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serial: imx: Enable UCR4_OREN in startup interface 

Other than enable Receiver Overrun Interrupt Enable (UCR4_OREN)
in start_tx interface, UCR4_OREN should be enabled before enable
of Receiver.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiada Wang 2014-12-09 18:11:34 +09:00 committed by Greg Kroah-Hartman
parent ee5e7c1091
commit 6f026d6b7c
1 changed files with 8 additions and 7 deletions
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15
drivers/tty/serial/imx.c
View File

@ -611,13 +611,6 @@ static void imx_start_tx(struct uart_port *port)
temp &= ~(UCR1_RRDYEN);
writel(temp, sport->port.membase + UCR1);
}
/* Clear any pending ORE flag before enabling interrupt */
temp = readl(sport->port.membase + USR2);
writel(temp | USR2_ORE, sport->port.membase + USR2);
temp = readl(sport->port.membase + UCR4);
temp |= UCR4_OREN;
writel(temp, sport->port.membase + UCR4);
if (!sport->dma_is_enabled) {
temp = readl(sport->port.membase + UCR1);
@ -1178,6 +1171,14 @@ static int imx_startup(struct uart_port *port)
writel(temp, sport->port.membase + UCR1);
/* Clear any pending ORE flag before enabling interrupt */
temp = readl(sport->port.membase + USR2);
writel(temp | USR2_ORE, sport->port.membase + USR2);
temp = readl(sport->port.membase + UCR4);
temp |= UCR4_OREN;
writel(temp, sport->port.membase + UCR4);
temp = readl(sport->port.membase + UCR2);
temp |= (UCR2_RXEN | UCR2_TXEN);
if (!sport->have_rtscts)