Re: Commit 8a7bf7510d1f ("USB: serial: pl2303: amend and tighten type detection") broke pl2303 driver for my adapter

On Tue, Aug 03, 2021 at 11:41:33PM -0700, Vasily Khoruzhick wrote:

On Fri, Jul 30, 2021 at 5:42 AM Johan Hovold [off-list ref] wrote:

quoted

On Thu, Jul 29, 2021 at 10:37:00AM -0700, Vasily Khoruzhick wrote:

quoted

On Thu, Jul 29, 2021 at 3:02 AM Johan Hovold [off-list ref] wrote:

quoted

quoted

Bus 001 Device 024: ID 067b:23c3 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          0x23c3
  bcdDevice            3.05

Thanks. Based on the above it looks like either a TA using the default
GT idProduct and new subminor release number (3.05), or it's a GT with
an undocumented release number (the datasheet says it should be 1.00).

quoted

Could you try applying the patch below and check the log for that
pl2303_supports_hx_status() printk? If it is indeed a GT then this
should also make the device work again.

Thanks, with this patch it works:

[793566.912312] usb 1-1: new full-speed USB device number 43 using xhci_hcd
[793567.053688] usb 1-1: New USB device found, idVendor=067b,
idProduct=23c3, bcdDevice= 3.05
[793567.053702] usb 1-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[793567.053708] usb 1-1: Product: USB-Serial Controller
[793567.053712] usb 1-1: Manufacturer: Prolific Technology Inc.
[793567.053716] usb 1-1: SerialNumber: CMA>b103Y23
[793567.056684] pl2303 1-1:1.0: pl2303 converter detected
[793567.056956] pl2303 1-1:1.0: pl2303_supports_hx_status - ret = -32
[793567.057281] usb 1-1: pl2303 converter now attached to ttyUSB0

I tested it with picocom at 115200 baud.

You can have my:

Tested-by: Vasily Khoruzhick <anarsoul@gmail.com>

Thanks for testing. I'll reply with a patch to get this fixed in 5.14-rc
and backported to 5.13.

Johan