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From 022bc228b3719d912336445cce84c28385806f45 Mon Sep 17 00:00:00 2001
From: Mikita Lipski <mikita.lipski@amd.com>
Date: Tue, 22 May 2018 15:55:43 -0400
Subject: [PATCH 4731/5725] drm/amd/display: Drop to fail-safe mode if edid is
bad
Provide the connector with a single fail-safe mode of 640x480 for CTS
tests instead of providing a list of possible base modes.
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 2aa0041..8bc6736 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3798,6 +3798,10 @@ static int amdgpu_dm_connector_get_modes(struct drm_connector *connector)
struct edid *edid = amdgpu_dm_connector->edid;
encoder = helper->best_encoder(connector);
+
+ if (!edid || !drm_edid_is_valid(edid))
+ return drm_add_modes_noedid(connector, 640, 480);
+
amdgpu_dm_connector_ddc_get_modes(connector, edid);
amdgpu_dm_connector_add_common_modes(encoder, connector);
--
2.7.4
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