linux-kernel - Re: [PATCHv5] DMAEngine: Define interleaved transfer request api

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Message-ID: <1318599079.1546.395.camel@vkoul-udesk3>
Date:	Fri, 14 Oct 2011 19:01:19 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Jassi Brar <jaswinder.singh@...aro.org>
Cc:	Barry Song <21cnbao@...il.com>, linux-kernel@...r.kernel.org,
	dan.j.williams@...el.com, rmk@....linux.org.uk,
	DL-SHA-WorkGroupLinux <workgroup.linux@....com>
Subject: Re: [PATCHv5] DMAEngine: Define interleaved transfer request api

On Fri, 2011-10-14 at 17:21 +0530, Jassi Brar wrote:
> On 14 October 2011 13:02, Barry Song <21cnbao@...il.com> wrote:
> >
> > what if i want a cyclic interleaved transfer? i think the cyclic
> > interleaved transfer is what i want for audio dma.
> >
> ... we need to restore 'bool frm_irq' and add new 'bool cyclic' that
> would replay the transfer(i.e, reset dma-pointers to src_start & dst_start)
> after 'numf' frames have been transferred.
I was thinking more on lines to have this conveyed thru a flag.

Anyway I plan to work on merging device_prep_slave_sg and
device_prep_cyclic to single API. Think more of device_prep_cyclic as
special case with sg length one and flag to tell dmac its cyclic.

Similarly here we could use/define this flag to say this transfer is
also cyclic in nature and dmac then reloads the list again.
That way any prep can be made cyclic in nature by just using this flag.

@Barry: Why would you need to use interleaved API for audio?

-- 
~Vinod

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