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ACPI: processor: idle: Allow probing on platforms with one ACPI C-state

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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>
This commit is contained in:
Zhang Rui 2020-04-22 15:26:07 +08:00 committed by Rafael J. Wysocki
parent 6a8b55ed40
commit 496121c021
1 changed files with 2 additions and 7 deletions
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9
drivers/acpi/processor_idle.c
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@ -308,11 +308,7 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
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_info(struct acpi_processor *pr)
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;
}
}