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[ACPI] correct earlier SMP deep C-states on HT patch 

http://bugzilla.kernel.org/show_bug.cgi?id=5165

Change polarity of test for PLVL2_UP flag.
Skip promotion/demotion code when not needed.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
David Shaohua Li 2005-12-01 17:00:00 -05:00 committed by Len Brown
parent 4c0335526c
commit 1e48396993
1 changed files with 15 additions and 5 deletions
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20
drivers/acpi/processor_idle.c
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@ -278,8 +278,6 @@ static void acpi_processor_idle(void)
}
}
cx->usage++;
#ifdef CONFIG_HOTPLUG_CPU
/*
* Check for P_LVL2_UP flag before entering C2 and above on
@ -287,9 +285,12 @@ static void acpi_processor_idle(void)
* detection phase, to work cleanly with logical CPU hotplug.
*/
if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
!pr->flags.has_cst && acpi_fadt.plvl2_up)
cx->type = ACPI_STATE_C1;
!pr->flags.has_cst && !acpi_fadt.plvl2_up)
cx = &pr->power.states[ACPI_STATE_C1];
#endif
cx->usage++;
/*
* Sleep:
* ------
@ -378,6 +379,15 @@ static void acpi_processor_idle(void)
next_state = pr->power.state;
#ifdef CONFIG_HOTPLUG_CPU
/* Don't do promotion/demotion */
if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) &&
!pr->flags.has_cst && !acpi_fadt.plvl2_up) {
next_state = cx;
goto end;
}
#endif
/*
* Promotion?
* ----------
@ -549,7 +559,7 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
* Check for P_LVL2_UP flag before entering C2 and above on
* an SMP system.
*/
if ((num_online_cpus() > 1) && acpi_fadt.plvl2_up)
if ((num_online_cpus() > 1) && !acpi_fadt.plvl2_up)
return_VALUE(-ENODEV);
#endif