Re: [v3 PATCH 1/3] drm/atomic: Save flip flags in drm_crtct_state

["Grodzovsky, Andrey" <Andrey.Grodzovsky-5C7GfCeVMHo@public.gmane.org>]

> -----Original Message-----
> From: Laurent Pinchart [mailto:laurent.pinchart@ideasonboard.com]
> Sent: Monday, January 30, 2017 6:05 AM
> To: Grodzovsky, Andrey
> Cc: dri-devel@lists.freedesktop.org; amd-gfx@lists.freedesktop.org;
> nouveau@lists.freedesktop.org; daniel.vetter@intel.com; dc_upstream
> Subject: Re: [v3 PATCH 1/3] drm/atomic: Save flip flags in drm_crtct_state
> 
> Hi Andrey,
> 
> Thank you for the patch.
> 
> On Saturday 28 Jan 2017 21:26:49 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_crtc_state to be used in the low level drivers.
> >
> > v2:
> > Resending the patch since the original was broken.
> >
> > v3:
> > Save flag in crtc_state instead of plane_state
> >
> > Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
> > ---
> >  drivers/gpu/drm/drm_atomic_helper.c | 19 +++++--------------
> >  include/drm/drm_crtc.h              |  8 +++++++-
> >  include/drm/drm_plane.h             |  1 +
> >  3 files changed, 13 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> > b/drivers/gpu/drm/drm_atomic_helper.c index a4e5477..28065ee 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; @@ -2749,12 +2750,12 @@
> static
> > int page_flip_common(
> >  		return PTR_ERR(crtc_state);
> >
> >  	crtc_state->event = event;
> > +	crtc_state->pflip_flags = flags;
> >
> >  	plane_state = drm_atomic_get_plane_state(state, plane);
> >  	if (IS_ERR(plane_state))
> >  		return PTR_ERR(plane_state);
> >
> > -
> >  	ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
> >  	if (ret != 0)
> >  		return ret;
> > @@ -2781,10 +2782,6 @@ static int page_flip_common(
> >   * Provides a default &drm_crtc_funcs.page_flip implementation
> >   * using the atomic driver interface.
> >   *
> > - * Note that for now so called async page flips (i.e. updates which
> > are not
> > - * synchronized to vblank) are not supported, since the atomic
> > interfaces have - * no provisions for this yet.
> > - *
> >   * Returns:
> >   * Returns 0 on success, negative errno numbers on failure.
> >   *
> > @@ -2800,9 +2797,6 @@ 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;
> > @@ -2810,7 +2804,7 @@ int drm_atomic_helper_page_flip(struct drm_crtc
> > *crtc,
> > state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
> >
> >  retry:
> > -	ret = page_flip_common(state, crtc, fb, event);
> > +	ret = page_flip_common(state, crtc, fb, event, flags);
> >  	if (ret != 0)
> >  		goto fail;
> >
> > @@ -2865,9 +2859,6 @@ 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;
> > @@ -2875,7 +2866,7 @@ int drm_atomic_helper_page_flip_target(
> >  	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
> >
> >  retry:
> > -	ret = page_flip_common(state, crtc, fb, event);
> > +	ret = page_flip_common(state, crtc, fb, event, flags);
> >  	if (ret != 0)
> >  		goto fail;
> >
> > diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index
> > 5c77c3f..76457a4 100644
> > --- a/include/drm/drm_crtc.h
> > +++ b/include/drm/drm_crtc.h
> > @@ -162,10 +162,16 @@ struct drm_crtc_state {
> >  	 * Target vertical blank period when a page flip
> >  	 * should take effect.
> >  	 */
> > -
> >  	u32 target_vblank;
> >
> >  	/**
> > +	 * @pflip_flags:
> > +	 *
> > +	 * Flip related config options
> 
> This isn't detailed enough. I propose something along the lines of
> 
> "DRM_MODE_PAGE_FLIP_* page flip flags, as passed to the page flip ioctl.
> Always zero for atomic commits that don't originate from a page flip ioctl."
> 
> You will then also need to reset the field to 0 at an appropriate point, as it's
> more an atomic commit transaction information than a state. Apart from that
> this patch looks good to me.
Thanks for your comments, i am not sure I understand why the reset is needed, 
for any future commit on same crtc the new state will have the field empty and 
if it's a flip IOCTL the field will be filled as needed in page_flip_common, otherwise it 
will stay empty. If the last commit on that crtc was a flip then why not keep this field 
with the bits that the user mode set ?
Thanks,
[Grodzovsky, Andrey] 
> 
> > +	 */
> > +	u32 pflip_flags;
> > +
> > +	/**
> >  	 * @event:
> >  	 *
> >  	 * Optional pointer to a DRM event to signal upon completion of the
> > diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h index
> > db3bbde..57414ae 100644
> > --- a/include/drm/drm_plane.h
> > +++ b/include/drm/drm_plane.h
> > @@ -122,6 +122,7 @@ struct drm_plane_state {
> >  	 */
> >  	bool visible;
> >
> >  	struct drm_atomic_state *state;
> >  };
> 
> --
> Regards,
> 
> Laurent Pinchart

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