path: root/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1075-drm-amd-display-Switch-ddc-to-new-aux-interface.patch

From 0b1b8d4167395baef1260ac57f4ac14b981b4498 Mon Sep 17 00:00:00 2001
From: David Francis <David.Francis@amd.com>
Date: Thu, 29 Nov 2018 14:36:25 -0500
Subject: [PATCH 1075/2940] drm/amd/display: Switch ddc to new aux interface

[Why]
The old aux interface goes through i2caux and the aux_engine
and engine function pointers.  The multiple layers of indirection
make it hard to tell waht is happening.  The aux algorithm
does not need to be this complicated: attempt to submit the
request.  If you get an ack (reply = 0), stop.  Otherwise,
retry, up to 7 times.

[How]
Add a new helper function in dce_aux that performs aux retries

Move the plumbing of the aux calling code into dce_aux

Add functions in ddc that redirect directly to dce_aux

Make all aux calls use these functions

Signed-off-by: David Francis <David.Francis@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>
---
 .../gpu/drm/amd/display/dc/core/dc_link_ddc.c | 175 +++---------------
 drivers/gpu/drm/amd/display/dc/dce/dce_aux.c  |  99 ++++++++++
 drivers/gpu/drm/amd/display/dc/dce/dce_aux.h  |   6 +
 .../gpu/drm/amd/display/dc/inc/dc_link_ddc.h  |  12 +-
 4 files changed, 137 insertions(+), 155 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 5ac65737a1e8..a343b8b6f7fb 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
@@ -34,6 +34,7 @@
 #include "core_types.h"
 #include "dc_link_ddc.h"
 #include "aux_engine.h"
+#include "dce/dce_aux.h"
 
 #define AUX_POWER_UP_WA_DELAY 500
 #define I2C_OVER_AUX_DEFER_WA_DELAY 70
@@ -164,43 +165,6 @@ static void dal_ddc_i2c_payloads_destroy(struct i2c_payloads **p)
 
 }
 
-static struct aux_payloads *dal_ddc_aux_payloads_create(struct dc_context *ctx, uint32_t count)
-{
-	struct aux_payloads *payloads;
-
-	payloads = kzalloc(sizeof(struct aux_payloads), GFP_KERNEL);
-
-	if (!payloads)
-		return NULL;
-
-	if (dal_vector_construct(
-		&payloads->payloads, ctx, count, sizeof(struct aux_payload)))
-		return payloads;
-
-	kfree(payloads);
-	return NULL;
-}
-
-static struct aux_payload *dal_ddc_aux_payloads_get(struct aux_payloads *p)
-{
-	return (struct aux_payload *)p->payloads.container;
-}
-
-static uint32_t  dal_ddc_aux_payloads_get_count(struct aux_payloads *p)
-{
-	return p->payloads.count;
-}
-
-static void dal_ddc_aux_payloads_destroy(struct aux_payloads **p)
-{
-	if (!p || !*p)
-		return;
-
-	dal_vector_destruct(&(*p)->payloads);
-	kfree(*p);
-	*p = NULL;
-}
-
 #define DDC_MIN(a, b) (((a) < (b)) ? (a) : (b))
 
 void dal_ddc_i2c_payloads_add(
@@ -224,32 +188,6 @@ void dal_ddc_i2c_payloads_add(
 
 }
 
-void dal_ddc_aux_payloads_add(
-	struct aux_payloads *payloads,
-	uint32_t address,
-	uint32_t len,
-	uint8_t *data,
-	bool write,
-	bool mot,
-	uint32_t defer_delay)
-{
-	uint32_t payload_size = DEFAULT_AUX_MAX_DATA_SIZE;
-	uint32_t pos;
-
-	for (pos = 0; pos < len; pos += payload_size) {
-		struct aux_payload payload = {
-			.i2c_over_aux = true,
-			.write = write,
-			.address = address,
-			.length = DDC_MIN(payload_size, len - pos),
-			.data = data + pos,
-			.reply = NULL,
-			.mot = mot,
-			.defer_delay = defer_delay};
-		dal_vector_append(&payloads->payloads, &payload);
-	}
-}
-
 static void construct(
 	struct ddc_service *ddc_service,
 	struct ddc_service_init_data *init_data)
@@ -578,32 +516,34 @@ bool dal_ddc_service_query_ddc_data(
 	/*TODO: len of payload data for i2c and aux is uint8!!!!,
 	 *  but we want to read 256 over i2c!!!!*/
 	if (dal_ddc_service_is_in_aux_transaction_mode(ddc)) {
-
-		struct aux_payloads *payloads =
-			dal_ddc_aux_payloads_create(ddc->ctx, payloads_num);
-
-		struct aux_command command = {
-			.payloads = dal_ddc_aux_payloads_get(payloads),
-			.number_of_payloads = 0,
+		struct aux_payload write_payload = {
+			.i2c_over_aux = true,
+			.write = true,
+			.mot = true,
+			.address = address,
+			.length = write_size,
+			.data = write_buf,
+			.reply = NULL,
 			.defer_delay = get_defer_delay(ddc),
-			.max_defer_write_retry = 0 };
+		};
 
-		dal_ddc_aux_payloads_add(
-			payloads, address, write_size, write_buf, true, true, get_defer_delay(ddc));
-
-		dal_ddc_aux_payloads_add(
-			payloads, address, read_size, read_buf, false, false, get_defer_delay(ddc));
-
-		command.number_of_payloads =
-			dal_ddc_aux_payloads_get_count(payloads);
+		struct aux_payload read_payload = {
+			.i2c_over_aux = true,
+			.write = false,
+			.mot = false,
+			.address = address,
+			.length = read_size,
+			.data = read_buf,
+			.reply = NULL,
+			.defer_delay = get_defer_delay(ddc),
+		};
 
-		ret = dal_i2caux_submit_aux_command(
-				ddc->ctx->i2caux,
-				ddc->ddc_pin,
-				&command);
+		ret = dc_link_aux_transfer_with_retries(ddc, &write_payload);
 
-		dal_ddc_aux_payloads_destroy(&payloads);
+		if (!ret)
+			return false;
 
+		ret = dc_link_aux_transfer_with_retries(ddc, &read_payload);
 	} else {
 		struct i2c_payloads *payloads =
 			dal_ddc_i2c_payloads_create(ddc->ctx, payloads_num);
@@ -634,73 +574,16 @@ bool dal_ddc_service_query_ddc_data(
 	return ret;
 }
 
-static enum i2caux_transaction_action i2caux_action_from_payload(struct aux_payload *payload)
+int dc_link_aux_transfer(struct ddc_service *ddc,
+		struct aux_payload *payload)
 {
-	if (payload->i2c_over_aux) {
-		if (payload->write) {
-			if (payload->mot)
-				return I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT;
-			return I2CAUX_TRANSACTION_ACTION_I2C_WRITE;
-		}
-		if (payload->mot)
-			return I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT;
-		return I2CAUX_TRANSACTION_ACTION_I2C_READ;
-	}
-	if (payload->write)
-		return I2CAUX_TRANSACTION_ACTION_DP_WRITE;
-	return I2CAUX_TRANSACTION_ACTION_DP_READ;
+	return dce_aux_transfer(ddc, payload);
 }
 
-int dc_link_aux_transfer(struct ddc_service *ddc,
+bool dc_link_aux_transfer_with_retries(struct ddc_service *ddc,
 		struct aux_payload *payload)
 {
-	struct ddc *ddc_pin = ddc->ddc_pin;
-	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;
-	uint8_t returned_bytes = 0;
-	int res = -1;
-	uint32_t status;
-
-	memset(&aux_req, 0, sizeof(aux_req));
-	memset(&aux_rep, 0, sizeof(aux_rep));
-
-	aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
-	aux_engine->funcs->acquire(aux_engine, ddc_pin);
-
-	if (payload->i2c_over_aux)
-		aux_req.type = AUX_TRANSACTION_TYPE_I2C;
-	else
-		aux_req.type = AUX_TRANSACTION_TYPE_DP;
-
-	aux_req.action = i2caux_action_from_payload(payload);
-
-	aux_req.address = payload->address;
-	aux_req.delay = payload->defer_delay * 10;
-	aux_req.length = payload->length;
-	aux_req.data = payload->data;
-
-	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 = aux_engine->funcs->read_channel_reply(aux_engine, payload->length,
-							payload->data, payload->reply,
-							&status);
-		break;
-	case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON:
-		res = 0;
-		break;
-	case AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN:
-	case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY:
-	case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT:
-		res = -1;
-		break;
-	}
-	aux_engine->funcs->release_engine(aux_engine);
-	return res;
+	return dce_aux_transfer_with_retries(ddc, payload);
 }
 
 /*test only function*/
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
index 760bc5cc329d..566061529c58 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
@@ -24,6 +24,7 @@
  */
 
 #include "dm_services.h"
+#include "core_types.h"
 #include "dce_aux.h"
 #include "dce/dce_11_0_sh_mask.h"
 
@@ -936,3 +937,101 @@ struct aux_engine *dce110_aux_engine_construct(struct aux_engine_dce110 *aux_eng
 	return &aux_engine110->base;
 }
 
+static enum i2caux_transaction_action i2caux_action_from_payload(struct aux_payload *payload)
+{
+	if (payload->i2c_over_aux) {
+		if (payload->write) {
+			if (payload->mot)
+				return I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT;
+			return I2CAUX_TRANSACTION_ACTION_I2C_WRITE;
+		}
+		if (payload->mot)
+			return I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT;
+		return I2CAUX_TRANSACTION_ACTION_I2C_READ;
+	}
+	if (payload->write)
+		return I2CAUX_TRANSACTION_ACTION_DP_WRITE;
+	return I2CAUX_TRANSACTION_ACTION_DP_READ;
+}
+
+int dce_aux_transfer(struct ddc_service *ddc,
+		struct aux_payload *payload)
+{
+	struct ddc *ddc_pin = ddc->ddc_pin;
+	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;
+	uint8_t returned_bytes = 0;
+	int res = -1;
+	uint32_t status;
+
+	memset(&aux_req, 0, sizeof(aux_req));
+	memset(&aux_rep, 0, sizeof(aux_rep));
+
+	aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
+	aux_engine->funcs->acquire(aux_engine, ddc_pin);
+
+	if (payload->i2c_over_aux)
+		aux_req.type = AUX_TRANSACTION_TYPE_I2C;
+	else
+		aux_req.type = AUX_TRANSACTION_TYPE_DP;
+
+	aux_req.action = i2caux_action_from_payload(payload);
+
+	aux_req.address = payload->address;
+	aux_req.delay = payload->defer_delay * 10;
+	aux_req.length = payload->length;
+	aux_req.data = payload->data;
+
+	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 = aux_engine->funcs->read_channel_reply(aux_engine, payload->length,
+							payload->data, payload->reply,
+							&status);
+		break;
+	case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON:
+		res = 0;
+		break;
+	case AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN:
+	case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY:
+	case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT:
+		res = -1;
+		break;
+	}
+	aux_engine->funcs->release_engine(aux_engine);
+	return res;
+}
+
+#define AUX_RETRY_MAX 7
+
+bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
+		struct aux_payload *payload)
+{
+	int i, ret = 0;
+	uint8_t reply;
+	bool payload_reply = true;
+
+	if (!payload->reply) {
+		payload_reply = false;
+		payload->reply = &reply;
+	}
+
+	for (i = 0; i < AUX_RETRY_MAX; i++) {
+		ret = dce_aux_transfer(ddc, payload);
+
+		if (ret >= 0) {
+			if (*payload->reply == 0) {
+				if (!payload_reply)
+					payload->reply = NULL;
+				return true;
+			}
+		}
+
+		msleep(1);
+	}
+	return false;
+}
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h
index f7caab85dc80..990e7c7e191e 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h
@@ -108,4 +108,10 @@ void dce110_engine_destroy(struct aux_engine **engine);
 bool dce110_aux_engine_acquire(
 	struct aux_engine *aux_engine,
 	struct ddc *ddc);
+
+int dce_aux_transfer(struct ddc_service *ddc,
+		struct aux_payload *cmd);
+
+bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
+		struct aux_payload *cmd);
 #endif
diff --git a/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h b/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h
index b609cd886455..16fd4dc6c4dd 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h
@@ -64,15 +64,6 @@ void dal_ddc_i2c_payloads_add(
 		uint8_t *data,
 		bool write);
 
-void dal_ddc_aux_payloads_add(
-		struct aux_payloads *payloads,
-		uint32_t address,
-		uint32_t len,
-		uint8_t *data,
-		bool write,
-		bool mot,
-		uint32_t defer_delay);
-
 struct ddc_service_init_data {
 	struct graphics_object_id id;
 	struct dc_context *ctx;
@@ -107,6 +98,9 @@ bool dal_ddc_service_query_ddc_data(
 int dc_link_aux_transfer(struct ddc_service *ddc,
 		struct aux_payload *payload);
 
+bool dc_link_aux_transfer_with_retries(struct ddc_service *ddc,
+		struct aux_payload *payload);
+
 void dal_ddc_service_write_scdc_data(
 		struct ddc_service *ddc_service,
 		uint32_t pix_clk,
-- 
2.17.1