From: Andy Gross <agross@codeaurora.org>
To: Mark Brown <broonie@kernel.org>
Cc: linux-spi@vger.kernel.org, Sagar Dharia <sdharia@codeaurora.org>,
Daniel Sneddon <dsneddon@codeaurora.org>,
Bjorn Andersson <bjorn.andersson@sonymobile.com>,
"Ivan T. Ivanov" <iivanov@mm-sol.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH] spi: qup: Add DMA capabilities
Date: Fri, 27 Jun 2014 10:54:22 -0500 [thread overview]
Message-ID: <20140627155422.GA13621@qualcomm.com> (raw)
In-Reply-To: <20140627105057.GF23300@sirena.org.uk>
On Fri, Jun 27, 2014 at 11:50:57AM +0100, Mark Brown wrote:
> On Thu, Jun 26, 2014 at 04:06:21PM -0500, Andy Gross wrote:
>
> > + if (xfer->rx_buf) {
> > + rx_dma = dma_map_single(controller->dev, xfer->rx_buf,
> > + xfer->len, DMA_FROM_DEVICE);
>
> It would be better to use the core DMA mapping code rather than open
> coding. This code won't work for vmalloc()ed addresses, or physically
> non-contiguous addresses unless there's an IOMMU fixing things up.
Ah, ok. So I just need a to setup the scatter gather page list and then do a
dma_map_sg. I'll resend once I have this in place.
--
sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
WARNING: multiple messages have this Message-ID (diff)
From: agross@codeaurora.org (Andy Gross)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] spi: qup: Add DMA capabilities
Date: Fri, 27 Jun 2014 10:54:22 -0500 [thread overview]
Message-ID: <20140627155422.GA13621@qualcomm.com> (raw)
In-Reply-To: <20140627105057.GF23300@sirena.org.uk>
On Fri, Jun 27, 2014 at 11:50:57AM +0100, Mark Brown wrote:
> On Thu, Jun 26, 2014 at 04:06:21PM -0500, Andy Gross wrote:
>
> > + if (xfer->rx_buf) {
> > + rx_dma = dma_map_single(controller->dev, xfer->rx_buf,
> > + xfer->len, DMA_FROM_DEVICE);
>
> It would be better to use the core DMA mapping code rather than open
> coding. This code won't work for vmalloc()ed addresses, or physically
> non-contiguous addresses unless there's an IOMMU fixing things up.
Ah, ok. So I just need a to setup the scatter gather page list and then do a
dma_map_sg. I'll resend once I have this in place.
--
sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2014-06-27 15:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-26 21:06 [PATCH] spi: qup: Add DMA capabilities Andy Gross
2014-06-26 21:06 ` Andy Gross
2014-06-27 10:50 ` Mark Brown
2014-06-27 10:50 ` Mark Brown
2014-06-27 15:54 ` Andy Gross [this message]
2014-06-27 15:54 ` Andy Gross
2014-06-27 16:24 ` Russell King - ARM Linux
2014-06-27 16:24 ` Russell King - ARM Linux
[not found] ` <20140627162411.GO32514-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2014-06-27 18:58 ` Andy Gross
2014-06-27 18:58 ` Andy Gross
2014-06-27 18:58 ` Andy Gross
[not found] ` <1403816781-31008-1-git-send-email-agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-07-02 14:26 ` Ivan T. Ivanov
2014-07-02 14:26 ` Ivan T. Ivanov
2014-07-02 14:26 ` Ivan T. Ivanov
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