linux-kernel - [PATCH 0/1] serial: sc16is7xx: announce support of SER_RS485_RTS_ON

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Message-ID: <20240428144541.80812-1-rilian.la.te@ya.ru>
Date: Sun, 28 Apr 2024 17:45:32 +0300
From: Konstantin Pugin <rilian.la.te@...ru>
To: 
Cc: krzk@...nel.org,
	conor@...nel.org,
	lkp@...el.com,
	vz@...ia.com,
	robh@...nel.org,
	jcmvbkbc@...il.com,
	nicolas.ferre@...rochip.com,
	manikanta.guntupalli@....com,
	corbet@....net,
	ychuang3@...oton.com,
	u.kleine-koenig@...gutronix.de,
	Maarten.Brock@...ls.nl,
	linux-stable@...r.kernel.org,
	Konstantin Pugin <rilian.la.te@...ru>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Hugo Villeneuve <hvilleneuve@...onoff.com>,
	Andy Shevchenko <andy@...nel.org>,
	Lech Perczak <lech.perczak@...lingroup.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: [PATCH 0/1] serial: sc16is7xx: announce support of SER_RS485_RTS_ON_SEND

When specifying flag SER_RS485_RTS_ON_SEND in RS485 configuration,
we get the following warning after commit 4afeced55baa ("serial: core:
fix sanitizing check for RTS settings"):

    invalid RTS setting, using RTS_AFTER_SEND instead

This results in SER_RS485_RTS_AFTER_SEND being set and the
driver always write to the register field SC16IS7XX_EFCR_RTS_INVERT_BIT,
which breaks some hardware using these chips.

The hardware supports both RTS_ON_SEND and RTS_AFTER_SEND modes, so fix
this by announcing support for RTS_ON_SEND.

This patch is extracted from my XR20M117X series as it is affect all SC16IS7XX hardware.
This bug affects all kernel series from 6.1 onwards.

Konstantin Pugin (1):
  serial: sc16is7xx: announce support of SER_RS485_RTS_ON_SEND

 drivers/tty/serial/sc16is7xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


base-commit: 660a708098569a66a47d0abdad998e29e1259de6
-- 
2.44.0