Subject: Re: [RFC, V2, 06/11] media: platform: Add Mediatek ISP P1 image & meta formats

From: Jungo Lin <[email-masked]>
Date: Wed, 15 May 2019 20:49:39 +0800

Hi, Hans:

Thanks for your comments.

On Mon, 2019-05-13 at 10:35 +0200, Hans Verkuil wrote:
> On 5/10/19 3:57 AM, Jungo Lin wrote:
> > Add packed/unpacked/full-g bayer format with 8/10/12/14 bit
> > for image output. Add Pass 1 (P1) specific meta formats for
> > parameter processing and 3A/other statistics.
> 
> These pixel formats will need to be documented in Documentation/media/uapi/v4l/pixfmt-<something>.rst.
> 

Ok, we will add these pixfmt-<something>.rst files in next patch to
explain these pixel formats.

> > 
> > Signed-off-by: Jungo Lin <[email-masked]>
> > ---
> >  include/uapi/linux/videodev2.h | 20 ++++++++++++++++++++
> >  1 file changed, 20 insertions(+)
> > 
> > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > index 1db220da3bcc..b79046d2d812 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -711,6 +711,20 @@ struct v4l2_pix_format {
> >  #define V4L2_PIX_FMT_IPU3_SGRBG10	v4l2_fourcc('i', 'p', '3', 'G') /* IPU3 packed 10-bit GRBG bayer */
> >  #define V4L2_PIX_FMT_IPU3_SRGGB10	v4l2_fourcc('i', 'p', '3', 'r') /* IPU3 packed 10-bit RGGB bayer */
> >  
> > +/* Vendor specific - Mediatek ISP compressed formats */
> > +#define V4L2_PIX_FMT_MTISP_U8	v4l2_fourcc('M', 'T', 'U', '8') /* Unpacked bayer format, 16-bit */
> > +#define V4L2_PIX_FMT_MTISP_U10  v4l2_fourcc('M', 'T', 'U', 'A') /* Unpacked bayer format, 16-bit */
> > +#define V4L2_PIX_FMT_MTISP_U12  v4l2_fourcc('M', 'T', 'U', 'C') /* Unpacked bayer format, 16-bit */
> > +#define V4L2_PIX_FMT_MTISP_U14  v4l2_fourcc('M', 'T', 'U', 'E') /* Unpacked bayer format, 16-bit */
> > +#define V4L2_PIX_FMT_MTISP_B8	v4l2_fourcc('M', 'T', 'B', '8') /* Packed   bayer format,  8-bit */
> > +#define V4L2_PIX_FMT_MTISP_B10  v4l2_fourcc('M', 'T', 'B', 'A') /* Packed   bayer format, 10-bit */
> > +#define V4L2_PIX_FMT_MTISP_B12  v4l2_fourcc('M', 'T', 'B', 'C') /* Packed   bayer format, 12-bit */
> > +#define V4L2_PIX_FMT_MTISP_B14  v4l2_fourcc('M', 'T', 'B', 'E') /* Packed   bayer format, 14-bit */
> > +#define V4L2_PIX_FMT_MTISP_F8	v4l2_fourcc('M', 'T', 'F', '8') /* Full-G   bayer format,  8-bit */
> > +#define V4L2_PIX_FMT_MTISP_F10  v4l2_fourcc('M', 'T', 'F', 'A') /* Full-G   bayer format, 10-bit */
> > +#define V4L2_PIX_FMT_MTISP_F12  v4l2_fourcc('M', 'T', 'F', 'C') /* Full-G   bayer format, 12-bit */
> > +#define V4L2_PIX_FMT_MTISP_F14  v4l2_fourcc('M', 'T', 'F', 'E') /* Full-G   bayer format, 14-bit */
> 
> Are these all compressed formats? What sort of compression is used? Can software unpack it,
> or this is meant to be fed to other mediatek hardware blocks?
> 

No, these are not compressed formats. These images could be unpacked by
software, not depended on Mediatek hardware blocks.

> > +
> >  /* SDR formats - used only for Software Defined Radio devices */
> >  #define V4L2_SDR_FMT_CU8          v4l2_fourcc('C', 'U', '0', '8') /* IQ u8 */
> >  #define V4L2_SDR_FMT_CU16LE       v4l2_fourcc('C', 'U', '1', '6') /* IQ u16le */
> > @@ -732,6 +746,12 @@ struct v4l2_pix_format {
> >  #define V4L2_META_FMT_VSP1_HGT    v4l2_fourcc('V', 'S', 'P', 'T') /* R-Car VSP1 2-D Histogram */
> >  #define V4L2_META_FMT_UVC         v4l2_fourcc('U', 'V', 'C', 'H') /* UVC Payload Header metadata */
> >  #define V4L2_META_FMT_D4XX        v4l2_fourcc('D', '4', 'X', 'X') /* D4XX Payload Header metadata */
> > +/* Vendor specific - Mediatek ISP parameters for firmware */
> > +#define V4L2_META_FMT_MTISP_PARAMS v4l2_fourcc('M', 'T', 'f', 'p') /* ISP tuning parameters */
> > +#define V4L2_META_FMT_MTISP_3A	   v4l2_fourcc('M', 'T', 'f', 'a') /* AE/AWB histogram */
> > +#define V4L2_META_FMT_MTISP_AF	   v4l2_fourcc('M', 'T', 'f', 'f') /* AF histogram */
> > +#define V4L2_META_FMT_MTISP_LCS	   v4l2_fourcc('M', 'T', 'f', 'c') /* Local contrast enhanced statistics */
> > +#define V4L2_META_FMT_MTISP_LMV	   v4l2_fourcc('M', 'T', 'f', 'm') /* Local motion vector histogram */
> 
> The documentation for these meta formats either needs to point to
> freely available mediatek documentation (i.e. no NDA needed), or it
> has to be documented in a header or in the pixelformat documentation.
> 

Ok, we are under internal discussion how to export these meta
information.

> Regards,
> 
> 	Hans
> 
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