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serial: imx: Add Rx Fifo overrun error message

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This patch enables the overrun error (ORE) interrupt and increases the
counter in case of overrun.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Stein 2013-05-14 17:06:07 +02:00 committed by Greg Kroah-Hartman
parent ea33640a93
commit f1f836e420
1 changed files with 15 additions and 0 deletions
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15
drivers/tty/serial/imx.c
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@ -449,6 +449,13 @@ static void imx_start_tx(struct uart_port *port)
temp &= ~(UCR1_RRDYEN); temp &= ~(UCR1_RRDYEN);
writel(temp, sport->port.membase + UCR1); 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 + UCR1); temp = readl(sport->port.membase + UCR1);
writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1); writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
@ -582,6 +589,7 @@ static irqreturn_t imx_int(int irq, void *dev_id)
{ {
struct imx_port *sport = dev_id; struct imx_port *sport = dev_id;
unsigned int sts; unsigned int sts;
unsigned int sts2;
sts = readl(sport->port.membase + USR1); sts = readl(sport->port.membase + USR1);
@ -598,6 +606,13 @@ static irqreturn_t imx_int(int irq, void *dev_id)
if (sts & USR1_AWAKE) if (sts & USR1_AWAKE)
writel(USR1_AWAKE, sport->port.membase + USR1); writel(USR1_AWAKE, sport->port.membase + USR1);
sts2 = readl(sport->port.membase + USR2);
if (sts2 & USR2_ORE) {
dev_err(sport->port.dev, "Rx FIFO overrun\n");
sport->port.icount.overrun++;
writel(sts2 | USR2_ORE, sport->port.membase + USR2);
}
return IRQ_HANDLED; return IRQ_HANDLED;
} }