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

[Peter Chen]

On Sun, Apr 12, 2015 at 12:06:10PM +0200, Stefan Wahren wrote:
> 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?

Some controllers have dedicated ID pin which doesn't need to configure pinctrl
registers. If the user would like to use role switch function and the
ID pin can be configured by pinctrl subsystem, it needs to set pinctrl
through dts.

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

Best Regards,
Peter Chen