EM7565: Linux USB ports not recognized

IoT Modules MC/EM Series
1

We are using a EM7565 on an embedded Linux System, running on an i.mx8. We have issues with the USB ports recognizing.

Most of the time three USB-interfaces are recognized.

But sometimes only one interface is recognized.

In that case it is not possible to use AT-commands to communicate with the module.

Do you know this error? Can you point me into a direction where to find a solution of the problem

When only one port works /sys/kernel/debug/usb/devices gives:

T:  Bus=02 Lev=02 Prnt=02 Port=02 Cnt=01 Dev#=  3 Spd=5000 MxCh= 0
D:  Ver= 3.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 9 #Cfgs=  1
P:  Vendor=1199 ProdID=9090 Rev= 0.00
S:  Manufacturer=Sierra Wireless, Incorporated
S:  Product=Sierra Wireless EM7565 Qualcomm Snapdragon X16 LTE-A
S:  SerialNumber=UF94119009041546
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=  8mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=qcserial
E:  Ad=81(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms

lsusb -d 1199:9090 -v

Bus 002 Device 003: ID 1199:9090 Sierra Wireless, Inc.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass            0
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         9
  idVendor           0x1199 Sierra Wireless, Inc.
  idProduct          0x9090
  bcdDevice            0.00
  iManufacturer           1 Sierra Wireless, Incorporated
  iProduct                2 Sierra Wireless EM7565 Qualcomm?? Snapdragon??? X16 LTE-A
  iSerial                 3 UF94119009041546
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           44
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower                8mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               3
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               3
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength           22
  bNumDeviceCaps          2
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
    wSpeedsSupported   0x000e
      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          10 micro seconds
    bU2DevExitLat        2047 micro seconds
  USB 2.0 Extension Device Capability:
    bLength                 7
    bDescriptorType        16
    bDevCapabilityType      2
    bmAttributes   0x00000002
      HIRD Link Power Management (LPM) Supported
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
  (Bus Powered)

dmesg | grep -i usb | grep 2-1
[ 4.416469] usb 2-1: new SuperSpeed USB device number 2 using cdns-usb3
[ 4.448984] hub 2-1:1.0: USB hub found
[ 4.806657] usb 2-1.3: new SuperSpeed USB device number 3 using cdns-usb3
[ 4.837705] qcserial 2-1.3:1.0: Qualcomm USB modem converter detected
[ 4.844516] usb 2-1.3: Qualcomm USB modem converter now attached to ttyUSB0

When all ports work it looks like this:
/sys/kernel/debug/usb/devices:

T:  Bus=02 Lev=02 Prnt=02 Port=02 Cnt=01 Dev#=  3 Spd=5000 MxCh= 0
D:  Ver= 3.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 9 #Cfgs=  1
P:  Vendor=1199 ProdID=9091 Rev= 0.06
S:  Manufacturer=Sierra Wireless, Incorporated
S:  Product=Sierra Wireless EM7565 Qualcomm Snapdragon X16 LTE-A
S:  SerialNumber=UF94119009041546
C:* #Ifs= 4 Cfg#= 1 Atr=a0 MxPwr=896mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=qcserial
E:  Ad=81(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=qcserial
E:  Ad=83(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=qcserial
E:  Ad=85(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=84(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=03(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
I:* If#= 8 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E:  Ad=86(I) Atr=03(Int.) MxPS=   8 Ivl=32ms
E:  Ad=8e(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=0f(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms

dmesg | grep -i usb | grep 2-1
[ 4.433822] usb 2-1: new SuperSpeed USB device number 2 using cdns-usb3
[ 4.486647] hub 2-1:1.0: USB hub found
[ 8.727947] usb 2-1.3: new SuperSpeed USB device number 3 using cdns-usb3
[ 8.752775] usb 2-1.3: config 1 has an invalid interface number: 8 but max is 3
[ 8.760175] usb 2-1.3: config 1 has no interface number 1
[ 8.797834] qcserial 2-1.3:1.0: Qualcomm USB modem converter detected
[ 8.804735] usb 2-1.3: Qualcomm USB modem converter now attached to ttyUSB0
[ 8.814004] qcserial 2-1.3:1.2: Qualcomm USB modem converter detected
[ 8.820806] usb 2-1.3: Qualcomm USB modem converter now attached to ttyUSB1
[ 8.828448] qcserial 2-1.3:1.3: Qualcomm USB modem converter detected
[ 8.835127] usb 2-1.3: Qualcomm USB modem converter now attached to ttyUSB2

lsusb -d 1199:9091 -v

Bus 002 Device 003: ID 1199:9091 Sierra Wireless, Inc.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.10
  bDeviceClass            0
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         9
  idVendor           0x1199 Sierra Wireless, Inc.
  idProduct          0x9091
  bcdDevice            0.06
  iManufacturer           1 Sierra Wireless, Incorporated
  iProduct                2 Sierra Wireless EM7565 Qualcomm? Snapdragon? X16 LTE-A
  iSerial                 3 UF94119009041546
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          226
    bNumInterfaces          4
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              896mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0
      bInterfaceProtocol      0
      iInterface              0
      ** UNRECOGNIZED:  05 24 00 10 01
      ** UNRECOGNIZED:  05 24 01 00 00
      ** UNRECOGNIZED:  04 24 02 02
      ** UNRECOGNIZED:  05 24 06 00 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x000a  1x 10 bytes
        bInterval               9
        bMaxBurst               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0
      bInterfaceProtocol      0
      iInterface              0
      ** UNRECOGNIZED:  05 24 00 10 01
      ** UNRECOGNIZED:  05 24 01 00 00
      ** UNRECOGNIZED:  04 24 02 02
      ** UNRECOGNIZED:  05 24 06 00 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x000a  1x 10 bytes
        bInterval               9
        bMaxBurst               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        8
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              7 rmnet-qmap-0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval               9
        bMaxBurst               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x8e  EP 14 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               2
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x0f  EP 15 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               2
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   0x00000000
      (Missing must-be-set LPM bit!)
  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
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
  (Bus Powered)
2

@Gregor.Herburger,

So the unit booting up with the PID 9090 is a backup/safety mode. The single enumerated port is the DM port through which the unit will receive firmware for a download.

There are a few reasons for this to happen i.e. rebooted it too many times within a short time frame, etc either way it has been mistreated some how, if there ios nothing wrong with the unit, so if the application did reboot it too many times in an uncontrolled way, then resetting the power will make it boot cleanly again and bring it up normally (as seems to be the case here). If there is actually something wrong and it cannot boot the normal firmware, then it will just keep on coming up with this PID.

Regards

Matt

3

Ok. Thank you for the information. I think that could be caused by two problems:

  1. unstable power supply
  2. resetting our board too often
  3. unstable reset pin level

To find out what is the cause of our problem. Can you tell me what rebooted too many times exactly means.
How many resets in what time frame must happen to start in backup/safety mode?

4

@Gregor.Herburger

I cannot remember off the top of my head (and its not really written anywhere easy to find) but it is quite reasonable, something like 8 resets within a 3 minute period.

Regards

Matt

5

Thank you for the information.

I tested today and it seems to be not related to number of resets in a short time.

Is there more informatione when safety mode is entered.

It seems to be randomly when backup mode is entered.

I noticed on system start-up the RESET# pin is not stable. And afterwards when resetting device with gpio from host, module is sometimes in backup mode sometimes not.

Regards
Gregor