tty: serial: imx: disable irq after suspend
If any key on console is pressed when board is suspended,
board hangs.
Driver's interrupt handler must be guaranteed not to run while
resume/suspend_noirq() are being executed. See include/linux/pm.h
for details.
Tested on i.MX6 based board.
The idea of this fix is based on commit in official i.MX kernel tree:
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git
commit 81e8e7d91d81 ("tty: serial: imx: disable irq after suspend")
Disable rx irq after suspend to avoid interrupt coming in early resume.
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Maxim Yu. Osipov <mosipov@ilbers.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 3964ae5..d879a9b 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2321,6 +2321,7 @@
serial_imx_enable_wakeup(sport, true);
uart_suspend_port(&imx_reg, &sport->port);
+ disable_irq(sport->port.irq);
/* Needed to enable clock in suspend_noirq */
return clk_prepare(sport->clk_ipg);
@@ -2335,6 +2336,7 @@
serial_imx_enable_wakeup(sport, false);
uart_resume_port(&imx_reg, &sport->port);
+ enable_irq(sport->port.irq);
clk_unprepare(sport->clk_ipg);