		REG_RX_HDMI_CTRL2, VAL_RX_HDMI_CTRL2_DEFVAL
1159 			| BIT_RX_HDMI_CTRL2_USE_AV_MUTE,
1160 		REG_VID_OVRRD, BIT_VID_OVRRD_PP_AUTO_DISABLE
1161 			| BIT_VID_OVRRD_M1080P_OVRRD);
1162 	sii8620_set_format(ctx);
1163 
1164 	if (!sii8620_is_mhl3(ctx)) {
1165 		u8 link_mode = MHL_DST_LM_PATH_ENABLED;
1166 
1167 		if (ctx->use_packed_pixel)
1168 			link_mode |= MHL_DST_LM_CLK_MODE_PACKED_PIXEL;
1169 		else
1170 			link_mode |= MHL_DST_LM_CLK_MODE_NORMAL;
1171 
1172 		sii8620_mt_write_stat(ctx, MHL_DST_REG(LINK_MODE), link_mode);
1173 		sii8620_set_auto_zone(ctx);
1174 	} else {
1175 		static const struct {
1176 			int max_clk;
1177 			u8 zone;
1178 			u8 link_rate;
1179 			u8 rrp_decode;
1180 		} clk_spec[] = {
1181 			{ 150000, VAL_TX_ZONE_CTL3_TX_ZONE_1_5GBPS,
1182 			  MHL_XDS_LINK_RATE_1_5_GBPS, 0x38 },
1183 			{ 300000, VAL_TX_ZONE_CTL3_TX_ZONE_3GBPS,
1184 			  MHL_XDS_LINK_RATE_3_0_GBPS, 0x40 },
1185 			{ 600000, VAL_TX_ZONE_CTL3_TX_ZONE_6GBPS,
1186 			  MHL_XDS_LINK_RATE_6_0_GBPS, 0x40 },
1187 		};
1188 		u8 p0_ctrl = BIT_M3_P0CTRL_MHL3_P0_PORT_EN;
1189 		int clk = mode->clock * (ctx->use_packed_pixel ? 2 : 3);
1190 		int i;
1191 
1192 		for (i = 0; i < ARRAY_SIZE(clk_spec) - 1; ++i)
1193 			if (clk < clk_spec[i].max_clk)
1194 				break;
1195 
1196 		if (100 * clk >= 98 * clk_spec[i].max_clk)
1197 			p0_ctrl |= BIT_M3_P0CTRL_MHL3_P0_UNLIMIT_EN;
1198 
1199 		sii8620_burst_tx_bits_per_pixel_fmt(ctx, ctx->use_packed_pixel);
1200 		sii8620_burst_send(ctx);
1201 		sii8620_write_seq(ctx,
1202 			REG_MHL_DP_CTL0, 0xf0,
1203 			REG_MHL3_TX_ZONE_CTL, clk_spec[i].zone);
1204 		sii8620_setbits(ctx, REG_M3_P0CTRL,
1205 			BIT_M3_P0CTRL_MHL3_P0_PORT_EN
1206 			| BIT_M3_P0CTRL_MHL3_P0_UNLIMIT_EN, p0_ctrl);
1207 		sii8620_setbits(ctx, REG_M3_POSTM, MSK_M3_POSTM_RRP_DECODE,
1208 			clk_spec[i].rrp_decode);
1209 		sii8620_write_seq_static(ctx,
1210 			REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE
1211 				| BIT_M3_CTRL_H2M_SWRST,
1212 			REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE
1213 		);
1214 		sii8620_mt_write_stat(ctx, MHL_XDS_REG(AVLINK_MODE_CONTROL),
1215 			clk_spec[i].link_rate);
1216 	}
1217 
1218 	sii8620_set_infoframes(ctx, mode);
1219 }
1220 
1221 static void sii8620_disable_hpd(struct sii8620 *ctx)
1222 {
1223 	sii8620_setbits(ctx, REG_EDID_CTRL, BIT_EDID_CTRL_EDID_PRIME_VALID, 0);
1224 	sii8620_write_seq_static(ctx,
1225 		REG_HPD_CTRL, BIT_HPD_CTRL_HPD_OUT_OVR_EN,
1226 		REG_INTR8_MASK, 0
1227 	);
1228 }
1229 
1230 static void sii8620_enable_hpd(struct sii8620 *ctx)
1231 {
1232 	sii8620_setbits(ctx, REG_TMDS_CSTAT_P3,
1233 			BIT_TMDS_CSTAT_P3_SCDT_CLR_AVI_DIS
1234 			| BIT_TMDS_CSTAT_P3_CLR_AVI, ~0);
1235 	sii8620_write_seq_static(ctx,
1236 		REG_HPD_CTRL, BIT_HPD_CTRL_HPD_OUT_OVR_EN
1237 			| BIT_HPD_CTRL_HPD_HIGH,
1238 	);
1239 }
1240 
1241 static void sii8620_mhl_discover(struct sii8620 *ctx)
1242 {
1243 	sii8620_write_seq_static(ctx,
1244 		REG_DISC_CTRL9, BIT_DISC_CTRL9_WAKE_DRVFLT
1245 			| BIT_DISC_CTRL9_DISC_PULSE_PROCEED,
1246 		REG_DISC_CTRL4, VAL_DISC_CTRL4(VAL_PUP_5K, VAL_PUP_20K),
1247 		REG_CBUS_DISC_INTR0_MASK, BIT_MHL3_EST_INT
1248 			| BIT_MHL_EST_INT
1249 			| BIT_NOT_MHL_EST_INT
1250 			| BIT_CBUS_MHL3_DISCON_INT
1251 			| BIT_CBUS_MHL12_DISCON_INT
1252 			| BIT_RGND_READY_INT,
1253 		REG_MHL_PLL_CTL0, VAL_MHL_PLL_CTL0_HDMI_CLK_RATIO_1X
1254 			| BIT_MHL_PLL_CTL0_CRYSTAL_CLK_SEL
1255 			| BIT_MHL_PLL_CTL0_ZONE_MASK_OE,
1256 		REG_MHL_DP_CTL0, BIT_MHL_DP_CTL0_DP_OE
1257 			| BIT_MHL_DP_CTL0_TX_OE_OVR,
1258 		REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE,
1259 		REG_MHL_DP_CTL1, 0xA2,
1260 		REG_MHL_DP_CTL2, 0x03,
1261 		REG_MHL_DP_CTL3, 0x35,
1262 		REG_MHL_DP_CTL5, 0x02,
1263 		REG_MHL_DP_CTL6, 0x02,
1264 		REG_MHL_DP_CTL7, 0x03,
1265 		REG_COC_CTLC, 0xFF,
1266 		REG_DPD, BIT_DPD_PWRON_PLL | BIT_DPD_PDNTX12
1267 			| BIT_DPD_OSC_EN | BIT_DPD_PWRON_HSIC,
1268 		REG_COC_INTR_MASK, BIT_COC_PLL_LOCK_STATUS_CHANGE
1269 			| BIT_COC_CALIBRATION_DONE,
1270 		REG_CBUS_INT_1_MASK, BIT_CBUS_MSC_ABORT_RCVD
1271 			| BIT_CBUS_CMD_ABORT,
1272 		REG_CBUS_INT_0_MASK, BIT_CBUS_MSC_MT_DONE
1273 			| BIT_CBUS_HPD_CHG
1274 			| BIT_CBUS_MSC_MR_WRITE_STAT
1275 			| BIT_CBUS_MSC_MR_MSC_MSG
1276 			| BIT_CBUS_MSC_MR_WRITE_BURST
1277 			| BIT_CBUS_MSC_MR_SET_INT
1278 			| BIT_CBUS_MSC_MT_DONE_NACK
1279 	);
1280 }
1281 
1282 static void sii8620_peer_specific_init(struct sii8620 *ctx)
1283 {
1284 	if (sii8620_is_mhl3(ctx))
1285 		sii8620_write_seq_static(ctx,
1286 			REG_SYS_CTRL1, BIT_SYS_CTRL1_BLOCK_DDC_BY_HPD,
1287 			REG_EMSCINTRMASK1,
1288 				BIT_EMSCINTR1_EMSC_TRAINING_COMMA_ERR
1289 		);
1290 	else
1291 		sii8620_write_seq_static(ctx,
1292 			REG_HDCP2X_INTR0_MASK, 0x00,
1293 			REG_EMSCINTRMASK1, 0x00,
1294 			REG_HDCP2X_INTR0, 0xFF,
1295 			REG_INTR1, 0xFF,
1296 			REG_SYS_CTRL1, BIT_SYS_CTRL1_BLOCK_DDC_BY_HPD
1297 				| BIT_SYS_CTRL1_TX_CTRL_HDMI
1298 		);
1299 }
1300 
1301 #define SII8620_MHL_VERSION			0x32
1302 #define SII8620_SCRATCHPAD_SIZE			16
1303 #define SII8620_INT_STAT_SIZE			0x33
1304 
1305 static void sii8620_set_dev_cap(struct sii8620 *ctx)
1306 {
1307 	static const u8 devcap[MHL_DCAP_SIZE] = {
1308 		[MHL_DCAP_MHL_VERSION] = SII8620_MHL_VERSION,
1309 		[MHL_DCAP_CAT] = MHL_DCAP_CAT_SOURCE | MHL_DCAP_CAT_POWER,
1310 		[MHL_DCAP_ADOPTER_ID_H] = 0x01,
1311 		[MHL_DCAP_ADOPTER_ID_L] = 0x41,
1312 		[MHL_DCAP_VID_LINK_MODE] = MHL_DCAP_VID_LINK_RGB444
1313 			| MHL_DCAP_VID_LINK_PPIXEL
1314 			| MHL_DCAP_VID_LINK_16BPP,
1315 		[MHL_DCAP_AUD_LINK_MODE] = MHL_DCAP_AUD_LINK_2CH,
1316 		[MHL_DCAP_VIDEO_TYPE] = MHL_DCAP_VT_GRAPHICS,
1317 		[MHL_DCAP_LOG_DEV_MAP] = MHL_DCAP_LD_GUI,
1318 		[MHL_DCAP_BANDWIDTH] = 0x0f,
1319 		[MHL_DCAP_FEATURE_FLAG] = MHL_DCAP_FEATURE_RCP_SUPPORT
1320 			| MHL_DCAP_FEATURE_RAP_SUPPORT
1321 			| MHL_DCAP_FEATURE_SP_SUPPORT,
1322 		[MHL_DCAP_SCRATCHPAD_SIZE] = SII8620_SCRATCHPAD_SIZE,
1323 		[MHL_DCAP_INT_STAT_SIZE] = SII8620_INT_STAT_SIZE,
1324 	};
1325 	static const u8 xdcap[MHL_XDC_SIZE] = {
1326 		[MHL_XDC_ECBUS_SPEEDS] = MHL_XDC_ECBUS_S_075
1327 			| MHL_XDC_ECBUS_S_8BIT,
1328 		[MHL_XDC_TMDS_SPEEDS] = MHL_XDC_TMDS_150
1329 			| MHL_XDC_TMDS_300 | MHL_XDC_TMDS_600,
1330 		[MHL_XDC_ECBUS_ROLES] = MHL_XDC_DEV_HOST,
1331 		[MHL_XDC_LOG_DEV_MAPX] = MHL_XDC_LD_PHONE,
1332 	};
1333 
1334 	sii8620_write_buf(ctx, REG_MHL_DEVCAP_0, devcap, ARRAY_SIZE(devcap));
1335 	sii8620_write_buf(ctx, REG_MHL_EXTDEVCAP_0, xdcap, ARRAY_SIZE(xdcap));
1336 }
1337 
1338 static void sii8620_mhl_init(struct sii8620 *ctx)
1339 {
1340 	sii8620_write_seq_static(ctx,
1341 		REG_DISC_CTRL4, VAL_DISC_CTRL4(VAL_PUP_OFF, VAL_PUP_20K),
1342 		REG_CBUS_MSC_COMPAT_CTRL,
1343 			BIT_CBUS_MSC_COMPAT_CTRL_XDEVCAP_EN,
1344 	);
1345 
1346 	sii8620_peer_specific_init(ctx);
1347 
1348 	sii8620_disable_hpd(ctx);
1349 
1350 	sii8620_write_seq_static(ctx,
1351 		REG_EDID_CTRL, BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO,
1352 		REG_DISC_CTRL9, BIT_DISC_CTRL9_WAKE_DRVFLT
1353 			| BIT_DISC_CTRL9_WAKE_PULSE_BYPASS,
1354 		REG_TMDS0_CCTRL1, 0x90,
1355 		REG_TMDS_CLK_EN, 0x01,
1356 		REG_TMDS_CH_EN, 0x11,
1357 		REG_BGR_BIAS, 0x87,
1358 		REG_ALICE0_ZONE_CTRL, 0xE8,
1359 		REG_ALICE0_MODE_CTRL, 0x04,
1360 	);
1361 	sii8620_setbits(ctx, REG_LM_DDC, BIT_LM_DDC_SW_TPI_EN_DISABLED, 0);
1362 	sii8620_write_seq_static(ctx,
1363 		REG_TPI_HW_OPT3, 0x76,
1364 		REG_TMDS_CCTRL, BIT_TMDS_CCTRL_TMDS_OE,
1365 		REG_TPI_DTD_B2, 79,
1366 	);
1367 	sii8620_set_dev_cap(ctx);
1368 	sii8620_write_seq_static(ctx,
1369 		REG_MDT_XMIT_TIMEOUT, 100,
1370 		REG_MDT_XMIT_CTRL, 0x03,
1371 		REG_MDT_XFIFO_STAT, 0x00,
1372 		REG_MDT_RCV_TIMEOUT, 100,
1373 		REG_CBUS_LINK_CTRL_8, 0x1D,
1374 	);
1375 
1376 	sii8620_start_gen2_write_burst(ctx);
1377 	sii8620_write_seq_static(ctx,
1378 		REG_BIST_CTRL, 0x00,
1379 		REG_COC_CTL1, 0x10,
1380 		REG_COC_CTL2, 0x18,
1381 		REG_COC_CTLF, 0x07,
1382 		REG_COC_CTL11, 0xF8,
1383 		REG_COC_CTL17, 0x61,
1384 		REG_COC_CTL18, 0x46,
1385 		REG_COC_CTL19, 0x15,
1386 		REG_COC_CTL1A, 0x01,
1387 		REG_MHL_COC_CTL3, BIT_MHL_COC_CTL3_COC_AECHO_EN,
1388 		REG_MHL_COC_CTL4, 0x2D,
1389 		REG_MHL_COC_CTL5, 0xF9,
1390 		REG_MSC_HEARTBEAT_CTRL, 0x27,
1391 	);
1392 	sii8620_disable_gen2_write_burst(ctx);
1393 
1394 	sii8620_mt_write_stat(ctx, MHL_DST_REG(VERSION), SII8620_MHL_VERSION);
1395 	sii8620_mt_write_stat(ctx, MHL_DST_REG(CONNECTED_RDY),
1396 			      MHL_DST_CONN_DCAP_RDY | MHL_DST_CONN_XDEVCAPP_SUPP
1397 			      | MHL_DST_CONN_POW_STAT);
1398 	sii8620_mt_set_int(ctx, MHL_INT_REG(RCHANGE), MHL_INT_RC_DCAP_CHG);
1399 }
1400 
1401 static void sii8620_emsc_enable(struct sii8620 *ctx)
1402 {
1403 	u8 reg;
1404 
1405 	sii8620_setbits(ctx, REG_GENCTL, BIT_GENCTL_EMSC_EN
1406 					 | BIT_GENCTL_CLR_EMSC_RFIFO
1407 					 | BIT_GENCTL_CLR_EMSC_XFIFO, ~0);
1408 	sii8620_setbits(ctx, REG_GENCTL, BIT_GENCTL_CLR_EMSC_RFIFO
1409 					 | BIT_GENCTL_CLR_EMSC_XFIFO, 0);
1410 	sii8620_setbits(ctx, REG_COMMECNT, BIT_COMMECNT_I2C_TO_EMSC_EN, ~0);
1411 	reg = sii8620_readb(ctx, REG_EMSCINTR);
1412 	sii8620_write(ctx, REG_EMSCINTR, reg);
1413 	sii8620_write(ctx, REG_EMSCINTRMASK, BIT_EMSCINTR_SPI_DVLD);
1414 }
1415 
1416 static int sii8620_wait_for_fsm_state(struct sii8620 *ctx, u8 state)
1417 {
1418 	int i;
1419 
1420 	for (i = 0; i < 10; ++i) {
1421 		u8 s = sii8620_readb(ctx, REG_COC_STAT_0);
1422 
1423 		if ((s & MSK_COC_STAT_0_FSM_STATE) == state)
1424 			return 0;
1425 		if (!(s & BIT_COC_STAT_0_PLL_LOCKED))
1426 			return -EBUSY;
1427 		usleep_range(4000, 6000);
1428 	}
1429 	return -ETIMEDOUT;
1430 }
1431 
1432 static void sii8620_set_mode(struct sii8620 *ctx, enum sii8620_mode mode)
1433 {
1434 	int ret;
1435 
1436 	if (ctx->mode == mode)
1437 		return;
1438 
1439 	switch (mode) {
1440 	case CM_MHL1:
1441 		sii8620_write_seq_static(ctx,
1442 			REG_CBUS_MSC_COMPAT_CTRL, 0x02,
1443 			REG_M3_CTRL, VAL_M3_CTRL_MHL1_2_VALUE,
1444 			REG_DPD, BIT_DPD_PWRON_PLL | BIT_DPD_PDNTX12
1445 				| BIT_DPD_OSC_EN,
1446 			REG_COC_INTR_MASK, 0
1447 		);
1448 		ctx->mode = mode;
1449 		break;
1450 	case CM_MHL3:
1451 		sii8620_write(ctx, REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE);
1452 		ctx->mode = mode;
1453 		return;
1454 	case CM_ECBUS_S:
1455 		sii8620_emsc_enable(ctx);
1456 		sii8620_write_seq_static(ctx,
1457 			REG_TTXSPINUMS, 4,
1458 			REG_TRXSPINUMS, 4,
1459 			REG_TTXHSICNUMS, 0x14,
1460 			REG_TRXHSICNUMS, 0x14,
1461 			REG_TTXTOTNUMS, 0x18,
1462 			REG_TRXTOTNUMS, 0x18,
1463 			REG_PWD_SRST, BIT_PWD_SRST_COC_DOC_RST
1464 				      | BIT_PWD_SRST_CBUS_RST_SW_EN,
1465 			REG_MHL_COC_CTL1, 0xbd,
1466 			REG_PWD_SRST, BIT_PWD_SRST_CBUS_RST_SW_EN,
1467 			REG_COC_CTLB, 0x01,
1468 			REG_COC_CTL0, 0x5c,
1469 			REG_COC_CTL14, 0x03,
1470 			REG_COC_CTL15, 0x80,
1471 			REG_MHL_DP_CTL6, BIT_MHL_DP_CTL6_DP_TAP1_SGN
1472 					 | BIT_MHL_DP_CTL6_DP_TAP1_EN
1473 					 | BIT_MHL_DP_CTL6_DT_PREDRV_FEEDCAP_EN,
1474 			REG_MHL_DP_CTL8, 0x03
1475 		);
1476 		ret = sii8620_wait_for_fsm_state(ctx, 0x03);
1477 		sii8620_write_seq_static(ctx,
1478 			REG_COC_CTL14, 0x00,
1479 			REG_COC_CTL15, 0x80
1480 		);
1481 		if (!ret)
1482 			sii8620_write(ctx, REG_CBUS3_CNVT, 0x85);
1483 		else
1484 			sii8620_disconnect(ctx);
1485 		return;
1486 	case CM_DISCONNECTED:
1487 		ctx->mode = mode;
1488 		break;
1489 	default:
1490 		dev_err(ctx->dev, "%s mode %d not supported\n", __func__, mode);
1491 		break;
1492 	}
1493 
1494 	sii8620_set_auto_zone(ctx);
1495 
1496 	if (mode != CM_MHL1)
1497 		return;
1498 
1499 	sii8620_write_seq_static(ctx,
1500 		REG_MHL_DP_CTL0, 0xBC,
1501 		REG_MHL_DP_CTL1, 0xBB,
1502 		REG_MHL_DP_CTL3, 0x48,
1503 		REG_MHL_DP_CTL5, 0x39,
1504 		REG_MHL_DP_CTL2, 0x2A,
1505 		REG_MHL_DP_CTL6, 0x2A,
1506 		REG_MHL_DP_CTL7, 0x08
1507 	);
1508 }
1509 
1510 static void sii8620_hpd_unplugged(struct sii8620 *ctx)
1511 {
1512 	sii8620_disable_hpd(ctx);
1513 	ctx->sink_type = SINK_NONE;
1514 	ctx->sink_detected = false;
1515 	ctx->feature_complete = false;
1516 	kfree(ctx->edid);
1517 	ctx->edid = NULL;
1518 }
1519 
1520 static void sii8620_disconnect(struct sii8620 *ctx)
1521 {
1522 	sii8620_disable_gen2_write_burst(ctx);
1523 	sii8620_stop_video(ctx);
1524 	msleep(100);
1525 	sii8620_cbus_reset(ctx);
1526 	sii8620_set_mode(ctx, CM_DISCONNECTED);
1527 	sii8620_write_seq_static(ctx,
1528 		REG_TX_ZONE_CTL1, 0,
1529 		REG_MHL_PLL_CTL0, 0x07,
1530 		REG_COC_CTL0, 0x40,
1531 		REG_CBUS3_CNVT, 0x84,
1532 		REG_COC_CTL14, 0x00,
1533 		REG_COC_CTL0, 0x40,
1534 		REG_HRXCTRL3, 0x07,
1535 		REG_MHL_PLL_CTL0, VAL_MHL_PLL_CTL0_HDMI_CLK_RATIO_1X
1536 			| BIT_MHL_PLL_CTL0_CRYSTAL_CLK_SEL
1537 			| BIT_MHL_PLL_CTL0_ZONE_MASK_OE,
1538 		REG_MHL_DP_CTL0, BIT_MHL_DP_CTL0_DP_OE
1539 			| BIT_MHL_DP_CTL0_TX_OE_OVR,
1540 		REG_MHL_DP_CTL1, 0xBB,
1541 		REG_MHL_DP_CTL3, 0x48,
1542 		REG_MHL_DP_CTL5, 0x3F,
1543 		REG_MHL_DP_CTL2, 0x2F,
1544 		REG_MHL_DP_CTL6, 0x2A,
1545 		REG_MHL_DP_CTL7, 0x03
1546 	);
1547 	sii8620_hpd_unplugged(ctx);
1548 	sii8620_write_seq_static(ctx,
1549 		REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE,
1550 		REG_MHL_COC_CTL1, 0x07,
1551 		REG_DISC_CTRL4, VAL_DISC_CTRL4(VAL_PUP_OFF, VAL_PUP_20K),
1552 		REG_DISC_CTRL8, 0x00,
1553 		REG_DISC_CTRL9, BIT_DISC_CTRL9_WAKE_DRVFLT
1554 			| BIT_DISC_CTRL9_WAKE_PULSE_BYPASS,
1555 		REG_INT_CTRL, 0x00,
1556 		REG_MSC_HEARTBEAT_CTRL, 0x27,
1557 		REG_DISC_CTRL1, 0x25,
1558 		REG_CBUS_DISC_INTR0, (u8)~BIT_RGND_READY_INT,
1559 		REG_CBUS_DISC_INTR0_MASK, BIT_RGND_READY_INT,
1560 		REG_MDT_INT_1, 0xff,
1561 		REG_MDT_INT_1_MASK, 0x00,
1562 		REG_MDT_INT_0, 0xff,
1563 		REG_MDT_INT_0_MASK, 0x00,
1564 		REG_COC_INTR, 0xff,
1565 		REG_COC_INTR_MASK, 0x00,
1566 		REG_TRXINTH, 0xff,
1567 		REG_TRXINTMH, 0x00,
1568 		REG_CBUS_INT_0, 0xff,
1569 		REG_CBUS_INT_0_MASK, 0x00,
1570 		REG_CBUS_INT_1, 0xff,
1571 		REG_CBUS_INT_1_MASK, 0x00,
1572 		REG_EMSCINTR, 0xff,
1573 		REG_EMSCINTRMASK, 0x00,
1574 		REG_EMSCINTR1, 0xff,
1575 		REG_EMSCINTRMASK1, 0x00,
1576 		REG_INTR8, 0xff,
1577 		REG_INTR8_MASK, 0x00,
1578 		REG_TPI_INTR_ST0, 0xff,
1579 		REG_TPI_INTR_EN, 0x00,
1580 		REG_HDCP2X_INTR0, 0xff,
1581 		REG_HDCP2X_INTR0_MASK, 0x00,
1582 		REG_INTR9, 0xff,
1583 		REG_INTR9_MASK, 0x00,
1584 		REG_INTR3, 0xff,
1585 		REG_INTR3_MASK, 0x00,
1586 		REG_INTR5, 0xff,
1587 		REG_INTR5_MASK, 0x00,
1588 		REG_INTR2, 0xff,
1589 		REG_INTR2_MASK, 0x00,
1590 	);
1591 	memset(ctx->stat, 0, sizeof(ctx->stat));
1592 	memset(ctx->xstat, 0, sizeof(ctx->xstat));
1593 	memset(ctx->devcap, 0, sizeof(ctx->devcap));
1594 	memset(ctx->xdevcap, 0, sizeof(ctx->xdevcap));
1595 	ctx->devcap_read = false;
1596 	ctx->cbus_status = 0;
1597 	sii8620_mt_cleanup(ctx);
1598 }
1599 
1600 static void sii8620_mhl_disconnected(struct sii8620 *ctx)
1601 {
1602 	sii8620_write_seq_static(ctx,
1603 		REG_DISC_CTRL4, VAL_DISC_CTRL4(VAL_PUP_OFF, VAL_PUP_20K),
1604 		REG_CBUS_MSC_COMPAT_CTRL,
1605 			BIT_CBUS_MSC_COMPAT_CTRL_XDEVCAP_EN
1606 	);
1607 	sii8620_disconnect(ctx);
1608 }
1609 
1610 static void sii8620_irq_disc(struct sii8620 *ctx)
1611 {
1612 	u8 stat = sii8620_readb(ctx, REG_CBUS_DISC_INTR0);
1613 
1614 	if (stat & VAL_CBUS_MHL_DISCON)
1615 		sii8620_mhl_disconnected(ctx);
1616 
1617 	if (stat & BIT_RGND_READY_INT) {
1618 		u8 stat2 = sii8620_readb(ctx, REG_DISC_STAT2);
1619 
1620 		if ((stat2 & MSK_DISC_STAT2_RGND) == VAL_RGND_1K) {
1621 			sii8620_mhl_discover(ctx);
1622 		} else {
1623 			sii8620_write_seq_static(ctx,
1624 				REG_DISC_CTRL9, BIT_DISC_CTRL9_WAKE_DRVFLT
1625 					| BIT_DISC_CTRL9_NOMHL_EST
1626 					| BIT_DISC_CTRL9_WAKE_PULSE_BYPASS,
1627 				REG_CBUS_DISC_INTR0_MASK, BIT_RGND_READY_INT
1628 					| BIT_CBUS_MHL3_DISCON_INT
1629 					| BIT_CBUS_MHL12_DISCON_INT
1630 					| BIT_NOT_MHL_EST_INT
1631 			);
1632 		}
1633 	}
1634 	if (stat & BIT_MHL_EST_INT)
1635 		sii8620_mhl_init(ctx);
1636 
1637 	sii8620_write(ctx, REG_CBUS_DISC_INTR0, stat);
1638 }
1639 
1640 static void sii8620_read_burst(struct sii8620 *ctx)
1641 {
1642 	u8 buf[17];
1643 
1644 	sii8620_read_buf(ctx, REG_MDT_RCV_READ_PORT, buf, ARRAY_SIZE(buf));
1645 	sii8620_write(ctx, REG_MDT_RCV_CTRL, BIT_MDT_RCV_CTRL_MDT_RCV_EN |
1646 		      BIT_MDT_RCV_CTRL_MDT_DELAY_RCV_EN |
1647 		      BIT_MDT_RCV_CTRL_MDT_RFIFO_CLR_CUR);
1648 	sii8620_readb(ctx, REG_MDT_RFIFO_STAT);
1649 }
1650 
1651 static void sii8620_irq_g2wb(struct sii8620 *ctx)
1652 {
1653 	u8 stat = sii8620_readb(ctx, REG_MDT_INT_0);
1654 
1655 	if (stat & BIT_MDT_IDLE_AFTER_HAWB_DISABLE)
1656 		if (sii8620_is_mhl3(ctx))
1657 			sii8620_mt_set_int(ctx, MHL_INT_REG(RCHANGE),
1658 				MHL_INT_RC_FEAT_COMPLETE);
1659 
1660 	if (stat & BIT_MDT_RFIFO_DATA_RDY)
1661 		sii8620_read_burst(ctx);
1662 
1663 	if (stat & BIT_MDT_XFIFO_EMPTY)
1664 		sii8620_write(ctx, REG_MDT_XMIT_CTRL, 0);
1665 
1666 	sii8620_write(ctx, REG_MDT_INT_0, stat);
1667 }
1668 
1669 static void sii8620_status_dcap_ready(struct sii8620 *ctx)
1670 {
1671 	enum sii8620_mode mode;
1672 
1673 	mode = ctx->stat[MHL_DST_VERSION] >= 0x30 ? CM_MHL3 : CM_MHL1;
1674 	if (mode > ctx->mode)
1675 		sii8620_set_mode(ctx, mode);
1676 	sii8620_peer_specific_init(ctx);
1677 	sii8620_write(ctx, REG_INTR9_MASK, BIT_INTR9_DEVCAP_DONE
1678 		      | BIT_INTR9_EDID_DONE | BIT_INTR9_EDID_ERROR);
1679 }
1680 
1681 static void sii8620_status_changed_path(struct sii8620 *ctx)
1682 {
1683 	u8 link_mode;
1684 
1685 	if (ctx->use_packed_pixel)
1686 		link_mode = MHL_DST_LM_CLK_MODE_PACKED_PIXEL;
1687 	else
1688 		link_mode = MHL_DST_LM_CLK_MODE_NORMAL;
1689 
1690 	if (ctx->stat[MHL_DST_LINK_MODE] & MHL_DST_LM_PATH_ENABLED)
1691 		link_mode |= MHL_DST_LM_PATH_ENABLED;
1692 
1693 	sii8620_mt_write_stat(ctx, MHL_DST_REG(LINK_MODE),
1694 			      link_mode);
1695 }
1696 
1697 static void sii8620_msc_mr_write_stat(struct sii8620 *ctx)
1698 {
1699 	u8 st[MHL_DST_SIZE], xst[MHL_XDS_SIZE];
1700 
1701 	sii8620_read_buf(ctx, REG_MHL_STAT_0, st, MHL_DST_SIZE);
1702 	sii8620_read_buf(ctx, REG_MHL_EXTSTAT_0, xst, MHL_XDS_SIZE);
1703 
1704 	sii8620_update_array(ctx->stat, st, MHL_DST_SIZE);
1705 	sii8620_update_array(ctx->xstat, xst, MHL_XDS_SIZE);
1706 
1707 	if (ctx->stat[MHL_DST_CONNECTED_RDY] & st[MHL_DST_CONNECTED_RDY] &
1708 	    MHL_DST_CONN_DCAP_RDY) {
1709 		sii8620_status_dcap_ready(ctx);
1710 
1711 		if (!sii8620_is_mhl3(ctx))
1712 			sii8620_mt_read_devcap(ctx, false);
1713 	}
1714 
1715 	if (st[MHL_DST_LINK_MODE] & MHL_DST_LM_PATH_ENABLED)
1716 		sii8620_status_changed_path(ctx);
1717 }
1718 
1719 static void sii8620_ecbus_up(struct sii8620 *ctx, int ret)
1720 {
1721 	if (ret < 0)
1722 		return;
1723 
1724 	sii8620_set_mode(ctx, CM_ECBUS_S);
1725 }
1726 
1727 static void sii8620_got_ecbus_speed(struct sii8620 *ctx, int ret)
1728 {
1729 	if (ret < 0)
1730 		return;
1731 
1732 	sii8620_mt_write_stat(ctx, MHL_XDS_REG(CURR_ECBUS_MODE),
1733 			      MHL_XDS_ECBUS_S | MHL_XDS_SLOT_MODE_8BIT);
1734 	sii8620_mt_rap(ctx, MHL_RAP_CBUS_MODE_UP);
1735 	sii8620_mt_set_cont(ctx, sii8620_ecbus_up);
1736 }
1737 
1738 static void sii8620_mhl_burst_emsc_support_set(struct mhl_burst_emsc_support *d,
1739 	enum mhl_burst_id id)
1740 {
1741 	sii8620_mhl_burst_hdr_set(&d->hdr, MHL_BURST_ID_EMSC_SUPPORT);
1742 	d->num_entries = 1;
1743 	d->burst_id[0] = cpu_to_be16(id);
1744 }
1745 
1746 static void sii8620_send_features(struct sii8620 *ctx)
1747 {
1748 	u8 buf[16];
1749 
1750 	sii8620_write(ctx, REG_MDT_XMIT_CTRL, BIT_MDT_XMIT_CTRL_EN
1751 		| BIT_MDT_XMIT_CTRL_FIXED_BURST_LEN);
1752 	sii8620_mhl_burst_emsc_support_set((void *)buf,
1753 		MHL_BURST_ID_HID_PAYLOAD);
1754 	sii8620_write_buf(ctx, REG_MDT_XMIT_WRITE_PORT, buf, ARRAY_SIZE(buf));
1755 }
1756 
1757 static bool sii8620_rcp_consume(struct sii8620 *ctx, u8 scancode)
1758 {
1759 	bool pressed = !(scancode & MHL_RCP_KEY_RELEASED_MASK);
1760 
1761 	scancode &= MHL_RCP_KEY_ID_MASK;
1762 
1763 	if (!IS_ENABLED(CONFIG_RC_CORE) || !ctx->rc_dev)
1764 		return false;
1765 
1766 	if (pressed)
1767 		rc_keydown(ctx->rc_dev, RC_PROTO_CEC, scancode, 0);
1768 	else
1769 		rc_keyup(ctx->rc_dev);
1770 
1771 	return true;
1772 }
1773 
1774 static void sii8620_msc_mr_set_int(struct sii8620 *ctx)
1775 {
1776 	u8 ints[MHL_INT_SIZE];
1777 
1778 	sii8620_read_buf(ctx, REG_MHL_INT_0, ints, MHL_INT_SIZE);
1779 	sii8620_write_buf(ctx, REG_MHL_INT_0, ints, MHL_INT_SIZE);
1780 
1781 	if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_DCAP_CHG) {
1782 		switch (ctx->mode) {
1783 		case CM_MHL3:
1784 			sii8620_mt_read_xdevcap_reg(ctx, MHL_XDC_ECBUS_SPEEDS);
1785 			sii8620_mt_set_cont(ctx, sii8620_got_ecbus_speed);
1786 			break;
1787 		case CM_ECBUS_S:
1788 			sii8620_mt_read_devcap(ctx, true);
1789 			break;
1790 		default:
1791 			break;
1792 		}
1793 	}
1794 	if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_FEAT_REQ)
1795 		sii8620_send_features(ctx);
1796 	if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_FEAT_COMPLETE) {
1797 		ctx->feature_complete = true;
1798 		if (ctx->edid)
1799 			sii8620_enable_hpd(ctx);
1800 	}
1801 }
1802 
1803 static struct sii8620_mt_msg *sii8620_msc_msg_first(struct sii8620 *ctx)
1804 {
1805 	struct device *dev = ctx->dev;
1806 
1807 	if (list_empty(&ctx->mt_queue)) {
1808 		dev_err(dev, "unexpected MSC MT response\n");
1809 		return NULL;
1810 	}
1811 
1812 	return list_first_entry(&ctx->mt_queue, struct sii8620_mt_msg, node);
1813 }
1814 
1815 static void sii8620_msc_mt_done(struct sii8620 *ctx)
1816 {
1817 	struct sii8620_mt_msg *msg = sii8620_msc_msg_first(ctx);
1818 
1819 	if (!msg)
1820 		return;
1821 
1822 	msg->ret = sii8620_readb(ctx, REG_MSC_MT_RCVD_DATA0);
1823 	ctx->mt_state = MT_STATE_DONE;
1824 }
1825 
1826 static void sii8620_msc_mr_msc_msg(struct sii8620 *ctx)
1827 {
1828 	struct sii8620_mt_msg *msg;
1829 	u8 buf[2];
1830 
1831 	sii8620_read_buf(ctx, REG_MSC_MR_MSC_MSG_RCVD_1ST_DATA, buf, 2);
1832 
1833 	switch (buf[0]) {
1834 	case MHL_MSC_MSG_RAPK:
1835 		msg = sii8620_msc_msg_first(ctx);
1836 		if (!msg)
1837 			return;
1838 		msg->ret = buf[1];
1839 		ctx->mt_state = MT_STATE_DONE;
1840 		break;
1841 	case MHL_MSC_MSG_RCP:
1842 		if (!sii8620_rcp_consume(ctx, buf[1]))
1843 			sii8620_mt_rcpe(ctx,
1844 					MHL_RCPE_STATUS_INEFFECTIVE_KEY_CODE);
1845 		sii8620_mt_rcpk(ctx, buf[1]);
1846 		break;
1847 	default:
1848 		dev_err(ctx->dev, "%s message type %d,%d not supported",
1849 			__func__, buf[0], buf[1]);
1850 	}
1851 }
1852 
1853 static void sii8620_irq_msc(struct sii8620 *ctx)
1854 {
1855 	u8 stat = sii8620_readb(ctx, REG_CBUS_INT_0);
1856 
1857 	if (stat & ~BIT_CBUS_HPD_CHG)
1858 		sii8620_write(ctx, REG_CBUS_INT_0, stat & ~BIT_CBUS_HPD_CHG);
1859 
1860 	if (stat & BIT_CBUS_HPD_CHG) {
1861 		u8 cbus_stat = sii8620_readb(ctx, REG_CBUS_STATUS);
1862 
1863 		if ((cbus_stat ^ ctx->cbus_status) & BIT_CBUS_STATUS_CBUS_HPD) {
1864 			sii8620_write(ctx, REG_CBUS_INT_0, BIT_CBUS_HPD_CHG);
1865 		} else {
1866 			stat ^= BIT_CBUS_STATUS_CBUS_HPD;
1867 			cbus_stat ^= BIT_CBUS_STATUS_CBUS_HPD;
1868 		}
1869 		ctx->cbus_status = cbus_stat;
1870 	}
1871 
1872 	if (stat & BIT_CBUS_MSC_MR_WRITE_STAT)
1873 		sii8620_msc_mr_write_stat(ctx);
1874 
1875 	if (stat & BIT_CBUS_HPD_CHG) {
1876 		if (ctx->cbus_status & BIT_CBUS_STATUS_CBUS_HPD) {
1877 			ctx->sink_detected = true;
1878 			sii8620_identify_sink(ctx);
1879 		} else {
1880 			sii8620_hpd_unplugged(ctx);
1881 		}
1882 	}
1883 
1884 	if (stat & BIT_CBUS_MSC_MR_SET_INT)
1885 		sii8620_msc_mr_set_int(ctx);
1886 
1887 	if (stat & BIT_CBUS_MSC_MT_DONE)
1888 		sii8620_msc_mt_done(ctx);
1889 
1890 	if (stat & BIT_CBUS_MSC_MR_MSC_MSG)
1891 		sii8620_msc_mr_msc_msg(ctx);
1892 }
1893 
1894 static void sii8620_irq_coc(struct sii8620 *ctx)
1895 {
1896 	u8 stat = sii8620_readb(ctx, REG_COC_INTR);
1897 
1898 	if (stat & BIT_COC_CALIBRATION_DONE) {
1899 		u8 cstat = sii8620_readb(ctx, REG_COC_STAT_0);
1900 
1901 		cstat &= BIT_COC_STAT_0_PLL_LOCKED | MSK_COC_STAT_0_FSM_STATE;
1902 		if (cstat == (BIT_COC_STAT_0_PLL_LOCKED | 0x02)) {
1903 			sii8620_write_seq_static(ctx,
1904 				REG_COC_CTLB, 0,
1905 				REG_TRXINTMH, BIT_TDM_INTR_SYNC_DATA
1906 					      | BIT_TDM_INTR_SYNC_WAIT
1907 			);
1908 		}
1909 	}
1910 
1911 	sii8620_write(ctx, REG_COC_INTR, stat);
1912 }
1913 
1914 static void sii8620_irq_merr(struct sii8620 *ctx)
1915 {
1916 	u8 stat = sii8620_readb(ctx, REG_CBUS_INT_1);
1917 
1918 	sii8620_write(ctx, REG_CBUS_INT_1, stat);
1919 }
1920 
1921 static void sii8620_irq_edid(struct sii8620 *ctx)
1922 {
1923 	u8 stat = sii8620_readb(ctx, REG_INTR9);
1924 
1925 	sii8620_write(ctx, REG_INTR9, stat);
1926 
1927 	if (stat & BIT_INTR9_DEVCAP_DONE)
1928 		ctx->mt_state = MT_STATE_DONE;
1929 }
1930 
1931 static void sii8620_irq_scdt(struct sii8620 *ctx)
1932 {
1933 	u8 stat = sii8620_readb(ctx, REG_INTR5);
1934 
1935 	if (stat & BIT_INTR_SCDT_CHANGE) {
1936 		u8 cstat = sii8620_readb(ctx, REG_TMDS_CSTAT_P3);
1937 
1938 		if (cstat & BIT_TMDS_CSTAT_P3_SCDT)
1939 			sii8620_start_video(ctx);
1940 	}
1941 
1942 	sii8620_write(ctx, REG_INTR5, stat);
1943 }
1944 
1945 static void sii8620_got_xdevcap(struct sii8620 *ctx, int ret)
1946 {
1947 	if (ret < 0)
1948 		return;
1949 
1950 	sii8620_mt_read_devcap(ctx, false);
1951 }
1952 
1953 static void sii8620_irq_tdm(struct sii8620 *ctx)
1954 {
1955 	u8 stat = sii8620_readb(ctx, REG_TRXINTH);
1956 	u8 tdm = sii8620_readb(ctx, REG_TRXSTA2);
1957 
1958 	if ((tdm & MSK_TDM_SYNCHRONIZED) == VAL_TDM_SYNCHRONIZED) {
1959 		ctx->mode = CM_ECBUS_S;
1960 		ctx->burst.rx_ack = 0;
1961 		ctx->burst.r_size = SII8620_BURST_BUF_LEN;
1962 		sii8620_burst_tx_rbuf_info(ctx, SII8620_BURST_BUF_LEN);
1963 		sii8620_mt_read_devcap(ctx, true);
1964 		sii8620_mt_set_cont(ctx, sii8620_got_xdevcap);
1965 	} else {
1966 		sii8620_write_seq_static(ctx,
1967 			REG_MHL_PLL_CTL2, 0,
1968 			REG_MHL_PLL_CTL2, BIT_MHL_PLL_CTL2_CLKDETECT_EN
1969 		);
1970 	}
1971 
1972 	sii8620_write(ctx, REG_TRXINTH, stat);
1973 }
1974 
1975 static void sii8620_irq_block(struct sii8620 *ctx)
1976 {
1977 	u8 stat = sii8620_readb(ctx, REG_EMSCINTR);
1978 
1979 	if (stat & BIT_EMSCINTR_SPI_DVLD) {
1980 		u8 bstat = sii8620_readb(ctx, REG_SPIBURSTSTAT);
1981 
1982 		if (bstat & BIT_SPIBURSTSTAT_EMSC_NORMAL_MODE)
1983 			sii8620_burst_receive(ctx);
1984 	}
1985 
1986 	sii8620_write(ctx, REG_EMSCINTR, stat);
1987 }
1988 
1989 static void sii8620_irq_ddc(struct sii8620 *ctx)
1990 {
1991 	u8 stat = sii8620_readb(ctx, REG_INTR3);
1992 
1993 	if (stat & BIT_DDC_CMD_DONE) {
1994 		sii8620_write(ctx, REG_INTR3_MASK, 0);
1995 		if (sii8620_is_mhl3(ctx) && !ctx->feature_complete)
1996 			sii8620_mt_set_int(ctx, MHL_INT_REG(RCHANGE),
1997 					   MHL_INT_RC_FEAT_REQ);
1998 		else
1999 			sii8620_enable_hpd(ctx);
2000 	}
2001 	sii8620_write(ctx, REG_INTR3, stat);
2002 }
2003 
2004 /* endian agnostic, non-volatile version of test_bit */
2005 static bool sii8620_test_bit(unsigned int nr, const u8 *addr)
2006 {
2007 	return 1 & (addr[nr / BITS_PER_BYTE] >> (nr % BITS_PER_BYTE));
2008 }
2009 
2010 static irqreturn_t sii8620_irq_thread(int irq, void *data)
2011 {
2012 	static const struct {
2013 		int bit;
2014 		void (*handler)(struct sii8620 *ctx);
2015 	} irq_vec[] = {
2016 		{ BIT_FAST_INTR_STAT_DISC, sii8620_irq_disc },
2017 		{ BIT_FAST_INTR_STAT_G2WB, sii8620_irq_g2wb },
2018 		{ BIT_FAST_INTR_STAT_COC, sii8620_irq_coc },
2019 		{ BIT_FAST_INTR_STAT_TDM, sii8620_irq_tdm },
2020 		{ BIT_FAST_INTR_STAT_MSC, sii8620_irq_msc },
2021 		{ BIT_FAST_INTR_STAT_MERR, sii8620_irq_merr },
2022 		{ BIT_FAST_INTR_STAT_BLOCK, sii8620_irq_block },
2023 		{ BIT_FAST_INTR_STAT_EDID, sii8620_irq_edid },
2024 		{ BIT_FAST_INTR_STAT_DDC, sii8620_irq_ddc },
2025 		{ BIT_FAST_INTR_STAT_SCDT, sii8620_irq_scdt },
2026 	};
2027 	struct sii8620 *ctx = data;
2028 	u8 stats[LEN_FAST_INTR_STAT];
2029 	int i, ret;
2030 
2031 	mutex_lock(&ctx->lock);
2032 
2033 	sii8620_read_buf(ctx, REG_FAST_INTR_STAT, stats, ARRAY_SIZE(stats));
2034 	for (i = 0; i < ARRAY_SIZE(irq_vec); ++i)
2035 		if (sii8620_test_bit(irq_vec[i].bit, stats))
2036 			irq_vec[i].handler(ctx);
2037 
2038 	sii8620_burst_rx_all(ctx);
2039 	sii8620_mt_work(ctx);
2040 	sii8620_burst_send(ctx);
2041 
2042 	ret = sii8620_clear_error(ctx);
2043 	if (ret) {
2044 		dev_err(ctx->dev, "Error during IRQ handling, %d.\n", ret);
2045 		sii8620_mhl_disconnected(ctx);
2046 	}
2047 	mutex_unlock(&ctx->lock);
2048 
2049 	return IRQ_HANDLED;
2050 }
2051 
2052 static void sii8620_cable_in(struct sii8620 *ctx)
2053 {
2054 	struct device *dev = ctx->dev;
2055 	u8 ver[5];
2056 	int ret;
2057 
2058 	ret = sii8620_hw_on(ctx);
2059 	if (ret) {
2060 		dev_err(dev, "Error powering on, %d.\n", ret);
2061 		return;
2062 	}
2063 
2064 	sii8620_read_buf(ctx, REG_VND_IDL, ver, ARRAY_SIZE(ver));
2065 	ret = sii8620_clear_error(ctx);
2066 	if (ret) {
2067 		dev_err(dev, "Error accessing I2C bus, %d.\n", ret);
2068 		return;
2069 	}
2070 
2071 	dev_info(dev, "ChipID %02x%02x:%02x%02x rev %02x.\n", ver[1], ver[0],
2072 		 ver[3], ver[2], ver[4]);
2073 
2074 	sii8620_write(ctx, REG_DPD,
2075 		      BIT_DPD_PWRON_PLL | BIT_DPD_PDNTX12 | BIT_DPD_OSC_EN);
2076 
2077 	sii8620_xtal_set_rate(ctx);
2078 	sii8620_disconnect(ctx);
2079 
2080 	sii8620_write_seq_static(ctx,
2081 		REG_MHL_CBUS_CTL0, VAL_MHL_CBUS_CTL0_CBUS_DRV_SEL_STRONG
2082 			| VAL_MHL_CBUS_CTL0_CBUS_RGND_VBIAS_734,
2083 		REG_MHL_CBUS_CTL1, VAL_MHL_CBUS_CTL1_1115_OHM,
2084 		REG_DPD, BIT_DPD_PWRON_PLL | BIT_DPD_PDNTX12 | BIT_DPD_OSC_EN,
2085 	);
2086 
2087 	ret = sii8620_clear_error(ctx);
2088 	if (ret) {
2089 		dev_err(dev, "Error accessing I2C bus, %d.\n", ret);
2090 		return;
2091 	}
2092 
2093 	enable_irq(to_i2c_client(ctx->dev)->irq);
2094 }
2095 
2096 static void sii8620_init_rcp_input_dev(struct sii8620 *ctx)
2097 {
2098 	struct rc_dev *rc_dev;
2099 	int ret;
2100 
2101 	if (!IS_ENABLED(CONFIG_RC_CORE))
2102 		return;
2103 
2104 	rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
2105 	if (!rc_dev) {
2106 		dev_err(ctx->dev, "Failed to allocate RC device\n");
2107 		ctx->error = -ENOMEM;
2108 		return;
2109 	}
2110 
2111 	rc_dev->input_phys = "sii8620/input0";
2112 	rc_dev->input_id.bustype = BUS_VIRTUAL;
2113 	rc_dev->map_name = RC_MAP_CEC;
2114 	rc_dev->allowed_protocols = RC_PROTO_BIT_CEC;
2115 	rc_dev->driver_name = "sii8620";
2116 	rc_dev->device_name = "sii8620";
2117 
2118 	ret = rc_register_device(rc_dev);
2119 
2120 	if (ret) {
2121 		dev_err(ctx->dev, "Failed to register RC device\n");
2122 		ctx->error = ret;
2123 		rc_free_device(ctx->rc_dev);
2124 		return;
2125 	}
2126 	ctx->rc_dev = rc_dev;
2127 }
2128 
2129 static void sii8620_cable_out(struct sii8620 *ctx)
2130 {
2131 	disable_irq(to_i2c_client(ctx->dev)->irq);
2132 	sii8620_hw_off(ctx);
2133 }
2134 
2135 static void sii8620_extcon_work(struct work_struct *work)
2136 {
2137 	struct sii8620 *ctx =
2138 		container_of(work, struct sii8620, extcon_wq);
2139 	int state = extcon_get_state(ctx->extcon, EXTCON_DISP_MHL);
2140 
2141 	if (state == ctx->cable_state)
2142 		return;
2143 
2144 	ctx->cable_state = state;
2145 
2146 	if (state > 0)
2147 		sii8620_cable_in(ctx);
2148 	else
2149 		sii8620_cable_out(ctx);
2150 }
2151 
2152 static int sii8620_extcon_notifier(struct notifier_block *self,
2153 			unsigned long event, void *ptr)
2154 {
2155 	struct sii8620 *ctx =
2156 		container_of(self, struct sii8620, extcon_nb);
2157 
2158 	schedule_work(&ctx->extcon_wq);
2159 
2160 	return NOTIFY_DONE;
2161 }
2162 
2163 static int sii8620_extcon_init(struct sii8620 *ctx)
2164 {
2165 	struct extcon_dev *edev;
2166 	struct device_node *musb, *muic;
2167 	int ret;
2168 
2169 	/* get micro-USB connector node */
2170 	musb = of_graph_get_remote_node(ctx->dev->of_node, 1, -1);
2171 	/* next get micro-USB Interface Controller node */
2172 	muic = of_get_next_parent(musb);
2173 
2174 	if (!muic) {
2175 		dev_info(ctx->dev, "no extcon found, switching to 'always on' mode\n");
2176 		return 0;
2177 	}
2178 
2179 	edev = extcon_find_edev_by_node(muic);
2180 	of_node_put(muic);
2181 	if (IS_ERR(edev)) {
2182 		if (PTR_ERR(edev) == -EPROBE_DEFER)
2183 			return -EPROBE_DEFER;
2184 		dev_err(ctx->dev, "Invalid or missing extcon\n");
2185 		return PTR_ERR(edev);
2186 	}
2187 
2188 	ctx->extcon = edev;
2189 	ctx->extcon_nb.notifier_call = sii8620_extcon_notifier;
2190 	INIT_WORK(&ctx->extcon_wq, sii8620_extcon_work);
2191 	ret = extcon_register_notifier(edev, EXTCON_DISP_MHL, &ctx->extcon_nb);
2192 	if (ret) {
2193 		dev_err(ctx->dev, "failed to register notifier for MHL\n");
2194 		return ret;
2195 	}
2196 
2197 	return 0;
2198 }
2199 
2200 static inline struct sii8620 *bridge_to_sii8620(struct drm_bridge *bridge)
2201 {
2202 	return container_of(bridge, struct sii8620, bridge);
2203 }
2204 
2205 static int sii8620_attach(struct drm_bridge *bridge,
2206 			  enum drm_bridge_attach_flags flags)
2207 {
2208 	struct sii8620 *ctx = bridge_to_sii8620(bridge);
2209 
2210 	sii8620_init_rcp_input_dev(ctx);
2211 
2212 	return sii8620_clear_error(ctx);
2213 }
2214 
2215 static void sii8620_detach(struct drm_bridge *bridge)
2216 {
2217 	struct sii8620 *ctx = bridge_to_sii8620(bridge);
2218 
2219 	if (!IS_ENABLED(CONFIG_RC_CORE))
2220 		return;
2221 
2222 	rc_unregister_device(ctx->rc_dev);
2223 }
2224 
2225 static int sii8620_is_packing_required(struct sii8620 *ctx,
2226 				       const struct drm_display_mode *mode)
2227 {
2228 	int max_pclk, max_pclk_pp_mode;
2229 
2230 	if (sii8620_is_mhl3(ctx)) {
2231 		max_pclk = MHL3_MAX_PCLK;
2232 		max_pclk_pp_mode = MHL3_MAX_PCLK_PP_MODE;
2233 	} else {
2234 		max_pclk = MHL1_MAX_PCLK;
2235 		max_pclk_pp_mode = MHL1_MAX_PCLK_PP_MODE;
2236 	}
2237 
2238 	if (mode->clock < max_pclk)
2239 		return 0;
2240 	else if (mode->clock < max_pclk_pp_mode)
2241 		return 1;
2242 	else
2243 		return -1;
2244 }
2245 
2246 static enum drm_mode_status sii8620_mode_valid(struct drm_bridge *bridge,
2247 					 const struct drm_display_mode *mode)
2248 {
2249 	struct sii8620 *ctx = bridge_to_sii8620(bridge);
2250 	int pack_required = sii8620_is_packing_required(ctx, mode);
2251 	bool can_pack = ctx->devcap[MHL_DCAP_VID_LINK_MODE] &
2252 			MHL_DCAP_VID_LINK_PPIXEL;
2253 
2254 	switch (pack_required) {
2255 	case 0:
2256 		return MODE_OK;
2257 	case 1:
2258 		return (can_pack) ? MODE_OK : MODE_CLOCK_HIGH;
2259 	default:
2260 		return MODE_CLOCK_HIGH;
2261 	}
2262 }
2263 
2264 static bool sii8620_mode_fixup(struct drm_bridge *bridge,
2265 			       const struct drm_display_mode *mode,
2266 			       struct drm_display_mode *adjusted_mode)
2267 {
2268 	struct sii8620 *ctx = bridge_to_sii8620(bridge);
2269 
2270 	mutex_lock(&ctx->lock);
2271 
2272 	ctx->use_packed_pixel = sii8620_is_packing_required(ctx, adjusted_mode);
2273 
2274 	mutex_unlock(&ctx->lock);
2275 
2276 	return true;
2277 }
2278 
2279 static const struct drm_bridge_funcs sii8620_bridge_funcs = {
2280 	.attach = sii8620_attach,
2281 	.detach = sii8620_detach,
2282 	.mode_fixup = sii8620_mode_fixup,
2283 	.mode_valid = sii8620_mode_valid,
2284 };
2285 
2286 static int sii8620_probe(struct i2c_client *client,
2287 			 const struct i2c_device_id *id)
2288 {
2289 	struct device *dev = &client->dev;
2290 	struct sii8620 *ctx;
2291 	int ret;
2292 
2293 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
2294 	if (!ctx)
2295 		return -ENOMEM;
2296 
2297 	ctx->dev = dev;
2298 	mutex_init(&ctx->lock);
2299 	INIT_LIST_HEAD(&ctx->mt_queue);
2300 
2301 	ctx->clk_xtal = devm_clk_get(dev, "xtal");
2302 	if (IS_ERR(ctx->clk_xtal)) {
2303 		dev_err(dev, "failed to get xtal clock from DT\n");
2304 		return PTR_ERR(ctx->clk_xtal);
2305 	}
2306 
2307 	if (!client->irq) {
2308 		dev_err(dev, "no irq provided\n");
2309 		return -EINVAL;
2310 	}
2311 	irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
2312 	ret = devm_request_threaded_irq(dev, client->irq, NULL,
2313 					sii8620_irq_thread,
2314 					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
2315 					"sii8620", ctx);
2316 	if (ret < 0) {
2317 		dev_err(dev, "failed to install IRQ handler\n");
2318 		return ret;
2319 	}
2320 
2321 	ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
2322 	if (IS_ERR(ctx->gpio_reset)) {
2323 		dev_err(dev, "failed to get reset gpio from DT\n");
2324 		return PTR_ERR(ctx->gpio_reset);
2325 	}
2326 
2327 	ctx->supplies[0].supply = "cvcc10";
2328 	ctx->supplies[1].supply = "iovcc18";
2329 	ret = devm_regulator_bulk_get(dev, 2, ctx->supplies);
2330 	if (ret)
2331 		return ret;
2332 
2333 	ret = sii8620_extcon_init(ctx);
2334 	if (ret < 0) {
2335 		dev_err(ctx->dev, "failed to initialize EXTCON\n");
2336 		return ret;
2337 	}
2338 
2339 	i2c_set_clientdata(client, ctx);
2340 
2341 	ctx->bridge.funcs = &sii8620_bridge_funcs;
2342 	ctx->bridge.of_node = dev->of_node;
2343 	drm_bridge_add(&ctx->bridge);
2344 
2345 	if (!ctx->extcon)
2346 		sii8620_cable_in(ctx);
2347 
2348 	return 0;
2349 }
2350 
2351 static int sii8620_remove(struct i2c_client *client)
2352 {
2353 	struct sii8620 *ctx = i2c_get_clientdata(client);
2354 
2355 	if (ctx->extcon) {
2356 		extcon_unregister_notifier(ctx->extcon, EXTCON_DISP_MHL,
2357 					   &ctx->extcon_nb);
2358 		flush_work(&ctx->extcon_wq);
2359 		if (ctx->cable_state > 0)
2360 			sii8620_cable_out(ctx);
2361 	} else {
2362 		sii8620_cable_out(ctx);
2363 	}
2364 	drm_bridge_remove(&ctx->bridge);
2365 
2366 	return 0;
2367 }
2368 
2369 static const struct of_device_id sii8620_dt_match[] = {
2370 	{ .compatible = "sil,sii8620" },
2371 	{ },
2372 };
2373 MODULE_DEVICE_TABLE(of, sii8620_dt_match);
2374 
2375 static const struct i2c_device_id sii8620_id[] = {
2376 	{ "sii8620", 0 },
2377 	{ },
2378 };
2379 
2380 MODULE_DEVICE_TABLE(i2c, sii8620_id);
2381 static struct i2c_driver sii8620_driver = {
2382 	.driver = {
2383 		.name	= "sii8620",
2384 		.of_match_table = of_match_ptr(sii8620_dt_match),
2385 	},
2386 	.probe		= sii8620_probe,
2387 	.remove		= sii8620_remove,
2388 	.id_table = sii8620_id,
2389 };
2390 
2391 module_i2c_driver(sii8620_driver);
2392 MODULE_LICENSE("GPL v2");
2393