2 files changed, 17 insertions, 19 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 2278b21b5eb8..e439eb77d283 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -3,7 +3,7 @@
  *
  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
- *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
+ *  Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de>
  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
  *                      - Added processor hotplug support
  *  Copyright (C) 2005  Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
@@ -264,21 +264,15 @@ static void acpi_processor_idle(void)
                 u32 bm_status = 0;
                 unsigned long diff = jiffies - pr->power.bm_check_timestamp;
 
-                if (diff > 32)
-                        diff = 32;
+                if (diff > 31)
+                        diff = 31;
 
-                while (diff) {
-                        /* if we didn't get called, assume there was busmaster activity */
-                        diff--;
-                        if (diff)
-                                pr->power.bm_activity |= 0x1;
-                        pr->power.bm_activity <<= 1;
-                }
+                pr->power.bm_activity <<= diff;
 
                 acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS,
                                   &bm_status, ACPI_MTX_DO_NOT_LOCK);
                 if (bm_status) {
-                        pr->power.bm_activity++;
+                        pr->power.bm_activity |= 0x1;
                         acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS,
                                           1, ACPI_MTX_DO_NOT_LOCK);
                 }
@@ -290,16 +284,16 @@ static void acpi_processor_idle(void)
                 else if (errata.piix4.bmisx) {
                         if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
                             || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
-                                pr->power.bm_activity++;
+                                pr->power.bm_activity |= 0x1;
                 }
 
                 pr->power.bm_check_timestamp = jiffies;
 
                 /*
-                 * Apply bus mastering demotion policy.  Automatically demote
+                 * If bus mastering is or was active this jiffy, demote
                  * to avoid a faulty transition.  Note that the processor
                  * won't enter a low-power state during this call (to this
-                 * funciton) but should upon the next.
+                 * function) but should upon the next.
                  *
                  * TBD: A better policy might be to fallback to the demotion
                  *      state (use it for this quantum only) istead of
@@ -307,7 +301,8 @@ static void acpi_processor_idle(void)
                  *      qualification.  This may, however, introduce DMA
                  *      issues (e.g. floppy DMA transfer overrun/underrun).
                  */
-                if (pr->power.bm_activity & cx->demotion.threshold.bm) {
+                if ((pr->power.bm_activity & 0x1) &&
+                    cx->demotion.threshold.bm) {
                         local_irq_enable();
                         next_state = cx->demotion.state;
                         goto end;
@@ -325,8 +320,6 @@ static void acpi_processor_idle(void)
                 cx = &pr->power.states[ACPI_STATE_C1];
 #endif
 
-        cx->usage++;
-
         /*
          * Sleep:
          * ------
@@ -435,6 +428,9 @@ static void acpi_processor_idle(void)
                 local_irq_enable();
                 return;
         }
+        cx->usage++;
+        if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
+                cx->time += sleep_ticks;
 
         next_state = pr->power.state;
 
@@ -1058,9 +1054,10 @@ static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
                 else
                         seq_puts(seq, "demotion[--] ");
 
-                seq_printf(seq, "latency[%03d] usage[%08d]\n",
+                seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
                            pr->power.states[i].latency,
-                           pr->power.states[i].usage);
+                           pr->power.states[i].usage,
+                           pr->power.states[i].time);
         }
 
       end:
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 77371b3cdc44..9dd5b75961f8 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -62,6 +62,7 @@ struct acpi_processor_cx {
         u32 latency_ticks;
         u32 power;
         u32 usage;
+        u64 time;
         struct acpi_processor_cx_policy promotion;
         struct acpi_processor_cx_policy demotion;
 };