linux-kernel - Re: [PATCH v1 0/5] Add snps,dis_u3_susphy

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Message-ID: <db0bbc62-ecf2-4f72-a0c9-462fbaadebc4@oss.qualcomm.com>
Date: Tue, 25 Mar 2025 17:31:28 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Prashanth K <prashanth.k@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: cros-qcom-dts-watchers@...omium.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/5] Add snps,dis_u3_susphy_quirk for some QC targets

On 3/25/25 4:01 PM, Prashanth K wrote:
> 
> 
> On 25-03-25 08:11 pm, Konrad Dybcio wrote:
>> On 3/25/25 1:30 PM, Prashanth K wrote:
>>> During device mode initialization on certain QC targets, before the
>>> runstop bit is set, sometimes it's observed that the GEVNTADR{LO/HI}
>>> register write fails. As a result, GEVTADDR registers are still 0x0.
>>> Upon setting runstop bit, DWC3 controller attempts to write the new
>>> events to address 0x0, causing an SMMU fault and system crash. More
>>> info about the crash at [1].
>>>
>>> This was initially observed on SM8450 and later reported on few
>>> other targets as well. As suggested by Qualcomm HW team, clearing
>>> the GUSB3PIPECTL.SUSPHY bit resolves the issue by preventing register
>>> write failures. Address this by setting the snps,dis_u3_susphy_quirk
>>> to keep the GUSB3PIPECTL.SUSPHY bit cleared. This change was tested
>>> on multiple targets (SM8350, SM8450 QCS615 etc.) for over an year
>>> and hasn't exhibited any side effects.
>>>
>>> [1]: https://lore.kernel.org/all/fa94cbc9-e637-ba9b-8ec8-67c6955eca98@quicinc.com/
>>>
>>> Prashanth K (3):
>>>   arm64: dts: qcom: sm8150: Add snps,dis_u3_susphy_quirk
>>>   arm64: dts: qcom: sm8350: Add snps,dis_u3_susphy_quirk
>>>   arm64: dts: qcom: sm8450: Add snps,dis_u3_susphy_quirk
>>>
>>> Pratham Pratap (2):
>>>   arm64: dts: qcom: qcs615: Add snps,dis_u3_susphy_quirk
>>>   arm64: dts: qcom: qdu1000: Add snps,dis_u3_susphy_quirk
>>
>> Are there more targets affected, from the list of the ones currently
>> supported upstream?
>>
>> Konrad
> 
> My initial plan was to add it for all the QC platforms, but wasn't
> confident enough about it. Because we have seen the issue only on these
> targets and hence tested only on these.

Okay, let's proceed with these and in the meantime please query internally
whether it could be applicable to others too

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad