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52ad9a8e85
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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