linux-kernel - Re: [PATCH] dma: tegra: implement flags parameters for cyclic transfer

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Message-ID: <50D3E44F.4060007@nvidia.com>
Date:	Fri, 21 Dec 2012 09:53:43 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"djbw@...com" <djbw@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stephen Warren <swarren@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH] dma: tegra: implement flags parameters for cyclic transfer

On Thursday 20 December 2012 10:16 PM, Stephen Warren wrote:
> On 12/19/2012 11:11 PM, Laxman Dewangan wrote:
>> On Wednesday 19 December 2012 10:32 PM, Stephen Warren wrote:
>>> On 12/19/2012 06:40 AM, Laxman Dewangan wrote:
>>>> The flag parameter is added in the cyclic transfer request.
>>>> Use the flag option of:
>>>> - DMA_PREP_INTERRUPT for enabling interrupt.
>>>> - DMA_CTRL_ACK for deciding whether ack is requred or not for
>>>>     descriptor.
>>> Do the relevant drivers that use Tegra's DMA engine already set flags
>>> correctly, so that this change won't cause any regressions?
>>>
>> Currently, the sound soc driver uses the cyclic mode of dma transfer and
>> it has already enable the proper flags. This was done recently after
>> adding flags in cyclic api.
>> Also, there was bug in our dma driver for not setting DMA_CTRL_ACK by
>> default for cyclic case.
>> This will fix the issue.
> OK. I assume "This was done recently after adding flags in cyclic api."
> was a patch that went into 3.8?  So, this patch is a bug-fix that should
> be included in 3.8 then?
I can see this in Linux 3.7 tag.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=history;f=drivers/dma/tegra20-apb-dma.c;h=528c62dd4b00e1b52928ff66f3a54e7ae206680f;hb=29594404d7fe73cd80eaa4ee8c43dcc53970c60e
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