On Mon, Jun 22, 2020 at 11:20 PM Tomasz Figa <tfiga@xxxxxxxxxxxx> wrote:
>
> Hi Hsin-Yi,
>
> On Mon, Jun 22, 2020 at 11:01:09PM +0800, Hsin-Yi Wang wrote:
> > Disable the plane if it's not visible. Otherwise mtk_ovl_layer_config()
> > would proceed with invalid plane and we may see vblank timeout.
> >
> > Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.")
> > Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
> > Reviewed-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx>
> > ---
> > v2: Add fixes tag
> > ---
> > drivers/gpu/drm/mediatek/mtk_drm_plane.c | 23 +++++++++++++----------
> > 1 file changed, 13 insertions(+), 10 deletions(-)
> >
>
> Thank you for the patch. Please see my comments inline.
>
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> > index c2bd683a87c8..74dc71c7f3b6 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> > @@ -164,6 +164,16 @@ static int mtk_plane_atomic_check(struct drm_plane *plane,
> > true, true);
> > }
> >
> > +static void mtk_plane_atomic_disable(struct drm_plane *plane,
> > + struct drm_plane_state *old_state)
> > +{
> > + struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
> > +
> > + state->pending.enable = false;
> > + wmb(); /* Make sure the above parameter is set before update */
> > + state->pending.dirty = true;
> > +}
> > +
> > static void mtk_plane_atomic_update(struct drm_plane *plane,
> > struct drm_plane_state *old_state)
> > {
> > @@ -178,6 +188,9 @@ static void mtk_plane_atomic_update(struct drm_plane *plane,
> > if (!crtc || WARN_ON(!fb))
> > return;
> >
> > + if (!plane->state->visible)
> > + return mtk_plane_atomic_disable(plane, old_state);
>
> nit: Both this function and mtk_plane_atomic_disable() have the void return
> type. Perhaps we should rather move the return, without a value, to a
> separate statement?
Updated in v3, thanks.
>
> Best regards,
> Tomasz
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