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f3ec434c69
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Konstantin Shlyakhovoy f3ec434c69 drivers/rtc/rtc-twl.c: use static register while reading time 
RTC stores time and date in several registers.  Due to the fact that
these registers can't be read instantaneously, there is a chance that
reading from counting registers gives an error of one minute, one hour,
one day, etc.

To address this issue, the RTC has hardware support to copy the RTC
counting registers to static shadowed registers.  The current
implementation does not use this feature, and in a stress test, we can
reproduce this error at a rate of around two times per 300000 readings.

Fix the implementation to ensure that the right snapshot of time is
captured.

Signed-off-by: Konstantin Shlyakhovoy <x0155534@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: linux-omap <linux-omap@vger.kernel.org>
Acked-by: Mykola Oleksiienko <x0174904@ti.com>
Acked-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@ti.com>
Acked-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-12 13:12:12 -07:00
..
accessibility
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-04-06 19:56:04 -07:00
amba
ata 1) AHCI regression fix. A recent "make driver conform to spec" change 2012-03-22 20:22:30 -07:00
atm Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
auxdisplay
base regmap: A couple of small fixes for 3.4 2012-04-07 09:56:00 -07:00
bcma
block Two fixes for regressions: 2012-04-06 17:54:53 -07:00
bluetooth Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
cdrom
char drivers/char/random.c: fix boot id uniqueness race 2012-04-12 13:12:12 -07:00
clk
clocksource Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-03-29 16:53:48 -07:00
connector
cpufreq ARM: SoC fixes for 3.4-rc2 2012-04-05 22:13:39 -07:00
cpuidle Merge branches 'idle-fix' and 'misc' into release 2012-04-06 21:48:59 -04:00
crypto Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-03-22 18:15:32 -07:00
dca
devfreq ARM: global cleanups 2012-03-27 16:03:32 -07:00
dio
dma dmaengine-fixes for 3.4-rc3 2012-04-10 15:30:16 -07:00
edac Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2012-04-06 17:56:20 -07:00
eisa
firewire Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
firmware
gpio gpio: tegra: Iterate over the correct number of banks 2012-04-04 13:13:18 -06:00
gpu Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
hid simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
hsi
hv
hwmon hwmon: (ad7314) Adds missing spi_dev initialization 2012-04-03 17:08:28 -07:00
hwspinlock
i2c i2c: prevent spurious interrupt on Designware controllers 2012-04-10 08:09:03 -07:00
ide Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
idle simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
ieee802154
infiniband IB/core: Don't return EINVAL from sysfs rate attribute for invalid speeds 2012-04-02 10:57:31 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2012-03-29 23:17:44 -07:00
iommu Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-04-02 17:53:39 -07:00
leds MFD changes for 3.4 2012-03-28 13:56:35 -07:00
lguest
macintosh Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
mca
md md/raid1,raid10: don't compare excess byte during consistency check. 2012-04-03 15:39:23 +10:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-04-11 11:05:34 -07:00
memstick
message Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
mfd Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
misc Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
mmc mmc: use really long write timeout to deal with crappy cards 2012-04-05 20:32:34 -04:00
mtd Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
net Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2012-04-06 17:56:20 -07:00
nfc
nubus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
of GPIO changes for v3.4 2012-03-28 14:08:46 -07:00
oprofile simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
parisc Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
parport
pci Two fixes for regressions: 2012-04-06 17:54:53 -07:00
pcmcia Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia 2012-03-29 16:00:48 -07:00
pinctrl
platform Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-03-30 16:45:39 -07:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-03-30 16:45:39 -07:00
power Various small bugfixes and enhancements, plus two new drivers: 2012-03-30 16:09:02 -07:00
pps
ps3
ptp
rapidio
regulator regulator: Fix a build warning in the anatop driver for 3.4 2012-04-10 10:26:41 -07:00
remoteproc simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
rpmsg
rtc drivers/rtc/rtc-twl.c: use static register while reading time 2012-04-12 13:12:12 -07:00
s390 Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
sbus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
scsi Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
sfi
sh SuperH updates for 3.4 merge window 2012-03-30 00:09:17 -07:00
sn
spi Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
ssb Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-03-20 21:04:47 -07:00
staging android, lowmemorykiller: remove task handoff notifier 2012-04-09 20:48:44 -07:00
target tcm_fc: Do not free tpg structure during wq allocation failure 2012-04-06 18:57:05 -07:00
tc
thermal thermal: Fix for setting the thermal zone mode to enable/disable 2012-03-22 01:10:18 -04:00
tty SuperH updates for 3.4-rc1 2012-04-07 09:52:46 -07:00
uio
usb ARM: SoC fixes for 3.4-rc2 2012-04-05 22:13:39 -07:00
uwb simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
vhost Merge branch 'vhost-net' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost 2012-03-23 14:46:48 -04:00
video ARM: SoC fixes for 3.4-rc2 2012-04-05 22:13:39 -07:00
virt
virtio virtio-pci: switch to PM ops macro to initialise PM functions 2012-03-31 08:09:51 +05:30
vlynq
w1
watchdog ARM: cleanups of io includes 2012-03-29 18:02:10 -07:00
xen Two fixes for regressions: 2012-04-06 17:54:53 -07:00
zorro
Kconfig Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00
Makefile Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00