Commit 013cce49 authored by Martin Tsai's avatar Martin Tsai Committed by Alex Deucher
Browse files

drm/amd/display: Force delay after DP receive power up 



[Why]
Some sprcified monitor scalar cannot recognize timing
change on demand. Once the link phy disable and enable
during a short period then the Sink protection mechanism
could keep the screen in blank and cannot be recoverred.

[How]
To add 100ms delay between enable link phy and link training.

Signed-off-by: default avatarMartin Tsai <martin.tsai@amd.com>
Reviewed-by: default avatarAric Cyr <Aric.Cyr@amd.com>
Acked-by: default avatarQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent c69553eb

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

+4 −3
Original line number Diff line number Diff line
@@ -1559,9 +1559,10 @@ bool perform_link_training_with_retries( 
			pipe_ctx->clock_source->id,

			link_setting);



		if (stream->sink_patches.dppowerup_delay > 0) {

			int delay_dp_power_up_in_ms = stream->sink_patches.dppowerup_delay;



		if ((link && link->dc->debug.dppowerup_delay > 0) || stream->sink_patches.dppowerup_delay > 0) {

			int delay_dp_power_up_in_ms =

				(link->dc->debug.dppowerup_delay >= stream->sink_patches.dppowerup_delay) ?

				link->dc->debug.dppowerup_delay : stream->sink_patches.dppowerup_delay;

			msleep(delay_dp_power_up_in_ms);

		}

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

+1 −0
Original line number Diff line number Diff line
@@ -498,6 +498,7 @@ struct dc_debug_options { 
	bool usbc_combo_phy_reset_wa;

	bool disable_dsc;

	bool enable_dram_clock_change_one_display_vactive;

	unsigned int dppowerup_delay;

};



struct dc_debug_data {