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* Exynos5422 EHCI (USB 2.0) - Odroid XU4 - port 1 resume error -110
@ 2017-01-29 13:35 Krzysztof Kozlowski
  2017-01-30  6:38 ` Anand Moon
  0 siblings, 1 reply; 2+ messages in thread
From: Krzysztof Kozlowski @ 2017-01-29 13:35 UTC (permalink / raw)
  To: Kamil Debski, Sylwester Nawrocki, Kishon Vijay Abraham I,
	Felipe Balbi, Kukjin Kim, Javier Martinez Canillas, linux-usb,
	linux-samsung-soc, linux-kernel, Felipe Balbi, Richard Genoud,
	Anand Moon, Marek Szyprowski, Markus Reichl

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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2017-01-29 13:35 Exynos5422 EHCI (USB 2.0) - Odroid XU4 - port 1 resume error -110 Krzysztof Kozlowski
2017-01-30  6:38 ` Anand Moon

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