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

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Message-ID: <82664d48-36de-15fd-3b30-a12907e5bfcd@rock-chips.com>
Date:   Mon, 23 Sep 2019 06:05:22 -0700
From:   "sandy.huang" <hjc@...k-chips.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.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

在 2019/9/23 上午5:53, Ville Syrjälä 写道:
> 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.

/*
  * 2 plane YCbCr
  * index 0 = Y plane, [7:0] Y
  * index 1 = Cr:Cb plane, [15:0] Cr:Cb little endian
  * or
  * index 1 = Cb:Cr plane, [15:0] Cb:Cr little endian
  */
#define DRM_FORMAT_NV12        fourcc_code('N', 'V', '1', '2') /* 2x2 
subsampled Cr:Cb plane */
#define DRM_FORMAT_NV21        fourcc_code('N', 'V', '2', '1') /* 2x2 
subsampled Cb:Cr plane */
#define DRM_FORMAT_NV16        fourcc_code('N', 'V', '1', '6') /* 2x1 
subsampled Cr:Cb plane */
#define DRM_FORMAT_NV61        fourcc_code('N', 'V', '6', '1') /* 2x1 
subsampled Cb:Cr plane */
#define DRM_FORMAT_NV24        fourcc_code('N', 'V', '2', '4') /* 
non-subsampled Cr:Cb plane */
#define DRM_FORMAT_NV42        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
>>
>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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