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At any time, a DMA transfer can be suspended to be restarted later before the end of the DMA transfer. In order to restart from the point where the transfer was stopped, DMA_SxNDTR has to be read after disabling the channel by clearing the EN bit in DMA_SxCR register, to know the number of data items already collected. Peripheral and/or memory addresses have to be updated in order to adjust the address pointers. SxNDTR register has to be updated with the remaining number of data items to be transferred (the value read when the channel was disabled). Then the channel can be re-enabled to resume the transfer from the point it was suspended. If the channel was configured in circular or double-buffer mode, the circular or double-buffer mode must be disabled before re-enabling the channel to be able to reconfigure SxNDTR register and re-activate circular or double-buffer mode on next Transfer Complete interrupt where channel will be disabled by HW. This is due to the fact that on resume, re-writing SxNDTR register value updates internal HW auto-reload data counter, and then it truncates all next transfers after a pause/resume sequence. Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> Link: https://lore.kernel.org/r/20220505115611.38845-5-amelie.delaunay@foss.st.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 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.