linux-kernel - Re: [PATCH 1/3] usb: dwc2: override PHY input signals with usb role switch support

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Date:   Sun, 19 Jul 2020 21:56:27 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Amelie DELAUNAY <amelie.delaunay@...com>
Cc:     Alexandre TORGUE <alexandre.torgue@...com>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Fabrice GASNIER <fabrice.gasnier@...com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "hminas@...opsys.com" <hminas@...opsys.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
Subject: Re: [PATCH 1/3] usb: dwc2: override PHY input signals with usb role
 switch support

Hello Amelie,

sorry for the late reply

On Wed, Jul 8, 2020 at 6:00 PM Amelie DELAUNAY <amelie.delaunay@...com> wrote:
[...]
> Could you please test with:
>
> static int dwc2_drd_role_sw_set(struct device *dev, enum usb_role role)
> {
>         struct dwc2_hsotg *hsotg = dev_get_drvdata(dev);
>         unsigned long flags;
>         int already = 0;
>
>         /* Skip session not in line with dr_mode */
>         if ((role == USB_ROLE_DEVICE && hsotg->dr_mode == USB_DR_MODE_HOST) ||
>             (role == USB_ROLE_HOST && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL))
>                 return -EINVAL;
>
>         /* Skip session if core is in test mode */
>         if (role == USB_ROLE_NONE && hsotg->test_mode) {
>                 dev_dbg(hsotg->dev, "Core is in test mode\n");
>                 return -EBUSY;
>         }
>
>         spin_lock_irqsave(&hsotg->lock, flags);
>
>         if (role == USB_ROLE_HOST) {
>                 already = dwc2_ovr_avalid(hsotg, true);
>         } else if (role == USB_ROLE_DEVICE) {
>                 already = dwc2_ovr_bvalid(hsotg, true);
>                 /* This clear DCTL.SFTDISCON bit */
>                 dwc2_hsotg_core_connect(hsotg);
>         } else {
>                 if (dwc2_is_device_mode(hsotg)) {
>                     if (!dwc2_ovr_bvalid(hsotg, false))
>                         /* This set DCTL.SFTDISCON bit */
>                         dwc2_hsotg_core_disconnect(hsotg);
>                 } else {
>                         dwc2_ovr_avalid(hsotg, false);
>                 }
>         }
>
>         spin_unlock_irqrestore(&hsotg->lock, flags);
>
>         if (!already &&
>             role != USB_ROLE_NONE && hsotg->dr_mode == USB_DR_MODE_OTG)
>                 /* This will raise a Connector ID Status Change Interrupt */
>                 dwc2_force_mode(hsotg, role == USB_ROLE_HOST);
>
>         dev_dbg(hsotg->dev, "%s-session valid\n",
>                 role == USB_ROLE_NONE ? "No" :
>                 role == USB_ROLE_HOST ? "A" : "B");
>
>         return 0;
> }
>
>
> dwc2_force_mode is called outside the spin_lock_irqsave so the kernel
> should not complain. I've tested on my setup and the behavior seems the
> same.
this one is looking good - the previous kernel warnings are now gone!
thank you very much


Best regards,
Martin