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authorGraf Yang <graf.yang@analog.com>2009-06-11 13:42:17 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-11 08:51:04 -0700
commitf9d36da9cdc2504cd9bb6034cfaba0673ce2d6df (patch)
tree36789122ce363636792d90b809b3bdff20e39876
parent7de7c55bf54dede2bd2262349fc7b558bcc8e413 (diff)
Blackfin Serial Driver: fix missing new lines when under load
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@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/serial/bfin_5xx.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index dfae22d47bf7..676efdad3712 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);