From: Gerd Hoffmann <kraxel@redhat.com>
To: dri-devel@lists.freedesktop.org, 1882851@bugs.launchpad.net,
David Airlie <airlied@linux.ie>, Chia-I Wu <olvaffe@gmail.com>,
"open list:VIRTIO GPU DRIVER"
<virtualization@lists.linux-foundation.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] drm/virtio: fix unblank
Date: Mon, 17 Aug 2020 12:19:25 +0200 [thread overview]
Message-ID: <20200817101925.ljpfgz336zxegsup@sirius.home.kraxel.org> (raw)
In-Reply-To: <20200817090342.bemmtkvz4seayp2i@sirius.home.kraxel.org>
On Mon, Aug 17, 2020 at 11:03:42AM +0200, Gerd Hoffmann wrote:
> 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 ...
Digged a bit more, seems crtc_state->*_changed is cleared after modeset
so the following plane update wouldn't see it. Which I think means
there is no way around tracking that in need_update.
output->enabled is probably not needed though, seems I can replace that
by either output->crtc.state->enable or ->active. Not fully sure which
one, probably ->active.
take care,
Gerd
next prev parent reply other threads:[~2020-08-17 10:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-07 10:54 [PATCH] drm/virtio: fix unblank Gerd Hoffmann
2020-08-07 13:09 ` Daniel Vetter
2020-08-17 9:03 ` Gerd Hoffmann
2020-08-17 10:19 ` Gerd Hoffmann [this message]
[not found] <20200818072511.6745-1-kraxel@redhat.com>
2020-08-25 21:56 ` Diego Viola
-- strict thread matches above, loose matches on Subject: below --
2020-06-12 11:13 Gerd Hoffmann
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