This is a note to let you know that I've just added the patch titled
drm/i915: Don't zero out the Y plane's watermarks
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-don-t-zero-out-the-y-plane-s-watermarks.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bf52dc49ba0101f648b4c3ea26b812061406b0d4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Sat, 27 Mar 2021 02:59:45 +0200
Subject: drm/i915: Don't zero out the Y plane's watermarks
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit bf52dc49ba0101f648b4c3ea26b812061406b0d4 upstream.
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@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>
Link: https://patchwork.freedesktop.org/patch/msgid/20210327005945.4929-1-ville.syrjala@xxxxxxxxxxxxxxx
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
(cherry picked from commit f99b805fb9413ff007ca0b6add871737664117dd)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5539,12 +5539,12 @@ static int icl_build_plane_wm(struct int
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;
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-5.11/drm-i915-don-t-zero-out-the-y-plane-s-watermarks.patch
