From 018e7448f2b2beba4a58f4c7fe99a5b32542be4c Mon Sep 17 00:00:00 2001
From: Philippe Proulx <philippe.proulx@savoirfairelinux.com>
Date: Wed, 23 Oct 2013 18:49:58 -0400
Subject: [PATCH] serial: omap: improve RS-485 performance

If RS-485 is enabled, make the OMAP UART fire THR interrupts when both
TX FIFO and TX shift register are empty instead of polling the
equivalent status bit. This removes the burst of interrupt requests
seen at every end of transmission.

Also: the comment said that the TX FIFO trigger level was set at 16
characters when it's 32 in reality.

Signed-off-by: Philippe Proulx <philippe.proulx@savoirfairelinux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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