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

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Date:   Mon, 23 Sep 2019 15:53:15 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Sandy Huang <hjc@...k-chips.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/36] drm/fourcc: Add 2 plane YCbCr 10bit format support

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?

> + */
> +
> +#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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-- 
Ville Syrjälä
Intel

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