drm/i915: Don't zero out the Y plane's watermarks

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.

Cc: stable@vger.kernel.org
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Fixes: dbf71381d733 ("drm/i915: Nuke intel_atomic_crtc_state_for_each_plane_state() from skl+ wm code")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210327005945.4929-1-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 32f301c..3ecbd62 100644 (file)
--- 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;