linux-kernel - Re: [PATCH 1/3] drm: Add some new format DRM_FORMAT_NVXX

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Message-ID: <406cb41b-1840-df9d-a893-8ab9da8d6f4f@rock-chips.com>
Date:   Wed, 25 Sep 2019 19:01:41 +0800
From:   "sandy.huang" <hjc@...k-chips.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     heiko@...ech.de, Ayan.Halder@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] drm: Add some new format DRM_FORMAT_NVXX_10


在 2019/9/25 下午5:23, Maarten Lankhorst 写道:
> Op 25-09-2019 om 10:32 schreef sandy.huang:
>> 在 2019/9/25 下午4:17, Maarten Lankhorst 写道:
>>> Op 25-09-2019 om 10:06 schreef Sandy Huang:
>>>> 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@...k-chips.com>
>>>> ---
>>>>    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..f25fa81 100644
>>>> --- a/drivers/gpu/drm/drm_fourcc.c
>>>> +++ b/drivers/gpu/drm/drm_fourcc.c
>>>> @@ -274,6 +274,24 @@ const struct drm_format_info *__drm_format_info(u32 format)
>>>>            { .format = DRM_FORMAT_YUV420_10BIT,    .depth = 0,
>>>>              .num_planes = 1, .cpp = { 0, 0, 0 }, .hsub = 2, .vsub = 2,
>>>>              .is_yuv = true },
>>>> +        { .format = DRM_FORMAT_NV12_10,        .depth = 0,
>>>> +          .num_planes = 2, .cpp = { 0, 0, 0 }, .hsub = 2, .vsub = 2,
>>>> +          .is_yuv = true },
>>>> +        { .format = DRM_FORMAT_NV21_10,        .depth = 0,
>>>> +          .num_planes = 2, .cpp = { 0, 0, 0 }, .hsub = 2, .vsub = 2,
>>>> +          .is_yuv = true },
>>>> +        { .format = DRM_FORMAT_NV16_10,        .depth = 0,
>>>> +          .num_planes = 2, .cpp = { 0, 0, 0 }, .hsub = 2, .vsub = 1,
>>>> +          .is_yuv = true },
>>>> +        { .format = DRM_FORMAT_NV61_10,        .depth = 0,
>>>> +          .num_planes = 2, .cpp = { 0, 0, 0 }, .hsub = 2, .vsub = 1,
>>>> +          .is_yuv = true },
>>>> +        { .format = DRM_FORMAT_NV24_10,        .depth = 0,
>>>> +          .num_planes = 2, .cpp = { 0, 0, 0 }, .hsub = 1, .vsub = 1,
>>>> +          .is_yuv = true },
>>>> +        { .format = DRM_FORMAT_NV42_10,        .depth = 0,
>>>> +          .num_planes = 2, .cpp = { 0, 0, 0 }, .hsub = 1, .vsub = 1,
>>>> +          .is_yuv = true },
>>>>        };
>>>>          unsigned int i;
>>>> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
>>>> index 3feeaa3..0479f47 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 10bit
>>>> + * index 0 = Y plane, [9:0] Y
>>>> + * index 1 = Cr:Cb plane, [19:0]
>>>> + * or
>>>> + * index 1 = Cb:Cr plane, [19:0]
>>>> + */
>>>> +#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
>>> What are the other bits, they are not mentioned?
>> It's compact layout
>>
>> Yplane:
>>
>>      Y0[9:0]Y1[9:0]Y2[9:0]Y3[9:0]...
>>
>> UVplane:
>>
>>      U0[9:0]V0[9:0]U1[9:0]V1[9:0]...
> This should be put in the comment then, for clarity. :) Probably needs 4 pixels to describe how it fits in 5 (or 10 for cbcr) bytes.
>
> Cheers,
>
> Maarten
OK, I will add this describe at next version.
>
>
>