Sierra 3G modem in Linux 3.14.28

fang — Sun, 01 May 2016 00:51:33 GMT

Sierra MC8705 modem works fine in Linux 3.10.53 (Sierra_net.c V3.2)

Using this modem on our board(imx6Q SabreSD board), it works in the field for over one year.

Last week I upgraded Linux to 3.14.28(imx_3.14.28_1.0.0_ga) (Sierra_net.c V3.2).

After that, modem is detected but it doesn't work.

# ifconfig wwan0

ifconfig: wwan0: error fetching interface information: Device not found

# dmesg | grep -e sierra -e Sierra

[ 5.009833] usbcore: registered new interface driver sierra

[ 5.016359] usbserial: USB Serial support registered for Sierra USB modem

[ 5.025902] sierra 1-1.2:1.0: Sierra USB modem converter detected

[ 5.068022] usb 1-1.2: Sierra USB modem converter now attached to ttyUSB0

[ 5.076418] sierra 1-1.2:1.1: Sierra USB modem converter detected

[ 5.085750] usb 1-1.2: Sierra USB modem converter now attached to ttyUSB1

[ 5.095794] sierra 1-1.2:1.2: Sierra USB modem converter detected

[ 5.107202] usb 1-1.2: Sierra USB modem converter now attached to ttyUSB2

[ 5.121224] sierra 1-1.2:1.3: Sierra USB modem converter detected

[ 5.132774] usb 1-1.2: Sierra USB modem converter now attached to ttyUSB3

[ 5.143377] sierra 1-1.2:1.4: Sierra USB modem converter detected

[ 5.152881] usb 1-1.2: Sierra USB modem converter now attached to ttyUSB4

# lsusb

Bus 001 Device 003: ID 1199:68a3 Sierra Wireless, Inc. MC8700 Modem

Bus 001 Device 002: ID 0424:2412 Standard Microsystems Corp.

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

# cat /dev/ttyUSB3

+CREG: 2,1,"2252","014C0E9E",2

*CNTI: 0,UMTS

...

# dmesg | grep -e pci -e PCI

[ 0.235767] PCI: CLS 0 bytes, default 64

[ 1.403808] imx6q-pcie 1ffc000.pcie: phy link never came up

[ 1.403827] imx6q-pcie 1ffc000.pcie: Failed to bring link up!

[ 1.403858] imx6q-pcie 1ffc000.pcie: failed to initialize host

[ 1.403908] imx6q-pcie: probe of 1ffc000.pcie failed with error -22

[ 2.690746] ehci-pci: EHCI PCI platform driver

I use the same SIM card, board, modem and rootfs as I tested on Linux 3.10.53.

Yesterday I read many threads related to modem in this community, and tried below:

1. Add more delay in imx6_pcie_wait_for_link in pci-imx6.c:

change to usleep_range(100, 1000), or chang count = 10000

2. Disable CONFIG_PCI_MSI

3. Remove #address_cells; #size_cells of intc in imx6qdl.dtsi

it still no wwan0 interface.

I'm really appreciate if someone can give me some idea.

PS. Is there any official released patches for Linux imx_3.14.28_1.0.0_ga?

Thanks.

Re: Sierra 3G modem in Linux 3.14.28

igorpadykov — Sun, 01 May 2016 01:01:15 GMT

Hi jifang

for 3.14.28 one can look at solutions in

IMX6Q: Linux boot halts at PCIe config space read

Best regards

igor

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i.MX ProcessorsのトピックSierra 3G modem in Linux 3.14.28

Sierra 3G modem in Linux 3.14.28

Re: Sierra 3G modem in Linux 3.14.28