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

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On Wed, 2018-12-19 at 10:22 +0800, Macpaul Lin wrote:
> On Wed, 2018-12-19 at 01:48 +0800, Macpaul Lin wrote:
> > On Tue, 2018-12-18 at 23:42 +0700, Lars Melin wrote:
> > > On 12/18/2018 22:19, Macpaul Lin wrote:
> > > 
> > > 
> > > > Hi all,
> > > > 
> > > > After double check the PID/VID officially used (registered) by Mediatek
> > > > Inc. The following VID/PID maps to the corresponding USB interface of
> > > > the firmware of cell phone.
> > > > VID:0x0e8d, PID:0x0003: Mediatek BROM.
> > > > VID:0x0e8d, PID:0x2000: Mediatek Preloader.
> > > > 
> > > > I will update Patch v6 for changing Andrey's previous comments.
> > > > 
> > > 
> > > You should show us a verbose lsusb of your 0e8d:0003 before changing
> > > Andrey's submission.
> > > 
> > > 
> > > Season's Greeting
> > > Lars
> > 
Hi Lars,

Sorry I just missed your explain about the UNION descriptor and did not 
found in my mail box.
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)

Bus 001 Device 002: ID 0e8d:2000 MediaTek Inc. MT65xx Preloader
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            2 Communications
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x0e8d MediaTek Inc.
  idProduct          0x2000 MT65xx Preloader
  bcdDevice            1.00
  iManufacturer           1 (error)
  iProduct                2 (error)
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           70
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          3 (error)
    bmAttributes         0xc0
      Self Powered
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 CDC Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0
      iInterface              4 (error)
      Endpoint Descriptor:
        bLength                 8
        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
      Endpoint Descriptor:
        bLength                 8
        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
    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              5 (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        1
        bSlaveInterface         0
      CDC Call Management:
        bmCapabilities       0x03
          call management
          use DataInterface
        bDataInterface          0
      Endpoint Descriptor:
        bLength                 8
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval              16
Device Status:     0x13f0
  (Bus Powered)
  Debug Mode

Regards,
Macpaul Lin




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