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

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Message-ID: <CAMTwNXBM2m6sazPZVng3V-DDJP2T0aVBgh8C5d4K7Yq_O_A2Jg@mail.gmail.com>
Date: Thu, 28 Aug 2025 17:45:29 +0530
From: Udipto Goswami <udipto.goswami@....qualcomm.com>
To: Krishna Kurapati PSSNV <krishna.kurapati@....qualcomm.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Mathias Nyman <mathias.nyman@...el.com>, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v4 3/3] usb: xhci: plat: Facilitate using autosuspend for
 xhci plat devices

On Mon, Aug 25, 2025 at 11:10 AM Krishna Kurapati PSSNV
<krishna.kurapati@....qualcomm.com> wrote:
>
>
>
> On 8/12/2025 11:25 AM, Krishna Kurapati 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);
> >
>
> Hi Mathias,
>
>   Can you help provide your review on this patch.
>
Hi Krishna,

I think the email added for Mathias isn't correct.
Adding the correct one.

Thanks,
-Udipto