1 /*
2  * Copyright 2012-15 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: AMD
23  *
24  */
25 
26 #include "dm_services.h"
27 #include "core_types.h"
28 #include "dce_aux.h"
29 #include "dce/dce_11_0_sh_mask.h"
30 #include "dm_event_log.h"
31 #include "dm_helpers.h"
32 #include "dmub/inc/dmub_cmd.h"
33 
34 #define CTX \
35 	aux110->base.ctx
36 #define REG(reg_name)\
37 	(aux110->regs->reg_name)
38 
39 #define DC_LOGGER \
40 	engine->ctx->logger
41 
42 #define DC_TRACE_LEVEL_MESSAGE(...) do { } while (0)
43 #define IS_DC_I2CAUX_LOGGING_ENABLED() (false)
44 #define LOG_FLAG_Error_I2cAux LOG_ERROR
45 #define LOG_FLAG_I2cAux_DceAux LOG_I2C_AUX
46 
47 #include "reg_helper.h"
48 
49 #undef FN
50 #define FN(reg_name, field_name) \
51 	aux110->shift->field_name, aux110->mask->field_name
52 
53 #define FROM_AUX_ENGINE(ptr) \
54 	container_of((ptr), struct aux_engine_dce110, base)
55 
56 #define FROM_ENGINE(ptr) \
57 	FROM_AUX_ENGINE(container_of((ptr), struct dce_aux, base))
58 
59 #define FROM_AUX_ENGINE_ENGINE(ptr) \
60 	container_of((ptr), struct dce_aux, base)
61 enum {
62 	AUX_INVALID_REPLY_RETRY_COUNTER = 1,
63 	AUX_TIMED_OUT_RETRY_COUNTER = 2,
64 	AUX_DEFER_RETRY_COUNTER = 6
65 };
66 
67 #define TIME_OUT_INCREMENT        1016
68 #define TIME_OUT_MULTIPLIER_8     8
69 #define TIME_OUT_MULTIPLIER_16    16
70 #define TIME_OUT_MULTIPLIER_32    32
71 #define TIME_OUT_MULTIPLIER_64    64
72 #define MAX_TIMEOUT_LENGTH        127
73 #define DEFAULT_AUX_ENGINE_MULT   0
74 #define DEFAULT_AUX_ENGINE_LENGTH 69
75 
76 #define DC_TRACE_LEVEL_MESSAGE(...) do { } while (0)
77 
78 static void release_engine(
79 	struct dce_aux *engine)
80 {
81 	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
82 
83 	dal_ddc_close(engine->ddc);
84 
85 	engine->ddc = NULL;
86 
87 	REG_UPDATE_2(AUX_ARB_CONTROL, AUX_SW_DONE_USING_AUX_REG, 1,
88 		AUX_SW_USE_AUX_REG_REQ, 0);
89 }
90 
91 #define SW_CAN_ACCESS_AUX 1
92 #define DMCU_CAN_ACCESS_AUX 2
93 
94 static bool is_engine_available(
95 	struct dce_aux *engine)
96 {
97 	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
98 
99 	uint32_t value = REG_READ(AUX_ARB_CONTROL);
100 	uint32_t field = get_reg_field_value(
101 			value,
102 			AUX_ARB_CONTROL,
103 			AUX_REG_RW_CNTL_STATUS);
104 
105 	return (field != DMCU_CAN_ACCESS_AUX);
106 }
107 static bool acquire_engine(
108 	struct dce_aux *engine)
109 {
110 	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
111 
112 	uint32_t value = REG_READ(AUX_ARB_CONTROL);
113 	uint32_t field = get_reg_field_value(
114 			value,
115 			AUX_ARB_CONTROL,
116 			AUX_REG_RW_CNTL_STATUS);
117 	if (field == DMCU_CAN_ACCESS_AUX)
118 		return false;
119 	/* enable AUX before request SW to access AUX */
120 	value = REG_READ(AUX_CONTROL);
121 	field = get_reg_field_value(value,
122 				AUX_CONTROL,
123 				AUX_EN);
124 
125 	if (field == 0) {
126 		set_reg_field_value(
127 				value,
128 				1,
129 				AUX_CONTROL,
130 				AUX_EN);
131 
132 		if (REG(AUX_RESET_MASK)) {
133 			/*DP_AUX block as part of the enable sequence*/
134 			set_reg_field_value(
135 				value,
136 				1,
137 				AUX_CONTROL,
138 				AUX_RESET);
139 		}
140 
141 		REG_WRITE(AUX_CONTROL, value);
142 
143 		if (REG(AUX_RESET_MASK)) {
144 			/*poll HW to make sure reset it done*/
145 
146 			REG_WAIT(AUX_CONTROL, AUX_RESET_DONE, 1,
147 					1, 11);
148 
149 			set_reg_field_value(
150 				value,
151 				0,
152 				AUX_CONTROL,
153 				AUX_RESET);
154 
155 			REG_WRITE(AUX_CONTROL, value);
156 
157 			REG_WAIT(AUX_CONTROL, AUX_RESET_DONE, 0,
158 					1, 11);
159 		}
160 	} /*if (field)*/
161 
162 	/* request SW to access AUX */
163 	REG_UPDATE(AUX_ARB_CONTROL, AUX_SW_USE_AUX_REG_REQ, 1);
164 
165 	value = REG_READ(AUX_ARB_CONTROL);
166 	field = get_reg_field_value(
167 			value,
168 			AUX_ARB_CONTROL,
169 			AUX_REG_RW_CNTL_STATUS);
170 
171 	return (field == SW_CAN_ACCESS_AUX);
172 }
173 
174 #define COMPOSE_AUX_SW_DATA_16_20(command, address) \
175 	((command) | ((0xF0000 & (address)) >> 16))
176 
177 #define COMPOSE_AUX_SW_DATA_8_15(address) \
178 	((0xFF00 & (address)) >> 8)
179 
180 #define COMPOSE_AUX_SW_DATA_0_7(address) \
181 	(0xFF & (address))
182 
183 static void submit_channel_request(
184 	struct dce_aux *engine,
185 	struct aux_request_transaction_data *request)
186 {
187 	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
188 	uint32_t value;
189 	uint32_t length;
190 
191 	bool is_write =
192 		((request->type == AUX_TRANSACTION_TYPE_DP) &&
193 		 (request->action == I2CAUX_TRANSACTION_ACTION_DP_WRITE)) ||
194 		((request->type == AUX_TRANSACTION_TYPE_I2C) &&
195 		((request->action == I2CAUX_TRANSACTION_ACTION_I2C_WRITE) ||
196 		 (request->action == I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT)));
197 	if (REG(AUXN_IMPCAL)) {
198 		/* clear_aux_error */
199 		REG_UPDATE_SEQ_2(AUXN_IMPCAL,
200 				AUXN_CALOUT_ERROR_AK, 1,
201 				AUXN_CALOUT_ERROR_AK, 0);
202 
203 		REG_UPDATE_SEQ_2(AUXP_IMPCAL,
204 				AUXP_CALOUT_ERROR_AK, 1,
205 				AUXP_CALOUT_ERROR_AK, 0);
206 
207 		/* force_default_calibrate */
208 		REG_UPDATE_SEQ_2(AUXN_IMPCAL,
209 				AUXN_IMPCAL_ENABLE, 1,
210 				AUXN_IMPCAL_OVERRIDE_ENABLE, 0);
211 
212 		/* bug? why AUXN update EN and OVERRIDE_EN 1 by 1 while AUX P toggles OVERRIDE? */
213 
214 		REG_UPDATE_SEQ_2(AUXP_IMPCAL,
215 				AUXP_IMPCAL_OVERRIDE_ENABLE, 1,
216 				AUXP_IMPCAL_OVERRIDE_ENABLE, 0);
217 	}
218 
219 	REG_UPDATE(AUX_INTERRUPT_CONTROL, AUX_SW_DONE_ACK, 1);
220 
221 	REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 0,
222 				10, aux110->polling_timeout_period/10);
223 
224 	/* set the delay and the number of bytes to write */
225 
226 	/* The length include
227 	 * the 4 bit header and the 20 bit address
228 	 * (that is 3 byte).
229 	 * If the requested length is non zero this means
230 	 * an addition byte specifying the length is required.
231 	 */
232 
233 	length = request->length ? 4 : 3;
234 	if (is_write)
235 		length += request->length;
236 
237 	REG_UPDATE_2(AUX_SW_CONTROL,
238 			AUX_SW_START_DELAY, request->delay,
239 			AUX_SW_WR_BYTES, length);
240 
241 	/* program action and address and payload data (if 'is_write') */
242 	value = REG_UPDATE_4(AUX_SW_DATA,
243 			AUX_SW_INDEX, 0,
244 			AUX_SW_DATA_RW, 0,
245 			AUX_SW_AUTOINCREMENT_DISABLE, 1,
246 			AUX_SW_DATA, COMPOSE_AUX_SW_DATA_16_20(request->action, request->address));
247 
248 	value = REG_SET_2(AUX_SW_DATA, value,
249 			AUX_SW_AUTOINCREMENT_DISABLE, 0,
250 			AUX_SW_DATA, COMPOSE_AUX_SW_DATA_8_15(request->address));
251 
252 	value = REG_SET(AUX_SW_DATA, value,
253 			AUX_SW_DATA, COMPOSE_AUX_SW_DATA_0_7(request->address));
254 
255 	if (request->length) {
256 		value = REG_SET(AUX_SW_DATA, value,
257 				AUX_SW_DATA, request->length - 1);
258 	}
259 
260 	if (is_write) {
261 		/* Load the HW buffer with the Data to be sent.
262 		 * This is relevant for write operation.
263 		 * For read, the data recived data will be
264 		 * processed in process_channel_reply().
265 		 */
266 		uint32_t i = 0;
267 
268 		while (i < request->length) {
269 			value = REG_SET(AUX_SW_DATA, value,
270 					AUX_SW_DATA, request->data[i]);
271 
272 			++i;
273 		}
274 	}
275 
276 	REG_UPDATE(AUX_SW_CONTROL, AUX_SW_GO, 1);
277 	EVENT_LOG_AUX_REQ(engine->ddc->pin_data->en, EVENT_LOG_AUX_ORIGIN_NATIVE,
278 					request->action, request->address, request->length, request->data);
279 }
280 
281 static int read_channel_reply(struct dce_aux *engine, uint32_t size,
282 			      uint8_t *buffer, uint8_t *reply_result,
283 			      uint32_t *sw_status)
284 {
285 	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
286 	uint32_t bytes_replied;
287 	uint32_t reply_result_32;
288 
289 	*sw_status = REG_GET(AUX_SW_STATUS, AUX_SW_REPLY_BYTE_COUNT,
290 			     &bytes_replied);
291 
292 	/* In case HPD is LOW, exit AUX transaction */
293 	if ((*sw_status & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK))
294 		return -1;
295 
296 	/* Need at least the status byte */
297 	if (!bytes_replied)
298 		return -1;
299 
300 	REG_UPDATE_SEQ_3(AUX_SW_DATA,
301 			  AUX_SW_INDEX, 0,
302 			  AUX_SW_AUTOINCREMENT_DISABLE, 1,
303 			  AUX_SW_DATA_RW, 1);
304 
305 	REG_GET(AUX_SW_DATA, AUX_SW_DATA, &reply_result_32);
306 	reply_result_32 = reply_result_32 >> 4;
307 	if (reply_result != NULL)
308 		*reply_result = (uint8_t)reply_result_32;
309 
310 	if (reply_result_32 == 0) { /* ACK */
311 		uint32_t i = 0;
312 
313 		/* First byte was already used to get the command status */
314 		--bytes_replied;
315 
316 		/* Do not overflow buffer */
317 		if (bytes_replied > size)
318 			return -1;
319 
320 		while (i < bytes_replied) {
321 			uint32_t aux_sw_data_val;
322 
323 			REG_GET(AUX_SW_DATA, AUX_SW_DATA, &aux_sw_data_val);
324 			buffer[i] = aux_sw_data_val;
325 			++i;
326 		}
327 
328 		return i;
329 	}
330 
331 	return 0;
332 }
333 
334 static enum aux_return_code_type get_channel_status(
335 	struct dce_aux *engine,
336 	uint8_t *returned_bytes)
337 {
338 	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
339 
340 	uint32_t value;
341 
342 	if (returned_bytes == NULL) {
343 		/*caller pass NULL pointer*/
344 		ASSERT_CRITICAL(false);
345 		return AUX_RET_ERROR_UNKNOWN;
346 	}
347 	*returned_bytes = 0;
348 
349 	/* poll to make sure that SW_DONE is asserted */
350 	REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 1,
351 				10, aux110->polling_timeout_period/10);
352 
353 	value = REG_READ(AUX_SW_STATUS);
354 	/* in case HPD is LOW, exit AUX transaction */
355 	if ((value & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK))
356 		return AUX_RET_ERROR_HPD_DISCON;
357 
358 	/* Note that the following bits are set in 'status.bits'
359 	 * during CTS 4.2.1.2 (FW 3.3.1):
360 	 * AUX_SW_RX_MIN_COUNT_VIOL, AUX_SW_RX_INVALID_STOP,
361 	 * AUX_SW_RX_RECV_NO_DET, AUX_SW_RX_RECV_INVALID_H.
362 	 *
363 	 * AUX_SW_RX_MIN_COUNT_VIOL is an internal,
364 	 * HW debugging bit and should be ignored.
365 	 */
366 	if (value & AUX_SW_STATUS__AUX_SW_DONE_MASK) {
367 		if ((value & AUX_SW_STATUS__AUX_SW_RX_TIMEOUT_STATE_MASK) ||
368 			(value & AUX_SW_STATUS__AUX_SW_RX_TIMEOUT_MASK))
369 			return AUX_RET_ERROR_TIMEOUT;
370 
371 		else if ((value & AUX_SW_STATUS__AUX_SW_RX_INVALID_STOP_MASK) ||
372 			(value & AUX_SW_STATUS__AUX_SW_RX_RECV_NO_DET_MASK) ||
373 			(value &
374 				AUX_SW_STATUS__AUX_SW_RX_RECV_INVALID_H_MASK) ||
375 			(value & AUX_SW_STATUS__AUX_SW_RX_RECV_INVALID_L_MASK))
376 			return AUX_RET_ERROR_INVALID_REPLY;
377 
378 		*returned_bytes = get_reg_field_value(value,
379 				AUX_SW_STATUS,
380 				AUX_SW_REPLY_BYTE_COUNT);
381 
382 		if (*returned_bytes == 0)
383 			return
384 			AUX_RET_ERROR_INVALID_REPLY;
385 		else {
386 			*returned_bytes -= 1;
387 			return AUX_RET_SUCCESS;
388 		}
389 	} else {
390 		/*time_elapsed >= aux_engine->timeout_period
391 		 *  AUX_SW_STATUS__AUX_SW_HPD_DISCON = at this point
392 		 */
393 		ASSERT_CRITICAL(false);
394 		return AUX_RET_ERROR_TIMEOUT;
395 	}
396 }
397 
398 static bool acquire(
399 	struct dce_aux *engine,
400 	struct ddc *ddc)
401 {
402 	enum gpio_result result;
403 
404 	if ((engine == NULL) || !is_engine_available(engine))
405 		return false;
406 
407 	result = dal_ddc_open(ddc, GPIO_MODE_HARDWARE,
408 		GPIO_DDC_CONFIG_TYPE_MODE_AUX);
409 
410 	if (result != GPIO_RESULT_OK)
411 		return false;
412 
413 	if (!acquire_engine(engine)) {
414 		engine->ddc = ddc;
415 		release_engine(engine);
416 		return false;
417 	}
418 
419 	engine->ddc = ddc;
420 
421 	return true;
422 }
423 
424 void dce110_engine_destroy(struct dce_aux **engine)
425 {
426 
427 	struct aux_engine_dce110 *engine110 = FROM_AUX_ENGINE(*engine);
428 
429 	kfree(engine110);
430 	*engine = NULL;
431 
432 }
433 
434 static uint32_t dce_aux_configure_timeout(struct ddc_service *ddc,
435 		uint32_t timeout_in_us)
436 {
437 	uint32_t multiplier = 0;
438 	uint32_t length = 0;
439 	uint32_t prev_length = 0;
440 	uint32_t prev_mult = 0;
441 	uint32_t prev_timeout_val = 0;
442 	struct ddc *ddc_pin = ddc->ddc_pin;
443 	struct dce_aux *aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
444 	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(aux_engine);
445 
446 	/* 1-Update polling timeout period */
447 	aux110->polling_timeout_period = timeout_in_us * SW_AUX_TIMEOUT_PERIOD_MULTIPLIER;
448 
449 	/* 2-Update aux timeout period length and multiplier */
450 	if (timeout_in_us == 0) {
451 		multiplier = DEFAULT_AUX_ENGINE_MULT;
452 		length = DEFAULT_AUX_ENGINE_LENGTH;
453 	} else if (timeout_in_us <= TIME_OUT_INCREMENT) {
454 		multiplier = 0;
455 		length = timeout_in_us/TIME_OUT_MULTIPLIER_8;
456 		if (timeout_in_us % TIME_OUT_MULTIPLIER_8 != 0)
457 			length++;
458 	} else if (timeout_in_us <= 2 * TIME_OUT_INCREMENT) {
459 		multiplier = 1;
460 		length = timeout_in_us/TIME_OUT_MULTIPLIER_16;
461 		if (timeout_in_us % TIME_OUT_MULTIPLIER_16 != 0)
462 			length++;
463 	} else if (timeout_in_us <= 4 * TIME_OUT_INCREMENT) {
464 		multiplier = 2;
465 		length = timeout_in_us/TIME_OUT_MULTIPLIER_32;
466 		if (timeout_in_us % TIME_OUT_MULTIPLIER_32 != 0)
467 			length++;
468 	} else if (timeout_in_us > 4 * TIME_OUT_INCREMENT) {
469 		multiplier = 3;
470 		length = timeout_in_us/TIME_OUT_MULTIPLIER_64;
471 		if (timeout_in_us % TIME_OUT_MULTIPLIER_64 != 0)
472 			length++;
473 	}
474 
475 	length = (length < MAX_TIMEOUT_LENGTH) ? length : MAX_TIMEOUT_LENGTH;
476 
477 	REG_GET_2(AUX_DPHY_RX_CONTROL1, AUX_RX_TIMEOUT_LEN, &prev_length, AUX_RX_TIMEOUT_LEN_MUL, &prev_mult);
478 
479 	switch (prev_mult) {
480 	case 0:
481 		prev_timeout_val = prev_length * TIME_OUT_MULTIPLIER_8;
482 		break;
483 	case 1:
484 		prev_timeout_val = prev_length * TIME_OUT_MULTIPLIER_16;
485 		break;
486 	case 2:
487 		prev_timeout_val = prev_length * TIME_OUT_MULTIPLIER_32;
488 		break;
489 	case 3:
490 		prev_timeout_val = prev_length * TIME_OUT_MULTIPLIER_64;
491 		break;
492 	default:
493 		prev_timeout_val = DEFAULT_AUX_ENGINE_LENGTH * TIME_OUT_MULTIPLIER_8;
494 		break;
495 	}
496 
497 	REG_UPDATE_SEQ_2(AUX_DPHY_RX_CONTROL1, AUX_RX_TIMEOUT_LEN, length, AUX_RX_TIMEOUT_LEN_MUL, multiplier);
498 
499 	return prev_timeout_val;
500 }
501 
502 static struct dce_aux_funcs aux_functions = {
503 	.configure_timeout = NULL,
504 	.destroy = NULL,
505 };
506 
507 struct dce_aux *dce110_aux_engine_construct(struct aux_engine_dce110 *aux_engine110,
508 		struct dc_context *ctx,
509 		uint32_t inst,
510 		uint32_t timeout_period,
511 		const struct dce110_aux_registers *regs,
512 		const struct dce110_aux_registers_mask *mask,
513 		const struct dce110_aux_registers_shift *shift,
514 		bool is_ext_aux_timeout_configurable)
515 {
516 	aux_engine110->base.ddc = NULL;
517 	aux_engine110->base.ctx = ctx;
518 	aux_engine110->base.delay = 0;
519 	aux_engine110->base.max_defer_write_retry = 0;
520 	aux_engine110->base.inst = inst;
521 	aux_engine110->polling_timeout_period = timeout_period;
522 	aux_engine110->regs = regs;
523 
524 	aux_engine110->mask = mask;
525 	aux_engine110->shift = shift;
526 	aux_engine110->base.funcs = &aux_functions;
527 	if (is_ext_aux_timeout_configurable)
528 		aux_engine110->base.funcs->configure_timeout = &dce_aux_configure_timeout;
529 
530 	return &aux_engine110->base;
531 }
532 
533 static enum i2caux_transaction_action i2caux_action_from_payload(struct aux_payload *payload)
534 {
535 	if (payload->i2c_over_aux) {
536 		if (payload->write_status_update) {
537 			if (payload->mot)
538 				return I2CAUX_TRANSACTION_ACTION_I2C_STATUS_REQUEST_MOT;
539 			else
540 				return I2CAUX_TRANSACTION_ACTION_I2C_STATUS_REQUEST;
541 		}
542 		if (payload->write) {
543 			if (payload->mot)
544 				return I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT;
545 			else
546 				return I2CAUX_TRANSACTION_ACTION_I2C_WRITE;
547 		}
548 		if (payload->mot)
549 			return I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT;
550 
551 		return I2CAUX_TRANSACTION_ACTION_I2C_READ;
552 	}
553 	if (payload->write)
554 		return I2CAUX_TRANSACTION_ACTION_DP_WRITE;
555 
556 	return I2CAUX_TRANSACTION_ACTION_DP_READ;
557 }
558 
559 int dce_aux_transfer_raw(struct ddc_service *ddc,
560 		struct aux_payload *payload,
561 		enum aux_return_code_type *operation_result)
562 {
563 	struct ddc *ddc_pin = ddc->ddc_pin;
564 	struct dce_aux *aux_engine;
565 	struct aux_request_transaction_data aux_req;
566 	uint8_t returned_bytes = 0;
567 	int res = -1;
568 	uint32_t status;
569 
570 	memset(&aux_req, 0, sizeof(aux_req));
571 
572 	if (ddc_pin == NULL) {
573 		*operation_result = AUX_RET_ERROR_ENGINE_ACQUIRE;
574 		return -1;
575 	}
576 
577 	aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
578 	if (!acquire(aux_engine, ddc_pin)) {
579 		*operation_result = AUX_RET_ERROR_ENGINE_ACQUIRE;
580 		return -1;
581 	}
582 
583 	if (payload->i2c_over_aux)
584 		aux_req.type = AUX_TRANSACTION_TYPE_I2C;
585 	else
586 		aux_req.type = AUX_TRANSACTION_TYPE_DP;
587 
588 	aux_req.action = i2caux_action_from_payload(payload);
589 
590 	aux_req.address = payload->address;
591 	aux_req.delay = 0;
592 	aux_req.length = payload->length;
593 	aux_req.data = payload->data;
594 
595 	submit_channel_request(aux_engine, &aux_req);
596 	*operation_result = get_channel_status(aux_engine, &returned_bytes);
597 
598 	if (*operation_result == AUX_RET_SUCCESS) {
599 		int __maybe_unused bytes_replied = 0;
600 
601 		bytes_replied = read_channel_reply(aux_engine, payload->length,
602 					 payload->data, payload->reply,
603 					 &status);
604 		EVENT_LOG_AUX_REP(aux_engine->ddc->pin_data->en,
605 					EVENT_LOG_AUX_ORIGIN_NATIVE, *payload->reply,
606 					bytes_replied, payload->data);
607 		res = returned_bytes;
608 	} else {
609 		res = -1;
610 	}
611 
612 	release_engine(aux_engine);
613 	return res;
614 }
615 
616 int dce_aux_transfer_dmub_raw(struct ddc_service *ddc,
617 		struct aux_payload *payload,
618 		enum aux_return_code_type *operation_result)
619 {
620 	struct ddc *ddc_pin = ddc->ddc_pin;
621 
622 	if (ddc_pin != NULL) {
623 		struct dce_aux *aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
624 		/* XXX: Workaround to configure ddc channels for aux transactions */
625 		if (!acquire(aux_engine, ddc_pin)) {
626 			*operation_result = AUX_RET_ERROR_ENGINE_ACQUIRE;
627 			return -1;
628 		}
629 		release_engine(aux_engine);
630 	}
631 
632 	return dm_helper_dmub_aux_transfer_sync(ddc->ctx, ddc->link, payload, operation_result);
633 }
634 
635 #define AUX_MAX_RETRIES 7
636 #define AUX_MIN_DEFER_RETRIES 7
637 #define AUX_MAX_DEFER_TIMEOUT_MS 50
638 #define AUX_MAX_I2C_DEFER_RETRIES 7
639 #define AUX_MAX_INVALID_REPLY_RETRIES 2
640 #define AUX_MAX_TIMEOUT_RETRIES 3
641 #define AUX_DEFER_DELAY_FOR_DPIA 4 /*ms*/
642 
643 static void dce_aux_log_payload(const char *payload_name,
644 	unsigned char *payload, uint32_t length, uint32_t max_length_to_log)
645 {
646 	if (!IS_DC_I2CAUX_LOGGING_ENABLED())
647 		return;
648 
649 	if (payload && length) {
650 		char hex_str[128] = {0};
651 		char *hex_str_ptr = &hex_str[0];
652 		uint32_t hex_str_remaining = sizeof(hex_str);
653 		unsigned char *payload_ptr = payload;
654 		unsigned char *payload_max_to_log_ptr = payload_ptr + min(max_length_to_log, length);
655 		unsigned int count;
656 		char *padding = "";
657 
658 		while (payload_ptr < payload_max_to_log_ptr) {
659 			count = snprintf_count(hex_str_ptr, hex_str_remaining, "%s%02X", padding, *payload_ptr);
660 			padding = " ";
661 			hex_str_remaining -= count;
662 			hex_str_ptr += count;
663 			payload_ptr++;
664 		}
665 
666 		count = snprintf_count(hex_str_ptr, hex_str_remaining, "   ");
667 		hex_str_remaining -= count;
668 		hex_str_ptr += count;
669 
670 		payload_ptr = payload;
671 		while (payload_ptr < payload_max_to_log_ptr) {
672 			count = snprintf_count(hex_str_ptr, hex_str_remaining, "%c",
673 				*payload_ptr >= ' ' ? *payload_ptr : '.');
674 			hex_str_remaining -= count;
675 			hex_str_ptr += count;
676 			payload_ptr++;
677 		}
678 
679 		DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_VERBOSE,
680 					LOG_FLAG_I2cAux_DceAux,
681 					"dce_aux_log_payload: %s: length=%u: data: %s%s",
682 					payload_name,
683 					length,
684 					hex_str,
685 					(length > max_length_to_log ? " (...)" : " "));
686 	} else {
687 		DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_VERBOSE,
688 					LOG_FLAG_I2cAux_DceAux,
689 					"dce_aux_log_payload: %s: length=%u: data: <empty payload>",
690 					payload_name,
691 					length);
692 	}
693 }
694 
695 bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
696 		struct aux_payload *payload)
697 {
698 	int i, ret = 0;
699 	uint8_t reply;
700 	bool payload_reply = true;
701 	enum aux_return_code_type operation_result;
702 	bool retry_on_defer = false;
703 	struct ddc *ddc_pin = ddc->ddc_pin;
704 	struct dce_aux *aux_engine = NULL;
705 	struct aux_engine_dce110 *aux110 = NULL;
706 	uint32_t defer_time_in_ms = 0;
707 
708 	int aux_ack_retries = 0,
709 		aux_defer_retries = 0,
710 		aux_i2c_defer_retries = 0,
711 		aux_timeout_retries = 0,
712 		aux_invalid_reply_retries = 0,
713 		aux_ack_m_retries = 0;
714 
715 	if (ddc_pin) {
716 		aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
717 		aux110 = FROM_AUX_ENGINE(aux_engine);
718 	}
719 
720 	if (!payload->reply) {
721 		payload_reply = false;
722 		payload->reply = &reply;
723 	}
724 
725 	for (i = 0; i < AUX_MAX_RETRIES; i++) {
726 		DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
727 					LOG_FLAG_I2cAux_DceAux,
728 					"dce_aux_transfer_with_retries: link_index=%u: START: retry %d of %d: address=0x%04x length=%u write=%d mot=%d",
729 					ddc && ddc->link ? ddc->link->link_index : UINT_MAX,
730 					i + 1,
731 					(int)AUX_MAX_RETRIES,
732 					payload->address,
733 					payload->length,
734 					(unsigned int) payload->write,
735 					(unsigned int) payload->mot);
736 		if (payload->write)
737 			dce_aux_log_payload("  write", payload->data, payload->length, 16);
738 		ret = dce_aux_transfer_raw(ddc, payload, &operation_result);
739 		DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
740 					LOG_FLAG_I2cAux_DceAux,
741 					"dce_aux_transfer_with_retries: link_index=%u: END: retry %d of %d: address=0x%04x length=%u write=%d mot=%d: ret=%d operation_result=%d payload->reply=%u",
742 					ddc && ddc->link ? ddc->link->link_index : UINT_MAX,
743 					i + 1,
744 					(int)AUX_MAX_RETRIES,
745 					payload->address,
746 					payload->length,
747 					(unsigned int) payload->write,
748 					(unsigned int) payload->mot,
749 					ret,
750 					(int)operation_result,
751 					(unsigned int) *payload->reply);
752 		if (!payload->write)
753 			dce_aux_log_payload("  read", payload->data, ret > 0 ? ret : 0, 16);
754 
755 		switch (operation_result) {
756 		case AUX_RET_SUCCESS:
757 			aux_timeout_retries = 0;
758 			aux_invalid_reply_retries = 0;
759 
760 			switch (*payload->reply) {
761 			case AUX_TRANSACTION_REPLY_AUX_ACK:
762 				DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
763 							LOG_FLAG_I2cAux_DceAux,
764 							"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_AUX_ACK");
765 				if (!payload->write && payload->length != ret) {
766 					if (++aux_ack_retries >= AUX_MAX_RETRIES) {
767 						DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
768 									LOG_FLAG_Error_I2cAux,
769 									"dce_aux_transfer_with_retries: FAILURE: aux_ack_retries=%d >= AUX_MAX_RETRIES=%d",
770 									aux_defer_retries,
771 									AUX_MAX_RETRIES);
772 						goto fail;
773 					} else
774 						udelay(300);
775 				} else if (payload->write && ret > 0) {
776 					/* sink requested more time to complete the write via AUX_ACKM */
777 					if (++aux_ack_m_retries >= AUX_MAX_RETRIES) {
778 						DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
779 								LOG_FLAG_Error_I2cAux,
780 								"dce_aux_transfer_with_retries: FAILURE: aux_ack_m_retries=%d >= AUX_MAX_RETRIES=%d",
781 								aux_ack_m_retries,
782 								AUX_MAX_RETRIES);
783 						goto fail;
784 					}
785 
786 					/* retry reading the write status until complete
787 					 * NOTE: payload is modified here
788 					 */
789 					payload->write = false;
790 					payload->write_status_update = true;
791 					payload->length = 0;
792 					udelay(300);
793 
794 				} else
795 					return true;
796 			break;
797 
798 			case AUX_TRANSACTION_REPLY_AUX_DEFER:
799 				DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
800 							LOG_FLAG_I2cAux_DceAux,
801 							"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_AUX_DEFER");
802 
803 				/* polling_timeout_period is in us */
804 				if (aux110)
805 					defer_time_in_ms += aux110->polling_timeout_period / 1000;
806 				else
807 					defer_time_in_ms += AUX_DEFER_DELAY_FOR_DPIA;
808 				++aux_defer_retries;
809 				fallthrough;
810 			case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER:
811 				if (*payload->reply == AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER)
812 					DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
813 								LOG_FLAG_I2cAux_DceAux,
814 								"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER");
815 
816 				retry_on_defer = true;
817 
818 				if (aux_defer_retries >= AUX_MIN_DEFER_RETRIES
819 						&& defer_time_in_ms >= AUX_MAX_DEFER_TIMEOUT_MS) {
820 					DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
821 								LOG_FLAG_Error_I2cAux,
822 								"dce_aux_transfer_with_retries: FAILURE: aux_defer_retries=%d >= AUX_MIN_DEFER_RETRIES=%d && defer_time_in_ms=%d >= AUX_MAX_DEFER_TIMEOUT_MS=%d",
823 								aux_defer_retries,
824 								AUX_MIN_DEFER_RETRIES,
825 								defer_time_in_ms,
826 								AUX_MAX_DEFER_TIMEOUT_MS);
827 					goto fail;
828 				} else {
829 					if ((*payload->reply == AUX_TRANSACTION_REPLY_AUX_DEFER) ||
830 						(*payload->reply == AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER)) {
831 						DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
832 									LOG_FLAG_I2cAux_DceAux,
833 									"dce_aux_transfer_with_retries: payload->defer_delay=%u",
834 									payload->defer_delay);
835 						fsleep(payload->defer_delay * 1000);
836 						defer_time_in_ms += payload->defer_delay;
837 					}
838 				}
839 				break;
840 			case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK:
841 				DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
842 							LOG_FLAG_I2cAux_DceAux,
843 							"dce_aux_transfer_with_retries: FAILURE: AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK");
844 				goto fail;
845 			case AUX_TRANSACTION_REPLY_I2C_DEFER:
846 				DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
847 							LOG_FLAG_I2cAux_DceAux,
848 							"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_I2C_DEFER");
849 
850 				aux_defer_retries = 0;
851 				if (++aux_i2c_defer_retries >= AUX_MAX_I2C_DEFER_RETRIES) {
852 					DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
853 								LOG_FLAG_Error_I2cAux,
854 								"dce_aux_transfer_with_retries: FAILURE: aux_i2c_defer_retries=%d >= AUX_MAX_I2C_DEFER_RETRIES=%d",
855 								aux_i2c_defer_retries,
856 								AUX_MAX_I2C_DEFER_RETRIES);
857 					goto fail;
858 				}
859 				break;
860 
861 			case AUX_TRANSACTION_REPLY_AUX_NACK:
862 				DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
863 							LOG_FLAG_I2cAux_DceAux,
864 							"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_AUX_NACK");
865 				goto fail;
866 
867 			case AUX_TRANSACTION_REPLY_HPD_DISCON:
868 				DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
869 							LOG_FLAG_I2cAux_DceAux,
870 							"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: AUX_TRANSACTION_REPLY_HPD_DISCON");
871 				goto fail;
872 
873 			default:
874 				DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
875 							LOG_FLAG_Error_I2cAux,
876 							"dce_aux_transfer_with_retries: AUX_RET_SUCCESS: FAILURE: AUX_TRANSACTION_REPLY_* unknown, default case. Reply: %d", *payload->reply);
877 				goto fail;
878 			}
879 			break;
880 
881 		case AUX_RET_ERROR_INVALID_REPLY:
882 			DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
883 						LOG_FLAG_I2cAux_DceAux,
884 						"dce_aux_transfer_with_retries: AUX_RET_ERROR_INVALID_REPLY");
885 			if (++aux_invalid_reply_retries >= AUX_MAX_INVALID_REPLY_RETRIES) {
886 				DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
887 							LOG_FLAG_Error_I2cAux,
888 							"dce_aux_transfer_with_retries: FAILURE: aux_invalid_reply_retries=%d >= AUX_MAX_INVALID_REPLY_RETRIES=%d",
889 							aux_invalid_reply_retries,
890 							AUX_MAX_INVALID_REPLY_RETRIES);
891 				goto fail;
892 			} else
893 				udelay(400);
894 			break;
895 
896 		case AUX_RET_ERROR_TIMEOUT:
897 			DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
898 						LOG_FLAG_I2cAux_DceAux,
899 						"dce_aux_transfer_with_retries: AUX_RET_ERROR_TIMEOUT");
900 			// Check whether a DEFER had occurred before the timeout.
901 			// If so, treat timeout as a DEFER.
902 			if (retry_on_defer) {
903 				if (++aux_defer_retries >= AUX_MIN_DEFER_RETRIES) {
904 					DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
905 								LOG_FLAG_Error_I2cAux,
906 								"dce_aux_transfer_with_retries: FAILURE: aux_defer_retries=%d >= AUX_MIN_DEFER_RETRIES=%d",
907 								aux_defer_retries,
908 								AUX_MIN_DEFER_RETRIES);
909 					goto fail;
910 				} else if (payload->defer_delay > 0) {
911 					DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
912 								LOG_FLAG_I2cAux_DceAux,
913 								"dce_aux_transfer_with_retries: payload->defer_delay=%u",
914 								payload->defer_delay);
915 					msleep(payload->defer_delay);
916 				}
917 			} else {
918 				if (++aux_timeout_retries >= AUX_MAX_TIMEOUT_RETRIES) {
919 					DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
920 								LOG_FLAG_Error_I2cAux,
921 								"dce_aux_transfer_with_retries: FAILURE: aux_timeout_retries=%d >= AUX_MAX_TIMEOUT_RETRIES=%d",
922 								aux_timeout_retries,
923 								AUX_MAX_TIMEOUT_RETRIES);
924 					goto fail;
925 				} else {
926 					/*
927 					 * DP 1.4, 2.8.2:  AUX Transaction Response/Reply Timeouts
928 					 * According to the DP spec there should be 3 retries total
929 					 * with a 400us wait inbetween each. Hardware already waits
930 					 * for 550us therefore no wait is required here.
931 					 */
932 				}
933 			}
934 			break;
935 
936 		case AUX_RET_ERROR_HPD_DISCON:
937 		case AUX_RET_ERROR_ENGINE_ACQUIRE:
938 		case AUX_RET_ERROR_UNKNOWN:
939 		default:
940 			goto fail;
941 		}
942 	}
943 
944 fail:
945 	DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
946 				LOG_FLAG_Error_I2cAux,
947 				"%s: Failure: operation_result=%d",
948 				__func__,
949 				(int)operation_result);
950 	if (!payload_reply)
951 		payload->reply = NULL;
952 
953 	return false;
954 }
955