On Mon, Aug 26, 2019 at 10:21 PM Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote:
>
> On Mon, Aug 26, 2019 at 03:34:56PM -0700, Chia-I Wu wrote:
> > On Thu, Aug 22, 2019 at 2:47 AM Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote:
> > >
> > > Use drm_atomic_helper_check_plane_state()
> > > to sanity check the plane state.
> > >
> > > Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/virtio/virtgpu_plane.c | 17 ++++++++++++++++-
> > > 1 file changed, 16 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
> > > index a492ac3f4a7e..fe5efb2de90d 100644
> > > --- a/drivers/gpu/drm/virtio/virtgpu_plane.c
> > > +++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
> > > @@ -84,7 +84,22 @@ static const struct drm_plane_funcs virtio_gpu_plane_funcs = {
> > > static int virtio_gpu_plane_atomic_check(struct drm_plane *plane,
> > > struct drm_plane_state *state)
> > > {
> > > - return 0;
> > > + bool is_cursor = plane->type == DRM_PLANE_TYPE_CURSOR;
> > > + struct drm_crtc_state *crtc_state;
> > > + int ret;
> > > +
> > > + if (!state->fb || !state->crtc)
> > > + return 0;
> > > +
> > > + crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
> > > + if (IS_ERR(crtc_state))
> > > + return PTR_ERR(crtc_state);
> > Is drm_atomic_get_new_crtc_state better here?
>
> We don't have to worry about old/new state here. The drm_plane_state we
> get passed is the state we should check in this callback (and I think
> this always is the new state).
Acked-by: Chia-I Wu <olvaffe@xxxxxxxxx> (because I am not familiar
with the atomic code to give an r-b)
>
> cheers,
> Gerd
>
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