Commit 978fa2f6 authored by Mario Limonciello's avatar Mario Limonciello Committed by Alex Deucher
Browse files

drm/amd/display: Use scaling for non-native resolutions on eDP 



[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 eDP panel turn the scaler on anyway.  This will ensure
compatibility.

Reviewed-by: default avatarRoman Li <roman.li@amd.com>
Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarAurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 9a1550b6

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

+16 −0
Original line number Diff line number Diff line
@@ -7891,6 +7891,22 @@ 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) {

		struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);

		struct drm_display_mode *native_mode = &amdgpu_encoder->native_mode;

		enum drm_mode_status result;



		result = drm_crtc_helper_mode_valid_fixed(encoder->crtc, adjusted_mode, native_mode);

		if (result != MODE_OK && dm_new_connector_state->scaling == RMX_OFF) {

			drm_dbg_driver(encoder->dev,

				       "mode %dx%d@%dHz is not native, enabling scaling\n",

				       adjusted_mode->hdisplay, adjusted_mode->vdisplay,

				       drm_mode_vrefresh(adjusted_mode));

			dm_new_connector_state->scaling = RMX_FULL;

		}

		return 0;

	}



	if (!aconnector->mst_output_port)

		return 0;