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

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Date:   Wed, 06 Feb 2019 08:49:13 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Jochen Sprickerhof <git@...hen.sprickerhof.de>,
        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,

Jochen Sprickerhof <git@...hen.sprickerhof.de> writes:
> 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.
>
> 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);

I can't see why this is necessary. What's really going on? Why is this
branch helping?

-- 
balbi

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