300689fb04
In dmaengine_pcm_set_runtime_hwparams() period_bytes_min is hardcoded to 256. For some applications that may be too big. This patch changes that to calculate the value based on dma_data->maxburst. The correct value would be maxburst multiplied by the address width of the hardware FIFO. Unfortunately the address width is dynamically calculated based on the stream parameters and is not known at open time, so the worst case is chosen here which is 8 bytes, the maximum that is supported by dmaengine drivers. Not all drivers may set a maxburst value, so we fall back to the previously used hardcoded value of 256 bytes. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Link: https://lore.kernel.org/r/20220301113446.1053171-1-s.hauer@pengutronix.de Signed-off-by: Mark Brown <broonie@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.