linux-kernel - Re: [PATCH v2 1/2] arm64: dts: qcom: talos: Flatten usb controller nodes

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Message-ID: <8892020f-b674-49fd-8715-aaa364ee9e54@oss.qualcomm.com>
Date: Fri, 30 Jan 2026 20:19:09 +0530
From: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, 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>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: Re: [PATCH v2 1/2] arm64: dts: qcom: talos: Flatten usb controller
 nodes



On 1/29/2026 4:58 PM, Konrad Dybcio wrote:
> On 1/28/26 5:09 PM, Krishna Kurapati wrote:
>>
>>
>> On 1/28/2026 4:01 PM, Konrad Dybcio wrote:
>>> On 1/28/26 7:27 AM, Krishna Kurapati wrote:
>>>> Flatten usb controller nodes and update to using latest bindings
>>>> and flattened driver approach.
>>>>
>>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>>>> Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
>>>> ---
>>>
>>> Have you checked whether this brings about the same crash-on-suspend
>>> issue as it does on Hamoa?
>>>
>>> https://lore.kernel.org/linux-arm-msm/71c15a78-7a50-4913-b677-e5308fcabfad@packett.cool/
>>>
>>
>> Hi Konrad,
>>
>>   Yes, I did check system suspend use case after flattening and there is no crash seen.
>>
>>   The only issue I observed (both before and after flattening) is that waking up from bus suspend, there is an enumeration failure on second port in host mode, and an xHCI CMD_RUN timeout occurs. The issue is gone if we keep controller GDSC flags as RET_ON (not the right solution though). But this issue has nothing to do with flattening. I will sync up with clocks team and try to fix that host mode issue.
> 
> diff --git a/arch/arm64/boot/dts/qcom/talos.dtsi b/arch/arm64/boot/dts/qcom/talos.dtsi
> index 75716b4a58d6..7e7f4eae8a98 100644
> --- a/arch/arm64/boot/dts/qcom/talos.dtsi
> +++ b/arch/arm64/boot/dts/qcom/talos.dtsi
> @@ -4559,7 +4559,7 @@ usb_2: usb@...8800 {
>                                   <&gcc GCC_AGGRE_USB2_SEC_AXI_CLK>,
>                                   <&gcc GCC_USB20_SEC_SLEEP_CLK>,
>                                   <&gcc GCC_USB20_SEC_MOCK_UTMI_CLK>,
> -                                <&gcc GCC_USB2_PRIM_CLKREF_CLK>;
> +                                <&gcc GCC_USB3_SEC_CLKREF_CLK>;
> 
> 

I tried this out but it didn't work.

Regards,
Krishna,