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tty: serial: imx: disable irq after suspend

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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 <[email protected]>
Signed-off-by: Maxim Yu. Osipov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Maxim Yu. Osipov 2017-08-14 16:27:49 +02:00 • committed by Greg Kroah-Hartman
commit 81b289cc14
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/imx.c
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@ -2321,6 +2321,7 @@ static int imx_serial_port_suspend(struct device *dev)
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 @@ static int imx_serial_port_resume(struct device *dev)
serial_imx_enable_wakeup(sport, false);
uart_resume_port(&imx_reg, &sport->port);
enable_irq(sport->port.irq);
clk_unprepare(sport->clk_ipg);