linux-kernel - Re: [PATCH 1/1] spi: imx: support to set watermark level via DTS

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Message-ID: <586F5C90.5070108@mentor.com>
Date:   Fri, 6 Jan 2017 01:00:00 -0800
From:   Jiada Wang <jiada_wang@...tor.com>
To:     "Mark Brown vladimir_zapolskiy@...tor.com" <broonie@...nel.org>
CC:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] spi: imx: support to set watermark level via DTS

Hello Mark and Vladimir

On 01/05/2017 09:58 AM, Mark Brown wrote:
> On Thu, Jan 05, 2017 at 03:10:15PM +0900, Jiada Wang wrote:
>
>> Previously 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 practical.
>> This patch adds new DTS property 'dma-wml', user can configure
>> DMA watermark level, by specify 'dma-wml' in corresponding ecspi
>> node.
> Doesn't this just move the problem around a bit - can we not have the
> driver figure out a more sensible watermark for each transfer rather
> than fixing one in the DT?
I would like to submit another version of patch to adjust watermark level
based on transfer length. to use largest number (< fifosize / 2 ) which 
can divide
(transfer_length / bytes_per_work).

Thanks,
Jiada