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

[Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>]

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.

> +	 */
> +	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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