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

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Date:   Fri, 8 Feb 2019 13:36:40 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Roger Quadros <rogerq@...com>,
        Jochen Sprickerhof <jochen@...ickerhof.de>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH] usb: dwc3: Enable GBit Ethernet on Odroid XU4

Hi Roger,

On 2019-02-06 11:17, Roger Quadros wrote:
> +Marek
>
> As Vivek's and Andrzej's Samsung IDs bounced back.
>
> On 06/02/19 11:38, Jochen Sprickerhof wrote:
>> * Roger Quadros <rogerq@...com> [2019-02-06 10:41]:
>>> Hi,
>>>
>>> On 21/01/19 16:02, Jochen Sprickerhof wrote:
>> [..]
>>>> 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?
>> Only CONFIG_USB_PHY=y (I took the config from the linux-image-4.19.0-1-armmp_4.19.13-1_armhf.deb Debian package as a basis where this is the default).

I confirm that on Odroid XU4 USB 3.0 works only when all related drivers
(dwc3, xhci and exynos5 drd phy) are compiled into the kernel. If they
are compiled as modules, USB 3.0 calibration doesn't work. The mentioned
patch doesn't fix anything.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland