linux-kernel - Re: [PATCH] usb: dwc3: Fix the USB 3.0 hub detection bug after warm boot

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Message-ID: <CAMz4kuLeeiCaoG2d9mB1rZa0sUKSBo9Pgzm+D+1TZy+v5K1f0g@mail.gmail.com>
Date:   Wed, 12 Jul 2017 14:08:04 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     gustavo panizzo <gfa@...bi.com.ar>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        Brian Kim <brian.kim@...dkernel.com>
Subject: Re: [PATCH] usb: dwc3: Fix the USB 3.0 hub detection bug after warm boot

Hi,

On 12 July 2017 at 11:52, gustavo panizzo <gfa@...bi.com.ar> wrote:
> The dwc3 could not release resources when the module is built-in
> because this module does not have shutdown method. This causes the USB
> 3.0 hub is not able to detect after warm boot.
>
> Original patch by Brian Kim, updated and submitted upstream by gustavo
> panizzo.
>
> Also see https://bugs.debian.org/843448
>
> Signed-off-by: Brian Kim <brian.kim@...dkernel.com>
> Signed-off-by: gustavo panizzo <gfa@...bi.com.ar>
> ---
>  drivers/usb/dwc3/core.c | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 326b302fc440..f92dfe213d89 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1259,6 +1259,38 @@ static int dwc3_probe(struct platform_device *pdev)
>         return ret;
>  }
>
> +static void dwc3_shutdown(struct platform_device *pdev)
> +{
> +       struct dwc3     *dwc = platform_get_drvdata(pdev);
> +       struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> +       pm_runtime_get_sync(&pdev->dev);
> +       /*
> +        * restore res->start back to its original value so that, in case the
> +        * probe is deferred, we don't end up getting error in request the
> +        * memory region the next time probe is called.
> +        */
> +       res->start -= DWC3_GLOBALS_REGS_START;
> +
> +       dwc3_debugfs_exit(dwc);
> +       dwc3_core_exit_mode(dwc);
> +       dwc3_event_buffers_cleanup(dwc);
> +       dwc3_free_event_buffers(dwc);
> +
> +       usb_phy_set_suspend(dwc->usb2_phy, 1);
> +       usb_phy_set_suspend(dwc->usb3_phy, 1);
> +
> +       phy_power_off(dwc->usb2_generic_phy);
> +       phy_power_off(dwc->usb3_generic_phy);

We've done these in dwc3_core_exit().

> +
> +       dwc3_core_exit(dwc);
> +       dwc3_ulpi_exit(dwc);
> +
> +       pm_runtime_put_sync(&pdev->dev);
> +       pm_runtime_allow(&pdev->dev);
> +       pm_runtime_disable(&pdev->dev);
> +}
> +
>  static int dwc3_remove(struct platform_device *pdev)
>  {
>         struct dwc3     *dwc = platform_get_drvdata(pdev);
> @@ -1488,6 +1520,7 @@ MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match);
>  static struct platform_driver dwc3_driver = {
>         .probe          = dwc3_probe,
>         .remove         = dwc3_remove,
> +       .shutdown       = dwc3_shutdown,
>         .driver         = {
>                 .name   = "dwc3",
>                 .of_match_table = of_match_ptr(of_dwc3_match),
> --
> 2.11.0
>
> --
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-- 
Baolin.wang
Best Regards