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Use hardware link-list instead of soft link-list to make sure no gap among the scatter-list transfer. Merge multiple descs [first ... last] into the last desc, and drop the descs which have been merged into last one. Now we get the union one rather than a soft SGL. Obviously, this require much more MCODE buf size, because we merge multiple descs into a union one. Increase MCODE buf size if needed. e.g. -#define MCODE_BUFF_PER_REQ 256 +#define MCODE_BUFF_PER_REQ 512 or parsed from DT arm,pl330-mcbufsz-bytes = <512>; Otherwise, you may see the warning log on the long SGL situation. dma-pl330 2ab90000.dmac: pl330_submit_req: Try increasing mcbufsz (403/256) Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com> Change-Id: Iea31fc9dba08d36570d4bdbe2c5fcb61f5fed0d4
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.