3 files changed, 17 insertions, 2 deletions

diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index 2e837f5080fe..fb7a5f052e2b 100644
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -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);
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index b1b385692f46..1d4104855296 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -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);
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index da565a48240e..a68ca8a11a53 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -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];
 };