Bug: Toggling green led on Olinuxino Maxi, also toggles USB

[Stefan Wahren]

Hi,

toggling the green LED (GPIO 65) on Olinuxino Maxi unexpectedly also toggles the
USB Host support.

Here is the console output:

# Switching the led off (USB drive connected)
echo 255 > /sys/class/leds/green/brightness
[  318.650000] ci_hdrc ci_hdrc.0: timeout waiting for 00000800 in 11
[  318.650000] ci_hdrc ci_hdrc.0: EHCI Host Controller
[  318.670000] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
[  318.710000] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
[  318.750000] hub 1-0:1.0: USB hub found
[  318.780000] hub 1-0:1.0: 1 port detected
[  319.140000] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[  319.310000] hub 1-1:1.0: USB hub found
[  319.340000] hub 1-1:1.0: 3 ports detected
[  319.640000] usb 1-1.1: new high-speed USB device number 3 using ci_hdrc
[  319.880000] usb 1-1.2: new high-speed USB device number 4 using ci_hdrc
[  320.030000] usb-storage 1-1.2:1.0: USB Mass Storage device detected
[  320.040000] scsi host0: usb-storage 1-1.2:1.0
[  321.090000] scsi 0:0:0:0: Direct-Access     LG       USB Drive        1100
PQ: 0 ANSI: 0 CCS

# Switching the led on (USB drive connected)
echo "0" > /sys/class/leds/green/brightness
[ 1068.890000] ci_hdrc ci_hdrc.0: remove, state 1
[ 1068.890000] usb usb1: USB disconnect, device number 1
[ 1068.920000] usb 1-1: USB disconnect, device number 2
[ 1068.920000] usb 1-1.1: USB disconnect, device number 3
[ 1069.070000] usb 1-1.2: USB disconnect, device number 4
[ 1069.450000] ci_hdrc ci_hdrc.0: USB bus 1 deregistered
[ 1074.460000] ci_hdrc ci_hdrc.0: timeout waiting for 00000800 in 11

Kernel: 4.0.0-rc4-next-20150320
Bootloader: U-Boot 2014-10

Harald discovered this problem before me on Olinuxino Mini [1].

I think the problem has something to with USB OTG, because GPIO 65 is on the
same pin for USB_OTG_ID.
My idea was to set "dr_mode" in olinuxino dts explicit to "host" and it works,
but i'm not sure that is the right fix.

Shouldn't chipidea driver complain about missing pinctrl or something else?

Stefan

[1] - https://www.olimex.com/forum/index.php?topic=4271.0