drm/amd/display: Add missing encoder setup to DACnEncoderControl

Apparently the DAC encoder needs to be set up before use.
The BIOS parser in DC did not support this so I assumed it was
not necessary, but the DAC doesn't work without it on some GPUs.

Fixes: 69b29b8 ("drm/amd/display: Hook up DAC to bios_parser_encoder_control")
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit bb5dfe2)

Author: Timur Kristóf

drivers/gpu/drm/amd/display/dc/bios/bios_parser.c

@@ -763,14 +763,14 @@ static enum bp_result bios_parser_encoder_control(
 			return BP_RESULT_FAILURE;
 
 		return bp->cmd_tbl.dac1_encoder_control(
-			bp, cntl->action == ENCODER_CONTROL_ENABLE,
+			bp, cntl->action,
 			cntl->pixel_clock, ATOM_DAC1_PS2);
 	} else if (cntl->engine_id == ENGINE_ID_DACB) {
 		if (!bp->cmd_tbl.dac2_encoder_control)
 			return BP_RESULT_FAILURE;
 
 		return bp->cmd_tbl.dac2_encoder_control(
-			bp, cntl->action == ENCODER_CONTROL_ENABLE,
+			bp, cntl->action,
 			cntl->pixel_clock, ATOM_DAC1_PS2);
 	}
 

drivers/gpu/drm/amd/display/dc/bios/command_table.c

@@ -1838,12 +1838,12 @@ static enum bp_result select_crtc_source_v3(
 
 static enum bp_result dac1_encoder_control_v1(
 	struct bios_parser *bp,
-	bool enable,
+	enum bp_encoder_control_action action,
 	uint32_t pixel_clock,
 	uint8_t dac_standard);
 static enum bp_result dac2_encoder_control_v1(
 	struct bios_parser *bp,
-	bool enable,
+	enum bp_encoder_control_action action,
 	uint32_t pixel_clock,
 	uint8_t dac_standard);
 
@@ -1869,12 +1869,15 @@ static void init_dac_encoder_control(struct bios_parser *bp)
 
 static void dac_encoder_control_prepare_params(
 	DAC_ENCODER_CONTROL_PS_ALLOCATION *params,
-	bool enable,
+	enum bp_encoder_control_action action,
 	uint32_t pixel_clock,
 	uint8_t dac_standard)
 {
 	params->ucDacStandard = dac_standard;
-	if (enable)
+	if (action == ENCODER_CONTROL_SETUP ||
+	    action == ENCODER_CONTROL_INIT)
+		params->ucAction = ATOM_ENCODER_INIT;
+	else if (action == ENCODER_CONTROL_ENABLE)
 		params->ucAction = ATOM_ENABLE;
 	else
 		params->ucAction = ATOM_DISABLE;
@@ -1887,7 +1890,7 @@ static void dac_encoder_control_prepare_params(
 
 static enum bp_result dac1_encoder_control_v1(
 	struct bios_parser *bp,
-	bool enable,
+	enum bp_encoder_control_action action,
 	uint32_t pixel_clock,
 	uint8_t dac_standard)
 {
@@ -1896,7 +1899,7 @@ static enum bp_result dac1_encoder_control_v1(
 
 	dac_encoder_control_prepare_params(
 		&params,
-		enable,
+		action,
 		pixel_clock,
 		dac_standard);
 
@@ -1908,7 +1911,7 @@ static enum bp_result dac1_encoder_control_v1(
 
 static enum bp_result dac2_encoder_control_v1(
 	struct bios_parser *bp,
-	bool enable,
+	enum bp_encoder_control_action action,
 	uint32_t pixel_clock,
 	uint8_t dac_standard)
 {
@@ -1917,7 +1920,7 @@ static enum bp_result dac2_encoder_control_v1(
 
 	dac_encoder_control_prepare_params(
 		&params,
-		enable,
+		action,
 		pixel_clock,
 		dac_standard);
 

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

@@ -57,12 +57,12 @@ struct cmd_tbl {
 		struct bp_crtc_source_select *bp_params);
 	enum bp_result (*dac1_encoder_control)(
 		struct bios_parser *bp,
-		bool enable,
+		enum bp_encoder_control_action action,
 		uint32_t pixel_clock,
 		uint8_t dac_standard);
 	enum bp_result (*dac2_encoder_control)(
 		struct bios_parser *bp,
-		bool enable,
+		enum bp_encoder_control_action action,
 		uint32_t pixel_clock,
 		uint8_t dac_standard);
 	enum bp_result (*dac1_output_control)(