Merge tag 'omap-cleanup-b-for-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending into omap-for-v3.9/pm

Several OMAP2+ power management fixes, optimizations, and cleanup.
This series is a prerequisite for the functional powerdomain
conversion series.

Basic test logs for this branch are here:

    http://www.pwsan.com/omap/testlogs/pm_cleanup_fixes_3.9/20130129150017/

arch/arm/mach-omap2/clockdomain.c

@@ -92,8 +92,6 @@ static int _clkdm_register(struct clockdomain *clkdm)
 
 	pwrdm_add_clkdm(pwrdm, clkdm);
 
-	spin_lock_init(&clkdm->lock);
-
 	pr_debug("clockdomain: registered %s\n", clkdm->name);
 
 	return 0;
@@ -122,7 +120,7 @@ static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm,
 	return cd;
 }
 
-/*
+/**
  * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store
  * @autodep: struct clkdm_autodep * to resolve
  *
@@ -154,88 +152,206 @@ static void _autodep_lookup(struct clkdm_autodep *autodep)
 	autodep->clkdm.ptr = clkdm;
 }
 
-/*
- * _clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable
- * @clkdm: struct clockdomain *
+/**
+ * _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms
+ * @clkdm: clockdomain that we are resolving dependencies for
+ * @clkdm_deps: ptr to array of struct clkdm_deps to resolve
  *
- * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm'
- * in hardware-supervised mode.  Meant to be called from clock framework
- * when a clock inside clockdomain 'clkdm' is enabled.	No return value.
+ * Iterates through @clkdm_deps, looking up the struct clockdomain named by
+ * clkdm_name and storing the clockdomain pointer in the struct clkdm_dep.
+ * No return value.
+ */
+static void _resolve_clkdm_deps(struct clockdomain *clkdm,
+				struct clkdm_dep *clkdm_deps)
+{
+	struct clkdm_dep *cd;
+
+	for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) {
+		if (cd->clkdm)
+			continue;
+		cd->clkdm = _clkdm_lookup(cd->clkdm_name);
+
+		WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen",
+		     clkdm->name, cd->clkdm_name);
+	}
+}
+
+/**
+ * _clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1 (lockless)
+ * @clkdm1: wake this struct clockdomain * up (dependent)
+ * @clkdm2: when this struct clockdomain * wakes up (source)
  *
- * XXX autodeps are deprecated and should be removed at the earliest
- * opportunity
+ * When the clockdomain represented by @clkdm2 wakes up, wake up
+ * @clkdm1. Implemented in hardware on the OMAP, this feature is
+ * designed to reduce wakeup latency of the dependent clockdomain @clkdm1.
+ * Returns -EINVAL if presented with invalid clockdomain pointers,
+ * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon
+ * success.
  */
-void _clkdm_add_autodeps(struct clockdomain *clkdm)
+static int _clkdm_add_wkdep(struct clockdomain *clkdm1,
+			    struct clockdomain *clkdm2)
 {
-	struct clkdm_autodep *autodep;
+	struct clkdm_dep *cd;
+	int ret = 0;
 
-	if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS)
-		return;
+	if (!clkdm1 || !clkdm2)
+		return -EINVAL;
 
-	for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
-		if (IS_ERR(autodep->clkdm.ptr))
-			continue;
+	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
 
-		pr_debug("clockdomain: %s: adding %s sleepdep/wkdep\n",
-			 clkdm->name, autodep->clkdm.ptr->name);
+	if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep)
+		ret = -EINVAL;
+
+	if (ret) {
+		pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
+			 clkdm1->name, clkdm2->name);
+		return ret;
+	}
+
+	cd->wkdep_usecount++;
+	if (cd->wkdep_usecount == 1) {
+		pr_debug("clockdomain: hardware will wake up %s when %s wakes up\n",
+			 clkdm1->name, clkdm2->name);
 
-		clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr);
-		clkdm_add_wkdep(clkdm, autodep->clkdm.ptr);
+		ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2);
 	}
+
+	return ret;
 }
 
-/*
- * _clkdm_add_autodeps - remove auto sleepdeps/wkdeps from clkdm
- * @clkdm: struct clockdomain *
+/**
+ * _clkdm_del_wkdep - remove a wakeup dep from clkdm2 to clkdm1 (lockless)
+ * @clkdm1: wake this struct clockdomain * up (dependent)
+ * @clkdm2: when this struct clockdomain * wakes up (source)
  *
- * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm'
- * in hardware-supervised mode.  Meant to be called from clock framework
- * when a clock inside clockdomain 'clkdm' is disabled.  No return value.
+ * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2
+ * wakes up.  Returns -EINVAL if presented with invalid clockdomain
+ * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or
+ * 0 upon success.
+ */
+static int _clkdm_del_wkdep(struct clockdomain *clkdm1,
+			    struct clockdomain *clkdm2)
+{
+	struct clkdm_dep *cd;
+	int ret = 0;
+
+	if (!clkdm1 || !clkdm2)
+		return -EINVAL;
+
+	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
+
+	if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep)
+		ret = -EINVAL;
+
+	if (ret) {
+		pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
+			 clkdm1->name, clkdm2->name);
+		return ret;
+	}
+
+	cd->wkdep_usecount--;
+	if (cd->wkdep_usecount == 0) {
+		pr_debug("clockdomain: hardware will no longer wake up %s after %s wakes up\n",
+			 clkdm1->name, clkdm2->name);
+
+		ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2);
+	}
+
+	return ret;
+}
+
+/**
+ * _clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1 (lockless)
+ * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
+ * @clkdm2: when this struct clockdomain * is active (source)
  *
- * XXX autodeps are deprecated and should be removed at the earliest
- * opportunity
+ * Prevent @clkdm1 from automatically going inactive (and then to
+ * retention or off) if @clkdm2 is active.  Returns -EINVAL if
+ * presented with invalid clockdomain pointers or called on a machine
+ * that does not support software-configurable hardware sleep
+ * dependencies, -ENOENT if the specified dependency cannot be set in
+ * hardware, or 0 upon success.
  */
-void _clkdm_del_autodeps(struct clockdomain *clkdm)
+static int _clkdm_add_sleepdep(struct clockdomain *clkdm1,
+			       struct clockdomain *clkdm2)
 {
-	struct clkdm_autodep *autodep;
+	struct clkdm_dep *cd;
+	int ret = 0;
 
-	if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS)
-		return;
+	if (!clkdm1 || !clkdm2)
+		return -EINVAL;
 
-	for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
-		if (IS_ERR(autodep->clkdm.ptr))
-			continue;
+	cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
 
-		pr_debug("clockdomain: %s: removing %s sleepdep/wkdep\n",
-			 clkdm->name, autodep->clkdm.ptr->name);
+	if (!arch_clkdm || !arch_clkdm->clkdm_add_sleepdep)
+		ret = -EINVAL;
 
-		clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr);
-		clkdm_del_wkdep(clkdm, autodep->clkdm.ptr);
+	if (ret) {
+		pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n",
+			 clkdm1->name, clkdm2->name);
+		return ret;
+	}
+
+	cd->sleepdep_usecount++;
+	if (cd->sleepdep_usecount == 1) {
+		pr_debug("clockdomain: will prevent %s from sleeping if %s is active\n",
+			 clkdm1->name, clkdm2->name);
+
+		ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2);
 	}
+
+	return ret;
 }
 
 /**
- * _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms
- * @clkdm: clockdomain that we are resolving dependencies for
- * @clkdm_deps: ptr to array of struct clkdm_deps to resolve
+ * _clkdm_del_sleepdep - remove a sleep dep from clkdm2 to clkdm1 (lockless)
+ * @clkdm1: prevent this struct clockdomain * from sleeping (dependent)
+ * @clkdm2: when this struct clockdomain * is active (source)
  *
- * Iterates through @clkdm_deps, looking up the struct clockdomain named by
- * clkdm_name and storing the clockdomain pointer in the struct clkdm_dep.
- * No return value.
+ * Allow @clkdm1 to automatically go inactive (and then to retention or
+ * off), independent of the activity state of @clkdm2.  Returns -EINVAL
+ * if presented with invalid clockdomain pointers or called on a machine
+ * that does not support software-configurable hardware sleep dependencies,
+ * -ENOENT if the specified dependency cannot be cleared in hardware, or
+ * 0 upon success.
  */
-static void _resolve_clkdm_deps(struct clockdomain *clkdm,
-				struct clkdm_dep *clkdm_deps)
+static int _clkdm_del_sleepdep(struct clockdomain *clkdm1,
+			       struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
+	int ret = 0;
 
-	for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) {
-		if (cd->clkdm)
-			continue;
-		cd->clkdm = _clkdm_lookup(cd->clkdm_name);
+	if (!clkdm1 || !clkdm2)
+		return -EINVAL;
 
-		WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen",
-		     clkdm->name, cd->clkdm_name);
+	cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
+
+	if (!arch_clkdm || !arch_clkdm->clkdm_del_sleepdep)
+		ret = -EINVAL;
+
+	if (ret) {
+		pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n",
+			 clkdm1->name, clkdm2->name);
+		return ret;
 	}
+
+	cd->sleepdep_usecount--;
+	if (cd->sleepdep_usecount == 0) {
+		pr_debug("clockdomain: will no longer prevent %s from sleeping if %s is active\n",
+			 clkdm1->name, clkdm2->name);
+
+		ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2);
+	}
+
+	return ret;
 }
 
 /* Public functions */
@@ -456,30 +572,18 @@ struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm)
 int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
-	int ret = 0;
+	int ret;
 
 	if (!clkdm1 || !clkdm2)
 		return -EINVAL;
 
 	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
 	if (IS_ERR(cd))
-		ret = PTR_ERR(cd);
+		return PTR_ERR(cd);
 
-	if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep)
-		ret = -EINVAL;
-
-	if (ret) {
-		pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
-			 clkdm1->name, clkdm2->name);
-		return ret;
-	}
-
-	if (atomic_inc_return(&cd->wkdep_usecount) == 1) {
-		pr_debug("clockdomain: hardware will wake up %s when %s wakes up\n",
-			 clkdm1->name, clkdm2->name);
-
-		ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2);
-	}
+	pwrdm_lock(cd->clkdm->pwrdm.ptr);
+	ret = _clkdm_add_wkdep(clkdm1, clkdm2);
+	pwrdm_unlock(cd->clkdm->pwrdm.ptr);
 
 	return ret;
 }
@@ -497,30 +601,18 @@ int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
-	int ret = 0;
+	int ret;
 
 	if (!clkdm1 || !clkdm2)
 		return -EINVAL;
 
 	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
 	if (IS_ERR(cd))
-		ret = PTR_ERR(cd);
+		return PTR_ERR(cd);
 
-	if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep)
-		ret = -EINVAL;
-
-	if (ret) {
-		pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
-			 clkdm1->name, clkdm2->name);
-		return ret;
-	}
-
-	if (atomic_dec_return(&cd->wkdep_usecount) == 0) {
-		pr_debug("clockdomain: hardware will no longer wake up %s after %s wakes up\n",
-			 clkdm1->name, clkdm2->name);
-
-		ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2);
-	}
+	pwrdm_lock(cd->clkdm->pwrdm.ptr);
+	ret = _clkdm_del_wkdep(clkdm1, clkdm2);
+	pwrdm_unlock(cd->clkdm->pwrdm.ptr);
 
 	return ret;
 }
@@ -560,7 +652,7 @@ int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 		return ret;
 	}
 
-	/* XXX It's faster to return the atomic wkdep_usecount */
+	/* XXX It's faster to return the wkdep_usecount */
 	return arch_clkdm->clkdm_read_wkdep(clkdm1, clkdm2);
 }
 
@@ -600,30 +692,18 @@ int clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
 int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
-	int ret = 0;
+	int ret;
 
 	if (!clkdm1 || !clkdm2)
 		return -EINVAL;
 
-	cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
 	if (IS_ERR(cd))
-		ret = PTR_ERR(cd);
+		return PTR_ERR(cd);
 
-	if (!arch_clkdm || !arch_clkdm->clkdm_add_sleepdep)
-		ret = -EINVAL;
-
-	if (ret) {
-		pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n",
-			 clkdm1->name, clkdm2->name);
-		return ret;
-	}
-
-	if (atomic_inc_return(&cd->sleepdep_usecount) == 1) {
-		pr_debug("clockdomain: will prevent %s from sleeping if %s is active\n",
-			 clkdm1->name, clkdm2->name);
-
-		ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2);
-	}
+	pwrdm_lock(cd->clkdm->pwrdm.ptr);
+	ret = _clkdm_add_sleepdep(clkdm1, clkdm2);
+	pwrdm_unlock(cd->clkdm->pwrdm.ptr);
 
 	return ret;
 }
@@ -643,30 +723,18 @@ int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
-	int ret = 0;
+	int ret;
 
 	if (!clkdm1 || !clkdm2)
 		return -EINVAL;
 
-	cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
+	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
 	if (IS_ERR(cd))
-		ret = PTR_ERR(cd);
+		return PTR_ERR(cd);
 
-	if (!arch_clkdm || !arch_clkdm->clkdm_del_sleepdep)
-		ret = -EINVAL;
-
-	if (ret) {
-		pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n",
-			 clkdm1->name, clkdm2->name);
-		return ret;
-	}
-
-	if (atomic_dec_return(&cd->sleepdep_usecount) == 0) {
-		pr_debug("clockdomain: will no longer prevent %s from sleeping if %s is active\n",
-			 clkdm1->name, clkdm2->name);
-
-		ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2);
-	}
+	pwrdm_lock(cd->clkdm->pwrdm.ptr);
+	ret = _clkdm_del_sleepdep(clkdm1, clkdm2);
+	pwrdm_unlock(cd->clkdm->pwrdm.ptr);
 
 	return ret;
 }
@@ -708,7 +776,7 @@ int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 		return ret;
 	}
 
-	/* XXX It's faster to return the atomic sleepdep_usecount */
+	/* XXX It's faster to return the sleepdep_usecount */
 	return arch_clkdm->clkdm_read_sleepdep(clkdm1, clkdm2);
 }
 
@@ -734,18 +802,17 @@ int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm)
 }
 
 /**
- * clkdm_sleep - force clockdomain sleep transition
+ * clkdm_sleep_nolock - force clockdomain sleep transition (lockless)
  * @clkdm: struct clockdomain *
  *
  * Instruct the CM to force a sleep transition on the specified
- * clockdomain @clkdm.  Returns -EINVAL if @clkdm is NULL or if
- * clockdomain does not support software-initiated sleep; 0 upon
- * success.
+ * clockdomain @clkdm.  Only for use by the powerdomain code.  Returns
+ * -EINVAL if @clkdm is NULL or if clockdomain does not support
+ * software-initiated sleep; 0 upon success.
  */
-int clkdm_sleep(struct clockdomain *clkdm)
+int clkdm_sleep_nolock(struct clockdomain *clkdm)
 {
 	int ret;
-	unsigned long flags;
 
 	if (!clkdm)
 		return -EINVAL;
@@ -761,26 +828,45 @@ int clkdm_sleep(struct clockdomain *clkdm)
 
 	pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name);
 
-	spin_lock_irqsave(&clkdm->lock, flags);
 	clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
 	ret = arch_clkdm->clkdm_sleep(clkdm);
-	spin_unlock_irqrestore(&clkdm->lock, flags);
+	ret |= pwrdm_state_switch_nolock(clkdm->pwrdm.ptr);
+
 	return ret;
 }
 
 /**
- * clkdm_wakeup - force clockdomain wakeup transition
+ * clkdm_sleep - force clockdomain sleep transition
  * @clkdm: struct clockdomain *
  *
- * Instruct the CM to force a wakeup transition on the specified
- * clockdomain @clkdm.  Returns -EINVAL if @clkdm is NULL or if the
- * clockdomain does not support software-controlled wakeup; 0 upon
+ * Instruct the CM to force a sleep transition on the specified
+ * clockdomain @clkdm.  Returns -EINVAL if @clkdm is NULL or if
+ * clockdomain does not support software-initiated sleep; 0 upon
  * success.
  */
-int clkdm_wakeup(struct clockdomain *clkdm)
+int clkdm_sleep(struct clockdomain *clkdm)
+{
+	int ret;
+
+	pwrdm_lock(clkdm->pwrdm.ptr);
+	ret = clkdm_sleep_nolock(clkdm);
+	pwrdm_unlock(clkdm->pwrdm.ptr);
+
+	return ret;
+}
+
+/**
+ * clkdm_wakeup_nolock - force clockdomain wakeup transition (lockless)
+ * @clkdm: struct clockdomain *
+ *
+ * Instruct the CM to force a wakeup transition on the specified
+ * clockdomain @clkdm.  Only for use by the powerdomain code.  Returns
+ * -EINVAL if @clkdm is NULL or if the clockdomain does not support
+ * software-controlled wakeup; 0 upon success.
+ */
+int clkdm_wakeup_nolock(struct clockdomain *clkdm)
 {
 	int ret;
-	unsigned long flags;
 
 	if (!clkdm)
 		return -EINVAL;
@@ -796,28 +882,46 @@ int clkdm_wakeup(struct clockdomain *clkdm)
 
 	pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name);
 
-	spin_lock_irqsave(&clkdm->lock, flags);
 	clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
 	ret = arch_clkdm->clkdm_wakeup(clkdm);
-	ret |= pwrdm_state_switch(clkdm->pwrdm.ptr);
-	spin_unlock_irqrestore(&clkdm->lock, flags);
+	ret |= pwrdm_state_switch_nolock(clkdm->pwrdm.ptr);
+
 	return ret;
 }
 
 /**
- * clkdm_allow_idle - enable hwsup idle transitions for clkdm
+ * clkdm_wakeup - force clockdomain wakeup transition
  * @clkdm: struct clockdomain *
  *
- * Allow the hardware to automatically switch the clockdomain @clkdm into
- * active or idle states, as needed by downstream clocks.  If the
+ * Instruct the CM to force a wakeup transition on the specified
+ * clockdomain @clkdm.  Returns -EINVAL if @clkdm is NULL or if the
+ * clockdomain does not support software-controlled wakeup; 0 upon
+ * success.
+ */
+int clkdm_wakeup(struct clockdomain *clkdm)
+{
+	int ret;
+
+	pwrdm_lock(clkdm->pwrdm.ptr);
+	ret = clkdm_wakeup_nolock(clkdm);
+	pwrdm_unlock(clkdm->pwrdm.ptr);
+
+	return ret;
+}
+
+/**
+ * clkdm_allow_idle_nolock - enable hwsup idle transitions for clkdm
+ * @clkdm: struct clockdomain *
+ *
+ * Allow the hardware to automatically switch the clockdomain @clkdm
+ * into active or idle states, as needed by downstream clocks.  If the
  * clockdomain has any downstream clocks enabled in the clock
  * framework, wkdep/sleepdep autodependencies are added; this is so
- * device drivers can read and write to the device.  No return value.
+ * device drivers can read and write to the device.  Only for use by
+ * the powerdomain code.  No return value.
  */
-void clkdm_allow_idle(struct clockdomain *clkdm)
+void clkdm_allow_idle_nolock(struct clockdomain *clkdm)
 {
-	unsigned long flags;
-
 	if (!clkdm)
 		return;
 
@@ -833,11 +937,26 @@ void clkdm_allow_idle(struct clockdomain *clkdm)
 	pr_debug("clockdomain: enabling automatic idle transitions for %s\n",
 		 clkdm->name);
 
-	spin_lock_irqsave(&clkdm->lock, flags);
 	clkdm->_flags |= _CLKDM_FLAG_HWSUP_ENABLED;
 	arch_clkdm->clkdm_allow_idle(clkdm);
-	pwrdm_state_switch(clkdm->pwrdm.ptr);
-	spin_unlock_irqrestore(&clkdm->lock, flags);
+	pwrdm_state_switch_nolock(clkdm->pwrdm.ptr);
+}
+
+/**
+ * clkdm_allow_idle - enable hwsup idle transitions for clkdm
+ * @clkdm: struct clockdomain *
+ *
+ * Allow the hardware to automatically switch the clockdomain @clkdm into
+ * active or idle states, as needed by downstream clocks.  If the
+ * clockdomain has any downstream clocks enabled in the clock
+ * framework, wkdep/sleepdep autodependencies are added; this is so
+ * device drivers can read and write to the device.  No return value.
+ */
+void clkdm_allow_idle(struct clockdomain *clkdm)
+{
+	pwrdm_lock(clkdm->pwrdm.ptr);
+	clkdm_allow_idle_nolock(clkdm);
+	pwrdm_unlock(clkdm->pwrdm.ptr);
 }
 
 /**
@@ -847,12 +966,11 @@ void clkdm_allow_idle(struct clockdomain *clkdm)
  * Prevent the hardware from automatically switching the clockdomain
  * @clkdm into inactive or idle states.  If the clockdomain has
  * downstream clocks enabled in the clock framework, wkdep/sleepdep
- * autodependencies are removed.  No return value.
+ * autodependencies are removed.  Only for use by the powerdomain
+ * code.  No return value.
  */
-void clkdm_deny_idle(struct clockdomain *clkdm)
+void clkdm_deny_idle_nolock(struct clockdomain *clkdm)
 {
-	unsigned long flags;
-
 	if (!clkdm)
 		return;
 
@@ -868,11 +986,25 @@ void clkdm_deny_idle(struct clockdomain *clkdm)
 	pr_debug("clockdomain: disabling automatic idle transitions for %s\n",
 		 clkdm->name);
 
-	spin_lock_irqsave(&clkdm->lock, flags);
 	clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED;
 	arch_clkdm->clkdm_deny_idle(clkdm);
-	pwrdm_state_switch(clkdm->pwrdm.ptr);
-	spin_unlock_irqrestore(&clkdm->lock, flags);
+	pwrdm_state_switch_nolock(clkdm->pwrdm.ptr);
+}
+
+/**
+ * clkdm_deny_idle - disable hwsup idle transitions for clkdm
+ * @clkdm: struct clockdomain *
+ *
+ * Prevent the hardware from automatically switching the clockdomain
+ * @clkdm into inactive or idle states.  If the clockdomain has
+ * downstream clocks enabled in the clock framework, wkdep/sleepdep
+ * autodependencies are removed.  No return value.
+ */
+void clkdm_deny_idle(struct clockdomain *clkdm)
+{
+	pwrdm_lock(clkdm->pwrdm.ptr);
+	clkdm_deny_idle_nolock(clkdm);
+	pwrdm_unlock(clkdm->pwrdm.ptr);
 }
 
 /**
@@ -889,14 +1021,11 @@ void clkdm_deny_idle(struct clockdomain *clkdm)
 bool clkdm_in_hwsup(struct clockdomain *clkdm)
 {
 	bool ret;
-	unsigned long flags;
 
 	if (!clkdm)
 		return false;
 
-	spin_lock_irqsave(&clkdm->lock, flags);
 	ret = (clkdm->_flags & _CLKDM_FLAG_HWSUP_ENABLED) ? true : false;
-	spin_unlock_irqrestore(&clkdm->lock, flags);
 
 	return ret;
 }
@@ -918,30 +1047,91 @@ bool clkdm_missing_idle_reporting(struct clockdomain *clkdm)
 	return (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) ? true : false;
 }
 
+/* Public autodep handling functions (deprecated) */
+
+/**
+ * clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable
+ * @clkdm: struct clockdomain *
+ *
+ * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm'
+ * in hardware-supervised mode.  Meant to be called from clock framework
+ * when a clock inside clockdomain 'clkdm' is enabled.	No return value.
+ *
+ * XXX autodeps are deprecated and should be removed at the earliest
+ * opportunity
+ */
+void clkdm_add_autodeps(struct clockdomain *clkdm)
+{
+	struct clkdm_autodep *autodep;
+
+	if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS)
+		return;
+
+	for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
+		if (IS_ERR(autodep->clkdm.ptr))
+			continue;
+
+		pr_debug("clockdomain: %s: adding %s sleepdep/wkdep\n",
+			 clkdm->name, autodep->clkdm.ptr->name);
+
+		_clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr);
+		_clkdm_add_wkdep(clkdm, autodep->clkdm.ptr);
+	}
+}
+
+/**
+ * clkdm_del_autodeps - remove auto sleepdeps/wkdeps from clkdm
+ * @clkdm: struct clockdomain *
+ *
+ * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm'
+ * in hardware-supervised mode.  Meant to be called from clock framework
+ * when a clock inside clockdomain 'clkdm' is disabled.  No return value.
+ *
+ * XXX autodeps are deprecated and should be removed at the earliest
+ * opportunity
+ */
+void clkdm_del_autodeps(struct clockdomain *clkdm)
+{
+	struct clkdm_autodep *autodep;
+
+	if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS)
+		return;
+
+	for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
+		if (IS_ERR(autodep->clkdm.ptr))
+			continue;
+
+		pr_debug("clockdomain: %s: removing %s sleepdep/wkdep\n",
+			 clkdm->name, autodep->clkdm.ptr->name);
+
+		_clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr);
+		_clkdm_del_wkdep(clkdm, autodep->clkdm.ptr);
+	}
+}
+
 /* Clockdomain-to-clock/hwmod framework interface code */
 
 static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm)
 {
-	unsigned long flags;
-
 	if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_enable)
 		return -EINVAL;
 
-	spin_lock_irqsave(&clkdm->lock, flags);
+	pwrdm_lock(clkdm->pwrdm.ptr);
 
 	/*
 	 * For arch's with no autodeps, clkcm_clk_enable
 	 * should be called for every clock instance or hwmod that is
 	 * enabled, so the clkdm can be force woken up.
 	 */
-	if ((atomic_inc_return(&clkdm->usecount) > 1) && autodeps) {
-		spin_unlock_irqrestore(&clkdm->lock, flags);
+	clkdm->usecount++;
+	if (clkdm->usecount > 1 && autodeps) {
+		pwrdm_unlock(clkdm->pwrdm.ptr);
 		return 0;
 	}
 
 	arch_clkdm->clkdm_clk_enable(clkdm);
-	pwrdm_state_switch(clkdm->pwrdm.ptr);
-	spin_unlock_irqrestore(&clkdm->lock, flags);
+	pwrdm_state_switch_nolock(clkdm->pwrdm.ptr);
+	pwrdm_unlock(clkdm->pwrdm.ptr);
 
 	pr_debug("clockdomain: %s: enabled\n", clkdm->name);
 
@@ -990,36 +1180,34 @@ int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
  */
 int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk)
 {
-	unsigned long flags;
-
 	if (!clkdm || !clk || !arch_clkdm || !arch_clkdm->clkdm_clk_disable)
 		return -EINVAL;
 
-	spin_lock_irqsave(&clkdm->lock, flags);
+	pwrdm_lock(clkdm->pwrdm.ptr);
 
 	/* corner case: disabling unused clocks */
-	if ((__clk_get_enable_count(clk) == 0) &&
-	    (atomic_read(&clkdm->usecount) == 0))
+	if ((__clk_get_enable_count(clk) == 0) && clkdm->usecount == 0)
 		goto ccd_exit;
 
-	if (atomic_read(&clkdm->usecount) == 0) {
-		spin_unlock_irqrestore(&clkdm->lock, flags);
+	if (clkdm->usecount == 0) {
+		pwrdm_unlock(clkdm->pwrdm.ptr);
 		WARN_ON(1); /* underflow */
 		return -ERANGE;
 	}
 
-	if (atomic_dec_return(&clkdm->usecount) > 0) {
-		spin_unlock_irqrestore(&clkdm->lock, flags);
+	clkdm->usecount--;
+	if (clkdm->usecount > 0) {
+		pwrdm_unlock(clkdm->pwrdm.ptr);
 		return 0;
 	}
 
 	arch_clkdm->clkdm_clk_disable(clkdm);
-	pwrdm_state_switch(clkdm->pwrdm.ptr);
+	pwrdm_state_switch_nolock(clkdm->pwrdm.ptr);
 
 	pr_debug("clockdomain: %s: disabled\n", clkdm->name);
 
 ccd_exit:
-	spin_unlock_irqrestore(&clkdm->lock, flags);
+	pwrdm_unlock(clkdm->pwrdm.ptr);
 
 	return 0;
 }
@@ -1072,8 +1260,6 @@ int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh)
  */
 int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh)
 {
-	unsigned long flags;
-
 	/* The clkdm attribute does not exist yet prior OMAP4 */
 	if (cpu_is_omap24xx() || cpu_is_omap34xx())
 		return 0;
@@ -1086,22 +1272,23 @@ int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh)
 	if (!clkdm || !oh || !arch_clkdm || !arch_clkdm->clkdm_clk_disable)
 		return -EINVAL;
 
-	spin_lock_irqsave(&clkdm->lock, flags);
+	pwrdm_lock(clkdm->pwrdm.ptr);
 
-	if (atomic_read(&clkdm->usecount) == 0) {
-		spin_unlock_irqrestore(&clkdm->lock, flags);
+	if (clkdm->usecount == 0) {
+		pwrdm_unlock(clkdm->pwrdm.ptr);
 		WARN_ON(1); /* underflow */
 		return -ERANGE;
 	}
 
-	if (atomic_dec_return(&clkdm->usecount) > 0) {
-		spin_unlock_irqrestore(&clkdm->lock, flags);
+	clkdm->usecount--;
+	if (clkdm->usecount > 0) {
+		pwrdm_unlock(clkdm->pwrdm.ptr);
 		return 0;
 	}
 
 	arch_clkdm->clkdm_clk_disable(clkdm);
-	pwrdm_state_switch(clkdm->pwrdm.ptr);
-	spin_unlock_irqrestore(&clkdm->lock, flags);
+	pwrdm_state_switch_nolock(clkdm->pwrdm.ptr);
+	pwrdm_unlock(clkdm->pwrdm.ptr);
 
 	pr_debug("clockdomain: %s: disabled\n", clkdm->name);
 

arch/arm/mach-omap2/clockdomain.h

@@ -15,7 +15,6 @@
 #define __ARCH_ARM_MACH_OMAP2_CLOCKDOMAIN_H
 
 #include <linux/init.h>
-#include <linux/spinlock.h>
 
 #include "powerdomain.h"
 #include "clock.h"
@@ -92,8 +91,8 @@ struct clkdm_autodep {
 struct clkdm_dep {
 	const char *clkdm_name;
 	struct clockdomain *clkdm;
-	atomic_t wkdep_usecount;
-	atomic_t sleepdep_usecount;
+	s16 wkdep_usecount;
+	s16 sleepdep_usecount;
 };
 
 /* Possible flags for struct clockdomain._flags */
@@ -137,9 +136,8 @@ struct clockdomain {
 	const u16 clkdm_offs;
 	struct clkdm_dep *wkdep_srcs;
 	struct clkdm_dep *sleepdep_srcs;
-	atomic_t usecount;
+	int usecount;
 	struct list_head node;
-	spinlock_t lock;
 };
 
 /**
@@ -196,12 +194,16 @@ int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2);
 int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);
 
+void clkdm_allow_idle_nolock(struct clockdomain *clkdm);
 void clkdm_allow_idle(struct clockdomain *clkdm);
+void clkdm_deny_idle_nolock(struct clockdomain *clkdm);
 void clkdm_deny_idle(struct clockdomain *clkdm);
 bool clkdm_in_hwsup(struct clockdomain *clkdm);
 bool clkdm_missing_idle_reporting(struct clockdomain *clkdm);
 
+int clkdm_wakeup_nolock(struct clockdomain *clkdm);
 int clkdm_wakeup(struct clockdomain *clkdm);
+int clkdm_sleep_nolock(struct clockdomain *clkdm);
 int clkdm_sleep(struct clockdomain *clkdm);
 
 int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
@@ -214,8 +216,9 @@ extern void __init omap243x_clockdomains_init(void);
 extern void __init omap3xxx_clockdomains_init(void);
 extern void __init am33xx_clockdomains_init(void);
 extern void __init omap44xx_clockdomains_init(void);
-extern void _clkdm_add_autodeps(struct clockdomain *clkdm);
-extern void _clkdm_del_autodeps(struct clockdomain *clkdm);
+
+extern void clkdm_add_autodeps(struct clockdomain *clkdm);
+extern void clkdm_del_autodeps(struct clockdomain *clkdm);
 
 extern struct clkdm_ops omap2_clkdm_operations;
 extern struct clkdm_ops omap3_clkdm_operations;

arch/arm/mach-omap2/cm2xxx.c

@@ -273,9 +273,6 @@ int omap2xxx_cm_wait_module_ready(s16 prcm_mod, u8 idlest_id, u8 idlest_shift)
 
 static void omap2xxx_clkdm_allow_idle(struct clockdomain *clkdm)
 {
-	if (atomic_read(&clkdm->usecount) > 0)
-		_clkdm_add_autodeps(clkdm);
-
 	omap2xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 				       clkdm->clktrctrl_mask);
 }
@@ -284,9 +281,6 @@ static void omap2xxx_clkdm_deny_idle(struct clockdomain *clkdm)
 {
 	omap2xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 					clkdm->clktrctrl_mask);
-
-	if (atomic_read(&clkdm->usecount) > 0)
-		_clkdm_del_autodeps(clkdm);
 }
 
 static int omap2xxx_clkdm_clk_enable(struct clockdomain *clkdm)
@@ -298,18 +292,8 @@ static int omap2xxx_clkdm_clk_enable(struct clockdomain *clkdm)
 
 	hwsup = omap2xxx_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 					      clkdm->clktrctrl_mask);
-
-	if (hwsup) {
-		/* Disable HW transitions when we are changing deps */
-		omap2xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
-						clkdm->clktrctrl_mask);
-		_clkdm_add_autodeps(clkdm);
-		omap2xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
-					       clkdm->clktrctrl_mask);
-	} else {
-		if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
-			omap2xxx_clkdm_wakeup(clkdm);
-	}
+	if (!hwsup && clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
+		omap2xxx_clkdm_wakeup(clkdm);
 
 	return 0;
 }
@@ -324,17 +308,8 @@ static int omap2xxx_clkdm_clk_disable(struct clockdomain *clkdm)
 	hwsup = omap2xxx_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 					      clkdm->clktrctrl_mask);
 
-	if (hwsup) {
-		/* Disable HW transitions when we are changing deps */
-		omap2xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
-						clkdm->clktrctrl_mask);
-		_clkdm_del_autodeps(clkdm);
-		omap2xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
-					       clkdm->clktrctrl_mask);
-	} else {
-		if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP)
-			omap2xxx_clkdm_sleep(clkdm);
-	}
+	if (!hwsup && clkdm->flags & CLKDM_CAN_FORCE_SLEEP)
+		omap2xxx_clkdm_sleep(clkdm);
 
 	return 0;
 }

arch/arm/mach-omap2/cm3xxx.c

@@ -186,7 +186,7 @@ static int omap3xxx_clkdm_clear_all_sleepdeps(struct clockdomain *clkdm)
 			continue; /* only happens if data is erroneous */
 
 		mask |= 1 << cd->clkdm->dep_bit;
-		atomic_set(&cd->sleepdep_usecount, 0);
+		cd->sleepdep_usecount = 0;
 	}
 	omap2_cm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
 				    OMAP3430_CM_SLEEPDEP);
@@ -209,8 +209,8 @@ static int omap3xxx_clkdm_wakeup(struct clockdomain *clkdm)
 
 static void omap3xxx_clkdm_allow_idle(struct clockdomain *clkdm)
 {
-	if (atomic_read(&clkdm->usecount) > 0)
-		_clkdm_add_autodeps(clkdm);
+	if (clkdm->usecount > 0)
+		clkdm_add_autodeps(clkdm);
 
 	omap3xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 				       clkdm->clktrctrl_mask);
@@ -221,8 +221,8 @@ static void omap3xxx_clkdm_deny_idle(struct clockdomain *clkdm)
 	omap3xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 					clkdm->clktrctrl_mask);
 
-	if (atomic_read(&clkdm->usecount) > 0)
-		_clkdm_del_autodeps(clkdm);
+	if (clkdm->usecount > 0)
+		clkdm_del_autodeps(clkdm);
 }
 
 static int omap3xxx_clkdm_clk_enable(struct clockdomain *clkdm)
@@ -250,7 +250,7 @@ static int omap3xxx_clkdm_clk_enable(struct clockdomain *clkdm)
 		/* Disable HW transitions when we are changing deps */
 		omap3xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 						clkdm->clktrctrl_mask);
-		_clkdm_add_autodeps(clkdm);
+		clkdm_add_autodeps(clkdm);
 		omap3xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 					       clkdm->clktrctrl_mask);
 	} else {
@@ -287,7 +287,7 @@ static int omap3xxx_clkdm_clk_disable(struct clockdomain *clkdm)
 		/* Disable HW transitions when we are changing deps */
 		omap3xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 						clkdm->clktrctrl_mask);
-		_clkdm_del_autodeps(clkdm);
+		clkdm_del_autodeps(clkdm);
 		omap3xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
 					       clkdm->clktrctrl_mask);
 	} else {

arch/arm/mach-omap2/cminst44xx.c

@@ -393,7 +393,7 @@ static int omap4_clkdm_clear_all_wkup_sleep_deps(struct clockdomain *clkdm)
 			continue; /* only happens if data is erroneous */
 
 		mask |= 1 << cd->clkdm->dep_bit;
-		atomic_set(&cd->wkdep_usecount, 0);
+		cd->wkdep_usecount = 0;
 	}
 
 	omap4_cminst_clear_inst_reg_bits(mask, clkdm->prcm_partition,

arch/arm/mach-omap2/cpuidle34xx.c

@@ -36,40 +36,66 @@
 
 /* Mach specific information to be recorded in the C-state driver_data */
 struct omap3_idle_statedata {
-	u32 mpu_state;
-	u32 core_state;
+	u8 mpu_state;
+	u8 core_state;
+	u8 per_min_state;
+	u8 flags;
 };
 
 static struct powerdomain *mpu_pd, *core_pd, *per_pd, *cam_pd;
 
+/*
+ * Possible flag bits for struct omap3_idle_statedata.flags:
+ *
+ * OMAP_CPUIDLE_CX_NO_CLKDM_IDLE: don't allow the MPU clockdomain to go
+ *    inactive.  This in turn prevents the MPU DPLL from entering autoidle
+ *    mode, so wakeup latency is greatly reduced, at the cost of additional
+ *    energy consumption.  This also prevents the CORE clockdomain from
+ *    entering idle.
+ */
+#define OMAP_CPUIDLE_CX_NO_CLKDM_IDLE		BIT(0)
+
+/*
+ * Prevent PER OFF if CORE is not in RETention or OFF as this would
+ * disable PER wakeups completely.
+ */
 static struct omap3_idle_statedata omap3_idle_data[] = {
 	{
 		.mpu_state = PWRDM_POWER_ON,
 		.core_state = PWRDM_POWER_ON,
+		/* In C1 do not allow PER state lower than CORE state */
+		.per_min_state = PWRDM_POWER_ON,
+		.flags = OMAP_CPUIDLE_CX_NO_CLKDM_IDLE,
 	},
 	{
 		.mpu_state = PWRDM_POWER_ON,
 		.core_state = PWRDM_POWER_ON,
+		.per_min_state = PWRDM_POWER_RET,
 	},
 	{
 		.mpu_state = PWRDM_POWER_RET,
 		.core_state = PWRDM_POWER_ON,
+		.per_min_state = PWRDM_POWER_RET,
 	},
 	{
 		.mpu_state = PWRDM_POWER_OFF,
 		.core_state = PWRDM_POWER_ON,
+		.per_min_state = PWRDM_POWER_RET,
 	},
 	{
 		.mpu_state = PWRDM_POWER_RET,
 		.core_state = PWRDM_POWER_RET,
+		.per_min_state = PWRDM_POWER_OFF,
 	},
 	{
 		.mpu_state = PWRDM_POWER_OFF,
 		.core_state = PWRDM_POWER_RET,
+		.per_min_state = PWRDM_POWER_OFF,
 	},
 	{
 		.mpu_state = PWRDM_POWER_OFF,
 		.core_state = PWRDM_POWER_OFF,
+		.per_min_state = PWRDM_POWER_OFF,
 	},
 };
 
@@ -80,27 +106,25 @@ static int __omap3_enter_idle(struct cpuidle_device *dev,
 				int index)
 {
 	struct omap3_idle_statedata *cx = &omap3_idle_data[index];
-	u32 mpu_state = cx->mpu_state, core_state = cx->core_state;
 
 	local_fiq_disable();
 
-	pwrdm_set_next_pwrst(mpu_pd, mpu_state);
-	pwrdm_set_next_pwrst(core_pd, core_state);
-
 	if (omap_irq_pending() || need_resched())
 		goto return_sleep_time;
 
 	/* Deny idle for C1 */
-	if (index == 0) {
+	if (cx->flags & OMAP_CPUIDLE_CX_NO_CLKDM_IDLE) {
 		clkdm_deny_idle(mpu_pd->pwrdm_clkdms[0]);
-		clkdm_deny_idle(core_pd->pwrdm_clkdms[0]);
+	} else {
+		pwrdm_set_next_pwrst(mpu_pd, cx->mpu_state);
+		pwrdm_set_next_pwrst(core_pd, cx->core_state);
 	}
 
 	/*
 	 * Call idle CPU PM enter notifier chain so that
 	 * VFP context is saved.
 	 */
-	if (mpu_state == PWRDM_POWER_OFF)
+	if (cx->mpu_state == PWRDM_POWER_OFF)
 		cpu_pm_enter();
 
 	/* Execute ARM wfi */
@@ -110,17 +134,15 @@ static int __omap3_enter_idle(struct cpuidle_device *dev,
 	 * Call idle CPU PM enter notifier chain to restore
 	 * VFP context.
 	 */
-	if (pwrdm_read_prev_pwrst(mpu_pd) == PWRDM_POWER_OFF)
+	if (cx->mpu_state == PWRDM_POWER_OFF &&
+	    pwrdm_read_prev_pwrst(mpu_pd) == PWRDM_POWER_OFF)
 		cpu_pm_exit();
 
 	/* Re-allow idle for C1 */
-	if (index == 0) {
+	if (cx->flags & OMAP_CPUIDLE_CX_NO_CLKDM_IDLE)
 		clkdm_allow_idle(mpu_pd->pwrdm_clkdms[0]);
-		clkdm_allow_idle(core_pd->pwrdm_clkdms[0]);
-	}
 
 return_sleep_time:
-
 	local_fiq_enable();
 
 	return index;
@@ -185,7 +207,7 @@ static int next_valid_state(struct cpuidle_device *dev,
 	 * Start search from the next (lower) state.
 	 */
 	for (idx = index - 1; idx >= 0; idx--) {
-		cx =  &omap3_idle_data[idx];
+		cx = &omap3_idle_data[idx];
 		if ((cx->mpu_state >= mpu_deepest_state) &&
 		    (cx->core_state >= core_deepest_state)) {
 			next_index = idx;
@@ -209,10 +231,9 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
 			       struct cpuidle_driver *drv,
 			       int index)
 {
-	int new_state_idx;
-	u32 core_next_state, per_next_state = 0, per_saved_state = 0;
+	int new_state_idx, ret;
+	u8 per_next_state, per_saved_state;
 	struct omap3_idle_statedata *cx;
-	int ret;
 
 	/*
 	 * Use only C1 if CAM is active.
@@ -233,25 +254,13 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
 
 	/* Program PER state */
 	cx = &omap3_idle_data[new_state_idx];
-	core_next_state = cx->core_state;
-	per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd);
-	if (new_state_idx == 0) {
-		/* In C1 do not allow PER state lower than CORE state */
-		if (per_next_state < core_next_state)
-			per_next_state = core_next_state;
-	} else {
-		/*
-		 * Prevent PER OFF if CORE is not in RETention or OFF as this
-		 * would disable PER wakeups completely.
-		 */
-		if ((per_next_state == PWRDM_POWER_OFF) &&
-		    (core_next_state > PWRDM_POWER_RET))
-			per_next_state = PWRDM_POWER_RET;
-	}
 
-	/* Are we changing PER target state? */
-	if (per_next_state != per_saved_state)
+	per_next_state = pwrdm_read_next_pwrst(per_pd);
+	per_saved_state = per_next_state;
+	if (per_next_state < cx->per_min_state) {
+		per_next_state = cx->per_min_state;
 		pwrdm_set_next_pwrst(per_pd, per_next_state);
+	}
 
 	ret = omap3_enter_idle(dev, drv, new_state_idx);
 

arch/arm/mach-omap2/omap-mpuss-lowpower.c

@@ -86,37 +86,6 @@ static inline void set_cpu_wakeup_addr(unsigned int cpu_id, u32 addr)
 	__raw_writel(addr, pm_info->wkup_sar_addr);
 }
 
-/*
- * Set the CPUx powerdomain's previous power state
- */
-static inline void set_cpu_next_pwrst(unsigned int cpu_id,
-				unsigned int power_state)
-{
-	struct omap4_cpu_pm_info *pm_info = &per_cpu(omap4_pm_info, cpu_id);
-
-	pwrdm_set_next_pwrst(pm_info->pwrdm, power_state);
-}
-
-/*
- * Read CPU's previous power state
- */
-static inline unsigned int read_cpu_prev_pwrst(unsigned int cpu_id)
-{
-	struct omap4_cpu_pm_info *pm_info = &per_cpu(omap4_pm_info, cpu_id);
-
-	return pwrdm_read_prev_pwrst(pm_info->pwrdm);
-}
-
-/*
- * Clear the CPUx powerdomain's previous power state
- */
-static inline void clear_cpu_prev_pwrst(unsigned int cpu_id)
-{
-	struct omap4_cpu_pm_info *pm_info = &per_cpu(omap4_pm_info, cpu_id);
-
-	pwrdm_clear_all_prev_pwrst(pm_info->pwrdm);
-}
-
 /*
  * Store the SCU power status value to scratchpad memory
  */
@@ -230,6 +199,7 @@ static void save_l2x0_context(void)
  */
 int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state)
 {
+	struct omap4_cpu_pm_info *pm_info = &per_cpu(omap4_pm_info, cpu);
 	unsigned int save_state = 0;
 	unsigned int wakeup_cpu;
 
@@ -268,7 +238,7 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state)
 		save_state = 2;
 
 	cpu_clear_prev_logic_pwrst(cpu);
-	set_cpu_next_pwrst(cpu, power_state);
+	pwrdm_set_next_pwrst(pm_info->pwrdm, power_state);
 	set_cpu_wakeup_addr(cpu, virt_to_phys(omap4_cpu_resume));
 	scu_pwrst_prepare(cpu, power_state);
 	l2x0_pwrst_prepare(cpu, save_state);
@@ -286,7 +256,7 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state)
 	 * domain transition
 	 */
 	wakeup_cpu = smp_processor_id();
-	set_cpu_next_pwrst(wakeup_cpu, PWRDM_POWER_ON);
+	pwrdm_set_next_pwrst(pm_info->pwrdm, PWRDM_POWER_ON);
 
 	pwrdm_post_transition(NULL);
 
@@ -300,8 +270,8 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state)
  */
 int __cpuinit omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state)
 {
-	unsigned int cpu_state = 0;
 	struct omap4_cpu_pm_info *pm_info = &per_cpu(omap4_pm_info, cpu);
+	unsigned int cpu_state = 0;
 
 	if (omap_rev() == OMAP4430_REV_ES1_0)
 		return -ENXIO;
@@ -309,8 +279,8 @@ int __cpuinit omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state)
 	if (power_state == PWRDM_POWER_OFF)
 		cpu_state = 1;
 
-	clear_cpu_prev_pwrst(cpu);
-	set_cpu_next_pwrst(cpu, power_state);
+	pwrdm_clear_all_prev_pwrst(pm_info->pwrdm);
+	pwrdm_set_next_pwrst(pm_info->pwrdm, power_state);
 	set_cpu_wakeup_addr(cpu, virt_to_phys(pm_info->secondary_startup));
 	scu_pwrst_prepare(cpu, power_state);
 
@@ -321,7 +291,7 @@ int __cpuinit omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state)
 	 */
 	omap4_finish_suspend(cpu_state);
 
-	set_cpu_next_pwrst(cpu, PWRDM_POWER_ON);
+	pwrdm_set_next_pwrst(pm_info->pwrdm, PWRDM_POWER_ON);
 	return 0;
 }
 

arch/arm/mach-omap2/pm-debug.c

@@ -83,10 +83,8 @@ static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
 		strncmp(clkdm->name, "dpll", 4) == 0)
 		return 0;
 
-	seq_printf(s, "%s->%s (%d)", clkdm->name,
-			clkdm->pwrdm.ptr->name,
-			atomic_read(&clkdm->usecount));
-	seq_printf(s, "\n");
+	seq_printf(s, "%s->%s (%d)\n", clkdm->name, clkdm->pwrdm.ptr->name,
+		   clkdm->usecount);
 
 	return 0;
 }

arch/arm/mach-omap2/pm.c

@@ -106,79 +106,18 @@ static void __init omap2_init_processor_devices(void)
 	}
 }
 
-/* Types of sleep_switch used in omap_set_pwrdm_state */
-#define FORCEWAKEUP_SWITCH	0
-#define LOWPOWERSTATE_SWITCH	1
-
 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
 {
+	/* XXX The usecount test is racy */
 	if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
 	    !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
 		clkdm_allow_idle(clkdm);
 	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
-		 atomic_read(&clkdm->usecount) == 0)
+		 clkdm->usecount == 0)
 		clkdm_sleep(clkdm);
 	return 0;
 }
 
-/*
- * This sets pwrdm state (other than mpu & core. Currently only ON &
- * RET are supported.
- */
-int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
-{
-	u8 curr_pwrst, next_pwrst;
-	int sleep_switch = -1, ret = 0, hwsup = 0;
-
-	if (!pwrdm || IS_ERR(pwrdm))
-		return -EINVAL;
-
-	while (!(pwrdm->pwrsts & (1 << pwrst))) {
-		if (pwrst == PWRDM_POWER_OFF)
-			return ret;
-		pwrst--;
-	}
-
-	next_pwrst = pwrdm_read_next_pwrst(pwrdm);
-	if (next_pwrst == pwrst)
-		return ret;
-
-	curr_pwrst = pwrdm_read_pwrst(pwrdm);
-	if (curr_pwrst < PWRDM_POWER_ON) {
-		if ((curr_pwrst > pwrst) &&
-			(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
-			sleep_switch = LOWPOWERSTATE_SWITCH;
-		} else {
-			hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
-			clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
-			sleep_switch = FORCEWAKEUP_SWITCH;
-		}
-	}
-
-	ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
-	if (ret)
-		pr_err("%s: unable to set power state of powerdomain: %s\n",
-		       __func__, pwrdm->name);
-
-	switch (sleep_switch) {
-	case FORCEWAKEUP_SWITCH:
-		if (hwsup)
-			clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
-		else
-			clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
-		break;
-	case LOWPOWERSTATE_SWITCH:
-		pwrdm_set_lowpwrstchange(pwrdm);
-		pwrdm_wait_transition(pwrdm);
-		pwrdm_state_switch(pwrdm);
-		break;
-	}
-
-	return ret;
-}
-
-
-
 /*
  * This API is to be called during init to set the various voltage
  * domains to the voltage as per the opp table. Typically we boot up

arch/arm/mach-omap2/pm.h

@@ -33,7 +33,6 @@ static inline int omap4_idle_init(void)
 extern void *omap3_secure_ram_storage;
 extern void omap3_pm_off_mode_enable(int);
 extern void omap_sram_idle(void);
-extern int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state);
 extern int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused);
 extern int (*omap_pm_suspend)(void);
 

arch/arm/mach-omap2/pm24xx.c

@@ -90,11 +90,7 @@ static int omap2_enter_full_retention(void)
 	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
 	omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
 
-	/*
-	 * Set MPU powerdomain's next power state to RETENTION;
-	 * preserve logic state during retention
-	 */
-	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
+	pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);
 	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
 
 	/* Workaround to kill USB */
@@ -137,6 +133,9 @@ no_sleep:
 	/* Mask future PRCM-to-MPU interrupts */
 	omap2_prm_write_mod_reg(0x0, OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
 
+	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
+	pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_ON);
+
 	return 0;
 }
 
@@ -173,17 +172,16 @@ static void omap2_enter_mpu_retention(void)
 		omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
 
 		/* Try to enter MPU retention */
-		omap2_prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT) |
-				  OMAP_LOGICRETSTATE_MASK,
-				  MPU_MOD, OMAP2_PM_PWSTCTRL);
+		pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
+
 	} else {
 		/* Block MPU retention */
-
-		omap2_prm_write_mod_reg(OMAP_LOGICRETSTATE_MASK, MPU_MOD,
-						 OMAP2_PM_PWSTCTRL);
+		pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
 	}
 
 	omap2_sram_idle();
+
+	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
 }
 
 static int omap2_can_sleep(void)
@@ -238,25 +236,17 @@ static void __init prcm_setup_regs(void)
 	for (i = 0; i < num_mem_banks; i++)
 		pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET);
 
-	/* Set CORE powerdomain's next power state to RETENTION */
-	pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);
+	pwrdm_set_logic_retst(core_pwrdm, PWRDM_POWER_RET);
 
-	/*
-	 * Set MPU powerdomain's next power state to RETENTION;
-	 * preserve logic state during retention
-	 */
 	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
-	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
 
 	/* Force-power down DSP, GFX powerdomains */
 
 	pwrdm = clkdm_get_pwrdm(dsp_clkdm);
 	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
-	clkdm_sleep(dsp_clkdm);
 
 	pwrdm = clkdm_get_pwrdm(gfx_clkdm);
 	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
-	clkdm_sleep(gfx_clkdm);
 
 	/* Enable hardware-supervised idle for all clkdms */
 	clkdm_for_each(omap_pm_clkdms_setup, NULL);

arch/arm/mach-omap2/powerdomain.c

@@ -19,6 +19,7 @@
 #include <linux/list.h>
 #include <linux/errno.h>
 #include <linux/string.h>
+#include <linux/spinlock.h>
 #include <trace/events/power.h>
 
 #include "cm2xxx_3xxx.h"
@@ -42,6 +43,16 @@ enum {
 	PWRDM_STATE_PREV,
 };
 
+/*
+ * Types of sleep_switch used internally in omap_set_pwrdm_state()
+ * and its associated static functions
+ *
+ * XXX Better documentation is needed here
+ */
+#define ALREADYACTIVE_SWITCH		0
+#define FORCEWAKEUP_SWITCH		1
+#define LOWPOWERSTATE_SWITCH		2
+#define ERROR_SWITCH			3
 
 /* pwrdm_list contains all registered struct powerdomains */
 static LIST_HEAD(pwrdm_list);
@@ -101,6 +112,7 @@ static int _pwrdm_register(struct powerdomain *pwrdm)
 	pwrdm->voltdm.ptr = voltdm;
 	INIT_LIST_HEAD(&pwrdm->voltdm_node);
 	voltdm_add_pwrdm(voltdm, pwrdm);
+	spin_lock_init(&pwrdm->_lock);
 
 	list_add(&pwrdm->node, &pwrdm_list);
 
@@ -112,7 +124,7 @@ static int _pwrdm_register(struct powerdomain *pwrdm)
 	for (i = 0; i < pwrdm->banks; i++)
 		pwrdm->ret_mem_off_counter[i] = 0;
 
-	pwrdm_wait_transition(pwrdm);
+	arch_pwrdm->pwrdm_wait_transition(pwrdm);
 	pwrdm->state = pwrdm_read_pwrst(pwrdm);
 	pwrdm->state_counter[pwrdm->state] = 1;
 
@@ -143,7 +155,7 @@ static void _update_logic_membank_counters(struct powerdomain *pwrdm)
 static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
 {
 
-	int prev, state, trace_state = 0;
+	int prev, next, state, trace_state = 0;
 
 	if (pwrdm == NULL)
 		return -EINVAL;
@@ -164,9 +176,10 @@ static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
 		 * If the power domain did not hit the desired state,
 		 * generate a trace event with both the desired and hit states
 		 */
-		if (state != prev) {
+		next = pwrdm_read_next_pwrst(pwrdm);
+		if (next != prev) {
 			trace_state = (PWRDM_TRACE_STATES_FLAG |
-				       ((state & OMAP_POWERSTATE_MASK) << 8) |
+				       ((next & OMAP_POWERSTATE_MASK) << 8) |
 				       ((prev & OMAP_POWERSTATE_MASK) << 0));
 			trace_power_domain_target(pwrdm->name, trace_state,
 						  smp_processor_id());
@@ -199,6 +212,80 @@ static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
 	return 0;
 }
 
+/**
+ * _pwrdm_save_clkdm_state_and_activate - prepare for power state change
+ * @pwrdm: struct powerdomain * to operate on
+ * @curr_pwrst: current power state of @pwrdm
+ * @pwrst: power state to switch to
+ * @hwsup: ptr to a bool to return whether the clkdm is hardware-supervised
+ *
+ * Determine whether the powerdomain needs to be turned on before
+ * attempting to switch power states.  Called by
+ * omap_set_pwrdm_state().  NOTE that if the powerdomain contains
+ * multiple clockdomains, this code assumes that the first clockdomain
+ * supports software-supervised wakeup mode - potentially a problem.
+ * Returns the power state switch mode currently in use (see the
+ * "Types of sleep_switch" comment above).
+ */
+static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm,
+					       u8 curr_pwrst, u8 pwrst,
+					       bool *hwsup)
+{
+	u8 sleep_switch;
+
+	if (curr_pwrst < 0) {
+		WARN_ON(1);
+		sleep_switch = ERROR_SWITCH;
+	} else if (curr_pwrst < PWRDM_POWER_ON) {
+		if (curr_pwrst > pwrst &&
+		    pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
+		    arch_pwrdm->pwrdm_set_lowpwrstchange) {
+			sleep_switch = LOWPOWERSTATE_SWITCH;
+		} else {
+			*hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
+			clkdm_wakeup_nolock(pwrdm->pwrdm_clkdms[0]);
+			sleep_switch = FORCEWAKEUP_SWITCH;
+		}
+	} else {
+		sleep_switch = ALREADYACTIVE_SWITCH;
+	}
+
+	return sleep_switch;
+}
+
+/**
+ * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change
+ * @pwrdm: struct powerdomain * to operate on
+ * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate()
+ * @hwsup: should @pwrdm's first clockdomain be set to hardware-supervised mode?
+ *
+ * Restore the clockdomain state perturbed by
+ * _pwrdm_save_clkdm_state_and_activate(), and call the power state
+ * bookkeeping code.  Called by omap_set_pwrdm_state().  NOTE that if
+ * the powerdomain contains multiple clockdomains, this assumes that
+ * the first associated clockdomain supports either
+ * hardware-supervised idle control in the register, or
+ * software-supervised sleep.  No return value.
+ */
+static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm,
+				       u8 sleep_switch, bool hwsup)
+{
+	switch (sleep_switch) {
+	case FORCEWAKEUP_SWITCH:
+		if (hwsup)
+			clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]);
+		else
+			clkdm_sleep_nolock(pwrdm->pwrdm_clkdms[0]);
+		break;
+	case LOWPOWERSTATE_SWITCH:
+		if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
+		    arch_pwrdm->pwrdm_set_lowpwrstchange)
+			arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
+		pwrdm_state_switch_nolock(pwrdm);
+		break;
+	}
+}
+
 /* Public functions */
 
 /**
@@ -274,6 +361,30 @@ int pwrdm_complete_init(void)
 	return 0;
 }
 
+/**
+ * pwrdm_lock - acquire a Linux spinlock on a powerdomain
+ * @pwrdm: struct powerdomain * to lock
+ *
+ * Acquire the powerdomain spinlock on @pwrdm.  No return value.
+ */
+void pwrdm_lock(struct powerdomain *pwrdm)
+	__acquires(&pwrdm->_lock)
+{
+	spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags);
+}
+
+/**
+ * pwrdm_unlock - release a Linux spinlock on a powerdomain
+ * @pwrdm: struct powerdomain * to unlock
+ *
+ * Release the powerdomain spinlock on @pwrdm.  No return value.
+ */
+void pwrdm_unlock(struct powerdomain *pwrdm)
+	__releases(&pwrdm->_lock)
+{
+	spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags);
+}
+
 /**
  * pwrdm_lookup - look up a powerdomain by name, return a pointer
  * @name: name of powerdomain
@@ -920,65 +1031,27 @@ bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
 	return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
 }
 
-/**
- * pwrdm_set_lowpwrstchange - Request a low power state change
- * @pwrdm: struct powerdomain *
- *
- * Allows a powerdomain to transtion to a lower power sleep state
- * from an existing sleep state without waking up the powerdomain.
- * Returns -EINVAL if the powerdomain pointer is null or if the
- * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0
- * upon success.
- */
-int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
-{
-	int ret = -EINVAL;
-
-	if (!pwrdm)
-		return -EINVAL;
-
-	if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE))
-		return -EINVAL;
-
-	pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n",
-		 pwrdm->name);
-
-	if (arch_pwrdm && arch_pwrdm->pwrdm_set_lowpwrstchange)
-		ret = arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
-
-	return ret;
-}
-
-/**
- * pwrdm_wait_transition - wait for powerdomain power transition to finish
- * @pwrdm: struct powerdomain * to wait for
- *
- * If the powerdomain @pwrdm is in the process of a state transition,
- * spin until it completes the power transition, or until an iteration
- * bailout value is reached. Returns -EINVAL if the powerdomain
- * pointer is null, -EAGAIN if the bailout value was reached, or
- * returns 0 upon success.
- */
-int pwrdm_wait_transition(struct powerdomain *pwrdm)
+int pwrdm_state_switch_nolock(struct powerdomain *pwrdm)
 {
-	int ret = -EINVAL;
+	int ret;
 
-	if (!pwrdm)
+	if (!pwrdm || !arch_pwrdm)
 		return -EINVAL;
 
-	if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition)
-		ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
+	ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
+	if (!ret)
+		ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
 
 	return ret;
 }
 
-int pwrdm_state_switch(struct powerdomain *pwrdm)
+int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm)
 {
 	int ret;
 
-	ret = pwrdm_wait_transition(pwrdm);
-	if (!ret)
-		ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
+	pwrdm_lock(pwrdm);
+	ret = pwrdm_state_switch_nolock(pwrdm);
+	pwrdm_unlock(pwrdm);
 
 	return ret;
 }
@@ -1003,6 +1076,61 @@ int pwrdm_post_transition(struct powerdomain *pwrdm)
 	return 0;
 }
 
+/**
+ * omap_set_pwrdm_state - change a powerdomain's current power state
+ * @pwrdm: struct powerdomain * to change the power state of
+ * @pwrst: power state to change to
+ *
+ * Change the current hardware power state of the powerdomain
+ * represented by @pwrdm to the power state represented by @pwrst.
+ * Returns -EINVAL if @pwrdm is null or invalid or if the
+ * powerdomain's current power state could not be read, or returns 0
+ * upon success or if @pwrdm does not support @pwrst or any
+ * lower-power state.  XXX Should not return 0 if the @pwrdm does not
+ * support @pwrst or any lower-power state: this should be an error.
+ */
+int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
+{
+	u8 curr_pwrst, next_pwrst, sleep_switch;
+	int ret = 0;
+	bool hwsup = false;
+
+	if (!pwrdm || IS_ERR(pwrdm))
+		return -EINVAL;
+
+	while (!(pwrdm->pwrsts & (1 << pwrst))) {
+		if (pwrst == PWRDM_POWER_OFF)
+			return ret;
+		pwrst--;
+	}
+
+	pwrdm_lock(pwrdm);
+
+	curr_pwrst = pwrdm_read_pwrst(pwrdm);
+	next_pwrst = pwrdm_read_next_pwrst(pwrdm);
+	if (curr_pwrst == pwrst && next_pwrst == pwrst)
+		goto osps_out;
+
+	sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
+							    pwrst, &hwsup);
+	if (sleep_switch == ERROR_SWITCH) {
+		ret = -EINVAL;
+		goto osps_out;
+	}
+
+	ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
+	if (ret)
+		pr_err("%s: unable to set power state of powerdomain: %s\n",
+		       __func__, pwrdm->name);
+
+	_pwrdm_restore_clkdm_state(pwrdm, sleep_switch, hwsup);
+
+osps_out:
+	pwrdm_unlock(pwrdm);
+
+	return ret;
+}
+
 /**
  * pwrdm_get_context_loss_count - get powerdomain's context loss count
  * @pwrdm: struct powerdomain * to wait for

arch/arm/mach-omap2/powerdomain.h

@@ -19,8 +19,7 @@
 
 #include <linux/types.h>
 #include <linux/list.h>
-
-#include <linux/atomic.h>
+#include <linux/spinlock.h>
 
 #include "voltage.h"
 
@@ -44,18 +43,20 @@
 #define PWRSTS_OFF_RET_ON	(PWRSTS_OFF_RET | PWRSTS_ON)
 
 
-/* Powerdomain flags */
-#define PWRDM_HAS_HDWR_SAR	(1 << 0) /* hardware save-and-restore support */
-#define PWRDM_HAS_MPU_QUIRK	(1 << 1) /* MPU pwr domain has MEM bank 0 bits
-					  * in MEM bank 1 position. This is
-					  * true for OMAP3430
-					  */
-#define PWRDM_HAS_LOWPOWERSTATECHANGE	(1 << 2) /*
-						  * support to transition from a
-						  * sleep state to a lower sleep
-						  * state without waking up the
-						  * powerdomain
-						  */
+/*
+ * Powerdomain flags (struct powerdomain.flags)
+ *
+ * PWRDM_HAS_HDWR_SAR - powerdomain has hardware save-and-restore support
+ *
+ * PWRDM_HAS_MPU_QUIRK - MPU pwr domain has MEM bank 0 bits in MEM
+ * bank 1 position. This is true for OMAP3430
+ *
+ * PWRDM_HAS_LOWPOWERSTATECHANGE - can transition from a sleep state
+ * to a lower sleep state without waking up the powerdomain
+ */
+#define PWRDM_HAS_HDWR_SAR		BIT(0)
+#define PWRDM_HAS_MPU_QUIRK		BIT(1)
+#define PWRDM_HAS_LOWPOWERSTATECHANGE	BIT(2)
 
 /*
  * Number of memory banks that are power-controllable.	On OMAP4430, the
@@ -103,6 +104,8 @@ struct powerdomain;
  * @state_counter:
  * @timer:
  * @state_timer:
+ * @_lock: spinlock used to serialize powerdomain and some clockdomain ops
+ * @_lock_flags: stored flags when @_lock is taken
  *
  * @prcm_partition possible values are defined in mach-omap2/prcm44xx.h.
  */
@@ -127,7 +130,8 @@ struct powerdomain {
 	unsigned state_counter[PWRDM_MAX_PWRSTS];
 	unsigned ret_logic_off_counter;
 	unsigned ret_mem_off_counter[PWRDM_MAX_MEM_BANKS];
-
+	spinlock_t _lock;
+	unsigned long _lock_flags;
 	const u8 pwrstctrl_offs;
 	const u8 pwrstst_offs;
 	const u32 logicretstate_mask;
@@ -162,6 +166,16 @@ struct powerdomain {
  * @pwrdm_disable_hdwr_sar: Disable Hardware Save-Restore feature for a pd
  * @pwrdm_set_lowpwrstchange: Enable pd transitions from a shallow to deep sleep
  * @pwrdm_wait_transition: Wait for a pd state transition to complete
+ *
+ * Regarding @pwrdm_set_lowpwrstchange: On the OMAP2 and 3-family
+ * chips, a powerdomain's power state is not allowed to directly
+ * transition from one low-power state (e.g., CSWR) to another
+ * low-power state (e.g., OFF) without first waking up the
+ * powerdomain.  This wastes energy.  So OMAP4 chips support the
+ * ability to transition a powerdomain power state directly from one
+ * low-power state to another.  The function pointed to by
+ * @pwrdm_set_lowpwrstchange is intended to configure the OMAP4
+ * hardware powerdomain state machine to enable this feature.
  */
 struct pwrdm_ops {
 	int	(*pwrdm_set_next_pwrst)(struct powerdomain *pwrdm, u8 pwrst);
@@ -225,15 +239,15 @@ int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm);
 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm);
 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm);
 
-int pwrdm_wait_transition(struct powerdomain *pwrdm);
-
+int pwrdm_state_switch_nolock(struct powerdomain *pwrdm);
 int pwrdm_state_switch(struct powerdomain *pwrdm);
 int pwrdm_pre_transition(struct powerdomain *pwrdm);
 int pwrdm_post_transition(struct powerdomain *pwrdm);
-int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm);
 int pwrdm_get_context_loss_count(struct powerdomain *pwrdm);
 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm);
 
+extern int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 state);
+
 extern void omap242x_powerdomains_init(void);
 extern void omap243x_powerdomains_init(void);
 extern void omap3xxx_powerdomains_init(void);
@@ -253,5 +267,7 @@ extern u32 omap2_pwrdm_get_mem_bank_stst_mask(u8 bank);
 extern struct powerdomain wkup_omap2_pwrdm;
 extern struct powerdomain gfx_omap2_pwrdm;
 
+extern void pwrdm_lock(struct powerdomain *pwrdm);
+extern void pwrdm_unlock(struct powerdomain *pwrdm);
 
 #endif

arch/arm/mach-omap2/powerdomains2xxx_3xxx_data.c

@@ -54,12 +54,12 @@ struct powerdomain gfx_omap2_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 struct powerdomain wkup_omap2_pwrdm = {
 	.name		= "wkup_pwrdm",
 	.prcm_offs	= WKUP_MOD,
 	.pwrsts		= PWRSTS_ON,
-	.voltdm         = { .name = "wakeup" },
+	.voltdm		= { .name = "wakeup" },
 };

arch/arm/mach-omap2/powerdomains2xxx_data.c

@@ -38,7 +38,7 @@ static struct powerdomain dsp_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain mpu_24xx_pwrdm = {
@@ -53,13 +53,14 @@ static struct powerdomain mpu_24xx_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain core_24xx_pwrdm = {
 	.name		  = "core_pwrdm",
 	.prcm_offs	  = CORE_MOD,
 	.pwrsts		  = PWRSTS_OFF_RET_ON,
+	.pwrsts_logic_ret = PWRSTS_RET,
 	.banks		  = 3,
 	.pwrsts_mem_ret	  = {
 		[0] = PWRSTS_OFF_RET,	 /* MEM1RETSTATE */
@@ -71,7 +72,7 @@ static struct powerdomain core_24xx_pwrdm = {
 		[1] = PWRSTS_OFF_RET_ON, /* MEM2ONSTATE */
 		[2] = PWRSTS_OFF_RET_ON, /* MEM3ONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 
@@ -93,7 +94,7 @@ static struct powerdomain mdm_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 /*

arch/arm/mach-omap2/powerdomains3xxx_data.c

@@ -50,7 +50,7 @@ static struct powerdomain iva2_pwrdm = {
 		[2] = PWRSTS_OFF_ON,
 		[3] = PWRSTS_ON,
 	},
-	.voltdm           = { .name = "mpu_iva" },
+	.voltdm		  = { .name = "mpu_iva" },
 };
 
 static struct powerdomain mpu_3xxx_pwrdm = {
@@ -66,7 +66,7 @@ static struct powerdomain mpu_3xxx_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_OFF_ON,
 	},
-	.voltdm           = { .name = "mpu_iva" },
+	.voltdm		  = { .name = "mpu_iva" },
 };
 
 static struct powerdomain mpu_am35x_pwrdm = {
@@ -82,7 +82,7 @@ static struct powerdomain mpu_am35x_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,
 	},
-	.voltdm           = { .name = "mpu_iva" },
+	.voltdm		  = { .name = "mpu_iva" },
 };
 
 /*
@@ -109,7 +109,7 @@ static struct powerdomain core_3xxx_pre_es3_1_pwrdm = {
 		[0] = PWRSTS_OFF_RET_ON, /* MEM1ONSTATE */
 		[1] = PWRSTS_OFF_RET_ON, /* MEM2ONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain core_3xxx_es3_1_pwrdm = {
@@ -131,7 +131,7 @@ static struct powerdomain core_3xxx_es3_1_pwrdm = {
 		[0] = PWRSTS_OFF_RET_ON, /* MEM1ONSTATE */
 		[1] = PWRSTS_OFF_RET_ON, /* MEM2ONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain core_am35x_pwrdm = {
@@ -148,7 +148,7 @@ static struct powerdomain core_am35x_pwrdm = {
 		[0] = PWRSTS_ON, /* MEM1ONSTATE */
 		[1] = PWRSTS_ON, /* MEM2ONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain dss_pwrdm = {
@@ -163,7 +163,7 @@ static struct powerdomain dss_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain dss_am35x_pwrdm = {
@@ -178,7 +178,7 @@ static struct powerdomain dss_am35x_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 /*
@@ -199,7 +199,7 @@ static struct powerdomain sgx_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain sgx_am35x_pwrdm = {
@@ -214,7 +214,7 @@ static struct powerdomain sgx_am35x_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain cam_pwrdm = {
@@ -229,7 +229,7 @@ static struct powerdomain cam_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain per_pwrdm = {
@@ -244,7 +244,7 @@ static struct powerdomain per_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain per_am35x_pwrdm = {
@@ -259,13 +259,13 @@ static struct powerdomain per_am35x_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain emu_pwrdm = {
 	.name		= "emu_pwrdm",
 	.prcm_offs	= OMAP3430_EMU_MOD,
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain neon_pwrdm = {
@@ -273,7 +273,7 @@ static struct powerdomain neon_pwrdm = {
 	.prcm_offs	  = OMAP3430_NEON_MOD,
 	.pwrsts		  = PWRSTS_OFF_RET_ON,
 	.pwrsts_logic_ret = PWRSTS_RET,
-	.voltdm           = { .name = "mpu_iva" },
+	.voltdm		  = { .name = "mpu_iva" },
 };
 
 static struct powerdomain neon_am35x_pwrdm = {
@@ -281,7 +281,7 @@ static struct powerdomain neon_am35x_pwrdm = {
 	.prcm_offs	  = OMAP3430_NEON_MOD,
 	.pwrsts		  = PWRSTS_ON,
 	.pwrsts_logic_ret = PWRSTS_ON,
-	.voltdm           = { .name = "mpu_iva" },
+	.voltdm		  = { .name = "mpu_iva" },
 };
 
 static struct powerdomain usbhost_pwrdm = {
@@ -303,37 +303,37 @@ static struct powerdomain usbhost_pwrdm = {
 	.pwrsts_mem_on	  = {
 		[0] = PWRSTS_ON,  /* MEMONSTATE */
 	},
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain dpll1_pwrdm = {
 	.name		= "dpll1_pwrdm",
 	.prcm_offs	= MPU_MOD,
-	.voltdm           = { .name = "mpu_iva" },
+	.voltdm		  = { .name = "mpu_iva" },
 };
 
 static struct powerdomain dpll2_pwrdm = {
 	.name		= "dpll2_pwrdm",
 	.prcm_offs	= OMAP3430_IVA2_MOD,
-	.voltdm           = { .name = "mpu_iva" },
+	.voltdm		  = { .name = "mpu_iva" },
 };
 
 static struct powerdomain dpll3_pwrdm = {
 	.name		= "dpll3_pwrdm",
 	.prcm_offs	= PLL_MOD,
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain dpll4_pwrdm = {
 	.name		= "dpll4_pwrdm",
 	.prcm_offs	= PLL_MOD,
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 static struct powerdomain dpll5_pwrdm = {
 	.name		= "dpll5_pwrdm",
 	.prcm_offs	= PLL_MOD,
-	.voltdm           = { .name = "core" },
+	.voltdm		  = { .name = "core" },
 };
 
 /* As powerdomains are added or removed above, this list must also be changed */

arch/arm/mach-omap2/prm2xxx_3xxx.c

@@ -210,6 +210,7 @@ int omap2_clkdm_read_wkdep(struct clockdomain *clkdm1,
 					     PM_WKDEP, (1 << clkdm2->dep_bit));
 }
 
+/* XXX Caller must hold the clkdm's powerdomain lock */
 int omap2_clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
 {
 	struct clkdm_dep *cd;
@@ -221,7 +222,7 @@ int omap2_clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
 
 		/* PRM accesses are slow, so minimize them */
 		mask |= 1 << cd->clkdm->dep_bit;
-		atomic_set(&cd->wkdep_usecount, 0);
+		cd->wkdep_usecount = 0;
 	}
 
 	omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,