From: Vinod Koul <vinod.koul@intel.com>
To: Robert Baldyga <r.baldyga@samsung.com>
Cc: dan.j.williams@intel.com, lars@metafoo.de,
dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
m.szyprowski@samsung.com, k.kozlowski@samsung.com
Subject: Re: [PATCH v4 0/2] dma: pl330: improve status checking
Date: Fri, 13 Feb 2015 21:44:39 +0530 [thread overview]
Message-ID: <20150213161439.GS21387@intel.com> (raw)
In-Reply-To: <1423657398-13876-1-git-send-email-r.baldyga@samsung.com>
On Wed, Feb 11, 2015 at 01:23:16PM +0100, Robert Baldyga wrote:
> Hello,
>
> 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
prev parent reply other threads:[~2015-02-13 16:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-11 12:23 [PATCH v4 0/2] dma: pl330: improve status checking Robert Baldyga
2015-02-11 12:23 ` [PATCH v4 1/2] dma: pl330: improve pl330_tx_status() function Robert Baldyga
2015-02-11 12:23 ` [PATCH v4 2/2] dma: pl330: add DMA_PAUSE feature Robert Baldyga
2015-02-13 16:14 ` Vinod Koul [this message]
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