From: Vinod Koul <vkoul@kernel.org>
To: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
Pierre-Yves MORDRET <pierre-yves.mordret@st.com>,
linux-stm32@st-md-mailman.stormreply.com,
linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org
Subject: Re: [PATCH v2] dmaengine: stm32-dma: fix residue calculation in stm32-dma
Date: Sat, 4 May 2019 15:48:23 +0530 [thread overview]
Message-ID: <20190504101823.GX3845@vkoul-mobl.Dlink> (raw)
In-Reply-To: <1556789322-7232-1-git-send-email-arnaud.pouliquen@st.com>
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
prev parent reply other threads:[~2019-05-04 10:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-02 9:28 [PATCH v2] dmaengine: stm32-dma: fix residue calculation in stm32-dma Arnaud Pouliquen
2019-05-04 10:18 ` Vinod Koul [this message]
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