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

[Serge Semin]

On Fri, May 08, 2020 at 06:31:34PM +0100, Mark Brown wrote:
> 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.

Ok.

-Sergey