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SubjectRe: [PATCH v20 2/5] usb: dwc3: core: Host wake up support from system suspend
Hi Krishna,

with this version I see xHCI errors on my SC7180 based system, like
these:

[ 65.352605] xhci-hcd xhci-hcd.13.auto: xHC error in resume, USBSTS 0x401, Reinit

[ 101.307155] xhci-hcd xhci-hcd.13.auto: WARN: xHC CMD_RUN timeout

After resume a downstream hub isn't enumerated again.

So far I didn't see those with v13, but I aso saw the first error with
v16.

I can do some more digging next week.

On Thu, Jun 02, 2022 at 01:54:34PM +0530, Krishna Kurapati wrote:
> From: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
>
> Check wakeup-source property for dwc3 core node to set the
> wakeup capability. Drop the device_init_wakeup call from
> runtime suspend and resume.
>
> If the dwc3 is wakeup capable, don't power down the USB PHY(s).
> The glue drivers are expected to take care of configuring the
> additional wakeup settings if needed based on the dwc3 wakeup
> capability status. In some SOC designs, powering off the PHY is
> resulting in higher leakage, so this patch save power on such boards.
>
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
> Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
> Reviewed-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
> ---
> drivers/usb/dwc3/core.c | 9 +++------
> 1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index e027c04..b99d3c2 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1787,6 +1787,7 @@ static int dwc3_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, dwc);
> dwc3_cache_hwparams(dwc);
> + device_init_wakeup(&pdev->dev, of_property_read_bool(dev->of_node, "wakeup-source"));
>
> spin_lock_init(&dwc->lock);
> mutex_init(&dwc->mutex);
> @@ -1948,7 +1949,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
> dwc3_core_exit(dwc);
> break;
> case DWC3_GCTL_PRTCAP_HOST:
> - if (!PMSG_IS_AUTO(msg)) {
> + if (!PMSG_IS_AUTO(msg) && !device_can_wakeup(dwc->dev)) {
> dwc3_core_exit(dwc);
> break;
> }
> @@ -2009,7 +2010,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
> spin_unlock_irqrestore(&dwc->lock, flags);
> break;
> case DWC3_GCTL_PRTCAP_HOST:
> - if (!PMSG_IS_AUTO(msg)) {
> + if (!PMSG_IS_AUTO(msg) && !device_can_wakeup(dwc->dev)) {
> ret = dwc3_core_init_for_resume(dwc);
> if (ret)
> return ret;
> @@ -2086,8 +2087,6 @@ static int dwc3_runtime_suspend(struct device *dev)
> if (ret)
> return ret;
>
> - device_init_wakeup(dev, true);
> -
> return 0;
> }
>
> @@ -2096,8 +2095,6 @@ static int dwc3_runtime_resume(struct device *dev)
> struct dwc3 *dwc = dev_get_drvdata(dev);
> int ret;
>
> - device_init_wakeup(dev, false);
> -
> ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME);
> if (ret)
> return ret;
> --
> 2.7.4
>

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