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Merge branch 'bugzilla-15886' into release

This commit is contained in:
Len Brown 2010-07-22 18:18:28 -04:00
parent be48b11573 d3e7e99f2f
commit 4a973f2495
3 changed files with 17 additions and 2 deletions
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9
arch/x86/kernel/acpi/cstate.c
View File

@ -145,6 +145,15 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu,
percpu_entry->states[cx->index].eax = cx->address;
percpu_entry->states[cx->index].ecx = MWAIT_ECX_INTERRUPT_BREAK;
}
/*
* For _CST FFH on Intel, if GAS.access_size bit 1 is cleared,
* then we should skip checking BM_STS for this C-state.
* ref: "Intel Processor Vendor-Specific ACPI Interface Specification"
*/
if ((c->x86_vendor == X86_VENDOR_INTEL) && !(reg->access_size & 0x2))
cx->bm_sts_skip = 1;
return retval;
}
EXPORT_SYMBOL_GPL(acpi_processor_ffh_cstate_probe);

7
drivers/acpi/processor_idle.c
View File

@ -76,6 +76,8 @@ static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
module_param(max_cstate, uint, 0000);
static unsigned int nocst __read_mostly;
module_param(nocst, uint, 0000);
static int bm_check_disable __read_mostly;
module_param(bm_check_disable, uint, 0000);
static unsigned int latency_factor __read_mostly = 2;
module_param(latency_factor, uint, 0644);
@ -763,6 +765,9 @@ static int acpi_idle_bm_check(void)
{
u32 bm_status = 0;
if (bm_check_disable)
return 0;
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
if (bm_status)
acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
@ -947,7 +952,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
if (acpi_idle_suspend)
return(acpi_idle_enter_c1(dev, state));
if (acpi_idle_bm_check()) {
if (!cx->bm_sts_skip && acpi_idle_bm_check()) {
if (dev->safe_state) {
dev->last_state = dev->safe_state;
return dev->safe_state->enter(dev, dev->safe_state);

3
include/acpi/processor.h
View File

@ -48,7 +48,7 @@ struct acpi_power_register {
u8 space_id;
u8 bit_width;
u8 bit_offset;
u8 reserved;
u8 access_size;
u64 address;
} __attribute__ ((packed));
@ -63,6 +63,7 @@ struct acpi_processor_cx {
u32 power;
u32 usage;
u64 time;
u8 bm_sts_skip;
char desc[ACPI_CX_DESC_LEN];
};