On a imx system with ttymxc0, ttymxc1 and ttymxc4 registered we see the
following output from 'cat /proc/interrupts':
$ cat /proc/interrupts
CPU0
...
58: 39 GIC 58 2020000.serial
67: 115 GIC 67 21f8000.i2c
The only uart irq that appears is ttymxc0, which is the console.
As ttymxc1 and ttymxc4 will only have their irq registered at imx_startup(),
they are not shown right after probe.
Transmitting to ttymxc1 and ttymxc4 will cause their irqs to be registered, but
the output shows:
$ echo "111111" > /dev/ttymxc1
$ echo "444444" > /dev/ttymxc4
$ cat /proc/interrupts
CPU0
...
58: 150 GIC 58 2020000.serial
59: 1 GIC 59
62: 1 GIC 62
67: 115 GIC 67 21f8000.i2c
,which misses printing the associated device address.
In order to fix this, register all the irqs inside the probe function via
devm_request_irq(), which will correctly report the serial interrupts associated
with their correspondent serial device and also helps simplyfing the code by
avoiding the calls to free_irq().
$ echo "111111" > /dev/ttymxc1
$ echo "444444" > /dev/ttymxc4
$ cat /proc/interrupts
CPU0
....
58: 202 GIC 58 2020000.serial
59: 1 GIC 59 21e8000.serial
62: 1 GIC 62 21f4000.serial
67: 115 GIC 67 21f8000.i2c
Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
---
drivers/tty/serial/imx.c | 78 +++++++++++++++++++-----------------------------
1 file changed, 30 insertions(+), 48 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 8f62a3c..e4a2846 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1109,37 +1109,6 @@ static int imx_startup(struct uart_port *port)
while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0))
udelay(1);
- /*
- * Allocate the IRQ(s) i.MX1 has three interrupts whereas later
- * chips only have one interrupt.
- */
- if (sport->txirq > 0) {
- retval = request_irq(sport->rxirq, imx_rxint, 0,
- dev_name(port->dev), sport);
- if (retval)
- goto error_out1;
-
- retval = request_irq(sport->txirq, imx_txint, 0,
- dev_name(port->dev), sport);
- if (retval)
- goto error_out2;
-
- /* do not use RTS IRQ on IrDA */
- if (!USE_IRDA(sport)) {
- retval = request_irq(sport->rtsirq, imx_rtsint, 0,
- dev_name(port->dev), sport);
- if (retval)
- goto error_out3;
- }
- } else {
- retval = request_irq(sport->port.irq, imx_int, 0,
- dev_name(port->dev), sport);
- if (retval) {
- free_irq(sport->port.irq, sport);
- goto error_out1;
- }
- }
-
spin_lock_irqsave(&sport->port.lock, flags);
/*
* Finally, clear and enable interrupts
@@ -1202,12 +1171,6 @@ static int imx_startup(struct uart_port *port)
return 0;
-error_out3:
- if (sport->txirq)
- free_irq(sport->txirq, sport);
-error_out2:
- if (sport->rxirq)
- free_irq(sport->rxirq, sport);
error_out1:
return retval;
}
@@ -1255,17 +1218,6 @@ static void imx_shutdown(struct uart_port *port)
del_timer_sync(&sport->timer);
/*
- * Free the interrupts
- */
- if (sport->txirq > 0) {
- if (!USE_IRDA(sport))
- free_irq(sport->rtsirq, sport);
- free_irq(sport->txirq, sport);
- free_irq(sport->rxirq, sport);
- } else
- free_irq(sport->port.irq, sport);
-
- /*
* Disable all interrupts, port and break condition.
*/
@@ -1929,6 +1881,36 @@ static int serial_imx_probe(struct platform_device *pdev)
sport->port.uartclk = clk_get_rate(sport->clk_per);
+ /*
+ * Allocate the IRQ(s) i.MX1 has three interrupts whereas later
+ * chips only have one interrupt.
+ */
+ if (sport->txirq > 0) {
+ ret = devm_request_irq(&pdev->dev, sport->rxirq, imx_rxint, 0,
+ dev_name(&pdev->dev), sport);
+ if (ret)
+ return ret;
+
+ ret = devm_request_irq(&pdev->dev, sport->txirq, imx_txint, 0,
+ dev_name(&pdev->dev), sport);
+ if (ret)
+ return ret;
+
+ /* do not use RTS IRQ on IrDA */
+ if (!USE_IRDA(sport)) {
+ ret = devm_request_irq(&pdev->dev, sport->rtsirq,
+ imx_rtsint, 0,
+ dev_name(&pdev->dev), sport);
+ if (ret)
+ return ret;
+ }
+ } else {
+ ret = devm_request_irq(&pdev->dev, sport->port.irq, imx_int, 0,
+ dev_name(&pdev->dev), sport);
+ if (ret)
+ return ret;
+ }
+
imx_ports[sport->port.line] = sport;
platform_set_drvdata(pdev, sport);
--
1.9.1
--
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