From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Don't zero out the watermarks for the Y plane since we've already
computed them when computing the UV plane's watermarks (since the
UV plane always appears before ethe Y plane when iterating through
the planes).
This leads to allocating no DDB for the Y plane since .min_ddb_alloc
also gets zeroed. And that of course leads to underruns when scanning
out planar formats.
We really need to re-enable the pre-merge pixel format tests or else
I'll just keep breaking this stuff...
Cc: stable@xxxxxxxxxxxxxxx
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Fixes: dbf71381d733 ("drm/i915: Nuke intel_atomic_crtc_state_for_each_plane_state() from skl+ wm code")
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index b2aede2be89d..49c19acdb7c6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5511,12 +5511,12 @@ static int icl_build_plane_wm(struct intel_crtc_state *crtc_state,
struct skl_plane_wm *wm = &crtc_state->wm.skl.raw.planes[plane_id];
int ret;
- memset(wm, 0, sizeof(*wm));
-
/* Watermarks calculated in master */
if (plane_state->planar_slave)
return 0;
+ memset(wm, 0, sizeof(*wm));
+
if (plane_state->planar_linked_plane) {
const struct drm_framebuffer *fb = plane_state->hw.fb;
enum plane_id y_plane_id = plane_state->planar_linked_plane->id;
--
2.26.2
