linux-kernel - Re: [PATCH 2/2] dma: tegra: fix residual calculation for cyclic case

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Message-ID: <4FFFB476.9050006@nvidia.com>
Date:	Fri, 13 Jul 2012 11:09:02 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Vinod Koul <vinod.koul@...ux.intel.com>
CC:	Stephen Warren <swarren@...dotorg.org>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	Stephen Warren <swarren@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 2/2] dma: tegra: fix residual calculation for cyclic case

On Friday 13 July 2012 08:45 AM, Vinod Koul wrote:
> On Mon, 2012-07-02 at 10:02 -0600, Stephen Warren wrote:
>> On 07/02/2012 02:22 AM, Laxman Dewangan wrote:
>>> In cyclic mode of DMA, the byte transferred can be more
>>> than the requested size and in this case, calculating
>>> residuals based on the current position of DMA transfer to
>>> bytes requested i.e. bytes required to transfer to reach
>>> bytes requested from current DMA position.
>>>
>>> Signed-off-by: Laxman Dewangan<ldewangan@...dia.com>
>> This makes sense to me, although I wonder if details like this aren't
>> something that the dmaengine core should be handling.
> No core doesn't know anything about the how much you are transferring
> and where you are. That is the driver to calculate and provide.

Just for confirmation, are you going to apply this patch or do I need to 
do anything here.

Thanks,
Laxman

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