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Date: Thu, 23 May 2024 12:14:42 +0200
From: Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To: Yunfei Dong <yunfei.dong@...iatek.com>,
Jeffrey Kardatzke <jkardatzke@...gle.com>,
Nícolas F . R . A . Prado <nfraprado@...labora.com>,
Nathan Hebert <nhebert@...omium.org>,
Nicolas Dufresne <nicolas.dufresne@...labora.com>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
Benjamin Gaignard <benjamin.gaignard@...labora.com>,
Sebastian Fricke <sebastian.fricke@...labora.com>,
Tomasz Figa <tfiga@...omium.org>, Mauro Carvalho Chehab
<mchehab@...nel.org>, Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>, Yong Wu <yong.wu@...iatek.com>,
Hsin-Yi Wang <hsinyi@...omium.org>, Fritz Koenig <frkoenig@...omium.org>,
Daniel Vetter <daniel@...ll.ch>, Steve Cho <stevecho@...omium.org>,
Sumit Semwal <sumit.semwal@...aro.org>, Brian Starkey
<Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>,
"T . J . Mercier" <tjmercier@...gle.com>,
Christian König <christian.koenig@....com>,
Matthias Brugger <matthias.bgg@...il.com>, linux-media@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v6,14/24] media: mediatek: vcodec: Add capture format to
support one plane memory
Hi,
I'm having second thoughts, please see inline,
W dniu 22.05.2024 o 14:26, Andrzej Pietrasiewicz pisze:
> Hi Yunfei,
>
> W dniu 16.05.2024 o 14:20, Yunfei Dong pisze:
>> Define one uncompressed capture format V4L2_PIX_FMT_MS21 in order to
>> support one plane memory. The buffer size is luma + chroma, luma is
>> stored at the start and chrome is stored at the end.
>>
>> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
>> ---
>> Documentation/userspace-api/media/v4l/pixfmt-reserved.rst | 8 ++++++++
>> drivers/media/v4l2-core/v4l2-common.c | 2 ++
>> drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
>> include/uapi/linux/videodev2.h | 1 +
>> 4 files changed, 12 insertions(+)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
>> index 886ba7b08d6b..6ec899649d50 100644
>> --- a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
>> +++ b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
>> @@ -295,6 +295,14 @@ please make a proposal on the linux-media mailing list.
>> - Compressed format used by Nuvoton NPCM video driver. This format is
>> defined in Remote Framebuffer Protocol (RFC 6143, chapter 7.7.4 Hextile
>> Encoding).
>> + * .. _V4L2-PIX-FMT-MS21:
>> +
>> + - ``V4L2_PIX_FMT_MS21``
>> + - 'MS21'
>> + - This format has one plane, luma and chroma are stored in a contiguous
>
> Maybe s/one/single ?
>
>> + memory. Luma pixel in 16x32 tiles at the start, chroma pixel in 16x16
>
> maybe the word "pixel" is reduntant here? What else than pixels could tile sizes mean?
> Any padding between luma and chroma?
>
>> + tiles at the end. The image height must be aligned with 32 and the image
>> + width must be aligned with 16.
>
> Maybe aligned to?
>
>> .. raw:: latex
>> \normalsize
>> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
>> index 4165c815faef..5ae54cf48dc7 100644
>> --- a/drivers/media/v4l2-core/v4l2-common.c
>> +++ b/drivers/media/v4l2-core/v4l2-common.c
>> @@ -271,6 +271,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
>> .block_w = { 16, 8, 0, 0 }, .block_h = { 32, 16, 0, 0 }},
>> { .format = V4L2_PIX_FMT_MT2110R, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 5, 10, 0, 0 }, .bpp_div = { 4, 4, 1, 1 }, .hdiv = 2, .vdiv = 2,
>> .block_w = { 16, 8, 0, 0 }, .block_h = { 32, 16, 0, 0 }},
>> + { .format = V4L2_PIX_FMT_MS21, pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2,
>> + .block_w = { 16, 8, 0, 0 }, .block_h = { 32, 16, 0, 0 }},
>> /* YUV planar formats */
>> { .format = V4L2_PIX_FMT_NV12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 },
>> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
>> index 4c76d17b4629..3a68f2b9e7a4 100644
>> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
>> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
>> @@ -1529,6 +1529,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>> case V4L2_PIX_FMT_MT2110T: descr = "Mediatek 10bit Tile Mode"; break;
>> case V4L2_PIX_FMT_MT2110R: descr = "Mediatek 10bit Raster Mode"; break;
>> case V4L2_PIX_FMT_HEXTILE: descr = "Hextile Compressed Format"; break;
>> + case V4L2_PIX_FMT_MS21: descr = "MediaTek One Plane Format"; break;
>
> s/One/Single ?
>
On the other hand "single" would be [in this case incorrectly] associated with
single-planar API, which would be totally confusing.
Still, the reality you are trying to model is complex: you use
MPLANE, yet there's a single plane in case of secure playback.
Regards,
Andrzej
> Regards,
>
> Andrzej
>
>> default:
>> if (fmt->description[0])
>> return;
>> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>> index 89eb1a3c6555..7aff2f2c8f9c 100644
>> --- a/include/uapi/linux/videodev2.h
>> +++ b/include/uapi/linux/videodev2.h
>> @@ -800,6 +800,7 @@ struct v4l2_pix_format {
>> #define V4L2_PIX_FMT_MM21 v4l2_fourcc('M', 'M', '2', '1') /* Mediatek 8-bit block mode, two non-contiguous planes */
>> #define V4L2_PIX_FMT_MT2110T v4l2_fourcc('M', 'T', '2', 'T') /* Mediatek 10-bit block tile mode */
>> #define V4L2_PIX_FMT_MT2110R v4l2_fourcc('M', 'T', '2', 'R') /* Mediatek 10-bit block raster mode */
>> +#define V4L2_PIX_FMT_MS21 v4l2_fourcc('M', 'S', '2', '1') /* MediaTek 8-bit block mode with one plane */
>> #define V4L2_PIX_FMT_INZI v4l2_fourcc('I', 'N', 'Z', 'I') /* Intel Planar Greyscale 10-bit and Depth 16-bit */
>> #define V4L2_PIX_FMT_CNF4 v4l2_fourcc('C', 'N', 'F', '4') /* Intel 4-bit packed depth confidence information */
>> #define V4L2_PIX_FMT_HI240 v4l2_fourcc('H', 'I', '2', '4') /* BTTV 8-bit dithered RGB */
>
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