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From: Johan Hovold <johan@kernel.org>
To: linux-usb@vger.kernel.org
Cc: Manivannan Sadhasivam <mani@kernel.org>,
	linux-kernel@vger.kernel.org, Johan Hovold <johan@kernel.org>,
	Pho Tran <pho.tran@silabs.com>
Subject: Re: [PATCH] USB: serial: cp210x: suppress modem-control error on open and close
Date: Thu, 21 Jan 2021 11:32:10 +0100	[thread overview]
Message-ID: <YAlYKjRYOzmTht7D@hovoldconsulting.com> (raw)
In-Reply-To: <20210121102922.17439-2-johan@kernel.org>

On Thu, Jan 21, 2021 at 11:29:12AM +0100, Johan Hovold wrote:
> The CP210X_SET_MHS request cannot be used to control DTR/RTS when
> hardware flow control is enabled and instead returns an error which is
> currently logged as:
> 
> 	cp210x ttyUSB0: failed set request 0x7 status: -32
> 
> Add a crtscts flag to keep track of the hardware flow-control setting
> and use it to suppress the request in dtr_rts().
> 
> Note that both lines are still deasserted when disabling the UART as
> part of close().
> 
> Also note that TIOCMSET is left unchanged and will continue to return an
> error to user-space when flow control is enabled (i.e. instead of
> disabling and re-enabling auto-RTS when RTS is deasserted and
> re-asserted).
> 
> Reported-by: Pho Tran <pho.tran@silabs.com>
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---

Oops, this one wasn't supposed to be submitted again. Please ignore.

Johan

  reply	other threads:[~2021-01-21 12:58 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 10:29 [PATCH 00/10] USB: serial: xr: fix up remaining issues in new driver Johan Hovold
2021-01-21 10:29 ` [PATCH] USB: serial: cp210x: suppress modem-control error on open and close Johan Hovold
2021-01-21 10:32   ` Johan Hovold [this message]
2021-01-21 10:29 ` [PATCH 01/10] USB: serial: xr: fix NULL-deref at probe Johan Hovold
2021-01-21 10:29 ` [PATCH 02/10] USB: serial: xr: fix interface leak at disconnect Johan Hovold
2021-01-21 10:29 ` [PATCH 03/10] USB: serial: xr: use subsystem usb_device at probe Johan Hovold
2021-01-21 10:29 ` [PATCH 04/10] USB: serial: xr: use termios flag helpers Johan Hovold
2021-01-21 10:29 ` [PATCH 05/10] USB: serial: xr: document vendor-request recipient Johan Hovold
2021-01-21 10:29 ` [PATCH 06/10] USB: serial: xr: clean up line-settings handling Johan Hovold
2021-01-21 10:29 ` [PATCH 07/10] USB: serial: xr: simplify line-speed logic Johan Hovold
2021-01-21 10:29 ` [PATCH 08/10] USB: serial: xr: fix gpio-mode handling Johan Hovold
2021-01-21 10:29 ` [PATCH 09/10] USB: serial: xr: fix pin configuration Johan Hovold
2021-01-21 10:29 ` [PATCH 10/10] USB: serial: xr: fix B0 handling Johan Hovold
2021-01-26 15:26 ` [PATCH 00/10] USB: serial: xr: fix up remaining issues in new driver Johan Hovold

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