[PATCH v1 2/3] ipa: rpi: Add cam_helper for imx415

[Dave Stevenson]

Hi David

On Wed, 8 Jan 2025 at 09:53, David Plowman
<david.plowman at raspberrypi.com> wrote:
>
> Hi everyone
>
> On Wed, 8 Jan 2025 at 09:03, Naushir Patuck <naush at raspberrypi.com> wrote:
> >
> > From: Dave Stevenson <dave.stevenson at raspberrypi.com>
> >
> > As another Starvis sensor, it is near identical to imx290/327.
> >
> > Signed-off-by: Dave Stevenson <dave.stevenson at raspberrypi.com>
> > Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
>
> Reviewed-by: David Plowman <david.plowman at raspberrypi.com>
>
> If it's truly identical I suppose we could have re-registered the
> imx290 helper under "imx415". But maybe we don't like that and this is
> probably better!

IMX290/327 are 1080p sensors, whilst IMX415 is 4k.
I'd written the coment before the delays moved out to
camera_sensor_properties. With that removed it's more that all the
Starvis sensors are using the same "steps of 0.3dB" for gain.
frameIntegrationDiff does differ as 2 on 290/327 vs 8 here.

IMHO It probably makes more sense to keep it separate.

  Dave

> Thanks
> David
>
> > ---
> >  src/ipa/rpi/cam_helper/cam_helper_imx415.cpp | 64 ++++++++++++++++++++
> >  src/ipa/rpi/cam_helper/meson.build           |  1 +
> >  2 files changed, 65 insertions(+)
> >  create mode 100644 src/ipa/rpi/cam_helper/cam_helper_imx415.cpp
> >
> > diff --git a/src/ipa/rpi/cam_helper/cam_helper_imx415.cpp b/src/ipa/rpi/cam_helper/cam_helper_imx415.cpp
> > new file mode 100644
> > index 000000000000..c0a09eee3dee
> > --- /dev/null
> > +++ b/src/ipa/rpi/cam_helper/cam_helper_imx415.cpp
> > @@ -0,0 +1,64 @@
> > +/* SPDX-License-Identifier: BSD-2-Clause */
> > +/*
> > + * Copyright (C) 2025, Raspberry Pi Ltd
> > + *
> > + * camera helper for imx415 sensor
> > + */
> > +
> > +#include <cmath>
> > +
> > +#include "cam_helper.h"
> > +
> > +using namespace RPiController;
> > +
> > +class CamHelperImx415 : public CamHelper
> > +{
> > +public:
> > +       CamHelperImx415();
> > +       uint32_t gainCode(double gain) const override;
> > +       double gain(uint32_t gainCode) const override;
> > +       unsigned int hideFramesStartup() const override;
> > +       unsigned int hideFramesModeSwitch() const override;
> > +
> > +private:
> > +       /*
> > +        * Smallest difference between the frame length and integration time,
> > +        * in units of lines.
> > +        */
> > +       static constexpr int frameIntegrationDiff = 8;
> > +};
> > +
> > +CamHelperImx415::CamHelperImx415()
> > +       : CamHelper({}, frameIntegrationDiff)
> > +{
> > +}
> > +
> > +uint32_t CamHelperImx415::gainCode(double gain) const
> > +{
> > +       int code = 66.6667 * std::log10(gain);
> > +       return std::max(0, std::min(code, 0xf0));
> > +}
> > +
> > +double CamHelperImx415::gain(uint32_t gainCode) const
> > +{
> > +       return std::pow(10, 0.015 * gainCode);
> > +}
> > +
> > +unsigned int CamHelperImx415::hideFramesStartup() const
> > +{
> > +       /* On startup, we seem to get 1 bad frame. */
> > +       return 1;
> > +}
> > +
> > +unsigned int CamHelperImx415::hideFramesModeSwitch() const
> > +{
> > +       /* After a mode switch, we seem to get 1 bad frame. */
> > +       return 1;
> > +}
> > +
> > +static CamHelper *create()
> > +{
> > +       return new CamHelperImx415();
> > +}
> > +
> > +static RegisterCamHelper reg("imx415", &create);
> > diff --git a/src/ipa/rpi/cam_helper/meson.build b/src/ipa/rpi/cam_helper/meson.build
> > index 03e88fe082e2..abf021474b5c 100644
> > --- a/src/ipa/rpi/cam_helper/meson.build
> > +++ b/src/ipa/rpi/cam_helper/meson.build
> > @@ -7,6 +7,7 @@ rpi_ipa_cam_helper_sources = files([
> >      'cam_helper_imx283.cpp',
> >      'cam_helper_imx290.cpp',
> >      'cam_helper_imx296.cpp',
> > +    'cam_helper_imx415.cpp',
> >      'cam_helper_imx477.cpp',
> >      'cam_helper_imx519.cpp',
> >      'cam_helper_imx708.cpp',
> > --
> > 2.43.0
> >