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The snps,block-size DT property declares the maximum block size for each channel of the dw-axi-dmac. However, the driver ignores these when setting max_seg_size and uses MAX_BLOCK_SIZE (4096) instead. To take advantage of the efficiencies of larger blocks, calculate the minimum block size across all channels and use that instead. See: https://github.com/raspberrypi/linux/issues/6256 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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.
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