[PATCH 2/2] drm/amd/display: Use scaling for non-native resolutions on LVDS

[Harry Wentland]

On 2025-07-01 16:14, Alex Deucher wrote:
> [Why]
> Common resolutions are added to supported modes to enable compatibility
> scenarios that compositors may use to do things like clone displays. There
> is no guarantee however that the panel will natively support these modes.
> 
> [How]
> If the compositor hasn't enabled scaling but a non-native resolution has
> been picked for an LVDS panel turn the scaler on anyway.  This will ensure
> compatibility.
> 
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

Series is
Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> 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 7a4fca9a61bbe..096b23ad4845d 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -7901,7 +7901,8 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
>  	int clock, bpp = 0;
>  	bool is_y420 = false;
>  
> -	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> +	if ((connector->connector_type == DRM_MODE_CONNECTOR_eDP) ||
> +	    (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)) {
>  		struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
>  		struct drm_display_mode *native_mode = &amdgpu_encoder->native_mode;
>  		enum drm_mode_status result;