Hello, all
I've just patched the latest kernel to work with dwc_otg driver, thanks to
Layne Edwards' patches.
Everything works fine except one: I'm getting high CPU loads and
unresponsiveness when a 3g modem is
plugged into a usb 2.0 hub, which, in turn, is plugged into the router.
Bringing up ppp connection and sending AT commands back and forth on the
second virtual ttyUSB causes
hangups and watchdog reboots.
Logging in via ssh is sometimes impossible when 3g is up: dropbear eats up
about 60% CPU and does nothing.
Typing reboot will never reboot the system, unless you take of all usb
devices: it just hangs bringing
down loopback interface.
Setting pti_enable module parameter to 1 helps a little, but it's still
mostly unusable.
However, when I plug the modem directly in the router... Everything works
fine, incl. proper reboots.
Is that likely a bug dwc_otg or just a broken hub ?(works fine on my
desktop, though)
I'll try to get a hub on different chipset tomorrow and post the results.
USB descriptor dumps of the hub follow:
necromant@ilwyn:~$ sudo lsusb -vv -s 2:10
[sudo] password for necromant:
Bus 002 Device 010: ID 1a40:0101 TERMINUS TECHNOLOGY INC. USB-2.0 4-Port
HUB
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x1a40 TERMINUS TECHNOLOGY INC.
idProduct 0x0101 USB-2.0 4-Port HUB
bcdDevice 1.11
iManufacturer 0
iProduct 1 USB 2.0 Hub
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 4
wHubCharacteristic 0x0000
Ganged power switching
Ganged overcurrent protection
TT think time 8 FS bits
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 100 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0503 highspeed power enable connect
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0001
Self Powered
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