From: Nicolas Ferre <nicolas.ferre@atmel.com>
Date: Mon, 11 May 2015 11:00:31 +0000 (+0200)
Subject: tty/serial: at91: RS485 mode: 0 is valid for delay_rts_after_send
X-Git-Tag: v3.2.71~97
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f312564391d123f530d30ea4d1d9431dd7f5a6dc;p=pandora-kernel.git

tty/serial: at91: RS485 mode: 0 is valid for delay_rts_after_send

commit 8687634b7908c42eb700e0469e110e02833611d1 upstream.

In RS485 mode, we may want to set the delay_rts_after_send value to 0.
In the datasheet, the 0 value is said to "disable" the Transmitter Timeguard but
this is exactly the expected behavior if we want no delay...

Moreover, if the value was set to non-zero value by device-tree or earlier
ioctl command, it was impossible to change it back to zero.

Reported-by: Sami Pietikäinen <Sami.Pietikainen@wapice.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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