drm/amd/display: Decouple aux from i2c

[Why]
Aux engine is created from i2caux layer. We want to remove this layer
and use the engine directly.

[How]
Decouple aux engine from i2caux. Move aux engine related code to dce folder and use
dc resource pool to manage the engine. And use the engine functions directly

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

14 files changed, 1549 insertions, 14 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
index 08c9d73b9ab7..4019fe07d291 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
@@ -33,10 +33,8 @@
 #include "include/vector.h"
 #include "core_types.h"
 #include "dc_link_ddc.h"
-#include "i2caux/engine.h"
-#include "i2caux/i2c_engine.h"
-#include "i2caux/aux_engine.h"
-#include "i2caux/i2caux.h"
+#include "engine.h"
+#include "aux_engine.h"
 
 #define AUX_POWER_UP_WA_DELAY 500
 #define I2C_OVER_AUX_DEFER_WA_DELAY 70
@@ -641,9 +639,9 @@ int dc_link_aux_transfer(struct ddc_service *ddc,
 			     enum aux_transaction_type type,
 			     enum i2caux_transaction_action action)
 {
-	struct i2caux *i2caux = ddc->ctx->i2caux;
 	struct ddc *ddc_pin = ddc->ddc_pin;
-	struct aux_engine *engine;
+	struct engine *engine;
+	struct aux_engine *aux_engine;
 	enum aux_channel_operation_result operation_result;
 	struct aux_request_transaction_data aux_req;
 	struct aux_reply_transaction_data aux_rep;
@@ -654,7 +652,8 @@ int dc_link_aux_transfer(struct ddc_service *ddc,
 	memset(&aux_req, 0, sizeof(aux_req));
 	memset(&aux_rep, 0, sizeof(aux_rep));
 
-	engine = i2caux->funcs->acquire_aux_engine(i2caux, ddc_pin);
+	engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
+	aux_engine = engine->funcs->acquire(engine, ddc_pin);
 
 	aux_req.type = type;
 	aux_req.action = action;
@@ -664,15 +663,15 @@ int dc_link_aux_transfer(struct ddc_service *ddc,
 	aux_req.length = size;
 	aux_req.data = buffer;
 
-	engine->funcs->submit_channel_request(engine, &aux_req);
-	operation_result = engine->funcs->get_channel_status(engine, &returned_bytes);
+	aux_engine->funcs->submit_channel_request(aux_engine, &aux_req);
+	operation_result = aux_engine->funcs->get_channel_status(aux_engine, &returned_bytes);
 
 	switch (operation_result) {
 	case AUX_CHANNEL_OPERATION_SUCCEEDED:
 		res = returned_bytes;
 
 		if (res <= size && res >= 0)
-			res = engine->funcs->read_channel_reply(engine, size,
+			res = aux_engine->funcs->read_channel_reply(aux_engine, size,
 								buffer, reply,
 								&status);
 
@@ -686,8 +685,7 @@ int dc_link_aux_transfer(struct ddc_service *ddc,
 		res = -1;
 		break;
 	}
-
-	i2caux->funcs->release_engine(i2caux, &engine->base);
+	aux_engine->base.funcs->release_engine(&aux_engine->base);
 	return res;
 }
 
diff --git a/drivers/gpu/drm/amd/display/dc/dce/Makefile b/drivers/gpu/drm/amd/display/dc/dce/Makefile
index 11401fd8e535..825537bd4545 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dce/Makefile
@@ -28,7 +28,7 @@
 
 DCE = dce_audio.o dce_stream_encoder.o dce_link_encoder.o dce_hwseq.o \
 dce_mem_input.o dce_clock_source.o dce_scl_filters.o dce_transform.o \
-dce_clocks.o dce_opp.o dce_dmcu.o dce_abm.o dce_ipp.o
+dce_clocks.o dce_opp.o dce_dmcu.o dce_abm.o dce_ipp.o dce_aux.o
 
 
 AMD_DAL_DCE = $(addprefix $(AMDDALPATH)/dc/dce/,$(DCE))
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
new file mode 100644
index 000000000000..b28e2120767e
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
@@ -0,0 +1,942 @@
+/*
+ * Copyright 2012-15 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#include "dm_services.h"
+#include "dce_aux.h"
+#include "dce/dce_11_0_sh_mask.h"
+
+#define CTX \
+	aux110->base.base.ctx
+#define REG(reg_name)\
+	(aux110->regs->reg_name)
+
+#define DC_LOGGER \
+	engine->base.ctx->logger
+
+#include "reg_helper.h"
+
+#define FROM_AUX_ENGINE(ptr) \
+	container_of((ptr), struct aux_engine_dce110, base)
+
+#define FROM_ENGINE(ptr) \
+	FROM_AUX_ENGINE(container_of((ptr), struct aux_engine, base))
+
+#define FROM_AUX_ENGINE_ENGINE(ptr) \
+	container_of((ptr), struct aux_engine, base)
+enum {
+	AUX_INVALID_REPLY_RETRY_COUNTER = 1,
+	AUX_TIMED_OUT_RETRY_COUNTER = 2,
+	AUX_DEFER_RETRY_COUNTER = 6
+};
+static void release_engine(
+	struct engine *engine)
+{
+	struct aux_engine_dce110 *aux110 = FROM_ENGINE(engine);
+
+	dal_ddc_close(engine->ddc);
+
+	engine->ddc = NULL;
+
+	REG_UPDATE(AUX_ARB_CONTROL, AUX_SW_DONE_USING_AUX_REG, 1);
+}
+
+#define SW_CAN_ACCESS_AUX 1
+#define DMCU_CAN_ACCESS_AUX 2
+
+static bool is_engine_available(
+	struct aux_engine *engine)
+{
+	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
+
+	uint32_t value = REG_READ(AUX_ARB_CONTROL);
+	uint32_t field = get_reg_field_value(
+			value,
+			AUX_ARB_CONTROL,
+			AUX_REG_RW_CNTL_STATUS);
+
+	return (field != DMCU_CAN_ACCESS_AUX);
+}
+static bool acquire_engine(
+	struct aux_engine *engine)
+{
+	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
+
+	uint32_t value = REG_READ(AUX_ARB_CONTROL);
+	uint32_t field = get_reg_field_value(
+			value,
+			AUX_ARB_CONTROL,
+			AUX_REG_RW_CNTL_STATUS);
+	if (field == DMCU_CAN_ACCESS_AUX)
+		return false;
+	/* enable AUX before request SW to access AUX */
+	value = REG_READ(AUX_CONTROL);
+	field = get_reg_field_value(value,
+				AUX_CONTROL,
+				AUX_EN);
+
+	if (field == 0) {
+		set_reg_field_value(
+				value,
+				1,
+				AUX_CONTROL,
+				AUX_EN);
+
+		if (REG(AUX_RESET_MASK)) {
+			/*DP_AUX block as part of the enable sequence*/
+			set_reg_field_value(
+				value,
+				1,
+				AUX_CONTROL,
+				AUX_RESET);
+		}
+
+		REG_WRITE(AUX_CONTROL, value);
+
+		if (REG(AUX_RESET_MASK)) {
+			/*poll HW to make sure reset it done*/
+
+			REG_WAIT(AUX_CONTROL, AUX_RESET_DONE, 1,
+					1, 11);
+
+			set_reg_field_value(
+				value,
+				0,
+				AUX_CONTROL,
+				AUX_RESET);
+
+			REG_WRITE(AUX_CONTROL, value);
+
+			REG_WAIT(AUX_CONTROL, AUX_RESET_DONE, 0,
+					1, 11);
+		}
+	} /*if (field)*/
+
+	/* request SW to access AUX */
+	REG_UPDATE(AUX_ARB_CONTROL, AUX_SW_USE_AUX_REG_REQ, 1);
+
+	value = REG_READ(AUX_ARB_CONTROL);
+	field = get_reg_field_value(
+			value,
+			AUX_ARB_CONTROL,
+			AUX_REG_RW_CNTL_STATUS);
+
+	return (field == SW_CAN_ACCESS_AUX);
+}
+
+#define COMPOSE_AUX_SW_DATA_16_20(command, address) \
+	((command) | ((0xF0000 & (address)) >> 16))
+
+#define COMPOSE_AUX_SW_DATA_8_15(address) \
+	((0xFF00 & (address)) >> 8)
+
+#define COMPOSE_AUX_SW_DATA_0_7(address) \
+	(0xFF & (address))
+
+static void submit_channel_request(
+	struct aux_engine *engine,
+	struct aux_request_transaction_data *request)
+{
+	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
+	uint32_t value;
+	uint32_t length;
+
+	bool is_write =
+		((request->type == AUX_TRANSACTION_TYPE_DP) &&
+		 (request->action == I2CAUX_TRANSACTION_ACTION_DP_WRITE)) ||
+		((request->type == AUX_TRANSACTION_TYPE_I2C) &&
+		((request->action == I2CAUX_TRANSACTION_ACTION_I2C_WRITE) ||
+		 (request->action == I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT)));
+	if (REG(AUXN_IMPCAL)) {
+		/* clear_aux_error */
+		REG_UPDATE_SEQ(AUXN_IMPCAL, AUXN_CALOUT_ERROR_AK,
+				1,
+				0);
+
+		REG_UPDATE_SEQ(AUXP_IMPCAL, AUXP_CALOUT_ERROR_AK,
+				1,
+				0);
+
+		/* force_default_calibrate */
+		REG_UPDATE_1BY1_2(AUXN_IMPCAL,
+				AUXN_IMPCAL_ENABLE, 1,
+				AUXN_IMPCAL_OVERRIDE_ENABLE, 0);
+
+		/* bug? why AUXN update EN and OVERRIDE_EN 1 by 1 while AUX P toggles OVERRIDE? */
+
+		REG_UPDATE_SEQ(AUXP_IMPCAL, AUXP_IMPCAL_OVERRIDE_ENABLE,
+				1,
+				0);
+	}
+	/* set the delay and the number of bytes to write */
+
+	/* The length include
+	 * the 4 bit header and the 20 bit address
+	 * (that is 3 byte).
+	 * If the requested length is non zero this means
+	 * an addition byte specifying the length is required.
+	 */
+
+	length = request->length ? 4 : 3;
+	if (is_write)
+		length += request->length;
+
+	REG_UPDATE_2(AUX_SW_CONTROL,
+			AUX_SW_START_DELAY, request->delay,
+			AUX_SW_WR_BYTES, length);
+
+	/* program action and address and payload data (if 'is_write') */
+	value = REG_UPDATE_4(AUX_SW_DATA,
+			AUX_SW_INDEX, 0,
+			AUX_SW_DATA_RW, 0,
+			AUX_SW_AUTOINCREMENT_DISABLE, 1,
+			AUX_SW_DATA, COMPOSE_AUX_SW_DATA_16_20(request->action, request->address));
+
+	value = REG_SET_2(AUX_SW_DATA, value,
+			AUX_SW_AUTOINCREMENT_DISABLE, 0,
+			AUX_SW_DATA, COMPOSE_AUX_SW_DATA_8_15(request->address));
+
+	value = REG_SET(AUX_SW_DATA, value,
+			AUX_SW_DATA, COMPOSE_AUX_SW_DATA_0_7(request->address));
+
+	if (request->length) {
+		value = REG_SET(AUX_SW_DATA, value,
+				AUX_SW_DATA, request->length - 1);
+	}
+
+	if (is_write) {
+		/* Load the HW buffer with the Data to be sent.
+		 * This is relevant for write operation.
+		 * For read, the data recived data will be
+		 * processed in process_channel_reply().
+		 */
+		uint32_t i = 0;
+
+		while (i < request->length) {
+			value = REG_SET(AUX_SW_DATA, value,
+					AUX_SW_DATA, request->data[i]);
+
+			++i;
+		}
+	}
+
+	REG_UPDATE(AUX_INTERRUPT_CONTROL, AUX_SW_DONE_ACK, 1);
+	REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 0,
+				10, aux110->timeout_period/10);
+	REG_UPDATE(AUX_SW_CONTROL, AUX_SW_GO, 1);
+}
+
+static int read_channel_reply(struct aux_engine *engine, uint32_t size,
+			      uint8_t *buffer, uint8_t *reply_result,
+			      uint32_t *sw_status)
+{
+	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
+	uint32_t bytes_replied;
+	uint32_t reply_result_32;
+
+	*sw_status = REG_GET(AUX_SW_STATUS, AUX_SW_REPLY_BYTE_COUNT,
+			     &bytes_replied);
+
+	/* In case HPD is LOW, exit AUX transaction */
+	if ((*sw_status & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK))
+		return -1;
+
+	/* Need at least the status byte */
+	if (!bytes_replied)
+		return -1;
+
+	REG_UPDATE_1BY1_3(AUX_SW_DATA,
+			  AUX_SW_INDEX, 0,
+			  AUX_SW_AUTOINCREMENT_DISABLE, 1,
+			  AUX_SW_DATA_RW, 1);
+
+	REG_GET(AUX_SW_DATA, AUX_SW_DATA, &reply_result_32);
+	reply_result_32 = reply_result_32 >> 4;
+	*reply_result = (uint8_t)reply_result_32;
+
+	if (reply_result_32 == 0) { /* ACK */
+		uint32_t i = 0;
+
+		/* First byte was already used to get the command status */
+		--bytes_replied;
+
+		/* Do not overflow buffer */
+		if (bytes_replied > size)
+			return -1;
+
+		while (i < bytes_replied) {
+			uint32_t aux_sw_data_val;
+
+			REG_GET(AUX_SW_DATA, AUX_SW_DATA, &aux_sw_data_val);
+			buffer[i] = aux_sw_data_val;
+			++i;
+		}
+
+		return i;
+	}
+
+	return 0;
+}
+
+static void process_channel_reply(
+	struct aux_engine *engine,
+	struct aux_reply_transaction_data *reply)
+{
+	int bytes_replied;
+	uint8_t reply_result;
+	uint32_t sw_status;
+
+	bytes_replied = read_channel_reply(engine, reply->length, reply->data,
+					   &reply_result, &sw_status);
+
+	/* in case HPD is LOW, exit AUX transaction */
+	if ((sw_status & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) {
+		reply->status = AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON;
+		return;
+	}
+
+	if (bytes_replied < 0) {
+		/* Need to handle an error case...
+		 * Hopefully, upper layer function won't call this function if
+		 * the number of bytes in the reply was 0, because there was
+		 * surely an error that was asserted that should have been
+		 * handled for hot plug case, this could happens
+		 */
+		if (!(sw_status & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK)) {
+			reply->status = AUX_TRANSACTION_REPLY_INVALID;
+			ASSERT_CRITICAL(false);
+			return;
+		}
+	} else {
+
+		switch (reply_result) {
+		case 0: /* ACK */
+			reply->status = AUX_TRANSACTION_REPLY_AUX_ACK;
+		break;
+		case 1: /* NACK */
+			reply->status = AUX_TRANSACTION_REPLY_AUX_NACK;
+		break;
+		case 2: /* DEFER */
+			reply->status = AUX_TRANSACTION_REPLY_AUX_DEFER;
+		break;
+		case 4: /* AUX ACK / I2C NACK */
+			reply->status = AUX_TRANSACTION_REPLY_I2C_NACK;
+		break;
+		case 8: /* AUX ACK / I2C DEFER */
+			reply->status = AUX_TRANSACTION_REPLY_I2C_DEFER;
+		break;
+		default:
+			reply->status = AUX_TRANSACTION_REPLY_INVALID;
+		}
+	}
+}
+
+static enum aux_channel_operation_result get_channel_status(
+	struct aux_engine *engine,
+	uint8_t *returned_bytes)
+{
+	struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(engine);
+
+	uint32_t value;
+
+	if (returned_bytes == NULL) {
+		/*caller pass NULL pointer*/
+		ASSERT_CRITICAL(false);
+		return AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN;
+	}
+	*returned_bytes = 0;
+
+	/* poll to make sure that SW_DONE is asserted */
+	value = REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 1,
+				10, aux110->timeout_period/10);
+
+	/* in case HPD is LOW, exit AUX transaction */
+	if ((value & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK))
+		return AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON;
+
+	/* Note that the following bits are set in 'status.bits'
+	 * during CTS 4.2.1.2 (FW 3.3.1):
+	 * AUX_SW_RX_MIN_COUNT_VIOL, AUX_SW_RX_INVALID_STOP,
+	 * AUX_SW_RX_RECV_NO_DET, AUX_SW_RX_RECV_INVALID_H.
+	 *
+	 * AUX_SW_RX_MIN_COUNT_VIOL is an internal,
+	 * HW debugging bit and should be ignored.
+	 */
+	if (value & AUX_SW_STATUS__AUX_SW_DONE_MASK) {
+		if ((value & AUX_SW_STATUS__AUX_SW_RX_TIMEOUT_STATE_MASK) ||
+			(value & AUX_SW_STATUS__AUX_SW_RX_TIMEOUT_MASK))
+			return AUX_CHANNEL_OPERATION_FAILED_TIMEOUT;
+
+		else if ((value & AUX_SW_STATUS__AUX_SW_RX_INVALID_STOP_MASK) ||
+			(value & AUX_SW_STATUS__AUX_SW_RX_RECV_NO_DET_MASK) ||
+			(value &
+				AUX_SW_STATUS__AUX_SW_RX_RECV_INVALID_H_MASK) ||
+			(value & AUX_SW_STATUS__AUX_SW_RX_RECV_INVALID_L_MASK))
+			return AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY;
+
+		*returned_bytes = get_reg_field_value(value,
+				AUX_SW_STATUS,
+				AUX_SW_REPLY_BYTE_COUNT);
+
+		if (*returned_bytes == 0)
+			return
+			AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY;
+		else {
+			*returned_bytes -= 1;
+			return AUX_CHANNEL_OPERATION_SUCCEEDED;
+		}
+	} else {
+		/*time_elapsed >= aux_engine->timeout_period
+		 *  AUX_SW_STATUS__AUX_SW_HPD_DISCON = at this point
+		 */
+		ASSERT_CRITICAL(false);
+		return AUX_CHANNEL_OPERATION_FAILED_TIMEOUT;
+	}
+}
+static void process_read_reply(
+	struct aux_engine *engine,
+	struct read_command_context *ctx)
+{
+	engine->funcs->process_channel_reply(engine, &ctx->reply);
+
+	switch (ctx->reply.status) {
+	case AUX_TRANSACTION_REPLY_AUX_ACK:
+		ctx->defer_retry_aux = 0;
+		if (ctx->returned_byte > ctx->current_read_length) {
+			ctx->status =
+				I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR;
+			ctx->operation_succeeded = false;
+		} else if (ctx->returned_byte < ctx->current_read_length) {
+			ctx->current_read_length -= ctx->returned_byte;
+
+			ctx->offset += ctx->returned_byte;
+
+			++ctx->invalid_reply_retry_aux_on_ack;
+
+			if (ctx->invalid_reply_retry_aux_on_ack >
+				AUX_INVALID_REPLY_RETRY_COUNTER) {
+				ctx->status =
+				I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR;
+				ctx->operation_succeeded = false;
+			}
+		} else {
+			ctx->status = I2CAUX_TRANSACTION_STATUS_SUCCEEDED;
+			ctx->transaction_complete = true;
+			ctx->operation_succeeded = true;
+		}
+	break;
+	case AUX_TRANSACTION_REPLY_AUX_NACK:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_NACK;
+		ctx->operation_succeeded = false;
+	break;
+	case AUX_TRANSACTION_REPLY_AUX_DEFER:
+		++ctx->defer_retry_aux;
+
+		if (ctx->defer_retry_aux > AUX_DEFER_RETRY_COUNTER) {
+			ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT;
+			ctx->operation_succeeded = false;
+		}
+	break;
+	case AUX_TRANSACTION_REPLY_I2C_DEFER:
+		ctx->defer_retry_aux = 0;
+
+		++ctx->defer_retry_i2c;
+
+		if (ctx->defer_retry_i2c > AUX_DEFER_RETRY_COUNTER) {
+			ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT;
+			ctx->operation_succeeded = false;
+		}
+	break;
+	case AUX_TRANSACTION_REPLY_HPD_DISCON:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON;
+		ctx->operation_succeeded = false;
+	break;
+	default:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_UNKNOWN;
+		ctx->operation_succeeded = false;
+	}
+}
+static void process_read_request(
+	struct aux_engine *engine,
+	struct read_command_context *ctx)
+{
+	enum aux_channel_operation_result operation_result;
+
+	engine->funcs->submit_channel_request(engine, &ctx->request);
+
+	operation_result = engine->funcs->get_channel_status(
+		engine, &ctx->returned_byte);
+
+	switch (operation_result) {
+	case AUX_CHANNEL_OPERATION_SUCCEEDED:
+		if (ctx->returned_byte > ctx->current_read_length) {
+			ctx->status =
+				I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR;
+			ctx->operation_succeeded = false;
+		} else {
+			ctx->timed_out_retry_aux = 0;
+			ctx->invalid_reply_retry_aux = 0;
+
+			ctx->reply.length = ctx->returned_byte;
+			ctx->reply.data = ctx->buffer;
+
+			process_read_reply(engine, ctx);
+		}
+	break;
+	case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY:
+		++ctx->invalid_reply_retry_aux;
+
+		if (ctx->invalid_reply_retry_aux >
+			AUX_INVALID_REPLY_RETRY_COUNTER) {
+			ctx->status =
+				I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR;
+			ctx->operation_succeeded = false;
+		} else
+			udelay(400);
+	break;
+	case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT:
+		++ctx->timed_out_retry_aux;
+
+		if (ctx->timed_out_retry_aux > AUX_TIMED_OUT_RETRY_COUNTER) {
+			ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT;
+			ctx->operation_succeeded = false;
+		} else {
+			/* DP 1.2a, table 2-58:
+			 * "S3: AUX Request CMD PENDING:
+			 * retry 3 times, with 400usec wait on each"
+			 * The HW timeout is set to 550usec,
+			 * so we should not wait here
+			 */
+		}
+	break;
+	case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON;
+		ctx->operation_succeeded = false;
+	break;
+	default:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_UNKNOWN;
+		ctx->operation_succeeded = false;
+	}
+}
+static bool read_command(
+	struct aux_engine *engine,
+	struct i2caux_transaction_request *request,
+	bool middle_of_transaction)
+{
+	struct read_command_context ctx;
+
+	ctx.buffer = request->payload.data;
+	ctx.current_read_length = request->payload.length;
+	ctx.offset = 0;
+	ctx.timed_out_retry_aux = 0;
+	ctx.invalid_reply_retry_aux = 0;
+	ctx.defer_retry_aux = 0;
+	ctx.defer_retry_i2c = 0;
+	ctx.invalid_reply_retry_aux_on_ack = 0;
+	ctx.transaction_complete = false;
+	ctx.operation_succeeded = true;
+
+	if (request->payload.address_space ==
+		I2CAUX_TRANSACTION_ADDRESS_SPACE_DPCD) {
+		ctx.request.type = AUX_TRANSACTION_TYPE_DP;
+		ctx.request.action = I2CAUX_TRANSACTION_ACTION_DP_READ;
+		ctx.request.address = request->payload.address;
+	} else if (request->payload.address_space ==
+		I2CAUX_TRANSACTION_ADDRESS_SPACE_I2C) {
+		ctx.request.type = AUX_TRANSACTION_TYPE_I2C;
+		ctx.request.action = middle_of_transaction ?
+			I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT :
+			I2CAUX_TRANSACTION_ACTION_I2C_READ;
+		ctx.request.address = request->payload.address >> 1;
+	} else {
+		/* in DAL2, there was no return in such case */
+		BREAK_TO_DEBUGGER();
+		return false;
+	}
+
+	ctx.request.delay = 0;
+
+	do {
+		memset(ctx.buffer + ctx.offset, 0, ctx.current_read_length);
+
+		ctx.request.data = ctx.buffer + ctx.offset;
+		ctx.request.length = ctx.current_read_length;
+
+		process_read_request(engine, &ctx);
+
+		request->status = ctx.status;
+
+		if (ctx.operation_succeeded && !ctx.transaction_complete)
+			if (ctx.request.type == AUX_TRANSACTION_TYPE_I2C)
+				msleep(engine->delay);
+	} while (ctx.operation_succeeded && !ctx.transaction_complete);
+
+	if (request->payload.address_space ==
+		I2CAUX_TRANSACTION_ADDRESS_SPACE_DPCD) {
+		DC_LOG_I2C_AUX("READ: addr:0x%x  value:0x%x Result:%d",
+				request->payload.address,
+				request->payload.data[0],
+				ctx.operation_succeeded);
+	}
+
+	return ctx.operation_succeeded;
+}
+
+static void process_write_reply(
+	struct aux_engine *engine,
+	struct write_command_context *ctx)
+{
+	engine->funcs->process_channel_reply(engine, &ctx->reply);
+
+	switch (ctx->reply.status) {
+	case AUX_TRANSACTION_REPLY_AUX_ACK:
+		ctx->operation_succeeded = true;
+
+		if (ctx->returned_byte) {
+			ctx->request.action = ctx->mot ?
+			I2CAUX_TRANSACTION_ACTION_I2C_STATUS_REQUEST_MOT :
+			I2CAUX_TRANSACTION_ACTION_I2C_STATUS_REQUEST;
+
+			ctx->current_write_length = 0;
+
+			++ctx->ack_m_retry;
+
+			if (ctx->ack_m_retry > AUX_DEFER_RETRY_COUNTER) {
+				ctx->status =
+				I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT;
+				ctx->operation_succeeded = false;
+			} else
+				udelay(300);
+		} else {
+			ctx->status = I2CAUX_TRANSACTION_STATUS_SUCCEEDED;
+			ctx->defer_retry_aux = 0;
+			ctx->ack_m_retry = 0;
+			ctx->transaction_complete = true;
+		}
+	break;
+	case AUX_TRANSACTION_REPLY_AUX_NACK:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_NACK;
+		ctx->operation_succeeded = false;
+	break;
+	case AUX_TRANSACTION_REPLY_AUX_DEFER:
+		++ctx->defer_retry_aux;
+
+		if (ctx->defer_retry_aux > ctx->max_defer_retry) {
+			ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT;
+			ctx->operation_succeeded = false;
+		}
+	break;
+	case AUX_TRANSACTION_REPLY_I2C_DEFER:
+		ctx->defer_retry_aux = 0;
+		ctx->current_write_length = 0;
+
+		ctx->request.action = ctx->mot ?
+			I2CAUX_TRANSACTION_ACTION_I2C_STATUS_REQUEST_MOT :
+			I2CAUX_TRANSACTION_ACTION_I2C_STATUS_REQUEST;
+
+		++ctx->defer_retry_i2c;
+
+		if (ctx->defer_retry_i2c > ctx->max_defer_retry) {
+			ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT;
+			ctx->operation_succeeded = false;
+		}
+	break;
+	case AUX_TRANSACTION_REPLY_HPD_DISCON:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON;
+		ctx->operation_succeeded = false;
+	break;
+	default:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_UNKNOWN;
+		ctx->operation_succeeded = false;
+	}
+}
+static void process_write_request(
+	struct aux_engine *engine,
+	struct write_command_context *ctx)
+{
+	enum aux_channel_operation_result operation_result;
+
+	engine->funcs->submit_channel_request(engine, &ctx->request);
+
+	operation_result = engine->funcs->get_channel_status(
+		engine, &ctx->returned_byte);
+
+	switch (operation_result) {
+	case AUX_CHANNEL_OPERATION_SUCCEEDED:
+		ctx->timed_out_retry_aux = 0;
+		ctx->invalid_reply_retry_aux = 0;
+
+		ctx->reply.length = ctx->returned_byte;
+		ctx->reply.data = ctx->reply_data;
+
+		process_write_reply(engine, ctx);
+	break;
+	case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY:
+		++ctx->invalid_reply_retry_aux;
+
+		if (ctx->invalid_reply_retry_aux >
+			AUX_INVALID_REPLY_RETRY_COUNTER) {
+			ctx->status =
+				I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR;
+			ctx->operation_succeeded = false;
+		} else
+			udelay(400);
+	break;
+	case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT:
+		++ctx->timed_out_retry_aux;
+
+		if (ctx->timed_out_retry_aux > AUX_TIMED_OUT_RETRY_COUNTER) {
+			ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT;
+			ctx->operation_succeeded = false;
+		} else {
+			/* DP 1.2a, table 2-58:
+			 * "S3: AUX Request CMD PENDING:
+			 * retry 3 times, with 400usec wait on each"
+			 * The HW timeout is set to 550usec,
+			 * so we should not wait here
+			 */
+		}
+	break;
+	case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON;
+		ctx->operation_succeeded = false;
+	break;
+	default:
+		ctx->status = I2CAUX_TRANSACTION_STATUS_UNKNOWN;
+		ctx->operation_succeeded = false;
+	}
+}
+static bool write_command(
+	struct aux_engine *engine,
+	struct i2caux_transaction_request *request,
+	bool middle_of_transaction)
+{
+	struct write_command_context ctx;
+
+	ctx.mot = middle_of_transaction;
+	ctx.buffer = request->payload.data;
+	ctx.current_write_length = request->payload.length;
+	ctx.timed_out_retry_aux = 0;
+	ctx.invalid_reply_retry_aux = 0;
+	ctx.defer_retry_aux = 0;
+	ctx.defer_retry_i2c = 0;
+	ctx.ack_m_retry = 0;
+	ctx.transaction_complete = false;
+	ctx.operation_succeeded = true;
+
+	if (request->payload.address_space ==
+		I2CAUX_TRANSACTION_ADDRESS_SPACE_DPCD) {
+		ctx.request.type = AUX_TRANSACTION_TYPE_DP;
+		ctx.request.action = I2CAUX_TRANSACTION_ACTION_DP_WRITE;
+		ctx.request.address = request->payload.address;
+	} else if (request->payload.address_space ==
+		I2CAUX_TRANSACTION_ADDRESS_SPACE_I2C) {
+		ctx.request.type = AUX_TRANSACTION_TYPE_I2C;
+		ctx.request.action = middle_of_transaction ?
+			I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT :
+			I2CAUX_TRANSACTION_ACTION_I2C_WRITE;
+		ctx.request.address = request->payload.address >> 1;
+	} else {
+		/* in DAL2, there was no return in such case */
+		BREAK_TO_DEBUGGER();
+		return false;
+	}
+
+	ctx.request.delay = 0;
+
+	ctx.max_defer_retry =
+		(engine->max_defer_write_retry > AUX_DEFER_RETRY_COUNTER) ?
+			engine->max_defer_write_retry : AUX_DEFER_RETRY_COUNTER;
+
+	do {
+		ctx.request.data = ctx.buffer;
+		ctx.request.length = ctx.current_write_length;
+
+		process_write_request(engine, &ctx);
+
+		request->status = ctx.status;
+
+		if (ctx.operation_succeeded && !ctx.transaction_complete)
+			if (ctx.request.type == AUX_TRANSACTION_TYPE_I2C)
+				msleep(engine->delay);
+	} while (ctx.operation_succeeded && !ctx.transaction_complete);
+
+	if (request->payload.address_space ==
+		I2CAUX_TRANSACTION_ADDRESS_SPACE_DPCD) {
+		DC_LOG_I2C_AUX("WRITE: addr:0x%x  value:0x%x Result:%d",
+				request->payload.address,
+				request->payload.data[0],
+				ctx.operation_succeeded);
+	}
+
+	return ctx.operation_succeeded;
+}
+static bool end_of_transaction_command(
+	struct aux_engine *engine,
+	struct i2caux_transaction_request *request)
+{
+	struct i2caux_transaction_request dummy_request;
+	uint8_t dummy_data;
+
+	/* [tcheng] We only need to send the stop (read with MOT = 0)
+	 * for I2C-over-Aux, not native AUX
+	 */
+
+	if (request->payload.address_space !=
+		I2CAUX_TRANSACTION_ADDRESS_SPACE_I2C)
+		return false;
+
+	dummy_request.operation = request->operation;
+	dummy_request.payload.address_space = request->payload.address_space;
+	dummy_request.payload.address = request->payload.address;
+
+	/*
+	 * Add a dummy byte due to some receiver quirk
+	 * where one byte is sent along with MOT = 0.
+	 * Ideally this should be 0.
+	 */
+
+	dummy_request.payload.length = 0;
+	dummy_request.payload.data = &dummy_data;
+
+	if (request->operation == I2CAUX_TRANSACTION_READ)
+		return read_command(engine, &dummy_request, false);
+	else
+		return write_command(engine, &dummy_request, false);
+
+	/* according Syed, it does not need now DoDummyMOT */
+}
+bool submit_request(
+	struct engine *engine,
+	struct i2caux_transaction_request *request,
+	bool middle_of_transaction)
+{
+	struct aux_engine *aux_engine = FROM_AUX_ENGINE_ENGINE(engine);
+
+	bool result;
+	bool mot_used = true;
+
+	switch (request->operation) {
+	case I2CAUX_TRANSACTION_READ:
+		result = read_command(aux_engine, request, mot_used);
+	break;
+	case I2CAUX_TRANSACTION_WRITE:
+		result = write_command(aux_engine, request, mot_used);
+	break;
+	default:
+		result = false;
+	}
+
+	/* [tcheng]
+	 * need to send stop for the last transaction to free up the AUX
+	 * if the above command fails, this would be the last transaction
+	 */
+
+	if (!middle_of_transaction || !result)
+		end_of_transaction_command(aux_engine, request);
+
+	/* mask AUX interrupt */
+
+	return result;
+}
+enum i2caux_engine_type get_engine_type(
+		const struct engine *engine)
+{
+	return I2CAUX_ENGINE_TYPE_AUX;
+}
+
+static struct aux_engine *acquire(
+	struct engine *engine,
+	struct ddc *ddc)
+{
+	struct aux_engine *aux_engine = FROM_AUX_ENGINE_ENGINE(engine);
+	enum gpio_result result;
+
+	if (aux_engine->funcs->is_engine_available) {
+		/*check whether SW could use the engine*/
+		if (!aux_engine->funcs->is_engine_available(aux_engine))
+			return NULL;
+	}
+
+	result = dal_ddc_open(ddc, GPIO_MODE_HARDWARE,
+		GPIO_DDC_CONFIG_TYPE_MODE_AUX);
+
+	if (result != GPIO_RESULT_OK)
+		return NULL;
+
+	if (!aux_engine->funcs->acquire_engine(aux_engine)) {
+		dal_ddc_close(ddc);
+		return NULL;
+	}
+
+	engine->ddc = ddc;
+
+	return aux_engine;
+}
+
+static const struct aux_engine_funcs aux_engine_funcs = {
+	.acquire_engine = acquire_engine,
+	.submit_channel_request = submit_channel_request,
+	.process_channel_reply = process_channel_reply,
+	.read_channel_reply = read_channel_reply,
+	.get_channel_status = get_channel_status,
+	.is_engine_available = is_engine_available,
+};
+
+static const struct engine_funcs engine_funcs = {
+	.release_engine = release_engine,
+	.destroy_engine = dce110_engine_destroy,
+	.submit_request = submit_request,
+	.get_engine_type = get_engine_type,
+	.acquire = acquire,
+};
+
+void dce110_engine_destroy(struct engine **engine)
+{
+
+	struct aux_engine_dce110 *engine110 = FROM_ENGINE(*engine);
+
+	kfree(engine110);
+	*engine = NULL;
+
+}
+struct aux_engine *dce110_aux_engine_construct(struct aux_engine_dce110 *aux_engine110,
+		struct dc_context *ctx,
+		uint32_t inst,
+		uint32_t timeout_period,
+		const struct dce110_aux_registers *regs)
+{
+	aux_engine110->base.base.ddc = NULL;
+	aux_engine110->base.base.ctx = ctx;
+	aux_engine110->base.delay = 0;
+	aux_engine110->base.max_defer_write_retry = 0;
+	aux_engine110->base.base.funcs = &engine_funcs;
+	aux_engine110->base.funcs = &aux_engine_funcs;
+	aux_engine110->base.base.inst = inst;
+	aux_engine110->timeout_period = timeout_period;
+	aux_engine110->regs = regs;
+
+	return &aux_engine110->base;
+}
+
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h
new file mode 100644
index 000000000000..c6b2aec2e367
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2012-15 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef __DAL_AUX_ENGINE_DCE110_H__
+#define __DAL_AUX_ENGINE_DCE110_H__
+#include "aux_engine.h"
+
+#define AUX_COMMON_REG_LIST(id)\
+	SRI(AUX_CONTROL, DP_AUX, id), \
+	SRI(AUX_ARB_CONTROL, DP_AUX, id), \
+	SRI(AUX_SW_DATA, DP_AUX, id), \
+	SRI(AUX_SW_CONTROL, DP_AUX, id), \
+	SRI(AUX_INTERRUPT_CONTROL, DP_AUX, id), \
+	SRI(AUX_SW_STATUS, DP_AUX, id), \
+	SR(AUXN_IMPCAL), \
+	SR(AUXP_IMPCAL)
+
+struct dce110_aux_registers {
+	uint32_t AUX_CONTROL;
+	uint32_t AUX_ARB_CONTROL;
+	uint32_t AUX_SW_DATA;
+	uint32_t AUX_SW_CONTROL;
+	uint32_t AUX_INTERRUPT_CONTROL;
+	uint32_t AUX_SW_STATUS;
+	uint32_t AUXN_IMPCAL;
+	uint32_t AUXP_IMPCAL;
+
+	uint32_t AUX_RESET_MASK;
+};
+
+enum {	/* This is the timeout as defined in DP 1.2a,
+	 * 2.3.4 "Detailed uPacket TX AUX CH State Description".
+	 */
+	AUX_TIMEOUT_PERIOD = 400,
+
+	/* Ideally, the SW timeout should be just above 550usec
+	 * which is programmed in HW.
+	 * But the SW timeout of 600usec is not reliable,
+	 * because on some systems, delay_in_microseconds()
+	 * returns faster than it should.
+	 * EPR #379763: by trial-and-error on different systems,
+	 * 700usec is the minimum reliable SW timeout for polling
+	 * the AUX_SW_STATUS.AUX_SW_DONE bit.
+	 * This timeout expires *only* when there is
+	 * AUX Error or AUX Timeout conditions - not during normal operation.
+	 * During normal operation, AUX_SW_STATUS.AUX_SW_DONE bit is set
+	 * at most within ~240usec. That means,
+	 * increasing this timeout will not affect normal operation,
+	 * and we'll timeout after
+	 * SW_AUX_TIMEOUT_PERIOD_MULTIPLIER * AUX_TIMEOUT_PERIOD = 1600usec.
+	 * This timeout is especially important for
+	 * resume from S3 and CTS.
+	 */
+	SW_AUX_TIMEOUT_PERIOD_MULTIPLIER = 4
+};
+struct aux_engine_dce110 {
+	struct aux_engine base;
+	const struct dce110_aux_registers *regs;
+	struct {
+		uint32_t aux_control;
+		uint32_t aux_arb_control;
+		uint32_t aux_sw_data;
+		uint32_t aux_sw_control;
+		uint32_t aux_interrupt_control;
+		uint32_t aux_sw_status;
+	} addr;
+	uint32_t timeout_period;
+};
+
+struct aux_engine_dce110_init_data {
+	uint32_t engine_id;
+	uint32_t timeout_period;
+	struct dc_context *ctx;
+	const struct dce110_aux_registers *regs;
+};
+
+struct aux_engine *dce110_aux_engine_construct(
+		struct aux_engine_dce110 *aux_engine110,
+		struct dc_context *ctx,
+		uint32_t inst,
+		uint32_t timeout_period,
+		const struct dce110_aux_registers *regs);
+
+void dce110_engine_destroy(struct engine **engine);
+
+bool dce110_aux_engine_acquire(
+	struct engine *aux_engine,
+	struct ddc *ddc);
+#endif
diff --git a/drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c b/drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c
index ad8ad4e1437c..c34c9531915e 100644
--- a/drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c
@@ -52,6 +52,7 @@
 #include "dce/dce_10_0_sh_mask.h"
 
 #include "dce/dce_dmcu.h"
+#include "dce/dce_aux.h"
 #include "dce/dce_abm.h"
 
 #ifndef mmMC_HUB_RDREQ_DMIF_LIMIT
@@ -279,7 +280,20 @@ static const struct dce_opp_shift opp_shift = {
 static const struct dce_opp_mask opp_mask = {
 	OPP_COMMON_MASK_SH_LIST_DCE_100(_MASK)
 };
+#define aux_engine_regs(id)\
+[id] = {\
+	AUX_COMMON_REG_LIST(id), \
+	.AUX_RESET_MASK = 0 \
+}
 
+static const struct dce110_aux_registers aux_engine_regs[] = {
+		aux_engine_regs(0),
+		aux_engine_regs(1),
+		aux_engine_regs(2),
+		aux_engine_regs(3),
+		aux_engine_regs(4),
+		aux_engine_regs(5)
+};
 
 #define audio_regs(id)\
 [id] = {\
@@ -572,6 +586,23 @@ struct output_pixel_processor *dce100_opp_create(
 	return &opp->base;
 }
 
+struct engine *dce100_aux_engine_create(
+	struct dc_context *ctx,
+	uint32_t inst)
+{
+	struct aux_engine_dce110 *aux_engine =
+		kzalloc(sizeof(struct aux_engine_dce110), GFP_KERNEL);
+
+	if (!aux_engine)
+		return NULL;
+
+	dce110_aux_engine_construct(aux_engine, ctx, inst,
+				    SW_AUX_TIMEOUT_PERIOD_MULTIPLIER * AUX_TIMEOUT_PERIOD,
+				    &aux_engine_regs[inst]);
+
+	return &aux_engine->base.base;
+}
+
 struct clock_source *dce100_clock_source_create(
 	struct dc_context *ctx,
 	struct dc_bios *bios,
@@ -624,6 +655,10 @@ static void destruct(struct dce110_resource_pool *pool)
 			kfree(DCE110TG_FROM_TG(pool->base.timing_generators[i]));
 			pool->base.timing_generators[i] = NULL;
 		}
+
+		if (pool->base.engines[i] != NULL)
+			dce110_engine_destroy(&pool->base.engines[i]);
+
 	}
 
 	for (i = 0; i < pool->base.stream_enc_count; i++) {
@@ -928,6 +963,13 @@ static bool construct(
 				"DC: failed to create output pixel processor!\n");
 			goto res_create_fail;
 		}
+		pool->base.engines[i] = dce100_aux_engine_create(ctx, i);
+		if (pool->base.engines[i] == NULL) {
+			BREAK_TO_DEBUGGER();
+			dm_error(
+				"DC:failed to create aux engine!!\n");
+			goto res_create_fail;
+		}
 	}
 
 	dc->caps.max_planes =  pool->base.pipe_count;
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
index 1c902e49a712..4a665a29191b 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
@@ -49,6 +49,7 @@
 #include "dce/dce_clock_source.h"
 #include "dce/dce_hwseq.h"
 #include "dce110/dce110_hw_sequencer.h"
+#include "dce/dce_aux.h"
 #include "dce/dce_abm.h"
 #include "dce/dce_dmcu.h"
 
@@ -306,6 +307,21 @@ static const struct dce_opp_mask opp_mask = {
 	OPP_COMMON_MASK_SH_LIST_DCE_110(_MASK)
 };
 
+#define aux_engine_regs(id)\
+[id] = {\
+	AUX_COMMON_REG_LIST(id), \
+	.AUX_RESET_MASK = 0 \
+}
+
+static const struct dce110_aux_registers aux_engine_regs[] = {
+		aux_engine_regs(0),
+		aux_engine_regs(1),
+		aux_engine_regs(2),
+		aux_engine_regs(3),
+		aux_engine_regs(4),
+		aux_engine_regs(5)
+};
+
 #define audio_regs(id)\
 [id] = {\
 	AUD_COMMON_REG_LIST(id)\
@@ -588,6 +604,23 @@ static struct output_pixel_processor *dce110_opp_create(
 	return &opp->base;
 }
 
+struct engine *dce110_aux_engine_create(
+	struct dc_context *ctx,
+	uint32_t inst)
+{
+	struct aux_engine_dce110 *aux_engine =
+		kzalloc(sizeof(struct aux_engine_dce110), GFP_KERNEL);
+
+	if (!aux_engine)
+		return NULL;
+
+	dce110_aux_engine_construct(aux_engine, ctx, inst,
+				    SW_AUX_TIMEOUT_PERIOD_MULTIPLIER * AUX_TIMEOUT_PERIOD,
+				    &aux_engine_regs[inst]);
+
+	return &aux_engine->base.base;
+}
+
 struct clock_source *dce110_clock_source_create(
 	struct dc_context *ctx,
 	struct dc_bios *bios,
@@ -651,6 +684,10 @@ static void destruct(struct dce110_resource_pool *pool)
 			kfree(DCE110TG_FROM_TG(pool->base.timing_generators[i]));
 			pool->base.timing_generators[i] = NULL;
 		}
+
+		if (pool->base.engines[i] != NULL)
+			dce110_engine_destroy(&pool->base.engines[i]);
+
 	}
 
 	for (i = 0; i < pool->base.stream_enc_count; i++) {
@@ -1258,6 +1295,14 @@ static bool construct(
 				"DC: failed to create output pixel processor!\n");
 			goto res_create_fail;
 		}
+
+		pool->base.engines[i] = dce110_aux_engine_create(ctx, i);
+		if (pool->base.engines[i] == NULL) {
+			BREAK_TO_DEBUGGER();
+			dm_error(
+				"DC:failed to create aux engine!!\n");
+			goto res_create_fail;
+		}
 	}
 
 	dc->fbc_compressor = dce110_compressor_create(ctx);
diff --git a/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c b/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
index 30d5b32892d6..caf90ae2cbb0 100644
--- a/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
@@ -49,6 +49,7 @@
 #include "dce112/dce112_hw_sequencer.h"
 #include "dce/dce_abm.h"
 #include "dce/dce_dmcu.h"
+#include "dce/dce_aux.h"
 
 #include "reg_helper.h"
 
@@ -314,6 +315,21 @@ static const struct dce_opp_mask opp_mask = {
 	OPP_COMMON_MASK_SH_LIST_DCE_112(_MASK)
 };
 
+#define aux_engine_regs(id)\
+[id] = {\
+	AUX_COMMON_REG_LIST(id), \
+	.AUX_RESET_MASK = 0 \
+}
+
+static const struct dce110_aux_registers aux_engine_regs[] = {
+		aux_engine_regs(0),
+		aux_engine_regs(1),
+		aux_engine_regs(2),
+		aux_engine_regs(3),
+		aux_engine_regs(4),
+		aux_engine_regs(5)
+};
+
 #define audio_regs(id)\
 [id] = {\
 	AUD_COMMON_REG_LIST(id)\
@@ -588,6 +604,23 @@ struct output_pixel_processor *dce112_opp_create(
 	return &opp->base;
 }
 
+struct engine *dce112_aux_engine_create(
+	struct dc_context *ctx,
+	uint32_t inst)
+{
+	struct aux_engine_dce110 *aux_engine =
+		kzalloc(sizeof(struct aux_engine_dce110), GFP_KERNEL);
+
+	if (!aux_engine)
+		return NULL;
+
+	dce110_aux_engine_construct(aux_engine, ctx, inst,
+				    SW_AUX_TIMEOUT_PERIOD_MULTIPLIER * AUX_TIMEOUT_PERIOD,
+				    &aux_engine_regs[inst]);
+
+	return &aux_engine->base.base;
+}
+
 struct clock_source *dce112_clock_source_create(
 	struct dc_context *ctx,
 	struct dc_bios *bios,
@@ -625,6 +658,9 @@ static void destruct(struct dce110_resource_pool *pool)
 		if (pool->base.opps[i] != NULL)
 			dce110_opp_destroy(&pool->base.opps[i]);
 
+		if (pool->base.engines[i] != NULL)
+			dce110_engine_destroy(&pool->base.engines[i]);
+
 		if (pool->base.transforms[i] != NULL)
 			dce112_transform_destroy(&pool->base.transforms[i]);
 
@@ -640,6 +676,10 @@ static void destruct(struct dce110_resource_pool *pool)
 			kfree(DCE110TG_FROM_TG(pool->base.timing_generators[i]));
 			pool->base.timing_generators[i] = NULL;
 		}
+
+		if (pool->base.engines[i] != NULL)
+			dce110_engine_destroy(&pool->base.engines[i]);
+
 	}
 
 	for (i = 0; i < pool->base.stream_enc_count; i++) {
@@ -1208,6 +1248,13 @@ static bool construct(
 				"DC:failed to create output pixel processor!\n");
 			goto res_create_fail;
 		}
+		pool->base.engines[i] = dce112_aux_engine_create(ctx, i);
+		if (pool->base.engines[i] == NULL) {
+			BREAK_TO_DEBUGGER();
+			dm_error(
+				"DC:failed to create aux engine!!\n");
+			goto res_create_fail;
+		}
 	}
 
 	if (!resource_construct(num_virtual_links, dc, &pool->base,
diff --git a/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c b/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
index 8381f27a2361..e389832c96cc 100644
--- a/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
@@ -53,6 +53,7 @@
 #include "dce/dce_hwseq.h"
 #include "dce/dce_abm.h"
 #include "dce/dce_dmcu.h"
+#include "dce/dce_aux.h"
 
 #include "dce/dce_12_0_offset.h"
 #include "dce/dce_12_0_sh_mask.h"
@@ -297,6 +298,20 @@ static const struct dce_opp_shift opp_shift = {
 static const struct dce_opp_mask opp_mask = {
 	OPP_COMMON_MASK_SH_LIST_DCE_120(_MASK)
 };
+ #define aux_engine_regs(id)\
+[id] = {\
+	AUX_COMMON_REG_LIST(id), \
+	.AUX_RESET_MASK = 0 \
+}
+
+static const struct dce110_aux_registers aux_engine_regs[] = {
+		aux_engine_regs(0),
+		aux_engine_regs(1),
+		aux_engine_regs(2),
+		aux_engine_regs(3),
+		aux_engine_regs(4),
+		aux_engine_regs(5)
+};
 
 #define audio_regs(id)\
 [id] = {\
@@ -361,6 +376,22 @@ struct output_pixel_processor *dce120_opp_create(
 			     ctx, inst, &opp_regs[inst], &opp_shift, &opp_mask);
 	return &opp->base;
 }
+struct engine *dce120_aux_engine_create(
+	struct dc_context *ctx,
+	uint32_t inst)
+{
+	struct aux_engine_dce110 *aux_engine =
+		kzalloc(sizeof(struct aux_engine_dce110), GFP_KERNEL);
+
+	if (!aux_engine)
+		return NULL;
+
+	dce110_aux_engine_construct(aux_engine, ctx, inst,
+				    SW_AUX_TIMEOUT_PERIOD_MULTIPLIER * AUX_TIMEOUT_PERIOD,
+				    &aux_engine_regs[inst]);
+
+	return &aux_engine->base.base;
+}
 
 static const struct bios_registers bios_regs = {
 	.BIOS_SCRATCH_6 = mmBIOS_SCRATCH_6 + NBIO_BASE(mmBIOS_SCRATCH_6_BASE_IDX)
@@ -467,6 +498,10 @@ static void destruct(struct dce110_resource_pool *pool)
 			kfree(DCE110TG_FROM_TG(pool->base.timing_generators[i]));
 			pool->base.timing_generators[i] = NULL;
 		}
+
+		if (pool->base.engines[i] != NULL)
+			dce110_engine_destroy(&pool->base.engines[i]);
+
 	}
 
 	for (i = 0; i < pool->base.audio_count; i++) {
@@ -984,6 +1019,13 @@ static bool construct(
 			dm_error(
 				"DC: failed to create output pixel processor!\n");
 		}
+		pool->base.engines[i] = dce120_aux_engine_create(ctx, i);
+				if (pool->base.engines[i] == NULL) {
+					BREAK_TO_DEBUGGER();
+					dm_error(
+						"DC:failed to create aux engine!!\n");
+					goto res_create_fail;
+				}
 
 		/* check next valid pipe */
 		j++;
diff --git a/drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c b/drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c
index 2ac95ec2bf96..6fb33ad2d3c8 100644
--- a/drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c
@@ -54,6 +54,7 @@
 #include "reg_helper.h"
 
 #include "dce/dce_dmcu.h"
+#include "dce/dce_aux.h"
 #include "dce/dce_abm.h"
 /* TODO remove this include */
 
@@ -298,6 +299,21 @@ static const struct dce_opp_mask opp_mask = {
 	OPP_COMMON_MASK_SH_LIST_DCE_80(_MASK)
 };
 
+#define aux_engine_regs(id)\
+[id] = {\
+	AUX_COMMON_REG_LIST(id), \
+	.AUX_RESET_MASK = 0 \
+}
+
+static const struct dce110_aux_registers aux_engine_regs[] = {
+		aux_engine_regs(0),
+		aux_engine_regs(1),
+		aux_engine_regs(2),
+		aux_engine_regs(3),
+		aux_engine_regs(4),
+		aux_engine_regs(5)
+};
+
 #define audio_regs(id)\
 [id] = {\
 	AUD_COMMON_REG_LIST(id)\
@@ -448,6 +464,23 @@ static struct output_pixel_processor *dce80_opp_create(
 	return &opp->base;
 }
 
+struct engine *dce80_aux_engine_create(
+	struct dc_context *ctx,
+	uint32_t inst)
+{
+	struct aux_engine_dce110 *aux_engine =
+		kzalloc(sizeof(struct aux_engine_dce110), GFP_KERNEL);
+
+	if (!aux_engine)
+		return NULL;
+
+	dce110_aux_engine_construct(aux_engine, ctx, inst,
+				    SW_AUX_TIMEOUT_PERIOD_MULTIPLIER * AUX_TIMEOUT_PERIOD,
+				    &aux_engine_regs[inst]);
+
+	return &aux_engine->base.base;
+}
+
 static struct stream_encoder *dce80_stream_encoder_create(
 	enum engine_id eng_id,
 	struct dc_context *ctx)
@@ -655,6 +688,9 @@ static void destruct(struct dce110_resource_pool *pool)
 			kfree(DCE110TG_FROM_TG(pool->base.timing_generators[i]));
 			pool->base.timing_generators[i] = NULL;
 		}
+
+		if (pool->base.engines[i] != NULL)
+			dce110_engine_destroy(&pool->base.engines[i]);
 	}
 
 	for (i = 0; i < pool->base.stream_enc_count; i++) {
@@ -899,6 +935,14 @@ static bool dce80_construct(
 			dm_error("DC: failed to create output pixel processor!\n");
 			goto res_create_fail;
 		}
+
+		pool->base.engines[i] = dce80_aux_engine_create(ctx, i);
+		if (pool->base.engines[i] == NULL) {
+			BREAK_TO_DEBUGGER();
+			dm_error(
+				"DC:failed to create aux engine!!\n");
+			goto res_create_fail;
+		}
 	}
 
 	dc->caps.max_planes =  pool->base.pipe_count;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
index 84581b3c392b..ef8bb2735620 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
@@ -64,6 +64,7 @@
 #include "reg_helper.h"
 #include "dce/dce_abm.h"
 #include "dce/dce_dmcu.h"
+#include "dce/dce_aux.h"
 
 const struct _vcs_dpi_ip_params_st dcn1_0_ip = {
 	.rob_buffer_size_kbytes = 64,
@@ -356,6 +357,21 @@ static const struct dcn10_opp_mask opp_mask = {
 		OPP_MASK_SH_LIST_DCN10(_MASK),
 };
 
+#define aux_engine_regs(id)\
+[id] = {\
+	AUX_COMMON_REG_LIST(id), \
+	.AUX_RESET_MASK = 0 \
+}
+
+static const struct dce110_aux_registers aux_engine_regs[] = {
+		aux_engine_regs(0),
+		aux_engine_regs(1),
+		aux_engine_regs(2),
+		aux_engine_regs(3),
+		aux_engine_regs(4),
+		aux_engine_regs(5)
+};
+
 #define tf_regs(id)\
 [id] = {\
 	TF_REG_LIST_DCN10(id),\
@@ -578,6 +594,23 @@ static struct output_pixel_processor *dcn10_opp_create(
 	return &opp->base;
 }
 
+struct engine *dcn10_aux_engine_create(
+	struct dc_context *ctx,
+	uint32_t inst)
+{
+	struct aux_engine_dce110 *aux_engine =
+		kzalloc(sizeof(struct aux_engine_dce110), GFP_KERNEL);
+
+	if (!aux_engine)
+		return NULL;
+
+	dce110_aux_engine_construct(aux_engine, ctx, inst,
+				    SW_AUX_TIMEOUT_PERIOD_MULTIPLIER * AUX_TIMEOUT_PERIOD,
+				    &aux_engine_regs[inst]);
+
+	return &aux_engine->base.base;
+}
+
 static struct mpc *dcn10_mpc_create(struct dc_context *ctx)
 {
 	struct dcn10_mpc *mpc10 = kzalloc(sizeof(struct dcn10_mpc),
@@ -826,6 +859,9 @@ static void destruct(struct dcn10_resource_pool *pool)
 			kfree(DCN10TG_FROM_TG(pool->base.timing_generators[i]));
 			pool->base.timing_generators[i] = NULL;
 		}
+
+		if (pool->base.engines[i] != NULL)
+			pool->base.engines[i]->funcs->destroy_engine(&pool->base.engines[i]);
 	}
 
 	for (i = 0; i < pool->base.stream_enc_count; i++)
@@ -1255,6 +1291,14 @@ static bool construct(
 			goto fail;
 		}
 
+		pool->base.engines[i] = dcn10_aux_engine_create(ctx, i);
+		if (pool->base.engines[i] == NULL) {
+			BREAK_TO_DEBUGGER();
+			dm_error(
+				"DC:failed to create aux engine!!\n");
+			goto fail;
+		}
+
 		/* check next valid pipe */
 		j++;
 	}
diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/engine.h b/drivers/gpu/drm/amd/display/dc/i2caux/engine.h
index 1e8a1585e401..b16fb1ff687d 100644
--- a/drivers/gpu/drm/amd/display/dc/i2caux/engine.h
+++ b/drivers/gpu/drm/amd/display/dc/i2caux/engine.h
@@ -96,6 +96,7 @@ struct engine_funcs {
 
 struct engine {
 	const struct engine_funcs *funcs;
+	uint32_t inst;
 	struct ddc *ddc;
 	struct dc_context *ctx;
 };
diff --git a/drivers/gpu/drm/amd/display/dc/inc/core_types.h b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
index 4446652a9a9e..0fa385872ed3 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
@@ -138,7 +138,7 @@ struct resource_pool {
 	struct output_pixel_processor *opps[MAX_PIPES];
 	struct timing_generator *timing_generators[MAX_PIPES];
 	struct stream_encoder *stream_enc[MAX_PIPES * 2];
-
+	struct engine *engines[MAX_PIPES];
 	struct hubbub *hubbub;
 	struct mpc *mpc;
 	struct pp_smu_funcs_rv *pp_smu;
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/aux_engine.h b/drivers/gpu/drm/amd/display/dc/inc/hw/aux_engine.h
new file mode 100644
index 000000000000..06d7e5d4cf21
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/aux_engine.h
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2012-15 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef __DAL_AUX_ENGINE_H__
+#define __DAL_AUX_ENGINE_H__
+
+#include "engine.h"
+#include "include/i2caux_interface.h"
+
+struct aux_engine;
+union aux_config;
+struct aux_engine_funcs {
+	void (*destroy)(
+		struct aux_engine **ptr);
+	bool (*acquire_engine)(
+		struct aux_engine *engine);
+	void (*configure)(
+		struct aux_engine *engine,
+		union aux_config cfg);
+	void (*submit_channel_request)(
+		struct aux_engine *engine,
+		struct aux_request_transaction_data *request);
+	void (*process_channel_reply)(
+		struct aux_engine *engine,
+		struct aux_reply_transaction_data *reply);
+	int (*read_channel_reply)(
+		struct aux_engine *engine,
+		uint32_t size,
+		uint8_t *buffer,
+		uint8_t *reply_result,
+		uint32_t *sw_status);
+	enum aux_channel_operation_result (*get_channel_status)(
+		struct aux_engine *engine,
+		uint8_t *returned_bytes);
+	bool (*is_engine_available)(struct aux_engine *engine);
+};
+struct engine;
+struct aux_engine {
+	struct engine base;
+	const struct aux_engine_funcs *funcs;
+	/* following values are expressed in milliseconds */
+	uint32_t delay;
+	uint32_t max_defer_write_retry;
+
+	bool acquire_reset;
+};
+struct read_command_context {
+	uint8_t *buffer;
+	uint32_t current_read_length;
+	uint32_t offset;
+	enum i2caux_transaction_status status;
+
+	struct aux_request_transaction_data request;
+	struct aux_reply_transaction_data reply;
+
+	uint8_t returned_byte;
+
+	uint32_t timed_out_retry_aux;
+	uint32_t invalid_reply_retry_aux;
+	uint32_t defer_retry_aux;
+	uint32_t defer_retry_i2c;
+	uint32_t invalid_reply_retry_aux_on_ack;
+
+	bool transaction_complete;
+	bool operation_succeeded;
+};
+struct write_command_context {
+	bool mot;
+
+	uint8_t *buffer;
+	uint32_t current_write_length;
+	enum i2caux_transaction_status status;
+
+	struct aux_request_transaction_data request;
+	struct aux_reply_transaction_data reply;
+
+	uint8_t returned_byte;
+
+	uint32_t timed_out_retry_aux;
+	uint32_t invalid_reply_retry_aux;
+	uint32_t defer_retry_aux;
+	uint32_t defer_retry_i2c;
+	uint32_t max_defer_retry;
+	uint32_t ack_m_retry;
+
+	uint8_t reply_data[DEFAULT_AUX_MAX_DATA_SIZE];
+
+	bool transaction_complete;
+	bool operation_succeeded;
+};
+#endif
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/engine.h b/drivers/gpu/drm/amd/display/dc/inc/hw/engine.h
new file mode 100644
index 000000000000..1f5476f41236
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/engine.h
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2012-15 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef __DAL_ENGINE_H__
+#define __DAL_ENGINE_H__
+
+#include "dc_ddc_types.h"
+
+enum i2caux_transaction_operation {
+	I2CAUX_TRANSACTION_READ,
+	I2CAUX_TRANSACTION_WRITE
+};
+
+enum i2caux_transaction_address_space {
+	I2CAUX_TRANSACTION_ADDRESS_SPACE_I2C = 1,
+	I2CAUX_TRANSACTION_ADDRESS_SPACE_DPCD
+};
+
+struct i2caux_transaction_payload {
+	enum i2caux_transaction_address_space address_space;
+	uint32_t address;
+	uint32_t length;
+	uint8_t *data;
+};
+
+enum i2caux_transaction_status {
+	I2CAUX_TRANSACTION_STATUS_UNKNOWN = (-1L),
+	I2CAUX_TRANSACTION_STATUS_SUCCEEDED,
+	I2CAUX_TRANSACTION_STATUS_FAILED_CHANNEL_BUSY,
+	I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT,
+	I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR,
+	I2CAUX_TRANSACTION_STATUS_FAILED_NACK,
+	I2CAUX_TRANSACTION_STATUS_FAILED_INCOMPLETE,
+	I2CAUX_TRANSACTION_STATUS_FAILED_OPERATION,
+	I2CAUX_TRANSACTION_STATUS_FAILED_INVALID_OPERATION,
+	I2CAUX_TRANSACTION_STATUS_FAILED_BUFFER_OVERFLOW,
+	I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON
+};
+
+struct i2caux_transaction_request {
+	enum i2caux_transaction_operation operation;
+	struct i2caux_transaction_payload payload;
+	enum i2caux_transaction_status status;
+};
+
+enum i2caux_engine_type {
+	I2CAUX_ENGINE_TYPE_UNKNOWN = (-1L),
+	I2CAUX_ENGINE_TYPE_AUX,
+	I2CAUX_ENGINE_TYPE_I2C_DDC_HW,
+	I2CAUX_ENGINE_TYPE_I2C_GENERIC_HW,
+	I2CAUX_ENGINE_TYPE_I2C_SW
+};
+
+enum i2c_default_speed {
+	I2CAUX_DEFAULT_I2C_HW_SPEED = 50,
+	I2CAUX_DEFAULT_I2C_SW_SPEED = 50
+};
+
+struct engine;
+
+struct engine_funcs {
+	enum i2caux_engine_type (*get_engine_type)(
+		const struct engine *engine);
+	struct aux_engine* (*acquire)(
+		struct engine *engine,
+		struct ddc *ddc);
+	bool (*submit_request)(
+		struct engine *engine,
+		struct i2caux_transaction_request *request,
+		bool middle_of_transaction);
+	void (*release_engine)(
+		struct engine *engine);
+	void (*destroy_engine)(
+		struct engine **engine);
+};
+
+struct engine {
+	const struct engine_funcs *funcs;
+	uint32_t inst;
+	struct ddc *ddc;
+	struct dc_context *ctx;
+};
+
+#endif