[PATCH/RFC,1/2] OMAP: omap_device: add omap_device_has_lost_context()

Commit Message

Kevin Hilman Feb. 4, 2010, 12:19 a.m. UTC

None

Patch

diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index 76d4917..ff98eb4 100644
--- a/arch/arm/plat-omap/include/plat/omap_device.h
+++ b/arch/arm/plat-omap/include/plat/omap_device.h
@@ -71,6 +71,8 @@  struct omap_device {
 	s8				pm_lat_level;
 	u8				hwmods_cnt;
 	u8				_state;
+	u32                             activate_loss_cnt;
+	u32                             deactivate_loss_cnt;
 };
 
 /* Device driver interface (call via platform_data fn ptrs) */
@@ -78,6 +80,7 @@  struct omap_device {
 int omap_device_enable(struct platform_device *pdev);
 int omap_device_idle(struct platform_device *pdev);
 int omap_device_shutdown(struct platform_device *pdev);
+bool omap_device_has_lost_context(struct platform_device *pdev);
 
 /* Core code interface */
 
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index d8c75c8..aaa009d 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -84,6 +84,7 @@ 
 
 #include <plat/omap_device.h>
 #include <plat/omap_hwmod.h>
+#include <plat/powerdomain.h>
 
 /* These parameters are passed to _omap_device_{de,}activate() */
 #define USE_WAKEUP_LAT			0
@@ -119,6 +120,7 @@ 
 static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
 {
 	struct timespec a, b, c;
+	struct powerdomain *pwrdm;
 
 	pr_debug("omap_device: %s: activating\n", od->pdev.name);
 
@@ -168,6 +170,10 @@  static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
 		od->dev_wakeup_lat -= odpl->activate_lat;
 	}
 
+	pwrdm = omap_device_get_pwrdm(od);
+	if (pwrdm)
+		od->activate_loss_cnt = pwrdm->state_counter[PWRDM_POWER_OFF];
+
 	return 0;
 }
 
@@ -188,6 +194,7 @@  static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
 static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
 {
 	struct timespec a, b, c;
+	struct powerdomain *pwrdm;
 
 	pr_debug("omap_device: %s: deactivating\n", od->pdev.name);
 
@@ -239,6 +246,10 @@  static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
 		od->pm_lat_level++;
 	}
 
+	pwrdm = omap_device_get_pwrdm(od);
+	if (pwrdm)
+		od->deactivate_loss_cnt = pwrdm->state_counter[PWRDM_POWER_OFF];
+
 	return 0;
 }
 
@@ -560,6 +571,30 @@  int omap_device_shutdown(struct platform_device *pdev)
 }
 
 /**
+ * omap_device_has_lost_context() - check if omap_device has lost context
+ * @od: struct omap_device *
+ *
+ * When an omap_device has been deactivated via omap_device_idle() or
+ * omap_device_shutdown() and then (re)activated using omap_device_enable()
+ * This function should be used to determine if the omap_device has
+ * lost context (due to an off-mode transistion)
+ */
+bool omap_device_has_lost_context(struct platform_device *pdev)
+{
+	struct omap_device *od;
+
+	od = _find_by_pdev(pdev);
+
+	if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
+		WARN(1, "omap_device: %s.%d: has_lost_context() called "
+		     "from invalid state\n", od->pdev.name, od->pdev.id);
+		return -EINVAL;
+	}
+
+	return (od->activate_loss_cnt != od->deactivate_loss_cnt);
+}
+
+/**
  * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
  * @od: struct omap_device *
  *