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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-12-13 09:56:38 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-12-27 11:02:09 +0100 |
commit | e6d4f08a677654385869ba0c39d7c9ceec47e5c5 (patch) | |
tree | cd1c6c5287416d6cc5eb6932befe95b3a743f8a6 /drivers/mailbox | |
parent | 4ec32d9e8e5b6d6eb491eeee3938665d8a2388fa (diff) |
intel_idle: Use ACPI _CST on server systems
In many cases, especially on server systems, it is desirable to avoid
enabling C-states that have been disabled in the platform firmware
(BIOS) setup, except for C1E.
As a rule, the C-states disabled this way are not listed by ACPI
_CST, so if that is used by intel_idle along with the specific
table of C-states that it has for the given processor, the C-states
disabled through the platform firmware will not be enabled by default
by intel_idle.
Accordingly, set the use_acpi flag (introduced previously) in all
server processor profiles defined in intel_idle (so as to make it use
ACPI _CST to decide which C-states to enable by default) and set
the CPUIDLE_FLAG_ALWAYS_ENABLE flag (also introduced previously)
for C1E in all C-states tables in intel_idle that contain C1 too
(so that C1E is enabled regardless of whether or not it is listed
by ACPI _CST).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/mailbox')
0 files changed, 0 insertions, 0 deletions