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In order to decode a motion-jpeg bitstream, which doesn't provide a DHT, the driver will first decode a pattern jpeg and use the DHT found in the pattern to decode the first actual frame. This mode is called "repeat-mode" and it utilizes linked descriptors. The smallest supported resolution of 64x64 was used for that pattern to not cause unneeded performance delay. This choice, however, can cause a corrupted decoded picture of the first frame after the pattern, when the resolution of that frame is larger than the pattern and is not aligned to 64. By altering the pattern size to 128x64, this corruption can be avoided. That size has been confirmed to be safe by the hardware designers. Additionally, a DMA buffer needs to be allocated to store the decoded picture of the pattern image. Signed-off-by: Ming Qian <ming.qian@oss.nxp.com> Reviewed-by: Frank Li <Frank.Li@nxp.com> Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
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 reStructuredText 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.