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From 8e1f70ea4c72baf779892545e329971ad5261d77 Mon Sep 17 00:00:00 2001
From: Roman Li <Roman.Li@amd.com>
Date: Tue, 25 Jul 2017 14:50:44 -0400
Subject: [PATCH 0671/4131] drm/amd/display: Fix eDP panel light-up
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>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
index aac2420..5bdcd50 100644
--- 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 *link, enum signal_type signal)
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);
--
2.7.4
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