Re: [PATCH v5] cdc-acm: fix abnormal DATA RX issue for Mediatek Preloader.

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On 12/19/2018 10:16, Macpaul Lin wrote:

.
Here comes the verbose lsusb -v dump.

Bus 001 Device 003: ID 0e8d:0003 MediaTek Inc. MT6227 phone
[432/3160]
Device Descriptor:
   bLength                18
   bDescriptorType         1
   bcdUSB               1.10
   bDeviceClass            2 Communications
   bDeviceSubClass         0
   bDeviceProtocol         0
   bMaxPacketSize0        64
   idVendor           0x0e8d MediaTek Inc.
   idProduct          0x0003 MT6227 phone
   bcdDevice            1.00
   iManufacturer           0
   iProduct                0
   iSerial                 0
   bNumConfigurations      1
   Configuration Descriptor:
     bLength                 9
     bDescriptorType         2
     wTotalLength           67
     bNumInterfaces          2
     bConfigurationValue     1
     iConfiguration          0
     bmAttributes         0x80
       (Bus Powered)
     MaxPower                0mA
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        0
       bAlternateSetting       0
       bNumEndpoints           1
       bInterfaceClass         2 Communications
       bInterfaceSubClass      2 Abstract (modem)
       bInterfaceProtocol      1 AT-commands (v.25ter)
       iInterface              1 (error)
       CDC Header:
         bcdCDC               1.10
       CDC ACM:
         bmCapabilities       0x0f
           connection notifications
           sends break
           line coding and serial state
           get/set/clear comm features
       CDC Union:
         bMasterInterface        0
         bSlaveInterface         1
       CDC Call Management:
         bmCapabilities       0x03
           call management
           use DataInterface
         bDataInterface          1
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x84  EP 4 IN
         bmAttributes            3
           Transfer Type            Interrupt
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0040  1x 64 bytes
         bInterval               1
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        1
       bAlternateSetting       0
       bNumEndpoints           2
       bInterfaceClass        10 CDC Data
       bInterfaceSubClass      0 Unused
       bInterfaceProtocol      0
       iInterface              2 (error)
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x81  EP 1 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     0x01  EP 1 OUT
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0200  1x 512 bytes
         bInterval               0
Device Status:     0x7410
   (Bus Powered)

Regards,
Macpaul Lin


Hi Macpaul,
your verbose usb listing show me that Mediatek has made two different 0e8d:003 devices, see my verbose lsusb listing below. (Notice also the reverse order for cmd and data interfaces in it compared to yours).
USB id's are intended to identify a device and its needs so there should
never be more than one unique device per id.


Fairphone FP-1, MT6227  (no CDC union !!!)


MI_00 USB Single Port


Bus 001 Device 004: ID 0e8d:0003
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            2 Communications
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x0e8d
  idProduct          0x0003
  bcdDevice            0.01
  iManufacturer           3 MediaTek Inc
  iProduct                4 SEATTLE
  iSerial                 5 534574001004
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           67
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA

    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0
      iInterface              1 6218B COM
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0

    Interface Descriptor:
      bLength                28
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol      1 AT-commands (v.25ter)
      iInterface              2 6218B COM
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval               1
Device Status:     0x0000
  (Bus Powered)


/Lars



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