Commit b58f0c81 authored by Shirish S's avatar Shirish S Committed by Alex Deucher

drm/amd/display: disable CRTCs with NULL FB on their primary plane (V2)

The below commit

"drm/atomic: Try to preserve the crtc enabled state in drm_atomic_remove_fb, v2"

introduces a slight behavioral change to rmfb. Instead of disabling a crtc
when the primary plane is disabled, it now preserves it.

This change leads to BUG hit while performing atomic commit on amd driver.

As a fix this patch ensures that we disable the CRTC's with NULL FB by returning
-EINVAL and hence triggering fall back to the old behavior and turning off the
crtc in atomic_remove_fb().

V2: Added error check for plane_state and removed sanity check for crtc.
Signed-off-by: default avatarShirish S <shirish.s@amd.com>
Signed-off-by: default avatarPratik Vishwakarma <Pratik.Vishwakarma@amd.com>
Reviewed-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 16a6620c
......@@ -4796,6 +4796,30 @@ static int dm_update_planes_state(struct dc *dc,
return ret;
}
static int dm_atomic_check_plane_state_fb(struct drm_atomic_state *state,
struct drm_crtc *crtc)
{
struct drm_plane *plane;
struct drm_crtc_state *crtc_state;
WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc));
drm_for_each_plane_mask(plane, state->dev, crtc->state->plane_mask) {
struct drm_plane_state *plane_state =
drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state))
return -EDEADLK;
crtc_state = drm_atomic_get_crtc_state(plane_state->state, crtc);
if (crtc->primary == plane && crtc_state->active) {
if (!plane_state->fb)
return -EINVAL;
}
}
return 0;
}
static int amdgpu_dm_atomic_check(struct drm_device *dev,
struct drm_atomic_state *state)
{
......@@ -4819,6 +4843,10 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
goto fail;
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
ret = dm_atomic_check_plane_state_fb(state, crtc);
if (ret)
goto fail;
if (!drm_atomic_crtc_needs_modeset(new_crtc_state) &&
!new_crtc_state->color_mgmt_changed)
continue;
......
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