linux-kernel - Re: [PATCH v4 3/9] usb: dwc3: Increase timeout for CmdAct cleared by device controller

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Message-ID: <87imgx35pg.fsf@kernel.org>
Date:   Fri, 15 May 2020 12:31:07 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Jun Li <lijun.kernel@...il.com>
Cc:     John Stultz <john.stultz@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Yu Chen <chenyu56@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        ShuFan Lee <shufan_lee@...htek.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Jack Pham <jackp@...eaurora.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        "open list\:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, peter.chen@....com,
        Li Jun <jun.li@....com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Subject: Re: [PATCH v4 3/9] usb: dwc3: Increase timeout for CmdAct cleared by device controller


Hi,

Jun Li <lijun.kernel@...il.com> writes:
>> @@ -397,12 +407,18 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
>>                         dwc3_gadget_ep_get_transfer_index(dep);
>>         }
>>
>> -       if (saved_config) {
>> +       if (saved_hs_config) {
>>                 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
>> -               reg |= saved_config;
>> +               reg |= saved_hs_config;
>>                 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
>>         }
>>
>> +       if (saved_ss_config) {
>> +               reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
>> +               reg |= saved_ss_config;
>> +               dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
>> +       }
>> +
>>         return ret;
>>  }
>
> Unfortunately this way can't work, once the SS PHY enters P3, disable
> suspend_en can't force SS PHY exit P3, unless do this at the very beginning
> to prevent SS PHY entering P3(e.g. add "snps,dis_u3_susphy_quirk" for test).

It sounds like you have a quirky PHY. If that's the case, then you
probably need to use the flag you mentioned above. Please verify with
that.

-- 
balbi

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