[libcamera-devel] [PATCH v2] libcamera: Add support for OmniVision OV8858

[Kieran Bingham]

Quoting Jacopo Mondi (2023-01-26 17:11:46)
> Hi Kieran
> 
> On Wed, Jan 25, 2023 at 10:54:26AM +0000, Kieran Bingham via libcamera-devel wrote:
> > Quoting Jacopo Mondi via libcamera-devel (2023-01-25 09:05:28)
> > > From: Nicholas Roth <nicholas at rothemail.net>
> > >
> > > Support for the OmniVision OV8858 sensor is scheduled for inclusion in
> > > the Linux kernel in version v6.3.
> > >
> > > Add support for the sensor in libcamera by providing static properties
> > > and a camera sensor helper in libipa.
> > >
> > > The camera sensor helper expresses analogue gain increments in 1/128
> > > step which differs from what is reported in the sensor documentation in
> > > section "5.8 manual exposure compensation/ manual gain compensation" [0]
> > >
> > > A more detailed analysis of the sensor gain model is reported at:
> > > https://patchwork.linuxtv.org/project/linux-media/patch/20221106171129.166892-2-nicholas@rothemail.net/#142267
> > >
> > > Record with a \todo note a reference to discussion on the gain model
> > > implementation.
> > >
> > > Signed-off-by: Nicholas Roth <nicholas at rothemail.net>
> > > Signed-off-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>
> > > ---
> > >
> > > Compared to initial Nicholas' submission:
> > > - Change gain step to 128 (link to the driver discussion)
> > > - Add fadeToGray test patter and adjust comment
> > >
> > > ---
> > >  src/ipa/libipa/camera_sensor_helper.cpp    | 18 ++++++++++++++++++
> > >  src/libcamera/camera_sensor_properties.cpp | 13 +++++++++++++
> > >  2 files changed, 31 insertions(+)
> > >
> > > diff --git a/src/ipa/libipa/camera_sensor_helper.cpp b/src/ipa/libipa/camera_sensor_helper.cpp
> > > index 3d8a2835fa28..52e11dfb8ca2 100644
> > > --- a/src/ipa/libipa/camera_sensor_helper.cpp
> > > +++ b/src/ipa/libipa/camera_sensor_helper.cpp
> > > @@ -505,6 +505,24 @@ public:
> > >  };
> > >  REGISTER_CAMERA_SENSOR_HELPER("ov5693", CameraSensorHelperOv5693)
> > >
> > > +class CameraSensorHelperOv8858 : public CameraSensorHelper
> > > +{
> > > +public:
> > > +       CameraSensorHelperOv8858()
> > > +       {
> > > +               gainType_ = AnalogueGainLinear;
> > > +
> > > +               /*
> > > +                * \todo Use an increment step of 1/128 which differs from
> > > +                * what the sensor manual describes.
> >
> > This sounds like the todo is to *use* a step of 128, but isn't that what
> > it's already doing?
> >
> 
> Right :)
> 
> I can change it to
>                      * \todo Validate the selected 1/128 step value
>                      * as it differs from what the sensor manual
>                      * describes
>                      *
>                      * See: https://patchwork.linuxtv.org/project/linux-media/patch/20221106171129.166892-2-nicholas@rothemail.net/#142267
>                      */
> 
> When applying

Works for me ;-)


Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>

> 
> 
> > > +               gainConstants_.linear = { 1, 0, 0, 128 };
> > > +       }
> > > +};
> > > +REGISTER_CAMERA_SENSOR_HELPER("ov8858", CameraSensorHelperOv8858)
> > > +
> > >  class CameraSensorHelperOv8865 : public CameraSensorHelper
> > >  {
> > >  public:
> > > diff --git a/src/libcamera/camera_sensor_properties.cpp b/src/libcamera/camera_sensor_properties.cpp
> > > index c3c2caced906..7f6816e72773 100644
> > > --- a/src/libcamera/camera_sensor_properties.cpp
> > > +++ b/src/libcamera/camera_sensor_properties.cpp
> > > @@ -167,6 +167,19 @@ const CameraSensorProperties *CameraSensorProperties::get(const std::string &sen
> > >                                  */
> > >                         },
> > >                 } },
> > > +               { "ov8858", {
> > > +                       .unitCellSize = { 1120, 1120 },
> > > +                       .testPatternModes = {
> > > +                               { controls::draft::TestPatternModeOff, 0 },
> > > +                               { controls::draft::TestPatternModeColorBars, 1 },
> > > +                               { controls::draft::TestPatternModeColorBarsFadeToGray, 2 },
> > > +                               /*
> > > +                                * No corresponding test patter mode
> >
> > s/patter/pattern/
> >
> >
> > > +                                * 3: "Vertical Color Bar Type 3",
> > > +                                * 4: "Vertical Color Bar Type 4"
> > > +                                */
> > > +                       },
> > > +               } },
> > >                 { "ov8865", {
> > >                         .unitCellSize = { 1400, 1400 },
> > >                         .testPatternModes = {
> > > --
> > > 2.39.0
> > >