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Date:   Mon,  4 Mar 2019 11:49:09 -0300
From:   Helen Koike <>
Cc:,,, Tomasz Figa <>,, David Airlie <>,
        Sean Paul <>,,,
        St├ęphane Marchesin <>
Subject: [PATCH 5/5] drm/vc4: fix fb references in async update

Async update callbacks are expected to set the old_fb in the new_state
so prepare/cleanup framebuffers are balanced.

Calling drm_atomic_set_fb_for_plane() (which gets a reference of the new
fb and put the old fb) is not required, as it's taken care by
drm_mode_cursor_universal() when calling drm_atomic_helper_update_plane().

Cc: <> # v4.19+: 25dc194b34dd: drm: Block fb changes for async plane updates
Cc: <> # v4.19+: 8105bbaf9afd: drm: don't block fb changes for async plane updates
Fixes: 25dc194b34dd ("drm: Block fb changes for async plane updates")
Suggested-by: Boris Brezillon <>
Signed-off-by: Helen Koike <>


As mentioned in the cover letter,
I tested on the rockchip and on i915 using igt plane_cursor_legacy and
kms_cursor_legacy and I didn't see any regressions.
But I couldn't test on VC4. I have a Raspberry pi model B rev2, when
FB_SIMPLE is running I can see output on the screen, but when vc4 is
loaded my hdmi display is not detected anymore, I am still debugging
this, probably some config in the firmware, but I would appreciate if
anyone could help me testing it.

Also the Cc statble commit hash dependency needs to be updated once the
refered commit is merged.


 drivers/gpu/drm/vc4/vc4_plane.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 1babfeca0c92..1235e53b22a3 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -968,7 +968,7 @@ static void vc4_plane_atomic_async_update(struct drm_plane *plane,
 	struct vc4_plane_state *vc4_state, *new_vc4_state;
-	drm_atomic_set_fb_for_plane(plane->state, state->fb);
+	swap(plane->state->fb, state->fb);
 	plane->state->crtc_x = state->crtc_x;
 	plane->state->crtc_y = state->crtc_y;
 	plane->state->crtc_w = state->crtc_w;

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