drm/amd/display: Add extra T3 delay

[Why]
For some special panel, it will have an invalid HPD high cause driver
DPCD read/write fail.

[How]
Add extra T3 delay as a monitor patch in dce110_edp_wait_for_hpd_ready
Signed-off-by: Lewis Huang <Lewis.Huang@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -233,6 +233,7 @@ struct dc_panel_patch {
 	unsigned int skip_scdc_overwrite;
 	unsigned int delay_ignore_msa;
 	unsigned int disable_fec;
+	unsigned int extra_t3_ms;
 };
 
 struct dc_edid_caps {

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -720,6 +720,7 @@ void dce110_edp_wait_for_hpd_ready(
 	struct dc_context *ctx = link->ctx;
 	struct graphics_object_id connector = link->link_enc->connector;
 	struct gpio *hpd;
+	struct dc_sink *sink = link->local_sink;
 	bool edp_hpd_high = false;
 	uint32_t time_elapsed = 0;
 	uint32_t timeout = power_up ?
@@ -752,6 +753,14 @@ void dce110_edp_wait_for_hpd_ready(
 		return;
 	}
 
+	if (sink != NULL) {
+		if (sink->edid_caps.panel_patch.extra_t3_ms > 0) {
+			int extra_t3_in_ms = sink->edid_caps.panel_patch.extra_t3_ms;
+
+			msleep(extra_t3_in_ms);
+		}
+	}
+
 	dal_gpio_open(hpd, GPIO_MODE_INTERRUPT);
 
 	/* wait until timeout or panel detected */