Re: [PATCH 01/36] drm/fourcc: Add 2 plane YCbCr 10bit format support

[sandy.huang]

å 2019/9/23 äå5:53, Ville SyrjÃlà åé:
> On Mon, Sep 23, 2019 at 08:38:50PM +0800, Sandy Huang wrote:
> > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> > index 3feeaa3..5fe89e9 100644
> > --- a/include/uapi/drm/drm_fourcc.h
> > +++ b/include/uapi/drm/drm_fourcc.h
> > @@ -266,6 +266,21 @@ extern "C" {
> >   #define DRM_FORMAT_P016		fourcc_code('P', '0', '1', '6') /* 2x2 subsampled Cr:Cb plane 16 bits per channel */
> >   
> >   /*
> > + * 2 plane YCbCr 10bit
> > + * index 0 = Y plane, [9:0] Y
> > + * index 1 = Cr:Cb plane, [19:0] Cr:Cb little endian
> > + * or
> > + * index 1 = Cb:Cr plane, [19:0] Cb:Cr little endian
> What does "little endian" even mean for these?

It's Inherited from the following define, the difference is 8bit and 10bit.

/*
Â* 2 plane YCbCr
Â* index 0 = Y plane, [7:0] Y
Â* index 1 = Cr:Cb plane, [15:0] Cr:Cb little endian
Â* or
Â* index 1 = Cb:Cr plane, [15:0] Cb:Cr little endian
Â*/
#define DRM_FORMAT_NV12ÂÂÂ ÂÂÂ fourcc_code('N', 'V', '1', '2') /* 2x2 
subsampled Cr:Cb plane */
#define DRM_FORMAT_NV21ÂÂÂ ÂÂÂ fourcc_code('N', 'V', '2', '1') /* 2x2 
subsampled Cb:Cr plane */
#define DRM_FORMAT_NV16ÂÂÂ ÂÂÂ fourcc_code('N', 'V', '1', '6') /* 2x1 
subsampled Cr:Cb plane */
#define DRM_FORMAT_NV61ÂÂÂ ÂÂÂ fourcc_code('N', 'V', '6', '1') /* 2x1 
subsampled Cb:Cr plane */
#define DRM_FORMAT_NV24ÂÂÂ ÂÂÂ fourcc_code('N', 'V', '2', '4') /* 
non-subsampled Cr:Cb plane */
#define DRM_FORMAT_NV42ÂÂÂ ÂÂÂ fourcc_code('N', 'V', '4',


> > + */
> > +
> > +#define DRM_FORMAT_NV12_10	fourcc_code('N', 'A', '1', '2') /* 2x2 subsampled Cr:Cb plane */
> > +#define DRM_FORMAT_NV21_10	fourcc_code('N', 'A', '2', '1') /* 2x2 subsampled Cb:Cr plane */
> > +#define DRM_FORMAT_NV16_10	fourcc_code('N', 'A', '1', '6') /* 2x1 subsampled Cr:Cb plane */
> > +#define DRM_FORMAT_NV61_10	fourcc_code('N', 'A', '6', '1') /* 2x1 subsampled Cb:Cr plane */
> > +#define DRM_FORMAT_NV24_10	fourcc_code('N', 'A', '2', '4') /* non-subsampled Cr:Cb plane */
> > +#define DRM_FORMAT_NV42_10	fourcc_code('N', 'A', '4', '2') /* non-subsampled Cb:Cr plane */
> > +
> > +/*
> >    * 3 plane YCbCr
> >    * index 0: Y plane, [7:0] Y
> >    * index 1: Cb plane, [7:0] Cb
> > --
> > 2.7.4
> >
> >
> >
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