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Date:   Mon, 23 Sep 2019 15:53:15 +0300
From:   Ville =?iso-8859-1?Q?Syrj=E4l=E4?= <ville.syrjala@linux.intel.com>
To:     Sandy Huang <hjc@rock-chips.com>
Cc:     dri-devel@lists.freedesktop.org,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/36] drm/fourcc: Add 2 plane YCbCr 10bit format support
Message-ID: <20190923125314.GJ1208@intel.com>
References: <1569242365-182133-1-git-send-email-hjc@rock-chips.com>
 <1569242365-182133-2-git-send-email-hjc@rock-chips.com>
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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 Syrj?l?
Intel