[ACPI] revert Embedded Controller to polling-mode by default (ala 2.6.12)

Burst mode isn't ready for prime time,
but can be enabled for test via "ec_burst=1"

Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 19 insertions, 5 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 2dadb7f63269..1ac5731d45e5 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -76,13 +76,14 @@ static int acpi_ec_remove (struct acpi_device *device, int type);
 static int acpi_ec_start (struct acpi_device *device);
 static int acpi_ec_stop (struct acpi_device *device, int type);
 static int acpi_ec_burst_add ( struct acpi_device *device);
+static int acpi_ec_polling_add ( struct acpi_device     *device);
 
 static struct acpi_driver acpi_ec_driver = {
         .name =         ACPI_EC_DRIVER_NAME,
         .class =        ACPI_EC_CLASS,
         .ids =          ACPI_EC_HID,
         .ops =          {
-                                .add =          acpi_ec_burst_add,
+                                .add =          acpi_ec_polling_add,
                                 .remove =       acpi_ec_remove,
                                 .start =        acpi_ec_start,
                                 .stop =         acpi_ec_stop,
@@ -164,7 +165,7 @@ static union acpi_ec	*ec_ecdt;
 
 /* External interfaces use first EC only, so remember */
 static struct acpi_device *first_ec;
-static int acpi_ec_polling_mode;
+static int acpi_ec_polling_mode = EC_POLLING;
 
 /* --------------------------------------------------------------------------
                              Transaction Management
@@ -1710,11 +1711,24 @@ static int __init acpi_fake_ecdt_setup(char *str)
         acpi_fake_ecdt_enabled = 1;
         return 0;
 }
+
 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
 static int __init acpi_ec_set_polling_mode(char *str)
 {
-        acpi_ec_polling_mode = EC_POLLING;
-        acpi_ec_driver.ops.add = acpi_ec_polling_add;
+        int burst;
+
+        if (!get_option(&str, &burst))
+                return 0;
+
+        if (burst) {
+                acpi_ec_polling_mode = EC_BURST;
+                acpi_ec_driver.ops.add = acpi_ec_burst_add;
+        } else {
+                acpi_ec_polling_mode = EC_POLLING;
+                acpi_ec_driver.ops.add = acpi_ec_polling_add;
+        }
+        printk(KERN_INFO PREFIX "EC %s mode.\n",
+                burst ? "burst": "polling");
         return 0;
 }
-__setup("ec_polling", acpi_ec_set_polling_mode);
+__setup("ec_burst=", acpi_ec_set_polling_mode);