78ba0d79b7
As a top MC video driver, the microchip-isc should not propagate the format to the subdevice, it should rather check at start_streaming() time if the subdev is properly configured with a compatible format. Removed the whole format finding logic, and reworked the format verification at start_streaming time, such that the ISC will return an error if the subdevice is not properly configured. To achieve this, media_pipeline_start is called and a link_validate callback is created to check the formats. With this being done, the module parameter 'sensor_preferred' makes no sense anymore. The ISC should not decide which format the sensor is using. The ISC should only cope with the situation and inform userspace if the streaming is possible in the current configuration. The redesign of the format propagation has also risen the question of the enumfmt callback. If enumfmt is called with an mbus_code, the enumfmt handler should only return the formats that are supported for this mbus_code. Otherwise, the enumfmt will report all the formats that the ISC could output. With this rework, the dynamic list of user formats is removed. It makes no more sense to identify at complete time which formats the sensor could emit, and add those into a separate dynamic list. The ISC will start with a simple preconfigured default format, and at link validate time, decide whether it can use the format that is configured on the sink or not. >From now on, the driver also advertises the IO_MC capability. Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.