linux-kernel - Re: [PATCH RFC v6 01/10] drm: Introduce pixel

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Message-ID: <20230829104816.19122c6d@eldfell>
Date:   Tue, 29 Aug 2023 10:48:16 +0300
From:   Pekka Paalanen <ppaalanen@...il.com>
To:     Jessica Zhang <quic_jesszhan@...cinc.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Sean Paul" <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        <quic_abhinavk@...cinc.com>, <contact@...rsion.fr>,
        <laurent.pinchart@...asonboard.com>, <sebastian.wick@...hat.com>,
        <ville.syrjala@...ux.intel.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <freedreno@...ts.freedesktop.org>,
        <wayland-devel@...ts.freedesktop.org>
Subject: Re: [PATCH RFC v6 01/10] drm: Introduce pixel_source DRM plane
 property

On Mon, 28 Aug 2023 17:05:07 -0700
Jessica Zhang <quic_jesszhan@...cinc.com> wrote:

> Add support for pixel_source property to drm_plane and related
> documentation. In addition, force pixel_source to
> DRM_PLANE_PIXEL_SOURCE_FB in DRM_IOCTL_MODE_SETPLANE as to not break
> legacy userspace.
> 
> This enum property will allow user to specify a pixel source for the
> plane. Possible pixel sources will be defined in the
> drm_plane_pixel_source enum.
> 
> Currently, the only pixel sources are DRM_PLANE_PIXEL_SOURCE_FB (the
> default value) and DRM_PLANE_PIXEL_SOURCE_NONE.
> 
> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> ---
>  drivers/gpu/drm/drm_atomic_state_helper.c |  1 +
>  drivers/gpu/drm/drm_atomic_uapi.c         |  4 ++
>  drivers/gpu/drm/drm_blend.c               | 90 +++++++++++++++++++++++++++++++
>  drivers/gpu/drm/drm_plane.c               | 19 +++++--
>  include/drm/drm_blend.h                   |  2 +
>  include/drm/drm_plane.h                   | 21 ++++++++
>  6 files changed, 133 insertions(+), 4 deletions(-)

...

> diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
> index 6e74de833466..c3c57bae06b7 100644
> --- a/drivers/gpu/drm/drm_blend.c
> +++ b/drivers/gpu/drm/drm_blend.c
> @@ -185,6 +185,21 @@
>   *		 plane does not expose the "alpha" property, then this is
>   *		 assumed to be 1.0
>   *
> + * pixel_source:
> + *	pixel_source is set up with drm_plane_create_pixel_source_property().
> + *	It is used to toggle the active source of pixel data for the plane.
> + *	The plane will only display data from the set pixel_source -- any
> + *	data from other sources will be ignored.
> + *
> + *	Possible values:
> + *
> + *	"NONE":
> + *		No active pixel source.
> + *		Committing with a NONE pixel source will disable the plane.
> + *
> + *	"FB":
> + *		Framebuffer source set by the "FB_ID" property.
> + *
>   * Note that all the property extensions described here apply either to the
>   * plane or the CRTC (e.g. for the background color, which currently is not
>   * exposed and assumed to be black).

This UAPI:
Acked-by: Pekka Paalanen <pekka.paalanen@...labora.com>


Thanks,
pq

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