linux-kernel - Re: [PATCH] dmaengine: add CSR SiRFprimaII DMAC driver

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Date:	Sat, 10 Sep 2011 07:40:20 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Vinod Koul <vkoul@...radead.org>
Cc:	vinod.koul@...el.com, Jassi Brar <jassisinghbrar@...il.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"workgroup.linux@....com" <workgroup.linux@....com>,
	"rongjun.ying@....com" <rongjun.ying@....com>,
	"Baohua.Song@....com" <Baohua.Song@....com>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] dmaengine: add CSR SiRFprimaII DMAC driver

2011/9/10 Vinod Koul <vkoul@...radead.org>:
> On Fri, 2011-09-09 at 16:18 +0800, Barry Song wrote:
>> 2011/9/9 Vinod Koul <vkoul@...radead.org>:
>> > Looks like Jassi got a user for his proposed API. I am not sure whats
>> > going on with TI folks, they never showed up here @LPC.
>>
>> yes, i can definitely be an user of Jassi's new generic api. it seems
>> the api is just there for dma in 2d.
>>
>> Jassi prefer to use a transfer type instead of a control command.
>> though we will not really change the interleaved setting for every
>> transfer(it is more possible for one device, we will not change the
>> xlen/ylen/dma_width setting in the whole life period), i do believe
>> the transfer type is enough flexible for my possible applications to
>> change xlen, ylen and dma_width in different transfers.
>>
>> as we know, interleaved DMA can also be used for audio driver. for
>> some audio controllers, if there are n channels, it can't tranfer the
>> whole audio frame to sound card by one dma channel, and it needs to
>> tranfer every channel by separate dma. typically, we can define this
>> kind of xfer to skip other n-1 channel.
>>
>> Jassi, you might think my reply as an ACK to "[PATCH] DMAEngine:
>> Define generic transfer request api".
> Great, can you two redo patch along with this driver as user of new
> API :)

ok. i'll send v2 using this new API.

>
> --
> ~Vinod Koul
> Intel Corp.
>
>
-barry
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