Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6

[sfrench/cifs-2.6.git] / drivers / acpi / processor_idle.c

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index f7ca8c55956bdce81732c4b0cfcf40bf82704fb6..72069ba5f1edc666d765f0131d509290e74244ab 100644 (file)
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -202,21 +202,44 @@ static void acpi_state_timer_broadcast(struct acpi_processor *pr,
  * Suspend / resume control
  */
 static int acpi_idle_suspend;
+static u32 saved_bm_rld;
+
+static void acpi_idle_bm_rld_save(void)
+{
+       acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
+}
+static void acpi_idle_bm_rld_restore(void)
+{
+       u32 resumed_bm_rld;
+
+       acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
+
+       if (resumed_bm_rld != saved_bm_rld)
+               acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
+}
 
 int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
 {
+       if (acpi_idle_suspend == 1)
+               return 0;
+
+       acpi_idle_bm_rld_save();
        acpi_idle_suspend = 1;
        return 0;
 }
 
 int acpi_processor_resume(struct acpi_device * device)
 {
+       if (acpi_idle_suspend == 0)
+               return 0;
+
+       acpi_idle_bm_rld_restore();
        acpi_idle_suspend = 0;
        return 0;
 }
 
 #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 +249,17 @@ 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)
@@ -578,14 +605,9 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
 
        pr->power.timer_broadcast_on_state = INT_MAX;
 
-       for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
+       for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; 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 +625,8 @@ 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++;