From: Zhang Rui <rui.zhang@intel.com>
Date: Wed, 22 Apr 2020 15:26:07 +0800
Subject: ACPI: processor: idle: Allow probing on platforms with one ACPI
C-state
Patch-mainline: v5.8-rc1
Git-commit: 496121c02127e9c460b436244c38260b044cc45a
References: jsc#SLE-16407
It is possible for ACPI _CST to return only one ACPI C-state, for
example, when deep cstate disabled in the BIOS.
And it is better for the acpi_idle driver to probe succesfully in
this case as well for consistency.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
drivers/acpi/processor_idle.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -308,11 +308,7 @@ static int acpi_processor_get_power_info
if (ret)
return ret;
- /*
- * It is expected that there will be at least 2 states, C1 and
- * something else (C2 or C3), so fail if that is not the case.
- */
- if (pr->power.count < 2)
+ if (!pr->power.count)
return -EFAULT;
pr->flags.has_cst = 1;
@@ -468,8 +464,7 @@ static int acpi_processor_get_cstate_inf
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
if (pr->power.states[i].valid) {
pr->power.count = i;
- if (pr->power.states[i].type >= ACPI_STATE_C2)
- pr->flags.power = 1;
+ pr->flags.power = 1;
}
}