From: Roman Li <Roman.Li@amd.com>
Date: Tue, 25 Jul 2017 14:50:44 -0400
Subject: drm/amd/display: Fix eDP panel light-up
Git-commit: 48841a20fc794cee0dcbcabee64e068bd6db2df7
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Power-down panel on disale only if sink exists
otherwise it fails edid read during init sequence
Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
@@ -114,7 +114,9 @@ void dp_disable_link_phy(struct dc_link
if (signal == SIGNAL_TYPE_EDP) {
link->link_enc->funcs->backlight_control(link->link_enc, false);
- link->link_enc->funcs->power_control(link->link_enc, false);
+ if (link->dpcd_sink_count)
+ link->link_enc->funcs->power_control(link->link_enc,
+ false);
}
link->link_enc->funcs->disable_output(link->link_enc, signal);