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drm/amd/display: Fix writeback on DCN 3.2+ 

[ Upstream commit 9ef84a307582a92ef055ef0bd3db10fd8ac75960 ]

[WHAT]
1. Set no scaling for writeback as they are hardcoded in DCN3.2+.
2. Set no fast plane update for writeback commits.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Hung 2026-01-14 17:20:31 -07:00 committed by Sasha Levin
parent b7af28b96d
commit dce5da49f6
1 changed files with 15 additions and 4 deletions
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19
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -10411,10 +10411,10 @@ static void dm_set_writeback(struct amdgpu_display_manager *dm,
wb_info->dwb_params.capture_rate = dwb_capture_rate_0;
wb_info->dwb_params.scaler_taps.h_taps = 4;
wb_info->dwb_params.scaler_taps.v_taps = 4;
wb_info->dwb_params.scaler_taps.h_taps_c = 2;
wb_info->dwb_params.scaler_taps.v_taps_c = 2;
wb_info->dwb_params.scaler_taps.h_taps = 1;
wb_info->dwb_params.scaler_taps.v_taps = 1;
wb_info->dwb_params.scaler_taps.h_taps_c = 1;
wb_info->dwb_params.scaler_taps.v_taps_c = 1;
wb_info->dwb_params.subsample_position = DWB_INTERSTITIAL_SUBSAMPLING;
wb_info->mcif_buf_params.luma_pitch = afb->base.pitches[0];
@ -11430,6 +11430,8 @@ static bool should_reset_plane(struct drm_atomic_state *state,
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
struct dm_crtc_state *old_dm_crtc_state, *new_dm_crtc_state;
struct amdgpu_device *adev = drm_to_adev(plane->dev);
struct drm_connector_state *new_con_state;
struct drm_connector *connector;
int i;
/*
@ -11440,6 +11442,15 @@ static bool should_reset_plane(struct drm_atomic_state *state,
state->allow_modeset)
return true;
/* Check for writeback commit */
for_each_new_connector_in_state(state, connector, new_con_state, i) {
if (connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
continue;
if (new_con_state->writeback_job)
return true;
}
if (amdgpu_in_reset(adev) && state->allow_modeset)
return true;