linux-kernel - Re: [PATCH v2] dmaengine: stm32-dma: fix residue calculation in stm32-dma

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Message-ID: <20190504101823.GX3845@vkoul-mobl.Dlink>
Date:   Sat, 4 May 2019 15:48:23 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Pierre-Yves MORDRET <pierre-yves.mordret@...com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v2] dmaengine: stm32-dma: fix residue calculation in
 stm32-dma

On 02-05-19, 11:28, Arnaud Pouliquen wrote:
> In double buffer mode, during residue calculation, the DMA can
> automatically switch to the next transfer. Indeed the CT bit that
> gives position in the double buffer can has been updated by the
> hardware, during calculation.
> In this case the SxNDTR register value can not be trusted.
> If a transition is detected we consider that the DMA has switched to
> the beginning of next sg.

Applied, thanks

-- 
~Vinod