openwrt / openwrt/mt76

Comfast CF-926AC does not change its USB ID

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Description

In OpenWrt 19.07, I installed kmod-mt76x2u (version: 4.14.172+2020-03-10-08054d5a-1-d3f64c5022212753017f85fd9365b83f.0) for Comfast CF-926AC. It is USB 3.0 dual-band 2T2R Wi-Fi dongle with chipset Mediatek MT7612U is detected as mass storage device.

On router:
dmesg:

[  706.765409] usb 2-1: new high-speed USB device number 3 using xhci-hcd
[  706.956529] usb-storage 2-1:1.0: USB Mass Storage device detected
[  706.973423] scsi host3: usb-storage 2-1:1.0
[  707.985568] scsi 3:0:0:0: CD-ROM            MediaTek Flash autorun    0.01 PQ: 0 ANSI: 0 CC

lsusb -v

Bus 002 Device 006: ID 0e8d:2870 MediaTek Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0e8d MediaTek Inc.
  idProduct          0x2870 
  bcdDevice            0.01
  iManufacturer           1 Љ
  iProduct                2 Љ
  iSerial                 3 Љ
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              160mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0002
  (Bus Powered)
  Remote Wakeup Enabled

On GNU/Linux distro with kernel 5.6.0-1-default:

dmesg

[21706.282852] usb 1-2: new high-speed USB device number 6 using xhci_hcd
[21706.305276] usb 1-2: New USB device found, idVendor=0e8d, idProduct=2870, bcdDevice= 0.01
[21706.305281] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[21706.305284] usb 1-2: Product: Љ
[21706.305287] usb 1-2: Manufacturer: Љ
[21706.305289] usb 1-2: SerialNumber: Љ
[21706.308919] usb-storage 1-2:1.0: USB Mass Storage device detected
[21706.309516] scsi host4: usb-storage 1-2:1.0
[21706.967709] usb 1-2: USB disconnect, device number 6
[21707.879244] usb 2-3: new SuperSpeed Gen 1 USB device number 90 using xhci_hcd
[21707.901685] usb 2-3: New USB device found, idVendor=0e8d, idProduct=7612, bcdDevice= 1.00
[21707.901691] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[21707.901694] usb 2-3: Product: 802.11ac WLAN
[21707.901697] usb 2-3: Manufacturer: MediaTek Inc.
[21707.901699] usb 2-3: SerialNumber: 000000000
[21708.039806] usb 2-3: reset SuperSpeed Gen 1 USB device number 90 using xhci_hcd
[21708.061751] mt76x2u 2-3:1.0: ASIC revision: 76120044
[21708.100333] mt76x2u 2-3:1.0: ROM patch build: 20141115060606a
[21708.249742] mt76x2u 2-3:1.0: Firmware Version: 0.0.00
[21708.249747] mt76x2u 2-3:1.0: Build: 1
[21708.249750] mt76x2u 2-3:1.0: Build Time: 201507311614____
[21709.208759] ieee80211 phy89: Selected rate control algorithm 'minstrel_ht'
[21709.845941] mt76x2u 2-3:1.0 wlp0s20f0u3: renamed from wlan0

lsusb -v

Bus 002 Device 102: ID 0e8d:7612 MediaTek Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         9
  idVendor           0x0e8d MediaTek Inc.
  idProduct          0x7612 
  bcdDevice            1.00
  iManufacturer           1 
  iProduct                2 
  iSerial                 3 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x007a
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          2 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              800mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           8
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              2 
      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               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 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     0x08  EP 8 OUT
        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     0x04  EP 4 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x05  EP 5 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x06  EP 6 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x07  EP 7 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x09  EP 9 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               1

Based on the USB ID, I see that this should be supported with this driver.

If there's anything what you need, let me know.

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with mt76x2/usb.c at the linked USB-device handling and compare the OpenWrt 19.07 enumeration logs with the working GNU/Linux logs. Reproduce the adapter detection on OpenWrt and verify that it changes from mass-storage ID 0e8d:2870 to 0e8d:7612 and loads mt76x2u.

Written by the indexing model from the issue text.

Assessment

Tech stack
c, linux
Domain
embedded-iot, operating-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
42/100

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