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Date:   Thu, 17 Jan 2019 09:47:28 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] arm64: dts: qcom: sdm845: Extend ranges and
 describe DMA space

Hi,

On Wed, Jan 16, 2019 at 8:30 PM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> For devices attached to an IOMMU, translation between IOVA and physical
> addresses is no longer 1:1 and dma-ranges should be specified to
> describe the available IOVA address space.
>
> On SDM845 the busses are implemented with 36 address bits, so dma-ranges
> must be defined to reduce the size of the IOVA address space from the 48
> bits supported by the SMMU. Without this DMA allocations may end up with
> IOVAs outside the valid range, that gets truncated by the bus between
> the device and its translation unit.
>
> Also extend ranges to describe the available address space.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>
> Changes since v3:
> - Split this out from patch 1.
> - Rewrote commit message from scratch
>
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Douglas Anderson <dianders@...omium.org>
Tested-by: Douglas Anderson <dianders@...omium.org>

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