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drm/amd/display: pass the right num of modes added

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[why]
In case if edid is null or corrupted we need to manually add
a single failsafe mode (640x480). If zero modes returned
DRM adds a different failsafe mode that is not accepted by
DP 1.2 compliance test

[how]
Return the number of modes manually added

Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mikita Lipski 2018-07-26 16:27:48 -04:00 committed by Alex Deucher
parent 2cddc50e98
commit 1b369d3c0d
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -3468,7 +3468,8 @@ static int amdgpu_dm_connector_get_modes(struct drm_connector *connector)
encoder = helper->best_encoder(connector);
if (!edid || !drm_edid_is_valid(edid)) {
drm_add_modes_noedid(connector, 640, 480);
amdgpu_dm_connector->num_modes =
drm_add_modes_noedid(connector, 640, 480);
} else {
amdgpu_dm_connector_ddc_get_modes(connector, edid);
amdgpu_dm_connector_add_common_modes(encoder, connector);