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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: Roman Li <roman.li@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello 2025-06-02 23:14:51 -05:00 committed by Alex Deucher
parent 9a1550b6f3
commit 978fa2f6d0
1 changed files with 16 additions and 0 deletions
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16
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -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;