Re: [PATCH AUTOSEL for-4.9 04/53] spi: imx: adjust watermark level according to transfer length

[Mark Brown]

On Wed, Nov 08, 2017 at 08:49:55PM +0000, Levin, Alexander (Sasha Levin) wrote:
> From: Jiada Wang <jiada_wang@xxxxxxxxxx>
> 
> [ Upstream commit 66459c5a50a787c474b734b586328f7111ab6df0 ]
> 
> Previously DMA watermark level is configured to fifosize/2,
> DMA mode can be used only when transfer length can be divided
> by 'watermark level * bpw', which makes DMA mode not pratical.
> 
> This patch adjusts watermark level to largest number (no bigger
> than fifosize/2) which can divide 'tranfer length / bpw' for
> each transfer.

This seems like an optimization not a bug fix...

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