linux-kernel - Re: [PATCH v6 8/8] arm64: dts: qcom: sdm845: Add Q6V5 MSS node

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Date:   Wed, 27 Feb 2019 13:03:38 -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>,
        Arun Kumar Neelakantam <aneela@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v6 8/8] arm64: dts: qcom: sdm845: Add Q6V5 MSS node

Hi,

On Tue, Feb 26, 2019 at 3:54 PM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Tue, Feb 5, 2019 at 9:13 PM Bjorn Andersson
> <bjorn.andersson@...aro.org> wrote:
> >
> > From: Sibi Sankar <sibis@...eaurora.org>
> >
> > This patch adds Q6V5 MSS remoteproc node for SDM845 SoCs.
> >
> > Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> > Reviewed-by: Douglas Anderson <dianders@...omium.org>
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >
> > Changes since v5:
> > - None
> >
> >  arch/arm64/boot/dts/qcom/sdm845.dtsi | 58 ++++++++++++++++++++++++++++
> >  1 file changed, 58 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > index 560c16616ee6..5c41f6fe3e1b 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > @@ -1612,6 +1612,64 @@
> >                         };
> >                 };
> >
> > +               mss_pil: remoteproc@...0000 {
> > +                       compatible = "qcom,sdm845-mss-pil";
> > +                       reg = <0 0x04080000 0 0x408>, <0 0x04180000 0 0x48>;
> > +                       reg-names = "qdsp6", "rmb";
>
> I found that when I disabled IOMMU bypass by booting with
> "arm-smmu.disable_bypass=y" that I'd get this failure:
>
> ---
>
> [   13.633776] qcom-q6v5-mss 4080000.remoteproc: MBA booted, loading mpss
> [   13.647694] arm-smmu 15000000.iommu: Unexpected global fault, this
> could be serious
> [   13.660278] arm-smmu 15000000.iommu: GFSR 0x80000002, GFSYNR0
> 0x00000000, GFSYNR1 0x00000781, GFSYNR2 0x00000000
> ...
> [   14.648830] qcom-q6v5-mss 4080000.remoteproc: MPSS header
> authentication timed out
> [   14.657141] qcom-q6v5-mss 4080000.remoteproc: port failed halt
> [   14.664983] remoteproc remoteproc0: can't start rproc
> 4080000.remoteproc: -110
>
> ---
>
> Adding "iommus = <&apps_smmu 0x781 0>;" here fixed my problem.  NOTE
> that I'm no expert on IOMMUs so you should confirm that this is right,
> but if it is then maybe you could include it in the next spin of the
> series?  I got the "0x781" just by looking at the value of the GFSYNR1
> in the above splat.  I wasn't sure what to put for the mask so I put
> 0x0.

Upon more testing the "iommus" line that I came up with avoids the
global fault but doesn't actually work.  I just get:

qcom-q6v5-mss 4080000.remoteproc: failed to allocate mdt buffer

I'm hoping someone from Qualcomm can help out here and say how this
should be solved.  Thanks!


-Doug