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From 499b11527b5dc07df496e3533ae217b8992b2275 Mon Sep 17 00:00:00 2001
From: Harry Wentland <harry.wentland@amd.com>
Date: Thu, 2 Aug 2018 15:32:01 -0400
Subject: [PATCH 5039/5725] drm/amd/display: Only require EDID read for HDMI
and DVI
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
[Why]
VGA sometimes has trouble retrieving the EDID on very long cables, KVM
switches, or old displays.
[How]
Only require EDID read for HDMI and DVI and exempt other types (DP,
VGA). We currently don't support VGA but if anyone adds support in the
future this might get overlooked.
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Suggested-by: Michel Dänzer <michel@daenzer.net>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index cbfb1ae..048b8c8 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -753,7 +753,8 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
* even if we have no EDID in order to go to
* fail-safe mode
*/
- if (!dc_is_dp_signal(link->connector_signal))
+ if (dc_is_hdmi_signal(link->connector_signal) ||
+ dc_is_dvi_signal(link->connector_signal))
return false;
default:
break;
--
2.7.4
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