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SubjectRe: [PATCH v6 8/8] arm64: dts: qcom: sdm845: Add Q6V5 MSS node
Hey Doug,

On 2019-02-28 02:33, Doug Anderson wrote:
> Hi,
>
> On Tue, Feb 26, 2019 at 3:54 PM Doug Anderson <dianders@chromium.org>
> wrote:
>>
>> Hi,
>>
>> On Tue, Feb 5, 2019 at 9:13 PM Bjorn Andersson
>> <bjorn.andersson@linaro.org> wrote:
>> >
>> > From: Sibi Sankar <sibis@codeaurora.org>
>> >
>> > This patch adds Q6V5 MSS remoteproc node for SDM845 SoCs.
>> >
>> > Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
>> > Reviewed-by: Douglas Anderson <dianders@chromium.org>
>> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.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@4080000 {
>> > + 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

AFAIK modem does not have a smmu in front of it.

We have reserved memory nodes for mba and mpss,
however for mdt authentication we just rely on
dma_alloc_attrs with DMA_ATTR_FORCE_CONTIGUOUS
for allocation which seems to fail here.

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

Yeah I'll enable arm-smmu.disable_bypass and
have a go at booting modem.

>
>
> -Doug

--
-- Sibi Sankar --
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project.

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