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05 April 2024, 19:05:47 UTC
Revision f3ec434c69ac7f447ff6e6389c19727c9f002087 authored by Konstantin Shlyakhovoy on 12 April 2012, 19:49:15 UTC, committed by Linus Torvalds on 12 April 2012, 20:12:12 UTC 
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>
1 parent c3cba92
History
Tip revision: f3ec434c69ac7f447ff6e6389c19727c9f002087 authored by Konstantin Shlyakhovoy on 12 April 2012, 19:49:15 UTC
drivers/rtc/rtc-twl.c: use static register while reading time
Tip revision: f3ec434
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