linux-kernel - Re: [PATCH] usb: dwc3: Enable GBit Ethernet on Odroid XU4

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Date:   Wed, 6 Feb 2019 10:41:47 +0200
From:   Roger Quadros <rogerq@...com>
To:     Jochen Sprickerhof <git@...hen.sprickerhof.de>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Vivek Gautam <gautam.vivek@...sung.com>,
        Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH] usb: dwc3: Enable GBit Ethernet on Odroid XU4

Hi,

On 21/01/19 16:02, Jochen Sprickerhof wrote:
> Note that it only works with USB_XHCI_PLATFORM=y. Also it needs a hard
> reset when coming from an unpatched kernel.
> 
> This was included in the original patch in
> https://patchwork.kernel.org/patch/9992809/ but got dropped when
> accepted in d8c80bb3b55b phy: exynos5-usbdrd: Calibrate LOS levels for
> exynos5420/5800.
> 
> Old behaviour:
> 
> $ lsusb -t
> /:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
> /:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
>    |__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=r8152, 480M
> 
> New behaviour:
> 
> $ lsusb -t
> /:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
>    |__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=r8152, 5000M
> 
> Tested on Debian unstable using u-boot-exynos (2018.11+dfsg-2) and Linux
> 4.19.14.
> 
> Signed-off-by: Jochen Sprickerhof <git@...hen.sprickerhof.de>
> ---
> 
> Hi,
> 
> I'm not sure why this it only works with the driver compiled into the
> kernel nor why it needs a hard reset or why it was the line was dropped
> when the patch was accepted. Would be great to get some feedback of the
> authors.

When XHCI driver is compiled into the kernel are the relevant PHY drivers
compiled in as well?

cheers,
-roger

> 
> Cheers Jochen
> 
> drivers/usb/dwc3/core.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index a1b126f90261..0008bccc30aa 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1169,7 +1169,8 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
>                 dev_err(dev, "failed to initialize host\n");
>             return ret;
>         }
> -        phy_calibrate(dwc->usb2_generic_phy);
> +        if (dwc->usb2_generic_phy)
> +            phy_calibrate(dwc->usb2_generic_phy);
>         break;
>     case USB_DR_MODE_OTG:
>         INIT_WORK(&dwc->drd_work, __dwc3_set_mode);

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