diff options
| author | Alexander Stein <alexander.stein@systec-electronic.com> | 2013-05-14 17:06:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-20 11:53:46 -0700 |
| commit | f1f836e4209eb904008efeb5faa69839b24fab5b (patch) | |
| tree | 59224b3e9451e9968f4de5f2e36f24d40f35a5be /drivers/tty | |
| parent | ea33640a933e208301fea4fe7cbc6cc288e32cc6 (diff) | |
| download | linux-f1f836e4209eb904008efeb5faa69839b24fab5b.tar.bz2 | |
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 <alexander.stein@systec-electronic.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 15 |
1 files changed, 15 insertions, 0 deletions
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; } |