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Nicolas Ferre 0ef1594c01 drivers/rtc/rtc-at91rm9200.c: use a variable for storing IMR 
On some revisions of AT91 SoCs, the RTC IMR register is not working.
Instead of elaborating a workaround for that specific SoC or IP version,
we simply use a software variable to store the Interrupt Mask Register
and modify it for each enabling/disabling of an interrupt.  The overhead
of this is negligible anyway.

The interrupt mask register (IMR) for the RTC is broken on the AT91SAM9x5
sub-family of SoCs (good overview of the members here:
http://www.eewiki.net/display/linuxonarm/AT91SAM9x5 ).  The "user visible
effect" is the RTC doesn't work.

That sub-family is less than two years old and only has devicetree (DT)
support and came online circa lk 3.7 .  The dust is yet to settle on the
DT stuff at least for AT91 SoCs (translation: lots of stuff is still
broken, so much that it is hard to know where to start).

The fix in the patch is pretty simple: just shadow the silicon IMR
register with a variable in the driver.  Some older SoCs (pre-DT) use the
the rtc-at91rm9200 driver (e.g.  obviously the AT91RM9200) and they should
not be impacted by the change.  There shouldn't be a large volume of
interrupts associated with a RTC.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Reported-by: Douglas Gilbert <dgilbert@interlog.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Ludovic Desroches <ludovic.desroches@atmel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-03-22 16:41:20 -07:00
..
accessibility
acpi Fixes: 2013-03-12 20:25:53 -07:00
amba ARM: 7675/1: amba: tegra-ahb: Fix build error w/ PM_SLEEP w/o PM_RUNTIME 2013-03-15 17:20:02 +00:00
ata ACPI / glue: Drop .find_bridge() callback from struct acpi_bus_type 2013-03-04 14:23:40 +01:00
atm hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
auxdisplay
base ACPI and power management fixes for 3.9-rc2 2013-03-07 14:54:28 -08:00
bcma Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2013-03-01 13:52:03 -05:00
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2013-02-28 17:43:09 -08:00
bluetooth Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth 2013-03-13 13:29:56 -04:00
bus
cdrom
char Simple virtio-rng fix. 2013-03-12 20:28:45 -07:00
clk clk: vt8500: Fix "fix device clock divisor calculations" 2013-03-14 22:34:26 +01:00
clocksource ImgTec Meta architecture changes for v3.9-rc1 2013-03-03 12:06:09 -08:00
connector proc connector: reject unprivileged listener bumps 2013-02-27 13:08:35 -05:00
cpufreq cpufreq / intel_pstate: Do not load on VM that does not report max P state. 2013-03-06 23:40:11 +01:00
cpuidle arm-soc: soc-specific updates 2013-02-21 15:27:22 -08:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2013-02-25 15:56:15 -08:00
dca dca: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
devfreq
dio
dma Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2013-03-03 10:20:22 -08:00
edac Merge branch 'linux_next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-edac 2013-02-28 20:42:33 -08:00
eisa
extcon Char/Misc driver patches for 3.9-rc1 2013-02-21 13:57:13 -08:00
firewire firewire: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
firmware Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2013-03-09 16:51:13 -08:00
gpio Two patches for Device Tree on at91sam9x5/NAND. 2013-03-14 23:55:59 +01:00
gpu Merge branch 'drm-intel-fixes' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-03-21 10:17:38 +10:00
hid Merge branch 'for-3.9/upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2013-03-08 14:42:52 -08:00
hsi hsi: fix kernel-doc warnings 2013-03-01 13:39:00 -08:00
hv Drivers: hv: vmbus: Use the new infrastructure for delivering VMBUS interrupts 2013-02-27 10:15:53 -08:00
hwmon hwmon: (lm75.h) Update header inclusion 2013-03-18 21:19:49 +01:00
hwspinlock
i2c drivers/i2c: remove !S390 dependency, add missing GENERIC_HARDIRQS dependencies 2013-03-11 09:59:02 +01:00
ide Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
idle Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-02-22 19:25:09 -08:00
iio First round of iio fixes post the 3.9 merge window. 2013-03-06 05:48:24 +08:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-03-19 13:20:51 -07:00
input arm-soc: bug fixes for 3.9-rc3 2013-03-18 08:17:14 -07:00
iommu iommu, x86: Add DMA remap fault reason 2013-03-06 09:41:51 +01:00
ipack Char/Misc driver patches for 3.9-rc1 2013-02-21 13:57:13 -08:00
irqchip irqchip: fix typo when moving gic_raise_softirq() 2013-03-04 17:15:33 -08:00
isdn isdn: hisax: netjet requires VIRT_TO_BUS 2013-03-17 12:01:10 -04:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2013-02-26 09:29:02 -08:00
lguest All trivial, thanks to the stuff which didn't quite make it time. 2013-02-26 14:49:12 -08:00
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-02-23 17:09:55 -08:00
mailbox mailbox, pl320-ipc: remove __init from probe function 2013-03-04 14:23:11 +01:00
md dm cache: policy ignore hints if generated by different version 2013-03-20 17:21:28 +00:00
media arm-soc: late OMAP changes 2013-02-28 20:00:40 -08:00
memory
memstick memstick: move the dereference below the NULL test 2013-02-27 19:10:23 -08:00
message
mfd mfd: twl4030-madc: Remove __exit_p annotation 2013-03-15 07:42:22 +01:00
misc fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
mmc Merge branches 'devel-stable', 'fixes' and 'mmci' into for-linus 2013-03-03 00:32:50 +00:00
mtd MTD fixes for 3.9 2013-03-18 08:27:41 -07:00
net bnx2x: fix occasional statistics off-by-4GB error 2013-03-18 13:12:20 -04:00
nfc Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2013-02-18 13:47:13 -05:00
ntb
nubus
of Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-02-21 17:40:58 -08:00
oprofile fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
parisc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
parport Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2013-02-21 17:54:03 -08:00
pci PCI: Use ROM images from firmware only if no other ROM source available 2013-03-19 14:51:14 -07:00
pcmcia Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-02-21 17:40:58 -08:00
pinctrl ARM: at91: add gpio suspend/resume support when using pinctrl 2013-03-14 09:37:42 +01:00
platform Platform: x86: chromeos_laptop : Add basic platform data for atmel devices 2013-03-08 16:03:29 -08:00
pnp ACPI / glue: Add .match() callback to struct acpi_bus_type 2013-03-04 14:23:40 +01:00
power power: convert to idr_alloc() 2013-02-27 19:10:18 -08:00
pps drivers/pps/clients/pps-gpio.c: use devm_kzalloc 2013-02-27 19:10:23 -08:00
ps3
ptp
pwm pwm: Changes for v3.9-rc1 2013-02-26 09:34:29 -08:00
rapidio
regulator Merge remote-tracking branch 'regulator/fix/twl' into tmp 2013-03-05 10:12:43 +08:00
remoteproc remoteproc: convert to idr_alloc() 2013-02-27 19:10:18 -08:00
rpmsg rpmsg: convert to idr_alloc() 2013-02-27 19:10:18 -08:00
rtc drivers/rtc/rtc-at91rm9200.c: use a variable for storing IMR 2013-03-22 16:41:20 -07:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-03-19 13:20:51 -07:00
sbus Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
scsi ACPI / glue: Add .match() callback to struct acpi_bus_type 2013-03-04 14:23:40 +01:00
sfi
sh
sn
spi arm-soc: soc-specific updates 2013-02-21 15:27:22 -08:00
ssb Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into mips-for-linux-next 2013-02-22 10:07:30 +01:00
staging Merge branch 'akpm' (fixes from Andrew) 2013-03-13 15:21:57 -07:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-03-02 11:43:27 -08:00
tc
thermal thermal: exynos_thermal: return a proper error code while thermal_zone_device_register fail. 2013-03-11 23:09:29 +08:00
tty Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc 2013-03-19 14:47:11 -07:00
uio uio: convert to idr_alloc() 2013-02-27 19:10:19 -08:00
usb USB fixes for 3.9-rc2 2013-03-13 15:03:48 -07:00
uwb
vfio vfio: include <linux/slab.h> for kmalloc 2013-03-15 12:58:20 -06:00
vhost vhost/net: fix heads usage of ubuf_info 2013-03-17 14:28:54 -04:00
video drivers/video/ep93xx-fb.c: include <linux/io.h> for devm_ioremap() 2013-03-22 16:41:20 -07:00
virt
virtio All trivial, thanks to the stuff which didn't quite make it time. 2013-02-26 14:49:12 -08:00
vlynq
vme
w1 w1: fix oops when w1_search is called from netlink connector 2013-03-12 16:20:46 -07:00
watchdog watchdog: sp805_wdt depends on ARM 2013-03-01 12:56:26 +01:00
xen Fixes: 2013-03-12 20:25:53 -07:00
zorro new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
Kconfig Char/Misc driver patches for 3.9-rc1 2013-02-21 13:57:13 -08:00
Makefile Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-02-23 17:09:55 -08:00