Re: non-standard baud rates with Prolific 2303 USB-serial

From: Joe Abbott <jabbott@rollanet.org>
To: Johan Hovold <johan@kernel.org>
Cc: "Michael G. Katzmann" <michaelk@ieee.org>,
	charles-yeh@prolific.com.tw, linux-serial@vger.kernel.org,
	linux-usb@vger.kernel.org, Charles Yeh <charlesyeh522@gmail.com>
Subject: Re: non-standard baud rates with Prolific 2303 USB-serial
Date: Wed, 24 Feb 2021 17:08:28 -0600	[thread overview]
Message-ID: <CADuz4ON8Jj5unz_eeD--7n5kp2uQmqeyM_2-DTrTFKFwFtoudw@mail.gmail.com> (raw)
In-Reply-To: <YDPgVZ4GbNq6cGDP@hovoldconsulting.com>

On Mon, Feb 22, 2021 at 10:48 AM Johan Hovold <johan@kernel.org> wrote:

>
> Joe, would you mind posting the output of "lsusb -v" for your device as
> well?
>
Bus 007 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x067b Prolific Technology, Inc.
  idProduct          0x2303 PL2303 Serial Port
  bcdDevice            3.00
  iManufacturer           1 Prolific Technology Inc.
  iProduct                2 USB-Serial Controller
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           39
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x000a  1x 10 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        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     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
Device Status:     0x0000
  (Bus Powered)

Also, here's the 110b windows wireshark capture
https://drive.google.com/file/d/1HP5RMRtP11zm4uQNzqlcbILGwebDJaOz/view?usp=sharing

Joe