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2020-07-03utils: raspberrypi: ctt: json_pretty_print: Add character write methodLaurent Pinchart
Add a write method to the JSONPrettyPrinter class to output a character. This will be used to handle state updates when outputting individual characters. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Tested-by: David Plowman <david.plowman@raspberrypi.com>
2020-07-03utils: raspberrypi: ctt: json_pretty_print: Skip all spacesLaurent Pinchart
Skip all white space characters, not just ' '. This makes a difference if the input JSON data is already formatted. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Tested-by: David Plowman <david.plowman@raspberrypi.com>
2020-07-03utils: raspberrypi: ctt: json_pretty_print: Make test output to stdoutLaurent Pinchart
The standalone test mode output to a file name "pretty.json". To make the test mode more versatile, output to stdout instead. The user can then decide how to use the output. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Tested-by: David Plowman <david.plowman@raspberrypi.com>
2020-07-03utils: raspberrypi: ctt: json_pretty_print: Make output file a class memberLaurent Pinchart
Instead of passing the output file to every method of the printer class, make it a class member. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Tested-by: David Plowman <david.plowman@raspberrypi.com>
2020-07-03utils: raspberrypi: ctt: json_pretty_print: Turn printer into a classLaurent Pinchart
Instead of passing a state dictionary to every method, turn the printer into a class and store the state internally. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Tested-by: David Plowman <david.plowman@raspberrypi.com>
2020-07-03utils: raspberrypi: ctt: json_pretty_print: Fix printer testLaurent Pinchart
The ctt_pretty_print_json.py file supports being run standalone to test the code. It however suffers from multiple issues: - The same input file name is hardcoded, and doesn't exist in the repository - The input file name is used instead of JSON data Fix both issues and make the input file selectable on the command line. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Tested-by: David Plowman <david.plowman@raspberrypi.com>
2020-07-03ipa: raspberrypi: Enable focus measure without recompileDavid Plowman
Previously, output of the focus measure could not be enabled without recompiling (because of the RPI_LOGGING_ENABLE macro). This uses the libcamera logging mechanism instead, so can be enabled/disabled at runtime. Signed-off-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-07-03libcamera: ipu3: cio2: Do not proxy signalNiklas Söderlund
Do not proxy the signal in the CI2Device when there is no need for it, remove it. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-07-03libcamera: ipu3: Make it easier to read when a request may be completedNiklas Söderlund
It's confusing to read the code and understand that a request is only completed before being processed by the ImgU if it only contains a single RAW buffer. Add a boolean variable with a explanatory name to make this clearer, no functional change. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-07-03libcamera: raspberrypi: Document vc_sm_cma pointer sharing with IPANiklas Söderlund
Sharing a pointer with the IPA is fragile as it will not work with all IPC mechanisms. Document that it's a temporary workaround that should be reworked. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-07-01ipa/pipeline: rkisp1: Fix spellingAndrej Shadura
Fix a typo in the word "unknown". Suggested-by: IOhannes m zmölnig <umlaeute@debian.org> Signed-off-by: Andrej Shadura <andrewsh@debian.org> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-06-29utils: raspberrypi: ctt: Fix pycodestyle W605Laurent Pinchart
W605 invalid escape sequence '\.' Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
2020-06-29libcamera: ipu3: cio2: Use Size::isNull()Niklas Söderlund
Use the Size::isNull() helper instead of using local code. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2020-06-29libcamera: geometry: Add isNull() function to Size classLaurent Pinchart
It's common for code to check if a size is null. Add a helper function to do so. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Umang Jain <email@uajain.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2020-06-29libcamera: raspberrypi: Fail on unsupported stream roleJacopo Mondi
When an unsupported stream roles is requested to generateConfiguration(), the function shall fail instead of simply ignoring the request. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2020-06-29libcamera: raspberrypi: Refuse invalid roles configurationJacopo Mondi
The generateConfiguration() implementation does not check if the requested list of roles can actually be satisfied. The camera API documentation prescribes the function shall fail in that case, instead of silently adjust the returned configuration. Fix this by implementing the same logic as the validate() function implements, as the pipeline handler supports one raw stream and up to two output streams. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2020-06-29libcamera: ipu3: Fix wrong indentationJacopo Mondi
Fix wrong parameter indent in generateConfiguration() function implementation. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2020-06-29libcamera: ipu3: Accept an empty roles listJacopo Mondi
The IPU3 pipeline handler that does not support receiving an empty list of roles at generateConfiguration() time. This contradicts the camera API which allows application to generate empty CameraConfiguration to be later manually filled. Fix this by returning an empty CameraConfiguration if the list of requested roles is empty. While at it, align the style with the other pipeline handlers. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2020-06-29libcamera: ipu3: Improve error on multiple raw streams requestJacopo Mondi
Improve the error message emitted when multiple raw streams are requested. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2020-06-28libcamera: ipu3: imgu: Use unique_ptr for video and subdevicesNiklas Söderlund
Instead of manually deleting the video and subdevices in the destructor use std::unique_ptr. Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: imgu: Remove ImgUOutputNiklas Söderlund
The struct ImgUOutput now only contains one member that is in use, the video device. Remove the struct and use the video device directly instead. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: Remove IPU3StreamNiklas Söderlund
The pipeline specific subclass of the pipeline is empty, remove it. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: Remove the active flag from IPU3StreamNiklas Söderlund
The active_ flag is only used inside one function, remove the global flag and handle it inside the single function. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2020-06-28libcamera: ipu3: Do not duplicate data in IPU3StreamNiklas Söderlund
Do not keep the duplicated ImgUDevice::ImgUOutput information in both the stream and camera data classes. Remove it from the stream and only access it from the camera data class. Which stream is which can instead be checked by comparing it to the known streams in camera data. This match how streams are checked in other parts of the code making the pipeline more coherent. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: imgu: Use specific functions to configure each sinkNiklas Söderlund
When the IPU3 pipeline only provided streams to applications that came from the ImgU it made sense to have a generic function to configure all the different outputs. With the addition of the RAW stream this begins to be cumbersome to read and make sense of in the PipelineHandlerIPU3 code. Replace the generic function that takes a specific argument for which sink to configure with a specific function for each sink. This makes the code easier to follow as it's always clear which of the ImgU sinks are being configured without knowing the content of a generically named variable. It also paves the way for future improvements. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: imgu: Mark things that are internal as privateNiklas Söderlund
Mark all variables and functions that are only used internally as private. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: imgu: Do not cache indexNiklas Söderlund
The numerical index of the imgu is only used to create its name in string form. There is no need to keep it around after that, remove it. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: imgu: Move the ImgUDevice class to separate filesNiklas Söderlund
In preparation of refactoring the IPU3 pipeline handler breakout the ImgUDevice into its own .cpp and .h file, no functional change. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: Remove usage of IPU3CameraData from ImgUDeviceNiklas Söderlund
The IPU3CameraData argument to allocateBuffers() and freeBuffers() is no longer used and can be removed. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: Always import buffers for ImgU sinksNiklas Söderlund
When the IPU3 pipeline was first developed sinks of the ImgU that where not active still needed to have buffers allocated to allow streaming to start. This is no longer true, it's enough that the sinks have imported buffers to allow streaming to start. As we already need to import buffers for stream that are active we can align the two cases and always import buffers. With this there is no longer a reason to store the allocated FrameBuffers to keep them alive and the vector tracking them can be removed. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: Import instead of allocate statistic buffersNiklas Söderlund
Statistics buffers are not yet used by the IPU3 pipeline, they are never queued to the statistics video device or in any other way consumed. The kernel driver will however not allow video streaming to start if buffers are not either allocated or imported on the statistics video device. Instead of allocating the buffers wasting memory that is never used, import buffers. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-28libcamera: ipu3: Remove unused name_ filed from IPU3StreamNiklas Söderlund
The field is never used, remove it. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: Summarize licensing terms in COPYING.rstLaurent Pinchart
Storing detailed licensing information in SPDX headers and in the DEP5 file gives precise information to handle license compliance, but lacks a high-level overview. Summmarize the licensing terms in a COPYING.rst file to facilitate understanding of the libcamera project licenses, and to clarify that closed-source third-party IPA modules are permitted. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Acked-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Tomasz Figa <tfiga@chromium.org>
2020-06-26libcamera: ipu3: Allow zero-copy RAW stream captureNiklas Söderlund
With the refactored CIO2 interface it's now easy to add zero-copy for buffers in the RAW stream. Use the internally allocated buffers inside the CIO2Device if no buffer for the RAW stream is provided by the application, or use the application-provided buffer if any. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: ipu3: cio2: Hide buffer allocation and freeing from usersNiklas Söderlund
The allocation and freeing of buffers for the CIO2 is handled in the IPU3 pipeline handlers start() and stop() functions. These functions also call CIO2Device start() and stop() at the appropriate times so move the CIO2 buffer allocation/freeing inside the CIO2Device and reduce the complexity of the exposed interface. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: ipu3: cio2: Make the V4L2 devices privateNiklas Söderlund
In order to make the CIO2 easier to extend with new features make the V4L2 devices (sensor, CIO2 and video device) private members. This requires a few helper functions to be added to allow for the IPU3 driver to still be able to interact with all parts of the CIO2. These helper functions will later be extended to add new features to the IPU3 pipeline. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: ipu3: cio2: Add function to generate configurationNiklas Söderlund
Collect the code used to generate configurations for the CIO2 block in the CIO2Device class. This allows simplifying the code and allow further changes to only happen at one code location. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: ipu3: cio2: Consolidate information about formatsNiklas Söderlund
Instead of spreading the mapping between media bus codes and V4L2 FourCC all over the CIO2 code collect it in a single map and extract the data from it. This is done in preparation of adding PixelFormat information to the mix. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: ipu3: cio2: Move the CIO2Device class to separate filesNiklas Söderlund
In preparation of refactoring the IPU3 pipeline handler breakout the CIO2Device into its own .cpp and .h file, no functional change. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: ipu3: Calculate number of buffers for ImgUNiklas Söderlund
Decouple the number of buffers to allocate for the ImgU from the number of buffers allocated for the CIO2. Instead of blindly following the CIO2 pick the maximum number of buffers requested for any stream facing applications. This is potentially wasteful, as each stream could allocate just as many buffers as requested by the application instead of the maximum from the set. But this is not more wasteful than what is already used by the pipeline and should be fixed on top after the decoupling of the two processing units. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: ipu3: Breakout stream assignment to new functionNiklas Söderlund
Selecting which stream is the most suitable for the requested configuration is mixed with adjusting the requested format when validating configurations. This is hard to read and got worse when support for Bayer formats was added. Break it out to a separate function. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2020-06-26libcamera: ipu3: Fold mediaBusToFormat() into only callerNiklas Söderlund
Make the code easier to read and refactor. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-26libcamera: pipeline_handler: Correct small typo in acquireMediaDevice ↵Chris Chinchilla
description Correct a small typo in the method description. Fixes: d6a88607479 ("libcamera: pipeline_handler: Keep track of MediaDevice") Signed-off-by: Chris Chinchilla <chris@gregariousmammal.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-06-26libcamera: pipeline_handler: Fix incorrect method in CameraData docsChris Chinchilla
The pipeline handler documentation incorrectly references an old API usage of setCameraData, which should have been updated to registerCamera() while updating pipeline handlers to ensure they all have a pipeline-specific "CameraData" allocation. Update the remaining documentation reference. Fixes: b581b9576abd ("libcamera: pipeline_handler: Make pipeline-specific data mandatory") Signed-off-by: Chris Chinchilla <chris@gregariousmammal.com> Reviewed-by: Umang Jain <email@uajain.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-06-25libcamera: pipeline: raspberrypi: Add StreamFormats to StreamConfigurationNaushir Patuck
In generateConfiguration(), add the device node specific formats to the StreamConfiguration for each StreamRole requested. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-25ipa: rpi: Add "focus" algorithmDavid Plowman
Adds FocusStatus to the image metadata, containing contrast measurements across the image. Optionally also prints a contrast measure to the console, to aid in manual adjustment of the lens. Note that it is not an actual auto-focus algorithm that can drive a lens! Signed-off-by: David Plowman <david.plowman@raspberrypi.com> Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-25v4l2: v4l2_camera_proxy: Serialize accesses to the proxyPaul Elder
Make the V4L2 compatibility layer thread-safe by serializing accesses to the V4L2CameraProxy with a lock. Release the lock when blocking for dqbuf. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-25v4l2: v4l2_camera_proxy: Fix buffer flags related to queueingPaul Elder
Fix buffer flags related to queueing and dequeueing: - don't allow a buffer with the same index that is already in the queue to be enqueued again - don't clear the done flag upon qbuf - do clear the done flag upon dqbuf - set the flags in V4L2CameraProxy's internal buffers, and not just in the buffers returned from qbuf Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-25v4l2: v4l2_camera_proxy: Don't allow buffers to be freed if still mmapedPaul Elder
In VIDIOC_REQBUFS with count = 0, if the buffers are still mmaped, they should not be allowed to be freed. Add a check for this. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-06-25v4l2: v4l2_camera_proxy: Don't allow streamon if no buffers have been requestedPaul Elder
Make VIDIOC_STREAMON return -EINVAL if no buffers have been allocated with reqbufs. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>