linux-kernel - Re: [PATCH] serial: imx: ensure RTS signal is not left active after shutdown

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Message-ID: <63f0a3a4-f1ea-4b85-afde-d7b82bb95ade@rasmusvillemoes.dk>
Date: Tue, 18 Jun 2024 13:05:24 +0200
From: Rasmus Villemoes <linux@...musvillemoes.dk>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>
Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] serial: imx: ensure RTS signal is not left active after
 shutdown

On 24/05/2024 14.12, Rasmus Villemoes wrote:
> If a process is killed while writing to a /dev/ttymxc* device in RS485
> mode, we observe that the RTS signal is left high, thus making it
> impossible for other devices to transmit anything.

Ping. Any comments on this? I'm of course open to discussing other ways
of fixing this, but I'd really like a fix to land in 6.11.

It reproduces completely reliably for me, and I assume it affects any
board with this IP, not just imx8mp.

Rasmus