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| author | Len Brown <len.brown@intel.com> | 2009-05-14 17:27:38 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-05-16 01:51:51 -0400 |
| commit | 520daf7217bc1806c02eb4cfa7805447a3da2f66 (patch) | |
| tree | 12e89aeaabb6dd99d0d7f49c8e7cd88d41f77c2d /drivers | |
| parent | 091bf7624d1c90cec9e578a18529f615213ff847 (diff) | |
| download | kernel_samsung_espresso10-520daf7217bc1806c02eb4cfa7805447a3da2f66.zip kernel_samsung_espresso10-520daf7217bc1806c02eb4cfa7805447a3da2f66.tar.gz kernel_samsung_espresso10-520daf7217bc1806c02eb4cfa7805447a3da2f66.tar.bz2 | |
ACPI: idle: fix init-time TSC check regression
A previous 2.6.30 patch, a71e4917dc0ebbcb5a0ecb7ca3486643c1c9a6e2,
(ACPI: idle: mark_tsc_unstable() at init-time, not run-time)
erroneously disabled the TSC on systems that did not actually
have valid deep C-states.
Move the check after the deep-C-states are validated,
via new helper, tsc_check_state(), hich replaces tsc_halts_in_c().
Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Frans Pop <elendil@planet.nl>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index f7ca8c5..e39a40a 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -216,7 +216,7 @@ int acpi_processor_resume(struct acpi_device * device) } #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) -static int tsc_halts_in_c(int state) +static void tsc_check_state(int state) { switch (boot_cpu_data.x86_vendor) { case X86_VENDOR_AMD: @@ -226,13 +226,17 @@ static int tsc_halts_in_c(int state) * C/P/S0/S1 states when this bit is set. */ if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) - return 0; + return; /*FALL THROUGH*/ default: - return state > ACPI_STATE_C1; + /* TSC could halt in idle, so notify users */ + if (state > ACPI_STATE_C1) + mark_tsc_unstable("TSC halts in idle"); } } +#else +static void tsc_check_state(int state) { return; } #endif static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) @@ -581,11 +585,6 @@ static int acpi_processor_power_verify(struct acpi_processor *pr) for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { struct acpi_processor_cx *cx = &pr->power.states[i]; -#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) - /* TSC could halt in idle, so notify users */ - if (tsc_halts_in_c(cx->type)) - mark_tsc_unstable("TSC halts in idle");; -#endif switch (cx->type) { case ACPI_STATE_C1: cx->valid = 1; @@ -603,6 +602,8 @@ static int acpi_processor_power_verify(struct acpi_processor *pr) acpi_timer_check_state(i, pr, cx); break; } + if (cx->valid) + tsc_check_state(cx->type); if (cx->valid) working++; |