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In order to have a more coherent DW AHB DMA slave configuration method - dwc_config() - let's simplify the source and destination channel max-burst calculation procedure: 1. Create the max-burst verification method as it has been just done for the memory and peripheral address widths. Thus the dwc_config() method will turn to a set of the verification methods execution. 2. Since both the generic DW AHB DMA and Intel iDMA 32-bit engines support the power-of-2 bursts only, then the specified by the client driver max-burst values can be converted to being power-of-2 right in the max-burst verification method. 3. Since max-burst encoded value is required on the CTL_LO fields calculation stage, the encode_maxburst() callback can be easily dropped from the dw_dma structure meanwhile the encoding procedure will be executed right in the CTL_LO register value calculation. Thus the update will provide the next positive effects: the internal DMA-slave config structure will contain only the real DMA-transfer config values, which will be encoded to the DMA-controller register fields only when it's required on the buffer mapping; the redundant encode_maxburst() callback will be dropped simplifying the internal HW-abstraction API; dwc_config() will look more readable executing the verification functions one-by-one. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Andy Shevchenko <andy@kernel.org> Link: https://lore.kernel.org/r/20240802075100.6475-6-fancer.lancer@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org> |
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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.