linux-kernel - Re: [PATCH v3] usb: host: xhci-plat: Set XHCI_SKIP_PHY

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Date:   Tue, 14 Dec 2021 10:17:48 +0530
From:   Sandeep Maheswaram <quic_c_sanm@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Kaehlcke <mka@...omium.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>
Subject: Re: [PATCH v3] usb: host: xhci-plat: Set XHCI_SKIP_PHY_INIT quirk for
 DWC3 controller


On 12/2/2021 8:47 AM, Stephen Boyd wrote:
> Quoting Sandeep Maheswaram (2021-11-30 22:15:38)
>> Set XHCI_SKIP_PHY_INIT quirk to avoid phy initialization twice.
>> Runtime suspend of phy drivers was failing from DWC3 driver as
>> runtime usage value is 2 because the phy is initialized from
>> DWC3 core and HCD core.
>> DWC3 manages phy in their core drivers.
> This looks wrapped weirdly.
>
>> Set this quirk to avoid phy initialization in HCD core.
>>
>> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> Any Fixes tag?
Not sure about the commit id to be used here.
>
>> ---
>>   drivers/usb/host/xhci-plat.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
>> index c1edcc9..9bbd939 100644
>> --- a/drivers/usb/host/xhci-plat.c
>> +++ b/drivers/usb/host/xhci-plat.c
>> @@ -327,6 +327,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
>>                                           &xhci->imod_interval);
>>          }
>>
>> +       if (of_device_is_compatible(pdev->dev.parent->of_node, "snps,dwc3"))
> Are we sure that pdev->dev.parent isn't NULL here?

+    if (of_device_is_compatible(to_of_node(sysdev->fwnode), "snps,dwc3"))

Will this be ok ?

>
>> +               xhci->quirks |= XHCI_SKIP_PHY_INIT;
>> +
>>          hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
>>          if (IS_ERR(hcd->usb_phy)) {