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

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Message-ID: <gkqq3c6pew5etfmjqqzgxtddlu7h3tbscrijkbymls524vfrrz@uy7qysfecrjk>
Date: Wed, 19 Feb 2025 19:28:44 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
	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 05:08:40PM +0200, Laurent Pinchart wrote:
> 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.

Thanks for the clarification!

-- 
With best wishes
Dmitry