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drm/amd/display: Disable common modes for LVDS

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[Why]
Common modes are added to LVDS for compatibility in clone mode, but
not all panels support them.  Non-native modes were disabled in the past
but this caused problems because compositors didn't use scaling for non
native modes. Now non-native modes on LVDS will enable the scaler by
default.

[How]
Check the connector type.  If the connector is LVDS avoid adding common
modes.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2025-07-01 16:09:19 -04:00
parent 0c3c2e334c
commit 6d396e7ac1
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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@@ -8374,7 +8374,8 @@ static int amdgpu_dm_connector_get_modes(struct drm_connector *connector)
drm_add_modes_noedid(connector, 1920, 1080);
} else {
amdgpu_dm_connector_ddc_get_modes(connector, drm_edid);
if (encoder && connector->connector_type != DRM_MODE_CONNECTOR_eDP)
if (encoder && (connector->connector_type != DRM_MODE_CONNECTOR_eDP) &&
(connector->connector_type != DRM_MODE_CONNECTOR_LVDS))
amdgpu_dm_connector_add_common_modes(encoder, connector);
amdgpu_dm_connector_add_freesync_modes(connector, drm_edid);
}