linux-kernel - Re: [PATCH] ARM: dts: Odroid XU4: fix USB3.0 ports

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Message-ID: <4dca1d8e-f955-7791-90c0-4e73a273fe62@gmail.com>
Date:   Fri, 27 Jan 2017 08:29:43 +0100
From:   Richard Genoud <richard.genoud@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Anand Moon <linux.amoon@...il.com>,
        Bartłomiej Żołnierkiewicz 
        <b.zolnierkie@...sung.com>, Felipe Balbi <balbi@...nel.org>,
        Huang Rui <ray.huang@....com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Kukjin Kim <kgene@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: Odroid XU4: fix USB3.0 ports

On 25/01/2017 15:17, Krzysztof Kozlowski wrote:
> On Wed, Jan 25, 2017 at 3:48 PM, Marek Szyprowski
> <m.szyprowski@...sung.com> wrote:
>> Hi Krzysztof,
>>
>> On 2017-01-25 08:55, Krzysztof Kozlowski wrote:
>>>
>>> On Wed, Jan 25, 2017 at 7:51 AM, Anand Moon <linux.amoon@...il.com> wrote:
>>>>
>>>> On 24 January 2017 at 19:18, Richard Genoud <richard.genoud@...il.com>
>>>> wrote:
>>>>>
>>>>> Since commit 2164a476205ccc ("usb: dwc3: set SUSPHY bit for all cores"),
>>>>> the USB ports on odroid-XU4 don't work anymore.
>>>>>
>>>>> Inserting an usb key (USB2.0) on the USB3.0 port result in:
>>>>> [ 64.488264] xhci-hcd xhci-hcd.2.auto: Port resume took longer than
>>>>> 20000 msec, port status = 0xc400fe3
>>>>> [   74.568156] xhci-hcd xhci-hcd.2.auto: xHCI host not responding to
>>>>> stop endpoint command.
>>>>> [   74.574806] xhci-hcd xhci-hcd.2.auto: Assuming host is dying, halting
>>>>> host.
>>>>> [   74.601970] xhci-hcd xhci-hcd.2.auto: HC died; cleaning up
>>>>> [   74.606276] usb 3-1: USB disconnect, device number 2
>>>>> [   74.613565] usb 4-1: USB disconnect, device number 2
>>>>> [   74.621208] usb usb3-port1: couldn't allocate usb_device
>>>>> NB: it's not related to USB2.0 devices, I get the same result with an
>>>>> USB3.0 device (SATA to USB3 for instance).
>>>>> NB2: it doesn't happen on an odriod-XU3 board, that doesn't have the
>>>>> realtek RTL8153 chip.
>>>>>
>>>>> If the lines:
>>>>>          if (dwc->revision > DWC3_REVISION_194A)
>>>>>                  reg |= DWC3_GUSB3PIPECTL_SUSPHY;
>>>>> are commented out, the USB3.0 start working.
>>>>>
>>>>> For a full analyse: https://lkml.org/lkml/2017/1/18/678
>>>>>
>>>>> Felipe suggested that suspend should be disabled temporarily while
>>>>> what's wrong with DCW3 is figured out.
>>>>>
>>>>> Tested on Odroid XU4
>>>>>
>>>>> Suggested-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
>>>>> Tested-by: Richard Genoud <richard.genoud@...il.com>
>>>>> Signed-off-by: Richard Genoud <richard.genoud@...il.com>
>>>>> Cc: stable@...r.kernel.org # 4.4+
>>>>> Fixes: 2164a476205ccc ("usb: dwc3: set SUSPHY bit for all cores")
>>>>> ---
>>>>>   arch/arm/boot/dts/exynos5422-odroidxu4.dts | 9 +++++++++
>>>>>   1 file changed, 9 insertions(+)
>>>>>
>>>>> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu4.dts
>>>>> b/arch/arm/boot/dts/exynos5422-odroidxu4.dts
>>>>> index 2faf88627a48..f62dbd9b5ad3 100644
>>>>> --- a/arch/arm/boot/dts/exynos5422-odroidxu4.dts
>>>>> +++ b/arch/arm/boot/dts/exynos5422-odroidxu4.dts
>>>>> @@ -43,6 +43,15 @@
>>>>>          status = "okay";
>>>>>   };
>>>>>
>>>>> +&usbdrd_dwc3_0 {
>>>>> +       /*
>>>>> +        * without that, usb devices are not recognized when
>>>>> +        * they are plugged.
>>>>> +        * cf: https://lkml.org/lkml/2017/1/18/678
>>>>> +        */
>>>>> +       snps,dis_u3_susphy_quirk;
>>>>> +};
>>>>> +
>>>>>   &usbdrd_dwc3_1 {
>>>>>          dr_mode = "host";
>>>>>   };
>>>>> --
>>>>
>>>> Thanks for this patch.
>>>> But could you consider moving this changes as below.
>>>>
>>>> https://lkml.org/lkml/2015/3/18/400
>>>
>>> The patch above (and other DTS patches from the set) was not even sent
>>> to linux-samsung-soc nor to me... It is sad how easily one's work can
>>> disappear. Also, it is really worthless to solve the same problem
>>> twice.
>>
>>
>> Well, they were sent about 2 years ago... and you were also working on this
>> topic. ;)
> 
> Nope, I have never worked on this. That time I was in Korea so my
> tasks were completely different. Later when I got back, I took for a
> second U3 OTG which was not involving this thing.
> 
>>> Cc Marek and Bartlomiej,
>>> Guys, do you want to continue with Robert's patch (linked above by
>>> Anand)? If yes, please take the ownership (Robert's address is not
>>> valid anymore). If not, I will take Richard's patch after
>>> resubmission.
>>
>>
>> Take Richard's patch because it has a bit more details describing why such
>> quirk
>> is needed.
>>
>> Richard: in Roberts patch there is also a quirk for USB 2.0 mode
>> (snps,dis_u2_susphy_quirk). Could you check if it really needed?
>>
>> Maybe it would make sense to set those quirks for both DWC3 controllers, as
>> this
>> issue with PHY suspend seems to be a Exynos specific thing.
> 
> Okay,
> Richard, please continue with your patch.
Ok, I'll grab a XU3 & XU4 and do some more tests.
But I didn't recall having problems with the XU3 board. I'll try to add
a hub or something.