[PATCH v3 3/3] ARM: at91/rtc: disable interrupts at shutdown
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From: Nicolas Ferre <hidden>
Date: 2013-11-15 10:43:23
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On 16/10/2013 11:56, Johan Hovold :
Make sure RTC-interrupts are disabled at shutdown. As the RTC is generally powered by backup power (VDDBU), its interrupts are not disabled on wake-up, user, watchdog or software reset. This could cause troubles on other systems (e.g. older kernels) if an interrupt occurs before a handler has been installed at next boot. Let us be well-behaved and disable them on clean shutdowns at least (as do the RTT-based rtc-at91sam9 driver). Signed-off-by: Johan Hovold <redacted>
Acked-by: Nicolas Ferre <redacted> Thank you Johan. Andrew, could you add this patch to your rtc queue or should I re-send it ? Best regards,
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--- drivers/rtc/rtc-at91rm9200.c | 9 +++++++++ 1 file changed, 9 insertions(+)diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c index 7418926..ea088e9 100644 --- a/drivers/rtc/rtc-at91rm9200.c +++ b/drivers/rtc/rtc-at91rm9200.c@@ -442,6 +442,14 @@ static int __exit at91_rtc_remove(struct platform_device *pdev) return 0; } +static void at91_rtc_shutdown(struct platform_device *pdev) +{ + /* Disable all interrupts */ + at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | + AT91_RTC_SECEV | AT91_RTC_TIMEV | + AT91_RTC_CALEV); +} + #ifdef CONFIG_PM_SLEEP /* AT91RM9200 RTC Power management control */@@ -480,6 +488,7 @@ static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume); static struct platform_driver at91_rtc_driver = { .remove = __exit_p(at91_rtc_remove), + .shutdown = at91_rtc_shutdown, .driver = { .name = "at91_rtc", .owner = THIS_MODULE,
-- Nicolas Ferre