[Nouveau] [PATCH 1/4] drm/atomic: Save flip flags in drm_plane_state

[Cheng, Tony]

> -----Original Message-----
> From: dri-devel [mailto:dri-devel-bounces at lists.freedesktop.org] On Behalf
> Of Daniel Vetter
> Sent: Monday, January 23, 2017 3:55 AM
> To: Grodzovsky, Andrey <Andrey.Grodzovsky at amd.com>
> Cc: Deucher, Alexander <Alexander.Deucher at amd.com>;
> nouveau at lists.freedesktop.org; amd-gfx at lists.freedesktop.org; dri-
> devel at lists.freedesktop.org; daniel.vetter at intel.com
> Subject: Re: [PATCH 1/4] drm/atomic: Save flip flags in drm_plane_state
> 
> On Mon, Jan 16, 2017 at 10:44:55AM -0500, Andrey Grodzovsky wrote:
> > Allows using atomic flip helpers for drivers using ASYNC flip.
> > Remove ASYNC_FLIP restriction in helpers and caches the page flip
> > flags in drm_plane_state to be used in the low level drivers.
> >
> > Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>
> 
> It's mostly guesswork, but I think we should have the flip flags in the crtc, not
> in each plane. Similar to how we move the event from planes to crtc.
> -Daniel

What does ASYNC flip mean?  HW flip as soon as possible and result in tearing on screen?  If so I could imaging some use case where you have some UI control/menu overlay on top, and some game running on a underlay plane, and the game want to be able to flip as soon as possible.  Or Daniel do you think ASYNC property will apply to all planes in CRTC?

> 
> > ---
> >  drivers/gpu/drm/drm_atomic_helper.c | 10 +++-------
> >  include/drm/drm_plane.h             |  8 ++++++++
> >  2 files changed, 11 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> > b/drivers/gpu/drm/drm_atomic_helper.c
> > index a4e5477..f83dc43 100644
> > --- a/drivers/gpu/drm/drm_atomic_helper.c
> > +++ b/drivers/gpu/drm/drm_atomic_helper.c
> > @@ -2737,7 +2737,8 @@ static int page_flip_common(
> >  				struct drm_atomic_state *state,
> >  				struct drm_crtc *crtc,
> >  				struct drm_framebuffer *fb,
> > -				struct drm_pending_vblank_event *event)
> > +				struct drm_pending_vblank_event *event,
> > +				uint32_t flags)
> >  {
> >  	struct drm_plane *plane = crtc->primary;
> >  	struct drm_plane_state *plane_state; @@ -2754,6 +2755,7 @@ static
> > int page_flip_common(
> >  	if (IS_ERR(plane_state))
> >  		return PTR_ERR(plane_state);
> >
> > +	plane_state->pflip_flags = flags;
> >
> >  	ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
> >  	if (ret != 0)
> > @@ -2800,9 +2802,6 @@ int drm_atomic_helper_page_flip(struct drm_crtc
> *crtc,
> >  	struct drm_atomic_state *state;
> >  	int ret = 0;
> >
> > -	if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
> > -		return -EINVAL;
> > -
> >  	state = drm_atomic_state_alloc(plane->dev);
> >  	if (!state)
> >  		return -ENOMEM;
> > @@ -2865,9 +2864,6 @@ int drm_atomic_helper_page_flip_target(
> >  	struct drm_crtc_state *crtc_state;
> >  	int ret = 0;
> >
> > -	if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
> > -		return -EINVAL;
> > -
> >  	state = drm_atomic_state_alloc(plane->dev);
> >  	if (!state)
> >  		return -ENOMEM;
> > diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h index
> > db3bbde..86d8ffc 100644
> > --- a/include/drm/drm_plane.h
> > +++ b/include/drm/drm_plane.h
> > @@ -122,6 +122,14 @@ struct drm_plane_state {
> >  	 */
> >  	bool visible;
> >
> > +
> > +	/**
> > +	 * @pflip_flags:
> > +	 *
> > +	 * Flip related config options
> > +	 */
> > +	u32 pflip_flags;
> > +
> >  	struct drm_atomic_state *state;
> >  };
> >
> > --
> > 1.9.1
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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