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Date:   Sun, 29 Jan 2017 15:35:37 +0200
From:   Krzysztof Kozlowski <>
To:     Kamil Debski <>,
        Sylwester Nawrocki <>,
        Kishon Vijay Abraham I <>,
        Felipe Balbi <>,
        Kukjin Kim <>,
        Javier Martinez Canillas <>,,,, Felipe Balbi <>,
        Richard Genoud <>,
        Anand Moon <>,
        Marek Szyprowski <>,
        Markus Reichl <>
Subject: Exynos5422 EHCI (USB 2.0) - Odroid XU4 - port 1 resume error -110


On Odroid XU4 with an external usb2514 hub (evaluation board from SMSC
or TI) connected to the USB2.0 port of EHCI controller, whenever I
plug some USB device into the usb2514 hub I see errors like:
[   73.969179] exynos-ehci 12110000.usb: port 1 resume error -110
[   74.003259] usb 1-1: USB disconnect, device number 2
[   74.017432] usb usb1-port1: cannot reset (err = -32)
[   74.021141] usb usb1-port1: cannot reset (err = -32)
[   74.026832] usb usb1-port1: cannot reset (err = -32)
[   74.030974] usb usb1-port1: cannot reset (err = -32)
[   74.036677] usb usb1-port1: cannot reset (err = -32)
[   74.041919] usb usb1-port1: Cannot enable. Maybe the USB cable is bad?
[   74.140923] usb usb1-port1: unable to enumerate USB device

Flooding the console. USB device does not work.

1. next-20170125,
2. mainline v4.10-rc5-393-g53cd1ad1a68f,
3. Hardkernel vendor kernel 3.10

It does not look like an issue of usb2514 but rather a combination of
usb2514 + Exynos EHCI because:
1. Happens only when usb2514 hub is directly connected to the USB2.0
port of EHCI controller.
2. If usb2514 is connected through other hub (like to other ports on
the board) - everything works fine.
3. I tested two different usb2514 hubs - one from TI, second from
SMSC. Both behave the same.
4. I had the same issue on DWC3 controller (USB 3.0 port) and in that
DWC3_GUSB3PIPECTL_SUSPHY which is I think equal to disabling the
snps,dis_u3_susphy_quirk quirks.

It seems that issue is strictly related to Exynos5422 USB 2.0 driver
(phy?) and this hub. The drivers involved:
 - drivers/phy/phy-exynos5250-usb2.c
 - drivers/phy/phy-samsung-usb2.c
 - drivers/usb/host/ehci-exynos.c

Any ideas?

Best regards,

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