[PATCH] drm/fourcc: Add formats for packed YUV 4:4:4 AVUY and XVUY permutations

[Daniel Vetter]

On Sat, Jun 25, 2022 at 12:37:23AM +0300, Laurent Pinchart wrote:
> Hi Daniel,
> 
> On Fri, Jun 24, 2022 at 11:16:46PM +0200, Daniel Vetter wrote:
> > On Thu, Jun 16, 2022 at 09:52:10PM +0300, Laurent Pinchart wrote:
> > > Add FourCCs for two missing permutations of the packed YUV 4:4:4 color
> > 
> > For a second I thought this 4:4:4 is the bit packing, but it's the 444
> > sampling rate thing.
> > 
> > Man formats are confusing.
> 
> :-)
> 
> > > components, namely AVUY and XVUY.
> > > 
> > > These formats are needed by the NXP i.MX8 ISI. While the ISI is
> > > supported by a V4L2 device (corresponding formats have been submitted to
> > > V4L2), it is handled in userspace by libcamera, which uses DRM FourCCs
> > > for pixel formats.
> > > 
> > > Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > > ---
> > >  include/uapi/drm/drm_fourcc.h | 2 ++
> > >  1 file changed, 2 insertions(+)
> > > 
> > > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> > > index f1972154a594..399d950c53e3 100644
> > > --- a/include/uapi/drm/drm_fourcc.h
> > > +++ b/include/uapi/drm/drm_fourcc.h
> > > @@ -205,7 +205,9 @@ extern "C" {
> > 
> > I build script to make sure we don't accidentally assign duplicated codes
> > would be nice, this is pain to check.
> 
> Do you mean something like
> 
> cat include/uapi/drm/drm_fourcc.h | \
> 	grep '#define DRM_FORMAT_.*fourcc_code' | \
> 	sed 's/.*fourcc_code(\([^)]*\)).*/\1/' | \
> 	sort | \
> 	uniq -c | \
> 	grep -qv '^ \+1 ' && echo "Duplicate 4CC !!"
> 
> ?
> 
> Where could this live ?

Can we stuff it into Kbuild as a check?
-Daniel

> 
> > Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> > 
> > >  #define DRM_FORMAT_VYUY		fourcc_code('V', 'Y', 'U', 'Y') /* [31:0] Y1:Cb0:Y0:Cr0 8:8:8:8 little endian */
> > >  
> > >  #define DRM_FORMAT_AYUV		fourcc_code('A', 'Y', 'U', 'V') /* [31:0] A:Y:Cb:Cr 8:8:8:8 little endian */
> > > +#define DRM_FORMAT_AVUY8888	fourcc_code('A', 'V', 'U', 'Y') /* [31:0] A:Cr:Cb:Y 8:8:8:8 little endian */
> > >  #define DRM_FORMAT_XYUV8888	fourcc_code('X', 'Y', 'U', 'V') /* [31:0] X:Y:Cb:Cr 8:8:8:8 little endian */
> > > +#define DRM_FORMAT_XVUY8888	fourcc_code('X', 'V', 'U', 'Y') /* [31:0] X:Cr:Cb:Y 8:8:8:8 little endian */
> > >  #define DRM_FORMAT_VUY888	fourcc_code('V', 'U', '2', '4') /* [23:0] Cr:Cb:Y 8:8:8 little endian */
> > >  #define DRM_FORMAT_VUY101010	fourcc_code('V', 'U', '3', '0') /* Y followed by U then V, 10:10:10. Non-linear modifier only */
> 
> -- 
> Regards,
> 
> Laurent Pinchart

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch