From: Vinod Koul <vinod.koul@intel.com>
To: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: "Dan Williams" <dan.j.williams@intel.com>,
"Magnus Damm" <magnus.damm@gmail.com>,
"Laurent Pinchart" <laurent.pinchart+renesas@ideasonboard.com>,
"Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>,
dmaengine@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH v2] dmaengine: rcar-dmac: Widen DMA mask to 40 bits
Date: Tue, 14 Feb 2017 13:24:19 +0530 [thread overview]
Message-ID: <20170214075418.GO2843@localhost> (raw)
In-Reply-To: <1486983626-10744-1-git-send-email-geert+renesas@glider.be>
On Mon, Feb 13, 2017 at 12:00:26PM +0100, Geert Uytterhoeven wrote:
> By default, the DMA mask covers only the low 32-bit address space, which
> causes SWIOTLB on arm64 to fall back to a bounce buffer for DMA
> transfers involving memory outside the 32-bit address space.
>
> The R-Car DMA controller hardware supports a 40-bit address space, hence
> widen the DMA mask to 40 bits to actually make use of this feature.
Applied, thanks
--
~Vinod
prev parent reply other threads:[~2017-02-14 7:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-13 11:00 [PATCH v2] dmaengine: rcar-dmac: Widen DMA mask to 40 bits Geert Uytterhoeven
2017-02-14 7:54 ` Vinod Koul [this message]
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