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drm/amd/display: check fb of primary plane

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Sometimes the primary plane might not be initialized (yet), which
causes dm_check_crtc_cursor to divide by zero.
Apparently a weird state before a S3-suspend causes the aforementioned
divide-by-zero error when resuming from S3.  This was explained in
bug 212293 on Bugzilla.

To avoid this divide-by-zero error we check if the primary plane's fb
isn't NULL.  If it's NULL the src_w and src_h attributes will be 0,
which would cause a divide-by-zero.

This fixes Bugzilla report 212293
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=212293

Fixes: 12f4849a1c ("drm/amd/display: check cursor scaling")
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Sefa Eyeoglu
2021-03-16 22:50:06 +01:00
committed by Alex Deucher
parent 5af50b0b1c
commit 7df4ceb60f
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -9765,7 +9765,8 @@ static int dm_check_crtc_cursor(struct drm_atomic_state *state,
new_cursor_state = drm_atomic_get_new_plane_state(state, crtc->cursor);
new_primary_state = drm_atomic_get_new_plane_state(state, crtc->primary);
if (!new_cursor_state || !new_primary_state || !new_cursor_state->fb) {
if (!new_cursor_state || !new_primary_state ||
!new_cursor_state->fb || !new_primary_state->fb) {
return 0;
}