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authorJohan Hovold <jhovold@gmail.com>2013-10-16 11:56:14 +0200
committerNicolas Ferre <nicolas.ferre@atmel.com>2013-11-15 12:13:33 +0100
commit6de714c21a8ea315fffba6a93bbe537f4c1bf4f0 (patch)
treec3e0e05dfb0a222220516dd54e4a4f35f817355e /arch/arm/mach-at91/Makefile
parent15c03dd4859ab16f9212238f29dd315654aa94f6 (diff)
ARM: at91: fix hanged boot due to early rtc-interrupt
Make sure the RTC-interrupts are masked at boot by adding a new helper function to be used at SOC-init. This fixes hanged boot on all AT91 SOCs with an RTC (but RM9200), for example, after a reset during an RTC-update or if an RTC-alarm goes off after shutdown (e.g. when using RTC wakeup). The RTC and RTT-peripherals are powered by backup power (VDDBU) (on all AT91 SOCs but RM9200) and are not reset on wake-up, user, watchdog or software reset. This means that their interrupts may be enabled during early boot if, for example, they where not disabled during a previous shutdown (e.g. due to a buggy driver or a non-clean shutdown such as a user reset). Furthermore, an RTC or RTT-alarm may also be active. The RTC and RTT-interrupts use the shared system-interrupt line, which is also used by the PIT, and if an interrupt occurs before a handler (e.g. RTC-driver) has been installed this leads to the system interrupt being disabled and prevents the system from booting. Note that when boot hangs due to an early RTC or RTT-interrupt, the only way to get the system to start again is to remove the backup power (e.g. battery) or to disable the interrupt manually from the bootloader. In particular, a user reset is not sufficient. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: stable@vger.kernel.org # 3.11.x
Diffstat (limited to 'arch/arm/mach-at91/Makefile')
-rw-r--r--arch/arm/mach-at91/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
index 3b0a9538093c..e0fda04e6aa1 100644
--- a/arch/arm/mach-at91/Makefile
+++ b/arch/arm/mach-at91/Makefile
@@ -2,7 +2,7 @@
# Makefile for the linux kernel.
#
-obj-y := irq.o gpio.o setup.o
+obj-y := irq.o gpio.o setup.o sysirq_mask.o
obj-m :=
obj-n :=
obj- :=