Hello,
On 3/13/19 9:20 PM, Helen Koike wrote:
> Async update callbacks are expected to set the old_fb in the new_state
> so prepare/cleanup framebuffers are balanced.
>
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.14+
> Fixes: 224a4c970987 ("drm/msm: update cursors asynchronously through atomic")
> Suggested-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> Signed-off-by: Helen Koike <helen.koike@xxxxxxxxxxxxx>
>
> ---
> Hello,
>
> As mentioned in the cover letter,
> But I couldn't test on MSM because I don't have the hardware and I would
> appreciate if anyone could test it.
I got this tested on a dragonboard 410c, no regressions where found and
no extra warnings.
These two tests where already failing for other reasons:
flip-vs-cursor-crc-atomic
flip-vs-cursor-crc-legacy
If you want to see the full log:
https://people.collabora.com/~koike/drm-fixes-results.zip
Thanks
Helen
>
> 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
>
> Changes in v3: None
> Changes in v2:
> - update CC stable and Fixes tag
>
> 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 = {
>
