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SubjectRe: [PATCH v1 1/9] media: v4l2-ctrls: Add user controls for StarFive JH7110 ISP
Hi Changhuang,

On Fri, Dec 15, 2023 at 01:55:09PM +0800, Changhuang Liang wrote:
> On 2023/12/14 19:39, Laurent Pinchart wrote:
> > On Wed, Dec 13, 2023 at 10:50:19PM -0800, Changhuang Liang wrote:
> >> Add a control base for StarFive JH7110 ISP driver controls, and reserve
> >> 32 controls,also add some controls for StarFive JH7110 ISP.
> >
> > ISP parameters should be passed through parameters buffers, not V4L2
> > control. See for instance the V4L2_META_FMT_RK_ISP1_PARAMS format in the
> > mainline kernel, it describes how to store ISP parameters in a buffer.
> > The rkisp1 driver is an example of how this can be implemented.
>
> That means I need to add a video output device before ISP subdev? And
> use queue/dequeue buffer to get the ISP paremeters?

Yes, that is correct.

> > Please note that the ISP parameters need to be documented precisely,
> > regardless of how they're passed by userspace to the kernel. Even with
> > V4L2 controls, documentation would be needed. Please see below for
> > additional comments.
>
> I will add annotations for this file next version.
>
> >> Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
> >> ---
> >> MAINTAINERS | 1 +
> >> include/uapi/linux/jh7110-isp.h | 342 +++++++++++++++++++++++++++++
> >> include/uapi/linux/v4l2-controls.h | 6 +
> [...]

--
Regards,

Laurent Pinchart

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