ACPI processor: force throttling state when BIOS returns incorrect value

[pandora-kernel.git] / drivers / acpi / processor_throttling.c

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 2275437..841be4e 100644 (file)
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -62,7 +62,8 @@ struct throttling_tstate {
 #define THROTTLING_POSTCHANGE      (2)
 
 static int acpi_processor_get_throttling(struct acpi_processor *pr);
-int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
+int acpi_processor_set_throttling(struct acpi_processor *pr,
+                                               int state, bool force);
 
 static int acpi_processor_update_tsd_coord(void)
 {
@@ -361,7 +362,7 @@ int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
                 */
                target_state = throttling_limit;
        }
-       return acpi_processor_set_throttling(pr, target_state);
+       return acpi_processor_set_throttling(pr, target_state, false);
 }
 
 /*
@@ -842,7 +843,7 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
                        ACPI_WARNING((AE_INFO,
                                "Invalid throttling state, reset"));
                        state = 0;
-                       ret = acpi_processor_set_throttling(pr, state);
+                       ret = acpi_processor_set_throttling(pr, state, true);
                        if (ret)
                                return ret;
                }
@@ -915,7 +916,7 @@ static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
 }
 
 static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
-                                             int state)
+                                             int state, bool force)
 {
        u32 value = 0;
        u32 duty_mask = 0;
@@ -930,7 +931,7 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
        if (!pr->flags.throttling)
                return -ENODEV;
 
-       if (state == pr->throttling.state)
+       if (!force && (state == pr->throttling.state))
                return 0;
 
        if (state < pr->throttling_platform_limit)
@@ -988,7 +989,7 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
 }
 
 static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
-                                            int state)
+                                            int state, bool force)
 {
        int ret;
        acpi_integer value;
@@ -1002,7 +1003,7 @@ static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
        if (!pr->flags.throttling)
                return -ENODEV;
 
-       if (state == pr->throttling.state)
+       if (!force && (state == pr->throttling.state))
                return 0;
 
        if (state < pr->throttling_platform_limit)
@@ -1018,7 +1019,8 @@ static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
        return 0;
 }
 
-int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
+int acpi_processor_set_throttling(struct acpi_processor *pr,
+                                               int state, bool force)
 {
        cpumask_var_t saved_mask;
        int ret = 0;
@@ -1070,7 +1072,7 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
                /* FIXME: use work_on_cpu() */
                set_cpus_allowed_ptr(current, cpumask_of(pr->id));
                ret = p_throttling->acpi_processor_set_throttling(pr,
-                                               t_state.target_state);
+                                               t_state.target_state, force);
        } else {
                /*
                 * When the T-state coordination is SW_ALL or HW_ALL,
@@ -1103,7 +1105,7 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
                        set_cpus_allowed_ptr(current, cpumask_of(i));
                        ret = match_pr->throttling.
                                acpi_processor_set_throttling(
-                               match_pr, t_state.target_state);
+                               match_pr, t_state.target_state, force);
                }
        }
        /*
@@ -1201,7 +1203,7 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                  "Disabling throttling (was T%d)\n",
                                  pr->throttling.state));
-               result = acpi_processor_set_throttling(pr, 0);
+               result = acpi_processor_set_throttling(pr, 0, false);
                if (result)
                        goto end;
        }
@@ -1307,7 +1309,7 @@ static ssize_t acpi_processor_write_throttling(struct file *file,
        if (strcmp(tmpbuf, charp) != 0)
                return -EINVAL;
 
-       result = acpi_processor_set_throttling(pr, state_val);
+       result = acpi_processor_set_throttling(pr, state_val, false);
        if (result)
                return result;