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serial/mxs-auart: only wake up tty layer once 

There is no need to call uart_write_wakeup after each character send.
Once at the end of the write sequence is enough.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Uwe Kleine-König 2011-11-22 14:22:56 +01:00 committed by Greg Kroah-Hartman
parent f227824e84
commit d0758a285c
1 changed files with 3 additions and 2 deletions
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5
drivers/tty/serial/mxs-auart.c
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@ -145,11 +145,12 @@ static inline void mxs_auart_tx_chars(struct mxs_auart_port *s)
writel(xmit->buf[xmit->tail],
s->port.membase + AUART_DATA);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&s->port);
} else
break;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&s->port);
if (uart_circ_empty(&(s->port.state->xmit)))
writel(AUART_INTR_TXIEN,
s->port.membase + AUART_INTR_CLR);