linux-kernel - Re: [Query]: What should we do in txd->tx_submit() and device_issue

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Date:	Tue, 19 Jul 2011 14:38:42 +0530
From:	viresh kumar <viresh.kumar@...com>
To:	"Koul, Vinod" <vinod.koul@...el.com>
Cc:	"Williams, Dan J" <dan.j.williams@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Armando VISCONTI <armando.visconti@...com>
Subject: Re: [Query]: What should we do in txd->tx_submit() and device_issue_pending()

On 07/19/2011 02:19 PM, Koul, Vinod wrote:
> (pls wrap your email to 80lines, I have reflowed below for readability) 
>> Hi Dan/Vinod,
>>
>> I have one query regarding implementation of few routines in DMA drivers.
>>
>> What the exact purpose of txd->tx_submit() and device_issue_pending() routines?
>>
>> Should tx_submit() always start physical transfer (Obviously, if channel is
>> free)? Or should it just queue requests and then finally a call to
>> device_issue_pending() must start physical transfers?
> (reflowed your email for 80lines)

Sorry!! :(

> tx_submit is not supposed to start the transfer, it is supposed to add the 
> descriptors in dma driver's queue. The issue_pending is supposed to actually 
> start the transfer. The reasons were well articulated is discussion we had 
> when we did the DMA documentation.
> Pls see https://lkml.org/lkml/2011/5/24/530
> 

Thanks.

-- 
viresh
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