Exynos5422 EHCI (USB 2.0) - Odroid XU4 - port 1 resume error -110

From	Krzysztof Kozlowski <krzk@kernel.org>
Newsgroups	linux.kernel
Subject	Exynos5422 EHCI (USB 2.0) - Odroid XU4 - port 1 resume error -110
Date	2017-01-29 14:40 +0100
Message-ID	<t4XS1-7Bh-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,

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.

Tested:
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
case helped ENABLING bits DWC3_GUSB2PHYCFG_SUSPHY and
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,
Krzysztof

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Exynos5422 EHCI (USB 2.0) - Odroid XU4 - port 1 resume error -110 Krzysztof Kozlowski <krzk@kernel.org> - 2017-01-29 14:40 +0100
  Re: Exynos5422 EHCI (USB 2.0) - Odroid XU4 - port 1 resume error -110 Anand Moon <linux.amoon@gmail.com> - 2017-01-30 07:40 +0100

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