linux-kernel - Re: [PATCH v4 3/3] usb: xhci: plat: Facilitate using autosuspend for xhci plat devices

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Message-ID: <CAL411-qmWLJ9vYTc+NHFYymsJ27ryge88nTc71NAnzDa7TrExg@mail.gmail.com>
Date: Wed, 13 Aug 2025 14:16:21 +0800
From: Peter Chen <hzpeterchen@...il.com>
To: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
Cc: Thinh Nguyen <Thinh.Nguyen@...opsys.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Mathias Nyman <mathias.nyman@...el.com>, 
	Bjorn Andersson <bjorn.andersson@....qualcomm.com>, 
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>, linux-arm-msm@...r.kernel.org, 
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] usb: xhci: plat: Facilitate using autosuspend for
 xhci plat devices

On Tue, Aug 12, 2025 at 1:58 PM Krishna Kurapati
<krishna.kurapati@....qualcomm.com> wrote:
>
> Allow autosuspend to be used by xhci plat device. For Qualcomm SoCs,
> when in host mode, it is intended that the controller goes to suspend
> state to save power and wait for interrupts from connected peripheral
> to wake it up. This is particularly used in cases where a HID or Audio
> device is connected. In such scenarios, the usb controller can enter
> auto suspend and resume action after getting interrupts from the
> connected device.
>
> Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
> ---
>  drivers/usb/host/xhci-plat.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 5eb51797de32..dd57ffedcaa2 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -171,6 +171,7 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
>                 return ret;
>
>         pm_runtime_set_active(&pdev->dev);
> +       pm_runtime_use_autosuspend(&pdev->dev);
>         pm_runtime_enable(&pdev->dev);
>         pm_runtime_get_noresume(&pdev->dev);
>

There is an xhci quirk XHCI_DEFAULT_PM_RUNTIME_ALLOW for it, try to use it.

Peter