linux-kernel - Re: [PATCH v3 06/11] drm/fourcc: Add DRM_FORMAT

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Message-ID: <20250219150840.GA31825@pendragon.ideasonboard.com>
Date: Wed, 19 Feb 2025 17:08:40 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Vishal Sagar <vishal.sagar@....com>,
	Anatoliy Klymenko <anatoliy.klymenko@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Michal Simek <michal.simek@....com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v3 06/11] drm/fourcc: Add DRM_FORMAT_XVUY2101010

On Wed, Feb 19, 2025 at 04:47:26PM +0200, Tomi Valkeinen wrote:
> Hi,
> 
> On 18/02/2025 05:26, Dmitry Baryshkov wrote:
> > On Mon, Feb 17, 2025 at 10:27:56PM +0200, Tomi Valkeinen wrote:
> >> Hi,
> >>
> >> On 17/02/2025 22:15, Dmitry Baryshkov wrote:
> >>> On Wed, Feb 12, 2025 at 04:56:10PM +0200, Tomi Valkeinen wrote:
> >>>> Add XVUY2101010, a 10 bits per component YCbCr format in a 32 bit
> >>>> container.
> >>>
> >>> Is there a more common name for this format? Otherwise googling for it
> >>> reveals only your series.
> >>
> >> In the cover letter I mention the gstreamer names where available (this
> >> particular format is not in gstreamer). AMD has these in their zynqmp
> >> documentation (https://docs.amd.com/r/en-US/ug1085-zynq-ultrascale-trm/Video-Packer-Format).
> >>
> >> XVUY2101010 is YUV444_10BPC in AMD docs.
> >>
> >> X403 is Y444_10LE32 in gstreamer, and YV24_10BPC in AMD docs.
> >>
> >> I'm not sure you'll have much more luck googling with those names, though
> >> =).
> > 
> > I'm asking, because include/uapi/drm/drm_fourcc.h has a pretty explicit
> > waiver: GL, Vulkan or other open standards. Otherwise normal
> > requirements apply and it's required to have an open-source usespace
> > implementation, etc.
> 
> I can drop DRM_FORMAT_XVUY2101010 until we get it to gstreamer. I just 
> had it ready, so I thought it's better to include it than leave out.
> 
> Is the current gstreamer support enough for the other formats to fulfill 
> the userspace requirement?

We've received a green light in the past to add formats to drm_fourcc.h
that would be used by cameras only. There's no open formal standard there, but
we have libcamera as a de-facto standard. I would assume GStreamer to be
enough for a scanout format.

-- 
Regards,

Laurent Pinchart