diff options
| author | Leo Li <sunpeng.li@amd.com> | 2024-09-05 18:45:04 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2024-09-10 11:52:23 -0400 |
| commit | 578aab4ecc73476393389440724b7a391cc0cea9 (patch) | |
| tree | 79692b4725727a4bb8d426ee65dc37af001c0d0d /drivers | |
| parent | 0df8ef6e1b5dc7a6edc6242a95f47a257ffecff0 (diff) | |
| download | linux-stable-578aab4ecc73476393389440724b7a391cc0cea9.tar.gz linux-stable-578aab4ecc73476393389440724b7a391cc0cea9.tar.bz2 linux-stable-578aab4ecc73476393389440724b7a391cc0cea9.zip | |
drm/amd/display: Do not reset planes based on crtc zpos_changed
[Why]
drm_normalize_zpos will set the crtc_state->zpos_changed to 1 if any of
it's assigned planes changes zpos, or is removed/added from it.
To have amdgpu_dm request a plane reset on this is too broad. For
example, if only the cursor plane was moved from one crtc to another,
the crtc's zpos_changed will be set to true. But that does not mean that
the underlying primary plane requires a reset.
[How]
Narrow it down so that only the plane that has a change in zpos will
require a reset.
As a future TODO, we can further optimize this by only requiring a reset
on z-order change. Z-order is different from z-pos, since a zpos change
doesn't necessarily mean the z-ordering changed, and DC should only
require a reset if the z-ordering changed.
For example, the following zpos update does not change z-ordering:
Plane A: zpos 2 -> 3
Plane B: zpos 1 -> 2
=> Plane A is still on top of plane B: no reset needed
Whereas this one does change z-ordering:
Plane A: zpos 2 -> 1
Plane B: zpos 1 -> 2
=> Plane A changed from on top, to below plane B: reset needed
Fixes: 38e0c3df6dbd ("drm/amd/display: Move PRIMARY plane zpos higher")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3569
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 |
1 files changed, 1 insertions, 1 deletions
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 ae293ca69809..2a2b789917fc 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -10561,7 +10561,7 @@ static bool should_reset_plane(struct drm_atomic_state *state, * TODO: We can likely skip bandwidth validation if the only thing that * changed about the plane was it'z z-ordering. */ - if (new_crtc_state->zpos_changed) + if (old_plane_state->normalized_zpos != new_plane_state->normalized_zpos) return true; if (drm_atomic_crtc_needs_modeset(new_crtc_state)) |