Merge tag 'for_3.7-omap_device' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm into devel-omap-device

Updates for omap_device layer for v3.7.

Allows omap_device layer to keep track of driver bound status in order
to make more intelligent decisions about idling unused devices.

2 files changed, 53 insertions, 5 deletions

diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index 4327b2c90c3..e7259c0d33e 100644
--- a/arch/arm/plat-omap/include/plat/omap_device.h
+++ b/arch/arm/plat-omap/include/plat/omap_device.h
@@ -60,6 +60,7 @@ extern struct dev_pm_domain omap_device_pm_domain;
  * @_dev_wakeup_lat_limit: dev wakeup latency limit in nsec - set by OMAP PM
  * @_state: one of OMAP_DEVICE_STATE_* (see above)
  * @flags: device flags
+ * @_driver_status: one of BUS_NOTIFY_*_DRIVER from <linux/device.h>
  *
  * Integrates omap_hwmod data into Linux platform_device.
  *
@@ -73,6 +74,7 @@ struct omap_device {
         struct omap_device_pm_latency   *pm_lats;
         u32                             dev_wakeup_lat;
         u32                             _dev_wakeup_lat_limit;
+        unsigned long                   _driver_status;
         u8                              pm_lats_cnt;
         s8                              pm_lat_level;
         u8                              hwmods_cnt;
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index c490240bb82..0f519829e79 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -385,17 +385,21 @@ static int _omap_device_notifier_call(struct notifier_block *nb,
                                       unsigned long event, void *dev)
 {
         struct platform_device *pdev = to_platform_device(dev);
+        struct omap_device *od;
 
         switch (event) {
-        case BUS_NOTIFY_ADD_DEVICE:
-                if (pdev->dev.of_node)
-                        omap_device_build_from_dt(pdev);
-                break;
-
         case BUS_NOTIFY_DEL_DEVICE:
                 if (pdev->archdata.od)
                         omap_device_delete(pdev->archdata.od);
                 break;
+        case BUS_NOTIFY_ADD_DEVICE:
+                if (pdev->dev.of_node)
+                        omap_device_build_from_dt(pdev);
+                /* fall through */
+        default:
+                od = to_omap_device(pdev);
+                if (od)
+                        od->_driver_status = event;
         }
 
         return NOTIFY_DONE;
@@ -752,6 +756,10 @@ static int _od_suspend_noirq(struct device *dev)
         struct omap_device *od = to_omap_device(pdev);
         int ret;
 
+        /* Don't attempt late suspend on a driver that is not bound */
+        if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
+                return 0;
+
         ret = pm_generic_suspend_noirq(dev);
 
         if (!ret && !pm_runtime_status_suspended(dev)) {
@@ -1125,3 +1133,41 @@ static int __init omap_device_init(void)
         return 0;
 }
 core_initcall(omap_device_init);
+
+/**
+ * omap_device_late_idle - idle devices without drivers
+ * @dev: struct device * associated with omap_device
+ * @data: unused
+ *
+ * Check the driver bound status of this device, and idle it
+ * if there is no driver attached.
+ */
+static int __init omap_device_late_idle(struct device *dev, void *data)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct omap_device *od = to_omap_device(pdev);
+
+        if (!od)
+                return 0;
+
+        /*
+         * If omap_device state is enabled, but has no driver bound,
+         * idle it.
+         */
+        if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
+                if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
+                        dev_warn(dev, "%s: enabled but no driver.  Idling\n",
+                                 __func__);
+                        omap_device_idle(pdev);
+                }
+        }
+
+        return 0;
+}
+
+static int __init omap_device_late_init(void)
+{
+        bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
+        return 0;
+}
+late_initcall(omap_device_late_init);