ACPI: processor: Use _OSC to convey OSPM processor support information

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Change acpi_early_processor_osc() to return a value in case of a
failure and make it static.

Also make it run acpi_processor_osc() for every processor object or
processor device found in the ACPI Namespace (previously, its only purpose
was to work around platform firmware defects on Skylake systems).

Introduce a new function called acpi_early_processor_control_setup() that
will invoke acpi_early_processor_osc() first in order to convey the OS
processor support information to the platform firmware and if that fails,
it will fall back to using _PDC.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[ rjw: Subject and changelog edits, change function return value to bool,
  add missing 'static', change messages ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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This commit is contained in:

Michal Wilczynski 2023-07-10 17:03:36 +03:00 • committed by Rafael J. Wysocki

parent 5ba30be7fd

commit 9527264133

3 changed files with 29 additions and 20 deletions

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35

drivers/acpi/acpi_processor.c

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5

drivers/acpi/bus.c

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9

drivers/acpi/internal.h

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