On Tue, Oct 05, 2021 at 05:28:24PM +0100, Adrian Knagg-Baugh wrote:
> Hi,
> As requested in dmesg I'm reporting an unknown device type for the
> pl2303 driver. Here's the extract from dmesg:
>
> [ 2824.450073] usb 1-2: new full-speed USB device number 5 using xhci_hcd
> [ 2824.621910] usb 1-2: New USB device found, idVendor=067b,
> idProduct=23d3, bcdDevice= 4.05
> [ 2824.621922] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [ 2824.621926] usb 1-2: Product: USB-Serial Controller
> [ 2824.621928] usb 1-2: Manufacturer: Prolific Technology Inc.
> [ 2824.621931] usb 1-2: SerialNumber: EKCRb19B616
> [ 2824.630068] pl2303 1-2:1.0: pl2303 converter detected
> [ 2824.630084] pl2303 1-2:1.0: unknown device type, please report to
> linux-usb@xxxxxxxxxxxxxxx
>
> adrian@mononoke:~$ uname -a
> Linux mononoke 5.13.0-16-generic #16-Ubuntu SMP Fri Sep 3 14:53:27 UTC
> 2021 x86_64 x86_64 x86_64 GNU/Linux
>
> The pl2303 is in a Skywatcher telescope synscan handset, the behaviour
> is a regression since it was working fine in the 5.11 kernels packaged
> with Ubuntu 21.04, it's only since updating to 5.13 (which I've had to
> do to resolve issues with the graphics card in my new laptop) that
> I've seen the problem.
>
> See below for the output of sudo lsusb -v
>
> I hope this helps.
Thanks for the report. This should already have been fixed by commit
dcf097e7d21f ("USB: serial: pl2303: fix GL type detection") which was
backported to v5.13.15 (released about a month ago).
Do you know what type of pl2303 you have in your device by any chance?
The author of the above patch had a PL2303GL but it would be useful to
know if there are other types using the same bcdDevice.
Johan
> Bus 003 Device 003: ID 067b:23d3 Prolific Technology, Inc. USB-Serial Controller
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 2.00
> bDeviceClass 0
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 64
> idVendor 0x067b Prolific Technology, Inc.
> idProduct 0x23d3
> bcdDevice 4.05
> iManufacturer 1 Prolific Technology Inc.
> iProduct 2 USB-Serial Controller
> iSerial 3 EKCRb19B616
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 0x0027
> 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)
