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A mirror of the official Linux kernel repository just in case
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The current code assumes that DMA is finished before SD access end is flagged. Thus, it schedules the 'dma_complete' tasklet in the SD card interrupt routine when DATAEND is set. The assumption is not safe, though. Even by mounting an SD card, it can be seen that sometimes DMA complete is first, sometimes DATAEND. It seems they are usually close enough timewise to not cause problems. However, a customer reported that with CMD53 sometimes things really break apart. As a result, the BSP has a patch which introduces flags for both events and makes sure both flags are set before scheduling the tasklet. The customer accepted the patch, yet it doesn't seem a proper upstream solution to me. This patch refactors the code to replace the tasklet with already existing and more lightweight mechanisms. First of all, we set the callback in a DMA descriptor to automatically get notified when DMA is done. In the callback, we then use a completion to make sure the SD access has already ended. Then, we proceed as before. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> |
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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.