Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCH 3/4] ACPI: processor idle: Only flush cache on entering C3 | Date | Mon, 6 Dec 2021 15:29:51 +0300 |
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According to the ACPI spec v6.4, section 8.2, cache flushing required on entering C3 power state.
Avoid flushing cache on entering other power states.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- drivers/acpi/processor_idle.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 76ef1bcc8848..01495aca850e 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -567,7 +567,8 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index) { struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); - ACPI_FLUSH_CPU_CACHE(); + if (cx->type == ACPI_STATE_C3) + ACPI_FLUSH_CPU_CACHE(); while (1) { -- 2.32.0
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