linux-kernel - Re: CH341 RTS/CTS flow control disabled in driver?

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Message-ID: <ZfQAZdMwQENJ_yMC@hovoldconsulting.com>
Date: Fri, 15 Mar 2024 09:01:41 +0100
From: Johan Hovold <johan@...nel.org>
To: Cameron Williams <cang1@...e.co.uk>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: CH341 RTS/CTS flow control disabled in driver?

On Thu, Mar 14, 2024 at 10:13:03PM +0000, Cameron Williams wrote:

> I am wondering if anyone knows anything regarding the RTS/CTS lines on
> the CH341 (maybe CH340 though I have no chip example).

> From my tests, neither of them seem to have RTS/CTS respected, and I
> don't believe they are fake?

> Is this intended behaviour? Looking through the source I can see
> RTS/DTR should be supported, but it just doesn't seem to work.

The driver does not implement hardware flow control (CRTSCTS) so this is
expected behaviour.

Johan