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drm/i915: Unconditionally clear plane visibility, v2. 

We need to assume the plane has been visible before, even if no CRTC
is assigned to the plane. This is because when enabling a nv12 plane
on gen11, we will have to enable an extra plane and make it visible
by marking it in crtc_state->active_planes for
intel_update_planes_on_crtc().

Additionally, clear visible flag in intel_plane_atomic_check, in case
we ever hit a bug with visibility. Our code implicitly assumes that
plane_state->visible is only true when crtc and fb are set,
so we will either null deref in intel_fbc_choose_crtc() or
do something bad during the actual commit which cares even more.

Changes since v1:
- Unconditionally clear crtc_state->active_planes as well.
- Reword commit message, since this is now a preparation patch for
  NV12 Y / UV plane linking.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[mlankhorst: Clear nv12_planes in the beginning as well, clarify commit message]
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180920102711.4184-4-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2018-09-20 12:27:06 +02:00
parent c249c5f643
commit 62ef0dd3cc
1 changed files with 6 additions and 5 deletions
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11
drivers/gpu/drm/i915/intel_atomic_plane.c
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@ -117,10 +117,14 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
struct intel_plane *intel_plane = to_intel_plane(plane);
int ret;
crtc_state->active_planes &= ~BIT(intel_plane->id);
crtc_state->nv12_planes &= ~BIT(intel_plane->id);
intel_state->base.visible = false;
/* If this is a cursor plane, no further checks are needed. */
if (!intel_state->base.crtc && !old_plane_state->base.crtc)
return 0;
intel_state->base.visible = false;
ret = intel_plane->check_plane(crtc_state, intel_state);
if (ret)
return ret;
@ -128,13 +132,9 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
/* FIXME pre-g4x don't work like this */
if (state->visible)
crtc_state->active_planes |= BIT(intel_plane->id);
else
crtc_state->active_planes &= ~BIT(intel_plane->id);
if (state->visible && state->fb->format->format == DRM_FORMAT_NV12)
crtc_state->nv12_planes |= BIT(intel_plane->id);
else
crtc_state->nv12_planes &= ~BIT(intel_plane->id);
return intel_plane_atomic_calc_changes(old_crtc_state,
&crtc_state->base,
@ -152,6 +152,7 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
const struct drm_crtc_state *old_crtc_state;
struct drm_crtc_state *new_crtc_state;
new_plane_state->visible = false;
if (!crtc)
return 0;