linux-kernel - Re: [PATCH v2] media: v4l: Add new 10-bit packed grayscale format

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Message-ID: <3b9e09b1-462f-509e-e2e3-06ede47331a1@linaro.org>
Date:   Fri, 8 Jun 2018 11:19:20 +0300
From:   Todor Tomov <todor.tomov@...aro.org>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     sakari.ailus@....fi, mchehab@...nel.org,
        laurent.pinchart@...asonboard.com, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: v4l: Add new 10-bit packed grayscale format

Hi Hans,

On  8.06.2018 11:13, Hans Verkuil wrote:
> On 05/08/2018 10:46 AM, Todor Tomov wrote:
>> The new format will be called V4L2_PIX_FMT_Y10P.
>> It is similar to the V4L2_PIX_FMT_SBGGR10P family formats
>> but V4L2_PIX_FMT_Y10P is a grayscale format.
>>
>> Signed-off-by: Todor Tomov <todor.tomov@...aro.org>
> 
> I see no patch adding support for this to a driver. We don't like adding new
> defines without a driver that needs it.
> 
> Is it possible to add support for this to a mainlined driver? Or is it going to
> be used by a new driver?

This will be used by a new version of the QComm CAMSS driver. I wanted to get it
reviewed first.
If it is ok, you could take it when the new QComm CAMSS is posted and accepted.

Best regards,
Todor

> 
> Regards,
> 
> 	Hans
> 
>> ---
>>
>> v2:
>> - doc: improved bit-packed representation: added bit positions for LSB bits;
>> - doc: improved bit-packed representation: added table column widths.
>>
>>  Documentation/media/uapi/v4l/pixfmt-y10p.rst | 33 ++++++++++++++++++++++++++++
>>  Documentation/media/uapi/v4l/yuv-formats.rst |  1 +
>>  drivers/media/v4l2-core/v4l2-ioctl.c         |  1 +
>>  include/uapi/linux/videodev2.h               |  1 +
>>  4 files changed, 36 insertions(+)
>>  create mode 100644 Documentation/media/uapi/v4l/pixfmt-y10p.rst
>>
>> diff --git a/Documentation/media/uapi/v4l/pixfmt-y10p.rst b/Documentation/media/uapi/v4l/pixfmt-y10p.rst
>> new file mode 100644
>> index 0000000..13b5713
>> --- /dev/null
>> +++ b/Documentation/media/uapi/v4l/pixfmt-y10p.rst
>> @@ -0,0 +1,33 @@
>> +.. -*- coding: utf-8; mode: rst -*-
>> +
>> +.. _V4L2-PIX-FMT-Y10P:
>> +
>> +******************************
>> +V4L2_PIX_FMT_Y10P ('Y10P')
>> +******************************
>> +
>> +Grey-scale image as a MIPI RAW10 packed array
>> +
>> +
>> +Description
>> +===========
>> +
>> +This is a packed grey-scale image format with a depth of 10 bits per
>> +pixel. Every four consecutive pixels are packed into 5 bytes. Each of
>> +the first 4 bytes contain the 8 high order bits of the pixels, and
>> +the 5th byte contains the 2 least significants bits of each pixel,
>> +in the same order.
>> +
>> +**Bit-packed representation.**
>> +
>> +.. flat-table::
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths: 8 8 8 8 64
>> +
>> +    * - Y'\ :sub:`00[9:2]`
>> +      - Y'\ :sub:`01[9:2]`
>> +      - Y'\ :sub:`02[9:2]`
>> +      - Y'\ :sub:`03[9:2]`
>> +      - Y'\ :sub:`03[1:0]`\ (bits 7--6) Y'\ :sub:`02[1:0]`\ (bits 5--4)
>> +	Y'\ :sub:`01[1:0]`\ (bits 3--2) Y'\ :sub:`00[1:0]`\ (bits 1--0)
>> diff --git a/Documentation/media/uapi/v4l/yuv-formats.rst b/Documentation/media/uapi/v4l/yuv-formats.rst
>> index 3334ea4..9ab0592 100644
>> --- a/Documentation/media/uapi/v4l/yuv-formats.rst
>> +++ b/Documentation/media/uapi/v4l/yuv-formats.rst
>> @@ -29,6 +29,7 @@ to brightness information.
>>      pixfmt-y10
>>      pixfmt-y12
>>      pixfmt-y10b
>> +    pixfmt-y10p
>>      pixfmt-y16
>>      pixfmt-y16-be
>>      pixfmt-y8i
>> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
>> index de5d96d..dececea 100644
>> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
>> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
>> @@ -1147,6 +1147,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>>  	case V4L2_PIX_FMT_Y16:		descr = "16-bit Greyscale"; break;
>>  	case V4L2_PIX_FMT_Y16_BE:	descr = "16-bit Greyscale BE"; break;
>>  	case V4L2_PIX_FMT_Y10BPACK:	descr = "10-bit Greyscale (Packed)"; break;
>> +	case V4L2_PIX_FMT_Y10P:		descr = "10-bit Greyscale (MIPI Packed)"; break;
>>  	case V4L2_PIX_FMT_Y8I:		descr = "Interleaved 8-bit Greyscale"; break;
>>  	case V4L2_PIX_FMT_Y12I:		descr = "Interleaved 12-bit Greyscale"; break;
>>  	case V4L2_PIX_FMT_Z16:		descr = "16-bit Depth"; break;
>> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>> index 600877b..b24ab720 100644
>> --- a/include/uapi/linux/videodev2.h
>> +++ b/include/uapi/linux/videodev2.h
>> @@ -522,6 +522,7 @@ struct v4l2_pix_format {
>>  
>>  /* Grey bit-packed formats */
>>  #define V4L2_PIX_FMT_Y10BPACK    v4l2_fourcc('Y', '1', '0', 'B') /* 10  Greyscale bit-packed */
>> +#define V4L2_PIX_FMT_Y10P    v4l2_fourcc('Y', '1', '0', 'P') /* 10  Greyscale, MIPI RAW10 packed */
>>  
>>  /* Palette formats */
>>  #define V4L2_PIX_FMT_PAL8    v4l2_fourcc('P', 'A', 'L', '8') /*  8  8-bit palette */
>>
>