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27 March 2024, 02:37:15 UTC
Revision a6d72c189f6c4292ba1a323e8af24083790529f8 authored by Len Brown on 20 January 2010, 04:10:04 UTC, committed by Len Brown on 20 January 2010, 05:54:15 UTC 
ACPI: allow C3 > 1000usec
 
Do for C3 what the previous patch did for C2.

The C2 patch was in response to a highly visible
and multiply reported C-state/turbo failure,
while this change has no bug report in-hand.

This will enable C3 in Linux on systems where BIOS
overstates C3 latency in _CST.  It will also enable
future systems which may actually have C3 > 1000usec.

Linux has always ignored ACPI BIOS C3 with exit latency > 1000 usec,
and the ACPI spec is clear that is correct FADT-supplied C3.

However, the ACPI spec explicitly states that _CST-supplied C-states
have no latency limits.

So move the 1000usec C3 test out of the code shared
by FADT and _CST code-paths, and into the FADT-specific path.

Signed-off-by: Len Brown <len.brown@intel.com>
1 parent 5d76b6f
History
Tip revision: a6d72c189f6c4292ba1a323e8af24083790529f8 authored by Len Brown on 20 January 2010, 04:10:04 UTC
ACPI: allow C3 > 1000usec
Tip revision: a6d72c1
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