linux-kernel - [PATCH 07/11] Blackfin Serial Driver: fix missing new lines when under load

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Message-Id: <1243926700-30485-7-git-send-email-vapier@gentoo.org>
Date:	Tue,  2 Jun 2009 03:11:36 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	uclinux-dist-devel@...ckfin.uclinux.org,
	Graf Yang <graf.yang@...log.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 07/11] Blackfin Serial Driver: fix missing new lines when under load

From: Graf Yang <graf.yang@...log.com>

Add a SSYNC() into bfin_serial_dma_tx_chars() to ensure DMA registers are
written with new data otherwise we might miss a byte or two when the
system is under load.  PIO mode is OK though.

Signed-off-by: Graf Yang <graf.yang@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 drivers/serial/bfin_5xx.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index dfae22d..676efda 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -415,6 +415,7 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 	set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 	set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 	set_dma_x_modify(uart->tx_dma_channel, 1);
+	SSYNC();
 	enable_dma(uart->tx_dma_channel);
 
 	UART_SET_IER(uart, ETBEI);
-- 
1.6.3.1

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