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ACPI: PM: Avoid CPU cache flush when entering S4

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According to ACPI 6.4, Section 16.2, the CPU cache flushing is
required on entering to S1, S2, and S3.

No need to flush the caches during hibernation (S4).

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Kirill A. Shutemov 2021-12-06 15:29:52 +03:00 committed by Rafael J. Wysocki
parent 0fcfb00b28
commit 53d01e2016
1 changed files with 0 additions and 2 deletions
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2
drivers/acpi/sleep.c
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@ -903,8 +903,6 @@ static int acpi_hibernation_enter(void)
{ {
acpi_status status = AE_OK; acpi_status status = AE_OK;
ACPI_FLUSH_CPU_CACHE();
/* This shouldn't return. If it returns, we have a problem */ /* This shouldn't return. If it returns, we have a problem */
status = acpi_enter_sleep_state(ACPI_STATE_S4); status = acpi_enter_sleep_state(ACPI_STATE_S4);
/* Reprogram control registers */ /* Reprogram control registers */