drm/amd/display: Support for SET_CONFIG processing with DMUB

[Why]
To process SET_CONFIG transactions with DMUB using inbox1 and
outbox1 mail boxes.

[How]
1) Added inbox1 DPIA command subtype DMUB_CMD__DPIA_SET_CONFIG_ACCESS to
   issue SET_CONFIG command to DMUB in dc_process_dmub_set_config_async().
   DMUB processes the command with DPIA sends reply back immediately or
   in an outbox1 message triggering an outbox1 interrupt to driver.
2) DMUB posts SET_CONFIG reply as an Outbox1 message of type
   DMUB_OUT_CMD__SET_CONFIG_REPLY.
3) The dmub async to sync mechanism for AUX is modified to accommodate
   SET_CONFIG commands for both command issue and reply code paths.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Wayne Lin <Wayne.Lin@amd.com>
Acked-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -3676,6 +3676,56 @@ uint8_t get_link_index_from_dpia_port_index(const struct dc *dc,
 	return link_index;
 }
 
+/**
+ *****************************************************************************
+ *  Function: dc_process_dmub_set_config_async
+ *
+ *  @brief
+ *		Submits set_config command to dmub via inbox message
+ *
+ *  @param
+ *		[in] dc: dc structure
+ *		[in] link_index: link index
+ *		[in] payload: aux payload
+ *		[out] notify: set_config immediate reply
+ *
+ *	@return
+ *		True if successful, False if failure
+ *****************************************************************************
+ */
+bool dc_process_dmub_set_config_async(struct dc *dc,
+				uint32_t link_index,
+				struct set_config_cmd_payload *payload,
+				struct dmub_notification *notify)
+{
+	union dmub_rb_cmd cmd = {0};
+	struct dc_dmub_srv *dmub_srv = dc->ctx->dmub_srv;
+	bool is_cmd_complete = true;
+
+	/* prepare SET_CONFIG command */
+	cmd.set_config_access.header.type = DMUB_CMD__DPIA;
+	cmd.set_config_access.header.sub_type = DMUB_CMD__DPIA_SET_CONFIG_ACCESS;
+
+	cmd.set_config_access.set_config_control.instance = dc->links[link_index]->ddc_hw_inst;
+	cmd.set_config_access.set_config_control.cmd_pkt.msg_type = payload->msg_type;
+	cmd.set_config_access.set_config_control.cmd_pkt.msg_data = payload->msg_data;
+
+	if (!dc_dmub_srv_cmd_with_reply_data(dmub_srv, &cmd)) {
+		/* command is not processed by dmub */
+		notify->sc_status = SET_CONFIG_UNKNOWN_ERROR;
+		return is_cmd_complete;
+	}
+
+	/* command processed by dmub, if ret_status is 1, it is completed instantly */
+	if (cmd.set_config_access.header.ret_status == 1)
+		notify->sc_status = cmd.set_config_access.set_config_control.immed_status;
+	else
+		/* cmd pending, will receive notification via outbox */
+		is_cmd_complete = false;
+
+	return is_cmd_complete;
+}
+
 /**
  * dc_disable_accelerated_mode - disable accelerated mode
  * @dc: dc structure

drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c

@@ -32,6 +32,8 @@
 #include "dpcd_defs.h"
 #include "link_hwss.h"
 #include "inc/link_dpcd.h"
+#include "dm_helpers.h"
+#include "dmub/inc/dmub_cmd.h"
 
 #define DC_LOGGER \
 	link->ctx->logger
@@ -92,10 +94,18 @@ static enum link_training_result dpia_configure_link(struct dc_link *link,
 }
 
 static enum dc_status core_link_send_set_config(struct dc_link *link,
-		uint8_t msg_type, uint8_t msg_data)
+	uint8_t msg_type,
+	uint8_t msg_data)
 {
-	/** @todo Implement */
-	return DC_OK;
+	struct set_config_cmd_payload payload;
+	enum set_config_status set_config_result = SET_CONFIG_PENDING;
+
+	/* prepare set_config payload */
+	payload.msg_type = msg_type;
+	payload.msg_data = msg_data;
+
+	/* set_config should return ACK if successful */
+	return (set_config_result == SET_CONFIG_ACK_RECEIVED) ? DC_OK : DC_ERROR_UNEXPECTED;
 }
 
 /* Build SET_CONFIG message data payload for specified message type. */

drivers/gpu/drm/amd/display/dc/core/dc_stat.c

@@ -64,7 +64,8 @@ void dc_stat_get_dmub_notification(const struct dc *dc, struct dmub_notification
 
 	/* For HPD/HPD RX, convert dpia port index into link index */
 	if (notify->type == DMUB_NOTIFICATION_HPD ||
-	    notify->type == DMUB_NOTIFICATION_HPD_IRQ) {
+	    notify->type == DMUB_NOTIFICATION_HPD_IRQ ||
+	    notify->type == DMUB_NOTIFICATION_SET_CONFIG_REPLY) {
 		notify->link_index =
 			get_link_index_from_dpia_port_index(dc, notify->link_index);
 	}

drivers/gpu/drm/amd/display/dc/dc.h

@@ -44,6 +44,8 @@
 
 /* forward declaration */
 struct aux_payload;
+struct set_config_cmd_payload;
+struct dmub_notification;
 
 #define DC_VER "3.2.156"
 
@@ -1397,6 +1399,11 @@ bool dc_process_dmub_aux_transfer_async(struct dc *dc,
 /* Get dc link index from dpia port index */
 uint8_t get_link_index_from_dpia_port_index(const struct dc *dc,
 				uint8_t dpia_port_index);
+
+bool dc_process_dmub_set_config_async(struct dc *dc,
+				uint32_t link_index,
+				struct set_config_cmd_payload *payload,
+				struct dmub_notification *notify);
 /*******************************************************************************
  * DSC Interfaces
  ******************************************************************************/

drivers/gpu/drm/amd/display/dc/dm_helpers.h

@@ -179,4 +179,9 @@ int dm_helper_dmub_aux_transfer_sync(
 		const struct dc_link *link,
 		struct aux_payload *payload,
 		enum aux_return_code_type *operation_result);
+enum set_config_status;
+int dm_helpers_dmub_set_config_sync(struct dc_context *ctx,
+		const struct dc_link *link,
+		struct set_config_cmd_payload *payload,
+		enum set_config_status *operation_result);
 #endif /* __DM_HELPERS__ */

drivers/gpu/drm/amd/display/dmub/dmub_srv.h

@@ -119,6 +119,7 @@ enum dmub_notification_type {
 	DMUB_NOTIFICATION_AUX_REPLY,
 	DMUB_NOTIFICATION_HPD,
 	DMUB_NOTIFICATION_HPD_IRQ,
+	DMUB_NOTIFICATION_SET_CONFIG_REPLY,
 	DMUB_NOTIFICATION_MAX
 };
 
@@ -440,6 +441,7 @@ struct dmub_notification {
 	union {
 		struct aux_reply_data aux_reply;
 		enum dp_hpd_status hpd_status;
+		enum set_config_status sc_status;
 	};
 };
 

drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h

@@ -683,11 +683,16 @@ enum dmub_out_cmd_type {
 	 * Command type used for DP HPD event notification
 	 */
 	DMUB_OUT_CMD__DP_HPD_NOTIFY = 2,
+	/**
+	 * Command type used for SET_CONFIG Reply notification
+	 */
+	DMUB_OUT_CMD__SET_CONFIG_REPLY = 3,
 };
 
 /* DMUB_CMD__DPIA command sub-types. */
 enum dmub_cmd_dpia_type {
 	DMUB_CMD__DPIA_DIG1_DPIA_CONTROL = 0,
+	DMUB_CMD__DPIA_SET_CONFIG_ACCESS = 1,
 };
 
 #pragma pack(push, 1)
@@ -1037,6 +1042,31 @@ struct dmub_rb_cmd_dig1_dpia_control {
 	struct dmub_cmd_dig_dpia_control_data dpia_control;
 };
 
+/**
+ * SET_CONFIG Command Payload
+ */
+struct set_config_cmd_payload {
+	uint8_t msg_type; /* set config message type */
+	uint8_t msg_data; /* set config message data */
+};
+
+/**
+ * Data passed from driver to FW in a DMUB_CMD__DPIA_SET_CONFIG_ACCESS command.
+ */
+struct dmub_cmd_set_config_control_data {
+	struct set_config_cmd_payload cmd_pkt;
+	uint8_t instance; /* DPIA instance */
+	uint8_t immed_status; /* Immediate status returned in case of error */
+};
+
+/**
+ * DMUB command structure for SET_CONFIG command.
+ */
+struct dmub_rb_cmd_set_config_access {
+	struct dmub_cmd_header header; /* header */
+	struct dmub_cmd_set_config_control_data set_config_control; /* set config data */
+};
+
 /**
  * struct dmub_rb_cmd_dpphy_init - DPPHY init.
  */
@@ -1284,6 +1314,33 @@ struct dmub_rb_cmd_dp_hpd_notify {
 	struct dp_hpd_data hpd_data;
 };
 
+/**
+ * Definition of a SET_CONFIG reply from DPOA.
+ */
+enum set_config_status {
+	SET_CONFIG_PENDING = 0,
+	SET_CONFIG_ACK_RECEIVED,
+	SET_CONFIG_RX_TIMEOUT,
+	SET_CONFIG_UNKNOWN_ERROR,
+};
+
+/**
+ * Definition of a set_config reply
+ */
+struct set_config_reply_control_data {
+	uint8_t instance; /* DPIA Instance */
+	uint8_t status; /* Set Config reply */
+	uint16_t pad; /* Alignment */
+};
+
+/**
+ * Definition of a DMUB_OUT_CMD__SET_CONFIG_REPLY command.
+ */
+struct dmub_rb_cmd_dp_set_config_reply {
+	struct dmub_cmd_header header;
+	struct set_config_reply_control_data set_config_reply_control;
+};
+
 /*
  * Command IDs should be treated as stable ABI.
  * Do not reuse or modify IDs.
@@ -2482,6 +2539,10 @@ union dmub_rb_cmd {
 	 * Definition of a DMUB_CMD__DPIA_DIG1_CONTROL command.
 	 */
 	struct dmub_rb_cmd_dig1_dpia_control dig1_dpia_control;
+	/**
+	 * Definition of a DMUB_CMD__DPIA_SET_CONFIG_ACCESS command.
+	 */
+	struct dmub_rb_cmd_set_config_access set_config_access;
 	/**
 	 * Definition of a DMUB_CMD__EDID_CEA command.
 	 */
@@ -2504,6 +2565,10 @@ union dmub_rb_out_cmd {
 	 * HPD notify command.
 	 */
 	struct dmub_rb_cmd_dp_hpd_notify dp_hpd_notify;
+	/**
+	 * SET_CONFIG reply command.
+	 */
+	struct dmub_rb_cmd_dp_set_config_reply set_config_reply;
 };
 #pragma pack(pop)
 

drivers/gpu/drm/amd/display/dmub/src/dmub_srv_stat.c

@@ -87,6 +87,11 @@ enum dmub_status dmub_srv_stat_get_notification(struct dmub_srv *dmub,
 		notify->link_index = cmd.dp_hpd_notify.hpd_data.instance;
 		notify->result = AUX_RET_SUCCESS;
 		break;
+	case DMUB_OUT_CMD__SET_CONFIG_REPLY:
+		notify->type = DMUB_NOTIFICATION_SET_CONFIG_REPLY;
+		notify->link_index = cmd.set_config_reply.set_config_reply_control.instance;
+		notify->sc_status = cmd.set_config_reply.set_config_reply_control.status;
+		break;
 	default:
 		notify->type = DMUB_NOTIFICATION_NO_DATA;
 		break;