drm/amd/display: support main link off before specific vertical line

[Why]
Some panels request main link off before specific vertical line.
If source turn off main link after specific vertical line then
panel defect will be exposed.

[How]
Add interface to support turn off main link before specific
vertical line
Reviewed-by: Robin Chen <robin.chen@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Paul Hsieh <paul.hsieh@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c

@@ -35,6 +35,7 @@
 
 static const uint8_t DP_SINK_DEVICE_STR_ID_1[] = {7, 1, 8, 7, 3};
 static const uint8_t DP_SINK_DEVICE_STR_ID_2[] = {7, 1, 8, 7, 5};
+static const uint8_t DP_SINK_DEVICE_STR_ID_3[] = {0x42, 0x61, 0x6c, 0x73, 0x61};
 
 /*
  * Convert dmcub psr state to dmcu psr state.
@@ -295,7 +296,7 @@ static bool dmub_psr_copy_settings(struct dmub_psr *dmub,
 		struct psr_context *psr_context,
 		uint8_t panel_inst)
 {
-	union dmub_rb_cmd cmd;
+	union dmub_rb_cmd cmd = { 0 };
 	struct dc_context *dc = dmub->ctx;
 	struct dmub_cmd_psr_copy_settings_data *copy_settings_data
 		= &cmd.psr_copy_settings.psr_copy_settings_data;
@@ -408,6 +409,13 @@ static bool dmub_psr_copy_settings(struct dmub_psr *dmub,
 	else
 		copy_settings_data->debug.bitfields.force_wakeup_by_tps3 = 0;
 
+	if (link->psr_settings.psr_version == DC_PSR_VERSION_1 &&
+		link->dpcd_caps.sink_dev_id == DP_DEVICE_ID_0022B9 &&
+		!memcmp(link->dpcd_caps.sink_dev_id_str, DP_SINK_DEVICE_STR_ID_3,
+			sizeof(DP_SINK_DEVICE_STR_ID_3))) {
+		copy_settings_data->poweroff_before_vertical_line = 16;
+	}
+
 	//WA for PSR1 on specific TCON, require frame delay for frame re-lock
 	copy_settings_data->relock_delay_frame_cnt = 0;
 	if (link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_001CF8)

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

@@ -2283,9 +2283,9 @@ struct dmub_cmd_psr_copy_settings_data {
 	 */
 	uint16_t dsc_slice_height;
 	/**
-	 * Explicit padding to 4 byte boundary.
+	 * Some panels request main link off before xth vertical line
 	 */
-	uint16_t pad;
+	uint16_t poweroff_before_vertical_line;
 };
 
 /**

drivers/gpu/drm/amd/display/include/ddc_service_types.h

@@ -39,6 +39,7 @@
 #define DP_BRANCH_HW_REV_10 0x10
 #define DP_BRANCH_HW_REV_20 0x20
 
+#define DP_DEVICE_ID_0022B9 0x0022B9
 #define DP_DEVICE_ID_38EC11 0x38EC11
 #define DP_DEVICE_ID_BA4159 0xBA4159
 #define DP_FORCE_PSRSU_CAPABILITY 0x40F