ft232: support the ASYNC_LOW_LATENCY flag

[karo-tx-linux.git] / drivers / acpi / processor_throttling.c

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 5f099012f47152ef21cb1d786598841f0b1ce56d..227543789ba91db984862f52040fc18d1a7758e9 100644 (file)
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -45,6 +45,14 @@
 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
 ACPI_MODULE_NAME("processor_throttling");
 
+/* ignore_tpc:
+ *  0 -> acpi processor driver doesn't ignore _TPC values
+ *  1 -> acpi processor driver ignores _TPC values
+ */
+static int ignore_tpc;
+module_param(ignore_tpc, int, 0644);
+MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support");
+
 struct throttling_tstate {
        unsigned int cpu;               /* cpu nr */
        int target_state;               /* target T-state */
@@ -283,6 +291,10 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 
        if (!pr)
                return -EINVAL;
+
+       if (ignore_tpc)
+               goto end;
+
        status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
        if (ACPI_FAILURE(status)) {
                if (status != AE_NOT_FOUND) {
@@ -290,6 +302,8 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
                }
                return -ENODEV;
        }
+
+end:
        pr->throttling_platform_limit = (int)tpc;
        return 0;
 }
@@ -302,6 +316,9 @@ int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
        struct acpi_processor_limit *limit;
        int target_state;
 
+       if (ignore_tpc)
+               return 0;
+
        result = acpi_processor_get_platform_limit(pr);
        if (result) {
                /* Throttling Limit is unsupported */
@@ -821,6 +838,14 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
        ret = acpi_read_throttling_status(pr, &value);
        if (ret >= 0) {
                state = acpi_get_throttling_state(pr, value);
+               if (state == -1) {
+                       ACPI_WARNING((AE_INFO,
+                               "Invalid throttling state, reset"));
+                       state = 0;
+                       ret = acpi_processor_set_throttling(pr, state);
+                       if (ret)
+                               return ret;
+               }
                pr->throttling.state = state;
        }
 
@@ -1289,7 +1314,7 @@ static ssize_t acpi_processor_write_throttling(struct file *file,
        return count;
 }
 
-struct file_operations acpi_processor_throttling_fops = {
+const struct file_operations acpi_processor_throttling_fops = {
        .owner = THIS_MODULE,
        .open = acpi_processor_throttling_open_fs,
        .read = seq_read,