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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
