From: Johan Hovold <johan@kernel.org>
To: Vasily Khoruzhick <anarsoul@gmail.com>
Cc: linux-usb@vger.kernel.org
Subject: Re: Commit 8a7bf7510d1f ("USB: serial: pl2303: amend and tighten type detection") broke pl2303 driver for my adapter
Date: Wed, 4 Aug 2021 11:29:55 +0200 [thread overview]
Message-ID: <YQpeE19WIeQO2b//@hovoldconsulting.com> (raw)
In-Reply-To: <CA+E=qVcLdZ=gdJa-nV42ey751Dd9gFHWya7v=-y3WejoDYkaHA@mail.gmail.com>
On Tue, Aug 03, 2021 at 11:41:33PM -0700, Vasily Khoruzhick wrote:
> On Fri, Jul 30, 2021 at 5:42 AM Johan Hovold <johan@kernel.org> wrote:
> > On Thu, Jul 29, 2021 at 10:37:00AM -0700, Vasily Khoruzhick wrote:
> > > On Thu, Jul 29, 2021 at 3:02 AM Johan Hovold <johan@kernel.org> wrote:
> > > 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).
> > 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
next prev parent reply other threads:[~2021-08-04 9:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 0:00 Commit 8a7bf7510d1f ("USB: serial: pl2303: amend and tighten type detection") broke pl2303 driver for my adapter Vasily Khoruzhick
2021-07-29 10:02 ` Johan Hovold
2021-07-29 17:37 ` Vasily Khoruzhick
2021-07-30 12:41 ` Johan Hovold
2021-08-04 6:41 ` Vasily Khoruzhick
2021-08-04 9:29 ` Johan Hovold [this message]
2021-08-04 9:31 ` [PATCH] USB: serial: pl2303: fix GT type detection Johan Hovold
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