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05 April 2024, 19:05:47 UTC
Revision dfdf748a61a21b7397b9f57c83de722de71dc56a authored by Dominik Brodowski on 05 September 2008, 21:05:33 UTC, committed by Ingo Molnar on 06 September 2008, 13:33:31 UTC 
clocksource, acpi_pm.c: use proper read function also in errata mode
 
On all hardware (some Intel ICH4, PIIX4 and PIIX4E chipsets) affected by a
hardware errata there's about a 4.2% chance that initialization of the
ACPI PMTMR fails.  On those chipsets, we need to read out the timer value
at least three times to get a correct result, for every once in a while
(i.e.  within a 3 ns window every 69.8 ns) the read returns a bogus
result.  During normal operation we work around this issue, but during
initialization reading a bogus value may lead to -EINVAL even though the
hardware is usable.

Thanks to Andreas Mohr for spotting this issue.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
1 parent 4ff4b9e
History
Tip revision: dfdf748a61a21b7397b9f57c83de722de71dc56a authored by Dominik Brodowski on 05 September 2008, 21:05:33 UTC
clocksource, acpi_pm.c: use proper read function also in errata mode
Tip revision: dfdf748
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