linux-kernel - Re: PROBLEM: DWC3 USB 3.0 not working on Odroid-XU4 with Exynos 5422

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Message-ID: <CAFp+6iE6aqvOKE4HVCeCokPk_oTHLduS6Gsv+CF4_p4JjkF2TQ@mail.gmail.com>
Date:   Wed, 5 Oct 2016 10:15:45 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Michael Niewöhner <linux@...ewoehner.de>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Pankaj Dubey <pankaj.dubey@...sung.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <k.kozlowski@...sung.com>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Vivek Gautam <gautam.vivek@...sung.com>
Subject: Re: PROBLEM: DWC3 USB 3.0 not working on Odroid-XU4 with Exynos 5422

Hi Anand,


On Tue, Oct 4, 2016 at 8:39 PM, Anand Moon <linux.amoon@...il.com> wrote:
> Hi Vivek,
>

[snip]

>
> What I feel is that their need to be some reset of usb phy so that
> device are assigned to respective bus ports.

The phy resets are what we do in the phy-exynos5-usbdrd driver. In
addition to what we
have currently in this phy driver, we just need the phy calibration
patch [1] for phy configurations.

[1] https://lkml.org/lkml/2015/2/2/259

> odroid@...oid:~$ 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 3, If 0, Class=Vendor Specific Class, Driver=r8152, 480M

This shows the ethernet device gets detected on the high-speed port of one
of the controller.
The lsusb output for kernel v4.7.x posted by Michael show that the
ethernet device got detected on super-speed port of the controller.
So, there seems to be a difference between the two.
Or, is this how it is behaving ?

Is this lsusb output on 4.8 kernel with the patch [1] ?

> /:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
>     |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/2p, 5000M
>         |__ Port 1: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
>         |__ Port 2: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
> /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
>     |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/2p, 480M
> /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=exynos-ohci/3p, 12M
> /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=exynos-ehci/3p, 480M
>     |__ Port 1: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
>
>
> Bus 06.Port should register the Realtek Ethernet r8153 device.
> But I am not able to trace out how it's should happen.

If i understand, below is how the configuration looks like on the board?

                +-----------------------+
        +------>|                       |
        |       |       Bus 6           |-------+
+-----------+   |    (super-speed)      |       |
|           |   +-----------------------+       |
|Controller |                                   | --------> Ethernet device
|    2      |                                   |
|           |   +-----------------------+       |
+-----------+   |                       |       |
        |       |       Bus 5           |-------+
        +------>|   (high-speed)        |
                +-----------------------+


                +-----------------------+
        +------>|                       |
        |       |       Bus 4           |-------+
+-----------+   |    (super-speed)      |       |
|           |   +-----------------------+       |
|Controller |                                   | --------> (On board
hub ?? _OR_ external hub with downstream devices) ???
|    1      |                                   |
|           |   +-----------------------+       |
+-----------+   |                       |       |
        |       |       Bus 3           |-------+
        +------>|   (high-speed)        |
                +-----------------------+


Thanks
Vivek


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