linux-kernel - Re: [PATCH 4/5] dmaengine: sprd: Add Spreadtrum DMA configuration

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Message-ID: <20180416153501.GQ6014@localhost>
Date:   Mon, 16 Apr 2018 21:05:01 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Eric Long <eric.long@...eadtrum.com>,
        Mark Brown <broonie@...nel.org>, dmaengine@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] dmaengine: sprd: Add Spreadtrum DMA configuration

On Mon, Apr 16, 2018 at 02:32:05PM +0800, Baolin Wang wrote:

> >> Beside the general configuration, our audio driver will configure the
> >> fragment length, block length, maybe transaction length, and they must
> >> specify the request type and interrupt type, these are what we want to
> >> export for users.
> >
> > As I said before, you need to derive fragment, block or transaction from
> 
> I am sorry I did not make things clear here. What I mean is not only
> link list mode(prep_cyclic), but also other modes (prep_slave,
> prep_interleaved ...), users still need to configure the fragment
> length, block length or transaction length according to their
> requirements.

Other modes are similar, they also use the parameters programmed from
dma_slave_config. Pls see other driver examples. IIRC dw dma has
similar capabilities but not all are exposed to user and driver configures.

-- 
~Vinod