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1. prepare_bam_async_desc is the function which will call all the DMA API’s. It will fetch the outstanding scatter gather list for passed channel and will do the DMA descriptor formation. The DMA flag is dependent upon the type of channel. 2. For ADM DMA, the descriptor is being formed for every DMA request so its sgl count will be always 1 while in BAM DMA, the clubbing of descriptor is being done to increase throughput. 3. ADM DMA uses only one channel while in BAM DMA, data descriptors will be submitted to tx channel (for write) or rx channel (for read) and all the registers read/write descriptors in command channel. Reviewed-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Abhishek Sahu <absahu@codeaurora.org> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.