Entities access various piece of information from the subdev state when
configuring a partition. The same data is available through the
partition structure passed to the .configure_partition() operation. Use
it to avoid accessing the state, which will simplify moving to the V4L2
subdev active state API.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The DRM pipelines don't partition frames, as the hardware operates
synchronously with the display. The entity operations access
configuration data from the entity state in that case, instead of
accessing the partition structure. This requires special cases in
entity-specific code, increasing the driver complexity.

To prepare for simplifying the code, initialize a single partition for
the DRM pipelines, similarly to how video pipelines create one partition
spanning the full image when partitioning isn't needed. The partition is
allocated statically in the vsp1_drm_pipeline structure instead of
dynamically as for video pipelines, as DRM pipelines are guaranteed to
operate on a single partition.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

Some of the code that handles pipeline configuration assumes that
entities in a pipeline's entities list are sorted from sink to source.
To prepare for using that code with the DRM pipeline, insert the BRx
just before the WPF, and the RPFs at the head of the list.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

It is useful for debugging purpose to dump a vsp1_pipeline to the kernel
log. Add a new function to do so, and use it when initializing the video
and DRM pipelines.

As __vsp1_pipeline_dump() needs to construct the log message
iteratively, it uses pr_cont(...) (exact equivalent to the more verbose
"printk(KERN_CONT ..."). The function thus can't use dev_dbg() to log
the initial part of the message, for two reasons:

- pr_cont() doesn't seem to work with dev_*(). Even if the format string
  passed to dev_*() doesn't end with a '\n', pr_cont() starts a new line
  in the log. This behaviour doesn't seem to be clearly documented, and
  may or may not be on purpose.

- Messages printed by dev_dbg() may be omitted if dynamic debugging is
  enabled. In that case, the continuation messages will still be
  printed, leading to confusing log messages.

To still benefit from the dynamic debug infrastructure, we declare a
vsp1_pipeline_dump() macro that uses _dynamic_func_call() when dynamic
debugging is enabled. The whole vsp1_pipeline_dump() call can be
selected at runtime. The __vsp1_pipeline_dump() function then uses a
plain "printk(KERN_DEBUG ...)" to print the message header using the
debug log level, and pr_cont() to print the rest of the message on the
same line.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The vsp1_partition_window structure is used to store the horizontal size
of a partition window. This is all that is currently needed, as all
partitions span the whole image vertically. The horizontal window size
is retrieved in the .configure_partition() handler from the
vsp1_partition_window structure, and the vertical window size from the
subdev state.

Accessing the subdev state in the .configure_partition() handler is
problematic in the context of moving to the V4L2 subdev active state
API, as .configure_partition() is called in non-interruptable context,
and the state lock can't be taken. To avoid this, start by storing the
vertical size in the window, replacing the custom vsp1_partition_window
structure with a v4l2_rect. Retrieving the vertical size from the window
in .configure_partition() will be done in a subsequent change.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The entity .configure_partition() function operates on a partition, and
has to retrieve that partition from the pipeline's current partition
field. Pass the partition pointer to the function to make it clearer
what partition it operates on, and remove the vsp1_pipeline.partition
field.

This change clearly shows that the DRM pipeline doesn't use partitions,
which makes entity implementation more complex and error-prone. This
will be addressed in a further cleanup.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The vsp1_partition structure stores the RPF partition configuration in a
single field for all RPF instances, while each RPF can have its own
configuration. Fix it by storing the configuration separately for each
RPF instance.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Fixes: ab45e858 ("media: v4l: vsp1: Allow entities to participate in the partition algorithm")
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

When calculation a partition in vsp1_pipeline_calculate_partition(),
there is no need to handle the case where the whole image is covered by
a single partition locally. In that case, the index and div_size
parameters are 0 and format->width respectively, which makes the general
code behave exactly as the special case. Drop the special case.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The partition calculation code, located in vsp1_video.c, is not specific
to video pipelines. To prepare for its usage in DRM pipelines, move it
to vsp1_pipe.c.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The histogram module is the only one that has a custom .get_fmt()
handler, to handle the special case of the output format being fixed.
This can equally well be handled in the .set_fmt() handler instead.
Beside avoiding special cases and using the same .get_fmt() handler in
all modules, it ensures that the correct format is stored in the active
state for the source pad, including when .set_fmt() is called from
vsp1_entity_init_state(). Both are needed to later switch to the V4L2
subdev active state API.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The brx_get_compose() function is just a wrapper around
v4l2_subdev_state_get_compose() without any added value. Drop it and
call v4l2_subdev_state_get_compose() directly.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The vsp1_rwpf_get_crop() function is just a wrapper around
v4l2_subdev_state_get_crop() without any added value. Drop it and call
v4l2_subdev_state_get_crop() directly.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The vsp1_entity_get_pad_selection() function is just a wrapper around
v4l2_subdev_state_get_crop() or v4l2_subdev_state_get_compose() without
any added value. Drop it and call the functions it wraps directly.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

The vsp1_entity_get_pad_format() function is just a wrapper around
v4l2_subdev_state_get_format() without any added value. Drop it and call
v4l2_subdev_state_get_format() directly.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

When formats don't match between a subdev and a connected video device,
starting streaming returns an error without giving the user any
indication as to what went wrong. To help debugging pipeline
misconfigurations, add a debug message that indicates the cause of the
failure.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

The v4l2_subdev_link_validate_get_format() function warns if the pad
given as argument belongs to a non-subdev entity. This can't happen, as
the function is called from v4l2_subdev_link_validate() only (indirectly
through v4l2_subdev_link_validate_locked()), and that function ensures
that both ends of the link are subdevs.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

The static __enqueue_in_driver() function is forward-declared
needlessly, as it isn't called before its definition. Drop the forward
declaration.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>

The histogram support mixes _irqsave and _irq, causing the following
smatch warning:

     drivers/media/platform/renesas/vsp1/vsp1_histo.c:153 histo_stop_streaming()
     warn: mixing irqsave and irq

The histo_stop_streaming() calls spin_lock_irqsave() followed by
wait_event_lock_irq(). The former hints that interrupts may be disabled
by the caller, while the latter reenables interrupts unconditionally.
This doesn't cause any real bug, as the function is always called with
interrupts enabled, but the pattern is still incorrect.

Fix the problem by using spin_lock_irq() instead of spin_lock_irqsave()
in histo_stop_streaming(). While at it, switch to spin_lock_irq() and
spin_lock() as appropriate elsewhere.

Fixes: 99362e32 ("[media] v4l: vsp1: Add histogram support")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-renesas-soc/164d74ff-312c-468f-be64-afa7182cd2f4@moroto.mountain/Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Use the frame interval stored in the subdev state instead of storing
a copy in the driver private structure.

Initialize the frame interval to the special case 0/0 that in the
max9286 driver represents automatic handling of frame sync.

As the frame sync mode is set at s_stream() time, we can remove it
from max9286_setup().
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20240617161135.130719-12-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Use the subdev active state in the max9286 driver to store the
image format.

Replace the .open() function call with the .init_state() one and
simplify the set/get_pad_fmt() operations.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20240617161135.130719-11-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

The max9286 driver supports multiple output formats but only a single
one is reported through the .enum_mbus_code operation.

Fix that.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20240617161135.130719-10-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Initialize and use the subdev active state to store the subdevice
format.

This simplifies the implementation of the get_fmt and set_fmt pad
operations.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-9-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

The adv748x-csi2 driver configures the CSI-2 transmitter to
automatically infer the image stream format from the connected
frontend (HDMI or AFE).

Setting a new format on the subdevice hence does not actually control
the CSI-2 output format, but it's only there for the purpose of
pipeline validation.

However, there is currently no validation that the supplied media bus
code is valid and supported by the device.

With the introduction of enum_mbus_codes a list of supported format is
now available, use it to validate that the supplied format is correct
and use the default UYVY8 one if that's not the case.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20240617161135.130719-8-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Now that the adv748x CSI-2 transmitter driver validates the supported
formats, it is required for subdevices along the pipeline to produce
and consume the same media bus codes.

The adv748x analog front end driver use the 2X8 variant of the UYVY8
media bus code, while the CSI-2 transmitter use the 1X16 variant, which
is the correct one to use for the serial bus.

Make the adv748x afe use the 1X16 format variant to maintain the
pipeline validation correct.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-7-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Define a list of supported mbus codes for the TXA and TXB CSI-2
transmitters and implement the enum_mbus_code operation.

The TXB transmitter only support YUV422 while the TXA one supports
multiple formats as reported by the chip's manual in section 9.7.
but the HDMI and AFE subdevices only provide RGB888 and YUV422, so only
list those ones here.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-6-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Create the subdevice state with v4l2_subdev_init_finalize() and
implement the init_state() operation to guarantee the state is initialized.

Store the current image format in the subdev active state and remove it
from the driver private structure.

To guarantee the same image format is applied to all source pads,
propagate the format from the sink pad to the sources, disallowing
changing format on a source pad.

To support both gen3 and gen4, which feature a different number of
source pads, introduce an helper function to return the correct number
of pads.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-5-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Cleanup the V4L2 subdevice in the driver's remove function to
ensure its async connection are freed, and guarantee in future that
the subdev active state is cleaned up.

Fixes: 769afd21 ("media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-4-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Disable pm_runtime in the probe() function error path.

Fixes: 769afd21 ("media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-3-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

The YUYV8_1X16 and UYVY8_1X16 formats are treated as 'ITU-R
BT.601/BT.1358 16-bit YCbCr-422 input' (YUV16 - 0x5) in the R-Car VIN
driver and are thus disallowed when capturing frames from the R-Car
CSI-2 interface according to the hardware manual.

As the 1X16 format variants are meant to be used with serial busses they
have to be treated as 'YCbCr-422 8-bit data input' (0x1) when capturing
from CSI-2, which is a valid setting for CSI-2.

Commit 78b3f9d7 ("media: rcar-vin: Add check that input interface
and format are valid") disallowed capturing YUV16 when using the CSI-2
interface. Fix this by using YUV8_BT601 for YCbCr422 when CSI-2 is in
use.

Fixes: 78b3f9d7 ("media: rcar-vin: Add check that input interface and format are valid")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-2-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/media/v4l2-core/v4l2-async.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/media/v4l2-core/v4l2-fwnode.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Replace instance of of_node_put with __free(device_node)
to protect against any memory leaks due to future changes
in control flow.
Signed-off-by: Abdulrasaq Lawani <abdulrasaqolawani@gmail.com>
Acked-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Rename 'st-vgxy61' to 'vgxy61', dropping the vendor prefix to follow the
same naming scheme as the vast majority of device drivers.
The device tree binding does not fall into binding rename exceptions and
therefore must not be changed. Keep its legacy name.
Signed-off-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

It was reported to me that the imx219 didn't work on one of our
development kits partly because the access sequence is incorrect.
The datasheet I could find [1] for this camera has the access sequence:
Seq. No. Address (Hex) data
1        30EB          05
2        30EB          0C
3        300A          FF
4        300B          FF
5        30EB          05
6        30EB          09

but the driver swaps the first two elements. Laurent pointed out on IRC
that the original code used the correct sequence for 1920x1080 but the
current sequence for 3280x2464 and 1640x1232. During refactoring of the
init sequence the current order was used for all formats.

Switch to using the documented sequence.

Link: https://www.opensourceinstruments.com/Electronics/Data/IMX219PQ.pdf [1]
Fixes: 85084559 ("media: i2c: imx219: Split common registers from mode tables")
Fixes: 1283b3b8 ("media: i2c: Add driver for Sony IMX219 sensor")
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Adam Ford <aford173@gmail.com>  #imx8mp-beacon-kit
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

The ov2680 driver has 9 controls now and the call to
v4l2_ctrl_new_fwnode_properties() adds 2 more.

Tell v4l2_ctrl_handler_init() to pre-allocate space for 11
controls to match this.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

The out of tree IPU6 driver comes with its own copy of the ipu-bridge code.
It also comes bundled with standard v4l2 sensor drivers. Many of these have
been mainlined and the rest is being mainlined but not all are upstream
yet.

The latest version of the out of tree code now will use the mainline kernel
ipu-bridge version when build against new enough kernels.

This however breaks support for (bundled) sensor drivers which do not (yet)
have an entry in the mainline ipu-bridge code.

Add the missing entries to the mainline ipu-bridge code to make
the transition to having everything in mainline easier.

The alternative HID for the OV13B10 and the OV08x40 entries both are for
sensors already supported in mainline which were missing.

The downside of adding these HIDs is that this will cause the IPU3 / IPU6
drivers to delay registering there /dev/video# nodes until a sensor driver
has bound, which for the non mainline drivers may never happen. This is
not really an issue because almost all IPU designs only have front (user)
facing sensors and all the added HIDs are for the main RGB (not IR) sensor.
So if the sensor driver is missing then the user can already not use
the camera and adding these HIDs does not really change that.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Sort the sensors in ipu_supported_sensors[] by ACPI HID rather then having
them in some random order.

While at it also use the correct (same as datasheet) capitalization
for the sensor names in the comments. Instead of sometimes writing
OV#### and sometimes ov####.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Into alvium cameras REG_BCRM_GAIN_RW control the analog gain.
Let's use the right V4L2_CID_ANALOGUE_GAIN ctrl.

Fixes: 0a7af872 ("media: i2c: Add support for alvium camera")
Cc: stable@vger.kernel.org
Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Implement the enum_frame_size pad operation.
The sensor supports a continuous size range of resolutions.
Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Alvium camera by default is in free running mode. Datasheet say that
acquisition frame rate reg can only be used if frame start trigger
mode is set to off.
Enable r/w acquisition frame rate and turn off trigger mode.
Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
[Sakari Ailus: Fix spelling of "acquisition".]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Acquisition frame rate enable reg have a very long name let's reduce this
with an abbreviation.
Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
[Sakari Ailus: Fix spelling of "acquisition".]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>