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

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Message-ID: <20171108205752.awsx5rzo4aecfl7i@sirena.co.uk>
Date:   Wed, 8 Nov 2017 20:57:52 +0000
From:   Mark Brown <broonie@...nel.org>
To:     "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Jiada Wang <jiada_wang@...tor.com>
Subject: Re: [PATCH AUTOSEL for-4.9 04/53] spi: imx: adjust watermark level
 according to transfer length

On Wed, Nov 08, 2017 at 08:49:55PM +0000, Levin, Alexander (Sasha Levin) wrote:
> From: Jiada Wang <jiada_wang@...tor.com>
> 
> [ 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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