diff options
| author | Len Brown <len.brown@intel.com> | 2007-07-22 02:27:40 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-07-22 02:27:40 -0400 |
| commit | f79e3185dd0f8650022518d7624c876d8929061b (patch) | |
| tree | 4cec3a434036031b4e2d4fef608f5523fb21c829 /drivers/acpi/processor_idle.c | |
| parent | e8b495fe09bc793ae26774e7b2667f7f658d56e2 (diff) | |
| parent | 8b8eb7d8cfc6cd95ed00cd58754e8493322505bd (diff) | |
Pull misc into release branch
Conflicts:
Documentation/feature-removal-schedule.txt
Diffstat (limited to 'drivers/acpi/processor_idle.c')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index bb5d23be4260..a898991f77cb 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -490,7 +490,17 @@ static void acpi_processor_idle(void) case ACPI_STATE_C3: - if (pr->flags.bm_check) { + /* + * disable bus master + * bm_check implies we need ARB_DIS + * !bm_check implies we need cache flush + * bm_control implies whether we can do ARB_DIS + * + * That leaves a case where bm_check is set and bm_control is + * not set. In that case we cannot do much, we enter C3 + * without doing anything. + */ + if (pr->flags.bm_check && pr->flags.bm_control) { if (atomic_inc_return(&c3_cpu_count) == num_online_cpus()) { /* @@ -499,7 +509,7 @@ static void acpi_processor_idle(void) */ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); } - } else { + } else if (!pr->flags.bm_check) { /* SMP with no shared cache... Invalidate cache */ ACPI_FLUSH_CPU_CACHE(); } @@ -511,7 +521,7 @@ static void acpi_processor_idle(void) acpi_cstate_enter(cx); /* Get end time (ticks) */ t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); - if (pr->flags.bm_check) { + if (pr->flags.bm_check && pr->flags.bm_control) { /* Enable bus master arbitration */ atomic_dec(&c3_cpu_count); acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); @@ -961,9 +971,9 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr, if (pr->flags.bm_check) { /* bus mastering control is necessary */ if (!pr->flags.bm_control) { + /* In this case we enter C3 without bus mastering */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "C3 support requires bus mastering control\n")); - return; + "C3 support without bus mastering control\n")); } } else { /* |