1 files changed, 22 insertions, 7 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 0e70181f150c..73c76d646064 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1446,10 +1446,30 @@ ec_parse_io_ports(struct acpi_resource *resource, void *context)
         return AE_OK;
 }
 
-int __init acpi_boot_ec_enable(void)
+static const struct acpi_device_id ec_device_ids[] = {
+        {"PNP0C09", 0},
+        {"", 0},
+};
+
+int __init acpi_ec_dsdt_probe(void)
 {
-        if (!boot_ec)
+        acpi_status status;
+
+        if (boot_ec)
                 return 0;
+
+        /*
+         * Finding EC from DSDT if there is no ECDT EC available. When this
+         * function is invoked, ACPI tables have been fully loaded, we can
+         * walk namespace now.
+         */
+        boot_ec = make_acpi_ec();
+        if (!boot_ec)
+                return -ENOMEM;
+        status = acpi_get_devices(ec_device_ids[0].id,
+                                  ec_parse_device, boot_ec, NULL);
+        if (ACPI_FAILURE(status) || !boot_ec->handle)
+                return -ENODEV;
         if (!ec_install_handlers(boot_ec)) {
                 first_ec = boot_ec;
                 return 0;
@@ -1457,11 +1477,6 @@ int __init acpi_boot_ec_enable(void)
         return -EFAULT;
 }
 
-static const struct acpi_device_id ec_device_ids[] = {
-        {"PNP0C09", 0},
-        {"", 0},
-};
-
 #if 0
 /*
  * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not