Re: [PATCH v2 1/3] drm: Add some new format DRM_FORMAT_NVXX_10

From: Ville Syrjälä
Date: Tue Oct 08 2019 - 07:33:45 EST

On Tue, Oct 08, 2019 at 10:40:20AM +0800, sandy.huang wrote:
> Hi ville syrjala,
>
> å 2019/9/30 äå6:48, Ville SyrjÃlà åé:
> > On Thu, Sep 26, 2019 at 04:24:47PM +0800, Sandy Huang wrote:
> >> These new format is supported by some rockchip socs:
> >>
> >> DRM_FORMAT_NV12_10/DRM_FORMAT_NV21_10
> >> DRM_FORMAT_NV16_10/DRM_FORMAT_NV61_10
> >> DRM_FORMAT_NV24_10/DRM_FORMAT_NV42_10
> >>
> >> Signed-off-by: Sandy Huang <hjc@xxxxxxxxxxxxxx>
> >> ---
> >> drivers/gpu/drm/drm_fourcc.c | 18 ++++++++++++++++++
> >> include/uapi/drm/drm_fourcc.h | 14 ++++++++++++++
> >> 2 files changed, 32 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> >> index c630064..ccd78a3 100644
> >> --- a/drivers/gpu/drm/drm_fourcc.c
> >> +++ b/drivers/gpu/drm/drm_fourcc.c
> >> @@ -261,6 +261,24 @@ const struct drm_format_info *__drm_format_info(u32 format)
> >> { .format = DRM_FORMAT_P016, .depth = 0, .num_planes = 2,
> >> .char_per_block = { 2, 4, 0 }, .block_w = { 1, 0, 0 }, .block_h = { 1, 0, 0 },
> >> .hsub = 2, .vsub = 2, .is_yuv = true},
> >> + { .format = DRM_FORMAT_NV12_10, .depth = 0, .num_planes = 2,
> >> + .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> >> + .hsub = 2, .vsub = 2, .is_yuv = true},
> >> + { .format = DRM_FORMAT_NV21_10, .depth = 0, .num_planes = 2,
> >> + .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> >> + .hsub = 2, .vsub = 2, .is_yuv = true},
> >> + { .format = DRM_FORMAT_NV16_10, .depth = 0, .num_planes = 2,
> >> + .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> >> + .hsub = 2, .vsub = 1, .is_yuv = true},
> >> + { .format = DRM_FORMAT_NV61_10, .depth = 0, .num_planes = 2,
> >> + .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> >> + .hsub = 2, .vsub = 1, .is_yuv = true},
> >> + { .format = DRM_FORMAT_NV24_10, .depth = 0, .num_planes = 2,
> >> + .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> >> + .hsub = 1, .vsub = 1, .is_yuv = true},
> >> + { .format = DRM_FORMAT_NV42_10, .depth = 0, .num_planes = 2,
> >> + .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> >> + .hsub = 1, .vsub = 1, .is_yuv = true},
> >> { .format = DRM_FORMAT_P210, .depth = 0,
> >> .num_planes = 2, .char_per_block = { 2, 4, 0 },
> >> .block_w = { 1, 0, 0 }, .block_h = { 1, 0, 0 }, .hsub = 2,
> >> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> >> index 3feeaa3..08e2221 100644
> >> --- a/include/uapi/drm/drm_fourcc.h
> >> +++ b/include/uapi/drm/drm_fourcc.h
> >> @@ -238,6 +238,20 @@ extern "C" {
> >> #define DRM_FORMAT_NV42 fourcc_code('N', 'V', '4', '2') /* non-subsampled Cb:Cr plane */
> >>
> >> /*
> >> + * 2 plane YCbCr
> >> + * index 0 = Y plane, Y3:Y2:Y1:Y0 10:10:10:10
> >> + * index 1 = Cb:Cr plane, Cb3:Cr3:Cb2:Cr2:Cb1:Cr1:Cb0:Cr0 10:10:10:10:10:10:10:10
> >> + * or
> >> + * index 1 = Cr:Cb plane, Cr3:Cb3:Cr2:Cb2:Cr1:Cb1:Cr0:Cb0 10:10:10:10:10:10:10:10
> > So now you're defining it as some kind of byte aligned block.
> > With that specifying endianness would now make sense since
> > otherwise this tells us absolutely nothing about the memory
> > layout.
> >
> > So I'd either do that, or go back to not specifying anything and
> > use some weasel words like "mamory layout is implementation defined"
> > which of course means no one can use it for anything that involves
> > any kind of cross vendor stuff.
> /*
> Â* 2 plane YCbCr
> Â* index 0 = Y plane, [39: 0] Y3:Y2:Y1:Y0 10:10:10:10Â little endian
> Â* index 1 = Cb:Cr plane, [79: 0] Cb3:Cr3:Cb2:Cr2:Cb1:Cr1:Cb0:Cr0
> 10:10:10:10:10:10:10:10Â little endian
> Â* or
> Â* index 1 = Cr:Cb plane, [79: 0] Cr3:Cb3:Cr2:Cb2:Cr1:Cb1:Cr0:Cb0
> 10:10:10:10:10:10:10:10Â little endian
> Â*/
>
> Is this description ok?

Seems OK to me, if it actually describes the format correctly.

Though I'm not sure why the CbCr is defines as an 80bit block
and Y has a 40bit block. 40bits should be enough for CbCr as well.

>
> >> + */
> >> +#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 */
> >> +
> >> +/*
> >> * 2 plane YCbCr MSB aligned
> >> * index 0 = Y plane, [15:0] Y:x [10:6] little endian
> >> * index 1 = Cr:Cb plane, [31:0] Cr:x:Cb:x [10:6:10:6] little endian
> >> --
> >> 2.7.4
> >>
> >>
> >>
> >> _______________________________________________
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> >> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> >> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>

--
Ville SyrjÃlÃ
Intel