linux-kernel - Re: [PATCH 2/4] arm64: dts: qcom: sc7180: Add iommus property to ETR

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Message-ID: <afd1c140aa9893478cd78620de35f853@codeaurora.org>
Date:   Tue, 28 Jul 2020 12:50:05 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Stephen Boyd <swboyd@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        mike.leach@...aro.org, Jonathan Marek <jonathan@...ek.ca>
Subject: Re: [PATCH 2/4] arm64: dts: qcom: sc7180: Add iommus property to ETR

On 2020-07-28 11:58, Bjorn Andersson wrote:
> On Mon 27 Jul 21:40 PDT 2020, Sai Prakash Ranjan wrote:
> 
>> On 2020-07-28 02:28, Bjorn Andersson wrote:
>> > On Tue 23 Jun 23:56 PDT 2020, Sai Prakash Ranjan wrote:
>> >
>> > > Hi Bjorn,
>> > >
>> > > On 2020-06-21 13:39, Sai Prakash Ranjan wrote:
>> > > > Hi Bjorn,
>> > > >
>> > > > On 2020-06-21 12:52, Bjorn Andersson wrote:
>> > > > > On Tue 09 Jun 06:30 PDT 2020, Sai Prakash Ranjan wrote:
>> > > > >
>> > > > > > Define iommus property for Coresight ETR component in
>> > > > > > SC7180 SoC with the SID and mask to enable SMMU
>> > > > > > translation for this master.
>> > > > > >
>> > > > >
>> > > > > We don't have &apps_smmu in linux-next, as we've yet to figure out how
>> > > > > to disable the boot splash or support the stream mapping handover.
>> > > > >
>> > > > > So I'm not able to apply this.
>> > > > >
>> > > >
>> > > > This is for SC7180 which has apps_smmu not SM8150.
>> > > >
>> > >
>> > > Please let me know if this needs further explanation.
>> > >
>> >
>> > I must have commented on the wrong patch, sorry about that. The SM8150
>> > patch in this series does not compile due to the lack of &apps_smmu.
>> >
>> > I've picked the other 3 patches.
>> >
>> 
>> Thanks Bjorn, I can resend SM8150 coresight change when SMMU support 
>> lands
>> for it
>> since coresight ETR won't work without it on android bootloaders.
>> 
>> As for the other 3 patches, Patch 1 and Patch 2 will apply cleanly to 
>> the
>> right coresight
>> nodes but due to the missing unique context in Patch 3, it could be 
>> applied
>> to some other node.
>> We had to upload this change 3 times in chromium tree to get it 
>> applied to
>> the right replicator node :)
>> and this property in Patch 3 is important to fix a hard lockup. I'm 
>> not sure
>> why this patch is missing
>> the proper context :/
>> 
>> I couldn't find the changes yet in qcom/for-next or other branches to 
>> see if
>> it is
>> applied to right replicator node. In case you haven't applied it yet, 
>> Patch
>> 3 change
>> should be applied to "replicator@...6000" node.
>> 
> 
> Thanks for pointing that out, I've fixed up the incorrectly applied
> change. (Still not published the branch)
> 
> 
> For the future I believe you can pass -U <n> to git format-patch to get
> <n> number of lines of context. Making that bigger than the default 3
> should help for the coresight patches.
> 

Thanks Bjorn, will use this option going forward.

Thanks,
Sai

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