Huawei me906s-158

[Bjørn Mork]

Andreas Fett <andreas.fett at secunet.com> writes:
> On 11/03/16 12:16, Bjørn Mork wrote:
>> I went back to your lsusb output to see if I could see anything strange
>> wrt the LPM settings, but the whole dump was strange..  Did you use a
>> very old lsusb version?  The device says
>> 
>>  bcdUSB               2.10
>> 
>> so it must have a BOS descriptor.  And AFAICS, BOS descriptor dump for
>> USB 2.1 was added in usbutils v006.  The MBIM functional descriptors
>> weren't decoded either, but that wasn't added before v007.
> Sorry about that, but yes the lsusb version is ancient. I attached a new
> log using v007 (can't use v008 because of libudev).
>
>> Do you see any *lpm* attributes in the USB device power sysfs group?
>> What's the output of
>> 
>>  grep . /sys/bus/usb/devices/1-3/power/*
> /sys/bus/usb/devices/1-3/power/active_duration:189447
> /sys/bus/usb/devices/1-3/power/async:enabled
> /sys/bus/usb/devices/1-3/power/autosuspend:2
> /sys/bus/usb/devices/1-3/power/autosuspend_delay_ms:2000
> /sys/bus/usb/devices/1-3/power/connected_duration:189447
> /sys/bus/usb/devices/1-3/power/control:on
> /sys/bus/usb/devices/1-3/power/level:on
> /sys/bus/usb/devices/1-3/power/persist:1
> /sys/bus/usb/devices/1-3/power/runtime_active_kids:0
> /sys/bus/usb/devices/1-3/power/runtime_active_time:189130
> /sys/bus/usb/devices/1-3/power/runtime_enabled:forbidden
> /sys/bus/usb/devices/1-3/power/runtime_status:active
> /sys/bus/usb/devices/1-3/power/runtime_suspended_time:0
> /sys/bus/usb/devices/1-3/power/runtime_usage:1
> /sys/bus/usb/devices/1-3/power/usb2_hardware_lpm:disabled
> /sys/bus/usb/devices/1-3/power/usb2_lpm_besl:4
> /sys/bus/usb/devices/1-3/power/usb2_lpm_l1_timeout:512
> /sys/bus/usb/devices/1-3/power/wakeup:disabled

So this is with both autosuspend and usb2_hardware_lpm disabled.  Is
that the setting that works?  How about enabling just one of them?

Hoping you can find some pattern for the work/non-work case.  Don't know
what elso to do right now.

> Bus 001 Device 002: ID 12d1:15c1 Huawei Technologies Co., Ltd. 
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.10
..
> Binary Object Store Descriptor:
>   bLength                 5
>   bDescriptorType        15
>   wTotalLength           22
>   bNumDeviceCaps          2
>   USB 2.0 Extension Device Capability:
>     bLength                 7
>     bDescriptorType        16
>     bDevCapabilityType      2
>     bmAttributes   0x00000002
>       Link Power Management (LPM) Supported
>   SuperSpeed USB Device Capability:
>     bLength                10
>     bDescriptorType        16
>     bDevCapabilityType      3
>     bmAttributes         0x00
>     wSpeedsSupported   0x000f
>       Device can operate at Low Speed (1Mbps)
>       Device can operate at Full Speed (12Mbps)
>       Device can operate at High Speed (480Mbps)
>       Device can operate at SuperSpeed (5Gbps)
>     bFunctionalitySupport   1
>       Lowest fully-functional device speed is Full Speed (12Mbps)
>     bU1DevExitLat           1 micro seconds
>     bU2DevExitLat         500 micro seconds
> Device Status:     0x0001
>   Self Powered


Thanks.  Looks good to me, but I don't understand much of this.  Like:
The device support SS and is internally connected to an xhci controller
via an m.2 slot, but still runs in HS mode?  Didn't they connect the SS
lanes or what?

I am way over my head here...  I think I'll go prepare the "NDP to end"
quirk for cdc_mbim.  That I know how to do.


Bjørn