From: vinod.koul@intel.com (Vinod Koul)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] dmaengine: edma: Align the memcpy acnt array size with the transfer
Date: Thu, 21 Sep 2017 22:51:26 +0530 [thread overview]
Message-ID: <20170921172126.GJ30097@localhost> (raw)
In-Reply-To: <20170918081626.12878-1-peter.ujfalusi@ti.com>
On Mon, Sep 18, 2017 at 11:16:26AM +0300, Peter Ujfalusi wrote:
> Memory to Memory transfers does not have any special alignment needs
> regarding to acnt array size, but if one of the areas are in memory mapped
> regions (like PCIe memory), we need to make sure that the acnt array size
> is aligned with the mem copy parameters.
>
> Before "dmaengine: edma: Optimize memcpy operation" change the memcpy was set
> up in a different way: acnt == number of bytes in a word based on
> __ffs((src | dest | len), bcnt and ccnt for looping the necessary number of
> words to comlete the trasnfer.
>
> Instead of reverting the commit we can fix it to make sure that the ACNT size
> is aligned to the traswnfer.
Applied, thanks
--
~Vinod
prev parent reply other threads:[~2017-09-21 17:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-18 8:16 [PATCH v2] dmaengine: edma: Align the memcpy acnt array size with the transfer Peter Ujfalusi
2017-09-21 17:21 ` Vinod Koul [this message]
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