linux-kernel - Re: [PATCH v2] dma: edma: Add support for Cyclic DMA

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Message-ID: <20131112034808.GB8834@intel.com>
Date:	Tue, 12 Nov 2013 09:18:08 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Joel Fernandes <joelf@...com>
Cc:	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	matt.porter@...aro.org, Dan Williams <dan.j.williams@...el.com>,
	"open list:DMA GENERIC OFFLO..." <dmaengine@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] dma: edma: Add support for Cyclic DMA

On Thu, Oct 31, 2013 at 04:31:23PM -0500, Joel Fernandes wrote:
> Using the PaRAM configuration function that we split for reuse by the
> different DMA types, we implement Cyclic DMA support.
> For the cyclic case, we pass different configuration parameters to this
> function, and handle all the Cyclic-specific functionality separately.
> 
> Callbacks to the DMA users are handled using vchan_cyclic_callback in
> the virt-dma layer. Linking is handled the same way as the slave SG case
> except for the last slot where we link it back to the first one in a
> cyclic fashion.
> 
> For continuity, we check for cases where no.of periods is great than the
> MAX number of slots the driver can allocate for a particular descriptor
> and error out on such cases.
Applied, thanks

~Vinod
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