Hi,
> > --- a/drivers/gpu/drm/virtio/virtgpu_display.c
> > +++ b/drivers/gpu/drm/virtio/virtgpu_display.c
> > @@ -100,6 +100,7 @@ static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
> > struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
> >
> > output->enabled = true;
> > + output->need_update = true;
> > --- a/drivers/gpu/drm/virtio/virtgpu_plane.c
> > +++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
> > @@ -163,7 +163,8 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
> > plane->state->src_w != old_state->src_w ||
> > plane->state->src_h != old_state->src_h ||
> > plane->state->src_x != old_state->src_x ||
> > - plane->state->src_y != old_state->src_y) {
> > + plane->state->src_y != old_state->src_y ||
> > + output->need_update) {
>
> Uh instead of hand-rolling what's essentially a drm_crtc_needs_modeset
> check, why not use that one? atomic helpers try to keep the usual suspects
> for state transitions already handy, to avoid every driver rolling their
> own. Or do I miss something here?
Well, the virtio-gpu virtual hardware can't do plane updates and crtc
updates independant from each other. So the crtc callbacks handle
disable only (we don't need a fb for that) and leave the enable to the
plane update.
I suspect calling drm_atomic_crtc_needs_modeset() in plane update isn't
going to fly ...
take care,
Gerd
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