Commit 6798d042 authored by Lewis Huang's avatar Lewis Huang Committed by Alex Deucher
Browse files

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: default avatarLewis Huang <Lewis.Huang@amd.com>
Reviewed-by: default avatarAnthony Koo <Anthony.Koo@amd.com>
Acked-by: default avatarRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent bcc6aa61

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

+1 −0
Original line number Diff line number Diff line
@@ -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

+9 −0
Original line number Diff line number Diff line
@@ -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 */