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Commit f9d36da9 authored by Graf Yang's avatar Graf Yang Committed by Linus Torvalds
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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: default avatarGraf Yang <graf.yang@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7de7c55b

drivers/serial/bfin_5xx.c

+1 −0
Original line number Diff line number Diff line
@@ -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);