[PATCH] drm/amd/display: Only require EDID read for HDMI and DVI

[Harry Wentland]

[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 at amd.com>
Suggested-by: Michel Dänzer <michel at daenzer.net>
---
 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 d6086c591f75..71b94e3b472e 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;
-- 
2.17.1