Async update callbacks are expected to set the old_fb in the new_state
so prepare/cleanup framebuffers are balanced.
Cc: <sta...@vger.kernel.org> # v4.14+: 25dc194b34dd: drm: Block fb changes for
async plane updates
Cc: <sta...@vger.kernel.org> # v4.14+: 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 <boris.brezil...@collabora.com>
Signed-off-by: Helen Koike <helen.ko...@collabora.com>
---
Hello,
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 MSM because I don't have the hardware and I would
appreciate if anyone could test it.
In other platforms (VC4, AMD, Rockchip), there is a hidden
drm_framebuffer_get(new_fb)/drm_framebuffer_put(old_fb) in async_update
that is wrong, but I couldn't identify those here, not sure if it is hidden
somewhere else, but if tests fail this is probably the cause.
Thanks!
Helen
drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
index be13140967b4..b854f471e9e5 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
@@ -502,6 +502,8 @@ static int mdp5_plane_atomic_async_check(struct drm_plane
*plane,
static void mdp5_plane_atomic_async_update(struct drm_plane *plane,
struct drm_plane_state *new_state)
{
+ struct drm_framebuffer *old_fb = plane->state->fb;
+
plane->state->src_x = new_state->src_x;
plane->state->src_y = new_state->src_y;
plane->state->crtc_x = new_state->crtc_x;
@@ -524,6 +526,8 @@ static void mdp5_plane_atomic_async_update(struct drm_plane
*plane,
*to_mdp5_plane_state(plane->state) =
*to_mdp5_plane_state(new_state);
+
+ new_state->fb = old_fb;
}
static const struct drm_plane_helper_funcs mdp5_plane_helper_funcs = {
--
2.20.1
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