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drm/amd/display: Fix mem_type change detection for async flips

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[Why]
amdgpu_dm_crtc_mem_type_changed() fetches the "old" and "new" plane state
with two drm_atomic_get_plane_state() calls, which both return the new
state. It compares a state against itself, so it never detects a mem_type
change and never rejects the async flip.

On DCN 3.0.1, this shows up as intermittent corruption when a single DCC
plane is scanned out with immediate flips under gamescope and its buffer
moves between the VRAM carveout and GTT.

[How]
Use drm_atomic_get_old_plane_state() and drm_atomic_get_new_plane_state()
to compare the actual old and new states. These return NULL rather than
an error pointer for a plane that is not part of the commit, so the
IS_ERR() check becomes a NULL check that skips those planes, such as an
unmodified cursor still in the CRTC's plane_mask.

Fixes: 4caacd1671 ("drm/amd/display: Do not elevate mem_type change to full update")
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Matthew Schwartz <matthew.schwartz@linux.dev>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 13158e5dbd896281f3e9982b5437cffa5fd621b2)
This commit is contained in:
Matthew Schwartz 2026-06-11 08:44:38 -07:00 committed by Alex Deucher
parent 40f9e2f514
commit 8e792f018e
1 changed files with 4 additions and 6 deletions
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10
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -12938,13 +12938,11 @@ static bool amdgpu_dm_crtc_mem_type_changed(struct drm_device *dev,
struct drm_plane_state *new_plane_state, *old_plane_state;
drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
new_plane_state = drm_atomic_get_plane_state(state, plane);
old_plane_state = drm_atomic_get_plane_state(state, plane);
new_plane_state = drm_atomic_get_new_plane_state(state, plane);
old_plane_state = drm_atomic_get_old_plane_state(state, plane);
if (IS_ERR(new_plane_state) || IS_ERR(old_plane_state)) {
drm_err(dev, "Failed to get plane state for plane %s\n", plane->name);
return false;
}
if (!old_plane_state || !new_plane_state)
continue;
if (old_plane_state->fb && new_plane_state->fb &&
get_mem_type(old_plane_state->fb) != get_mem_type(new_plane_state->fb))