[PATCH V2] mxs: spi: clear XFER_COUNT in ctrl0 field in DMA descriptor

[marex@denx.de (Marek Vasut)]

Dear Juha Lumme,

> On MX23 the XFER_COUNT part in ctrl0 field in DMA descriptor was improperly
> OR'd during the construction of DMA descriptor chain, instead of being
> freshly set.
> Because of that too many bytes were being expected from SPI during the last
> DMA cycle.
> This caused a timeout (SSP_TIMEOUT) to happen in the processing of the last
> DMA descriptor, and thus reads and writes were failing.
> This is a fix for the problem, by clearing XFER_COUNT bytes in ctrl0 before
> setting the new XFER_COUNT for DMA descriptor.
> 
> Cc: Marek Vasut <marex@denx.de>
> Cc: Fabio Estevam <fabio.estevam@freescale.com>
> Cc: Shawn Guo <shawn.guo@linaro.org>
> 
> Signed-off-by: Juha Lumme <juha.lumme@gmail.com>
> Acked-by: Marek Vasut <marex@denx.de>

Bump? This is stable matter too.

Best regards,
Marek Vasut