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

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Message-ID: <20250610111019.osnrknvff7tlvrfz@umbar.lan>
Date: Tue, 10 Jun 2025 14:10:19 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: 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 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?

> 
> 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
> 

-- 
With best wishes
Dmitry