From f1f836e4209eb904008efeb5faa69839b24fab5b Mon Sep 17 00:00:00 2001 From: Alexander Stein Date: Tue, 14 May 2013 17:06:07 +0200 Subject: [PATCH] serial: imx: Add Rx Fifo overrun error message This patch enables the overrun error (ORE) interrupt and increases the counter in case of overrun. Signed-off-by: Alexander Stein Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 147c9e193595..72bc1dbcd055 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -449,6 +449,13 @@ 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); temp = readl(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; unsigned int sts; + unsigned int sts2; sts = readl(sport->port.membase + USR1); @@ -598,6 +606,13 @@ static irqreturn_t imx_int(int irq, void *dev_id) if (sts & USR1_AWAKE) 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; } -- 2.45.2