Hi Peter,
Our Colibri iMX6ULL is using NXP i.MX6 ULL in USB host mode. With
4.15-rc3 and 4.16-rc1 I noticed that when a USB Hub is connected to the
USB OTG controller in host mode, Linux continuously resets the USB
device every two seconds:
[ 0.927567] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI)
Driver
[ 0.934170] ehci-mxc: Freescale On-Chip EHCI Host driver
[ 0.992418] ci_hdrc ci_hdrc.0: EHCI Host Controller
[ 0.997550] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus
number 1
[ 1.026730] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
...
[ 1.608880] hub 1-1:1.0: USB hub found
[ 1.616915] hub 1-1:1.0: 4 ports detected
...
[ 3.458475] usb 1-1: reset high-speed USB device number 2 using
ci_hdrc
...
[ 5.456678] usb 1-1: reset high-speed USB device number 2 using
ci_hdrc
[ 7.456684] usb 1-1: reset high-speed USB device number 2 using
ci_hdrc
This happens when using a USB Hub on our Carrier Board or an external
USB Hub.
# lsusb --tree
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ci_hdrc/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
It does not happen with the downstream 4.9.11 based kernel.
Any idea?
--
Stefan
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