Re: [PATCH 08/17] spi: dw: Clear DMAC register when done or stopped

[Mark Brown]

On Fri, May 08, 2020 at 04:29:33PM +0300, Serge Semin wrote:
> If DMAC register is left uncleared any further DMAless transfers
> may cause the DMAC hardware handshaking interface getting activated.
> So the next DMA-based Rx/Tx transaction will be started right
> after the dma_async_issue_pending() method is invoked even if no
> DMATDLR/DMARDLR conditions are met. This at the same time may cause
> the Tx/Rx FIFO buffers underrun/overrun. In order to fix this we
> must clear DMAC register after a current DMA-based transaction is
> finished.

This also looks like a bugfix so should be pulled forwards to the start
of the series if possible.

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