linux-kernel - Re: [PATCH] clk: qcom: sm8450: Enable retention for usb controller gdsc

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Message-ID: <c3c3826b-ed90-42b1-998c-7b482b0cb051@linaro.org>
Date: Tue, 10 Jun 2025 14:00:26 +0200
From: neil.armstrong@...aro.org
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 Krishna Kurapati <krishna.kurapati@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: sm8450: Enable retention for usb controller
 gdsc

On 10/06/2025 13:10, Dmitry Baryshkov wrote:
> On Tue, Jun 10, 2025 at 02:52:53PM +0530, Krishna Kurapati wrote:
>> When USB controller enters runtime suspend while operating in host
>> mode, then wakeup because of cable disconnect or a button press of
>> a headset causes the following kind of errors:
>>
>> Error after button press on a connected headset :
>>
>> [  355.309260] usb 1-1: reset full-speed USB device number 2 using xhci-hcd
>> [  355.725844] usb 1-1: device not accepting address 2, error -108
>>
>> Error on removal of headset device from usb port:
>>
>> [  157.563136] arm-smmu 15000000.iommu: Unhandled context fault: fsr=0x402
>> ,iova=0xd65504710, fsynr=0x100011, cbfrsynra=0x0, cb=6
>> [  157.574842] arm-smmu 15000000.iommu: FSR    = 00000402 [Format=2 TF],
>> SID=0x0
>> [  157.582181] arm-smmu 15000000.iommu: FSYNR0 = 00100011 [S1CBNDX=16 WNR
>> PLVL=1]
>> [  157.589610] xhci-hcd xhci-hcd.0.auto: WARNING: Host Controller Error
>> [  157.596197] xhci-hcd xhci-hcd.0.auto: WARNING: Host Controller Error
>>
>> Enabling retention on usb controller GDSC fixes the above issues.
> 
> Could you please clarify, if there are other platforms which need this
> change? Is there a chance of switching all of them in one patch set?

Since sm8250, sc8280xp, x1e80100, sm8650 are all affected
- https://lore.kernel.org/r/20221102091320.66007-1-manivannan.sadhasivam@linaro.org
- https://lore.kernel.org/r/20220929161124.18138-1-johan+linaro@kernel.org
- https://lore.kernel.org/r/20240801-x1e80100-clk-gcc-fix-usb-phy-gdscs-pwrsts-v1-1-8df016768a0f@linaro.org
- https://lore.kernel.org/r/20250305-topic-sm8650-upstream-fix-usb-suspend-v1-1-649036ab0557@linaro.org

I think sm8350 & sm8550 also should be switched, perhaps sm8150 also ?

> 
>>
>> Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
>> ---
>>
>> Note:
>> The above mentioned issues pop up after I enabled runtime suspend after
>> applying [1].
>> [1]: https://lore.kernel.org/all/20250610091357.2983085-1-krishna.kurapati@oss.qualcomm.com/
>>
>>   drivers/clk/qcom/gcc-sm8450.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/qcom/gcc-sm8450.c b/drivers/clk/qcom/gcc-sm8450.c
>> index 65d7d52bce03..f94da4a1c921 100644
>> --- a/drivers/clk/qcom/gcc-sm8450.c
>> +++ b/drivers/clk/qcom/gcc-sm8450.c
>> @@ -3141,7 +3141,7 @@ static struct gdsc usb30_prim_gdsc = {
>>   	.pd = {
>>   		.name = "usb30_prim_gdsc",
>>   	},
>> -	.pwrsts = PWRSTS_OFF_ON,
>> +	.pwrsts = PWRSTS_RET_ON,
>>   };
>>   
>>   static struct clk_regmap *gcc_sm8450_clocks[] = {
>> -- 
>> 2.34.1
>>
>