linux-kernel - Re: [PATCH v2 0/2] dma: pl330: improve status checking

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Date:	Tue, 9 Dec 2014 14:46:09 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Robert Baldyga <r.baldyga@...sung.com>
Cc:	dan.j.williams@...el.com, lars@...afoo.de,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	m.szyprowski@...sung.com, l.czerwinski@...sung.com,
	kyungmin.park@...sung.com, k.kozlowski@...sung.com,
	padma.kvr@...il.com
Subject: Re: [PATCH v2 0/2] dma: pl330: improve status checking

On Fri, Dec 05, 2014 at 09:25:53AM +0100, Robert Baldyga wrote:
> Hi,
> 
> This series allows to check DMA transfer residue (number of bytes left
> to send/receive) by modifying pl330_tx_status() function, when struct
> dma_tx_state is filled with needed data. It also introduces DMA_PAUSE
> feature, which allows to halt DMA transfer before termination and read
> residue without risk of data loss.
> 
> This features are needed for proper implementation of DMA transfers,
> particulary for serial drivers when transfer sizes are unknown and
> requests on DMA channels are terminated before transfer completion
> very ofter (it's becouse we terminate then in timeout interrupt to
> avoid latency which is usually undesirable).
Applied, thanks

-- 
~Vinod

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