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List:       linux-serial
Subject:    [PATCH 02/11] Blackfin SPORT UART: fix data misses while using transmit frame sync
From:       Mike Frysinger <vapier () gentoo ! org>
Date:       2009-06-02 7:11:31
Message-ID: 1243926700-30485-2-git-send-email-vapier () gentoo ! org
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From: Michael Hennerich <michael.hennerich@analog.com>

SPORT transmit frame sync (TFS) isn't used as an electrical signal during
normal SPORT UART emulation.  However, it is useful in EIA RS-485
emulation as RS-485 Transceiver Driver Enable DE strobe.

This patch configures:
TFS to be active high in order to drive an DE strobe of
an eventually connected RS-485 Transceiver.

Late frame sync mode (LATFS) gating the entire TX shift cycle.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
 drivers/serial/bfin_sport_uart.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/bfin_sport_uart.c b/drivers/serial/bfin_sport_uart.c
index fd5cb95..6687ccd 100644
--- a/drivers/serial/bfin_sport_uart.c
+++ b/drivers/serial/bfin_sport_uart.c
@@ -149,7 +149,7 @@ static int sport_uart_setup(struct sport_uart_port *up, int sclk, int baud_rate)
 	int tclkdiv, tfsdiv, rclkdiv;
 
 	/* Set TCR1 and TCR2 */
-	SPORT_PUT_TCR1(up, (LTFS | ITFS | TFSR | TLSBIT | ITCLK));
+	SPORT_PUT_TCR1(up, (LATFS | ITFS | TFSR | TLSBIT | ITCLK));
 	SPORT_PUT_TCR2(up, 10);
 	pr_debug("%s TCR1:%x, TCR2:%x\n", __func__, SPORT_GET_TCR1(up), SPORT_GET_TCR2(up));
 
-- 
1.6.3.1

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