linux-kernel - Re: [PATCH 2/6] dmaengine/dw_dmac: Enable resubmission from callback routine.

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Message-ID: <4DAD2FD3.5010103@st.com>
Date:	Tue, 19 Apr 2011 12:16:43 +0530
From:	viresh kumar <viresh.kumar@...com>
To:	"Koul, Vinod" <vinod.koul@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Armando VISCONTI <armando.visconti@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	amitgoel <amit.goel@...com>,
	"viresh.linux@...il.com" <viresh.linux@...il.com>,
	"jamie@...ieiles.com" <jamie@...ieiles.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>
Subject: Re: [PATCH 2/6] dmaengine/dw_dmac: Enable resubmission from callback
 routine.

On 04/19/2011 12:03 PM, Koul, Vinod wrote:
> On 04/19/2011 11:53 AM, viresh kumar wrote:
>> On 04/19/2011 11:42 AM, Koul, Vinod wrote:
>>> On 04/18/2011 04:20 PM, viresh kumar wrote:
>> Vinod,
>>
>> I initiated this discussion few days back on a separate thread:
>>
>> http://www.spinics.net/lists/arm-kernel/msg121139.html
>>
>> And so implemented this.
> Ahhh, on the road, catching up on email...
> 
> This was a dma engine requirement, not absolute for slave-dma.
> But would be good idea to resist this. What is your reason for this?

Mainline drivers using dmaengine are already submitting new transfers from
callback routines. For example: amba-pl011.
And i have to use pl011 with DMA, so faced this issue in dw_dmac.

-- 
viresh
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