linux-kernel - Re: [PATCH v2 1/2] arm64: dts: qcom: sc7180: Disable SuperSpeed instances in park mode

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Date: Tue, 4 Jun 2024 13:34:44 +0530
From: Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: <cros-qcom-dts-watchers@...omium.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Rob Herring <robh@...nel.org>, Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        "Greg
 Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Matthias Kaehlcke
	<mka@...omium.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <quic_ppratap@...cinc.com>, <quic_jackp@...cinc.com>,
        Doug Anderson
	<dianders@...gle.com>, <stable@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] arm64: dts: qcom: sc7180: Disable SuperSpeed
 instances in park mode



On 6/4/2024 1:16 PM, Dmitry Baryshkov wrote:
> On Tue, Jun 04, 2024 at 11:36:58AM +0530, Krishna Kurapati wrote:
>> On SC7180, in host mode, it is observed that stressing out controller
>> results in HC died error:
>>
>>   xhci-hcd.12.auto: xHCI host not responding to stop endpoint command
>>   xhci-hcd.12.auto: xHCI host controller not responding, assume dead
>>   xhci-hcd.12.auto: HC died; cleaning up
>>
>> And at this instant only restarting the host mode fixes it. Disable
>> SuperSpeed instances in park mode for SC7180 to mitigate this issue.
> 
> Let me please repeat the question from v1:
> 
> Just out of curiosity, what is the park mode?
> 

Sorry, Missed the mail in v1.

Databook doesn't give much info on this bit (SS case, commit 
7ba6b09fda5e0) but it does in HS case (commit d21a797a3eeb2).

 From the mail we received from Synopsys, they described it as follows:

"Park mode feature allows better throughput on the USB in cases where a 
single EP is active. It increases the degree of pipelining within the 
controller as long as a single EP is active."

Even in the current debug for this test case, Synopsys suggested us to 
set this bit to avoid the controller being dead and we are waiting for 
further answers from them.

I can update thread with more info once we get some data from Synopsys.

Regards,
Krishna,

>>
>> Reported-by: Doug Anderson <dianders@...gle.com>
>> Cc: <stable@...r.kernel.org>
>> Fixes: 0b766e7fe5a2 ("arm64: dts: qcom: sc7180: Add USB related nodes")
>> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
>> ---
>> Removed RB/TB tag from Doug as commit text was updated.
>>
>>   arch/arm64/boot/dts/qcom/sc7180.dtsi | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
>> index 2b481e20ae38..cc93b5675d5d 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
>> @@ -3063,6 +3063,7 @@ usb_1_dwc3: usb@...0000 {
>>   				iommus = <&apps_smmu 0x540 0>;
>>   				snps,dis_u2_susphy_quirk;
>>   				snps,dis_enblslpm_quirk;
>> +				snps,parkmode-disable-ss-quirk;
>>   				phys = <&usb_1_hsphy>, <&usb_1_qmpphy QMP_USB43DP_USB3_PHY>;
>>   				phy-names = "usb2-phy", "usb3-phy";
>>   				maximum-speed = "super-speed";
>> -- 
>> 2.34.1
>>
>