Commit 0d93e821 authored Mar 26, 2025 by Charlene Liu Committed by Alex Deucher Apr 07, 2025

drm/amd/display: turn off eDP lcdvdd and backlight if not required



[why]
A+N configuration, eDP on A-APU is off, extended display active.
Resume from s4, eDP's backlight is still on.

[how]
Turn off inactive eDP backlight and lcdvdd.

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Jing Zhou <Jing.Zhou@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 32be4e39

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

+2 −2

Original line number	Diff line number	Diff line
		@@ -6298,10 +6298,10 @@ void dc_query_current_properties(struct dc dc, struct dc_current_properties pr
		void dc_set_edp_power(const struct dc dc, struct dc_link edp_link,
		bool powerOn)
		{
		if (edp_link->connector_signal != SIGNAL_TYPE_EDP)
		if (!edp_link \|\| !edp_link->dc \|\| !edp_link->dc->link_srv)
		return;

		if (edp_link->skip_implict_edp_power_control == false)
		if (edp_link->connector_signal != SIGNAL_TYPE_EDP)
		return;

		edp_link->dc->link_srv->edp_set_panel_power(edp_link, powerOn);

drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -393,6 +393,7 @@ void edp_set_panel_power(struct dc_link *link, bool powerOn)

		// 3. Rx power on
		dpcd_write_rx_power_ctrl(link, true);
		DC_LOG_BACKLIGHT("eDP power and backlight: Power on");
		} else {
		// 3. Rx power off
		dpcd_write_rx_power_ctrl(link, false);
		@@ -404,6 +405,7 @@ void edp_set_panel_power(struct dc_link *link, bool powerOn)
		// 1. panel VDD off
		if (!link->dc->config.edp_no_power_sequencing)
		link->dc->hwss.edp_power_control(link, false);
		DC_LOG_BACKLIGHT("eDP power and backlight: Power off");
		}
		}