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path: root/drivers/base/power/clock_ops.c
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Diffstat (limited to 'drivers/base/power/clock_ops.c')
-rw-r--r--drivers/base/power/clock_ops.c150
1 files changed, 53 insertions, 97 deletions
diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
index 78369305e069..d626576a4f75 100644
--- a/drivers/base/power/clock_ops.c
+++ b/drivers/base/power/clock_ops.c
@@ -12,6 +12,7 @@
#include <linux/pm.h>
#include <linux/pm_clock.h>
#include <linux/clk.h>
+#include <linux/clkdev.h>
#include <linux/slab.h>
#include <linux/err.h>
@@ -34,14 +35,20 @@ struct pm_clock_entry {
/**
* pm_clk_enable - Enable a clock, reporting any errors
* @dev: The device for the given clock
- * @clk: The clock being enabled.
+ * @ce: PM clock entry corresponding to the clock.
*/
-static inline int __pm_clk_enable(struct device *dev, struct clk *clk)
+static inline int __pm_clk_enable(struct device *dev, struct pm_clock_entry *ce)
{
- int ret = clk_enable(clk);
- if (ret)
- dev_err(dev, "%s: failed to enable clk %p, error %d\n",
- __func__, clk, ret);
+ int ret;
+
+ if (ce->status < PCE_STATUS_ERROR) {
+ ret = clk_enable(ce->clk);
+ if (!ret)
+ ce->status = PCE_STATUS_ENABLED;
+ else
+ dev_err(dev, "%s: failed to enable clk %p, error %d\n",
+ __func__, ce->clk, ret);
+ }
return ret;
}
@@ -53,7 +60,8 @@ static inline int __pm_clk_enable(struct device *dev, struct clk *clk)
*/
static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
{
- ce->clk = clk_get(dev, ce->con_id);
+ if (!ce->clk)
+ ce->clk = clk_get(dev, ce->con_id);
if (IS_ERR(ce->clk)) {
ce->status = PCE_STATUS_ERROR;
} else {
@@ -63,15 +71,8 @@ static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
}
}
-/**
- * pm_clk_add - Start using a device clock for power management.
- * @dev: Device whose clock is going to be used for power management.
- * @con_id: Connection ID of the clock.
- *
- * Add the clock represented by @con_id to the list of clocks used for
- * the power management of @dev.
- */
-int pm_clk_add(struct device *dev, const char *con_id)
+static int __pm_clk_add(struct device *dev, const char *con_id,
+ struct clk *clk)
{
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce;
@@ -93,6 +94,12 @@ int pm_clk_add(struct device *dev, const char *con_id)
kfree(ce);
return -ENOMEM;
}
+ } else {
+ if (IS_ERR(ce->clk) || !__clk_get(clk)) {
+ kfree(ce);
+ return -ENOENT;
+ }
+ ce->clk = clk;
}
pm_clk_acquire(dev, ce);
@@ -104,6 +111,32 @@ int pm_clk_add(struct device *dev, const char *con_id)
}
/**
+ * pm_clk_add - Start using a device clock for power management.
+ * @dev: Device whose clock is going to be used for power management.
+ * @con_id: Connection ID of the clock.
+ *
+ * Add the clock represented by @con_id to the list of clocks used for
+ * the power management of @dev.
+ */
+int pm_clk_add(struct device *dev, const char *con_id)
+{
+ return __pm_clk_add(dev, con_id, NULL);
+}
+
+/**
+ * pm_clk_add_clk - Start using a device clock for power management.
+ * @dev: Device whose clock is going to be used for power management.
+ * @clk: Clock pointer
+ *
+ * Add the clock to the list of clocks used for the power management of @dev.
+ * It will increment refcount on clock pointer, use clk_put() on it when done.
+ */
+int pm_clk_add_clk(struct device *dev, struct clk *clk)
+{
+ return __pm_clk_add(dev, NULL, clk);
+}
+
+/**
* __pm_clk_remove - Destroy PM clock entry.
* @ce: PM clock entry to destroy.
*/
@@ -223,10 +256,6 @@ void pm_clk_destroy(struct device *dev)
}
}
-#endif /* CONFIG_PM */
-
-#ifdef CONFIG_PM_RUNTIME
-
/**
* pm_clk_suspend - Disable clocks in a device's PM clock list.
* @dev: Device to disable the clocks for.
@@ -266,7 +295,6 @@ int pm_clk_resume(struct device *dev)
struct pm_subsys_data *psd = dev_to_psd(dev);
struct pm_clock_entry *ce;
unsigned long flags;
- int ret;
dev_dbg(dev, "%s()\n", __func__);
@@ -275,13 +303,8 @@ int pm_clk_resume(struct device *dev)
spin_lock_irqsave(&psd->lock, flags);
- list_for_each_entry(ce, &psd->clock_list, node) {
- if (ce->status < PCE_STATUS_ERROR) {
- ret = __pm_clk_enable(dev, ce->clk);
- if (!ret)
- ce->status = PCE_STATUS_ENABLED;
- }
- }
+ list_for_each_entry(ce, &psd->clock_list, node)
+ __pm_clk_enable(dev, ce);
spin_unlock_irqrestore(&psd->lock, flags);
@@ -346,74 +369,7 @@ static int pm_clk_notify(struct notifier_block *nb,
return 0;
}
-#else /* !CONFIG_PM_RUNTIME */
-
-#ifdef CONFIG_PM
-
-/**
- * pm_clk_suspend - Disable clocks in a device's PM clock list.
- * @dev: Device to disable the clocks for.
- */
-int pm_clk_suspend(struct device *dev)
-{
- struct pm_subsys_data *psd = dev_to_psd(dev);
- struct pm_clock_entry *ce;
- unsigned long flags;
-
- dev_dbg(dev, "%s()\n", __func__);
-
- /* If there is no driver, the clocks are already disabled. */
- if (!psd || !dev->driver)
- return 0;
-
- spin_lock_irqsave(&psd->lock, flags);
-
- list_for_each_entry_reverse(ce, &psd->clock_list, node) {
- if (ce->status < PCE_STATUS_ERROR) {
- if (ce->status == PCE_STATUS_ENABLED)
- clk_disable(ce->clk);
- ce->status = PCE_STATUS_ACQUIRED;
- }
- }
-
- spin_unlock_irqrestore(&psd->lock, flags);
-
- return 0;
-}
-
-/**
- * pm_clk_resume - Enable clocks in a device's PM clock list.
- * @dev: Device to enable the clocks for.
- */
-int pm_clk_resume(struct device *dev)
-{
- struct pm_subsys_data *psd = dev_to_psd(dev);
- struct pm_clock_entry *ce;
- unsigned long flags;
- int ret;
-
- dev_dbg(dev, "%s()\n", __func__);
-
- /* If there is no driver, the clocks should remain disabled. */
- if (!psd || !dev->driver)
- return 0;
-
- spin_lock_irqsave(&psd->lock, flags);
-
- list_for_each_entry(ce, &psd->clock_list, node) {
- if (ce->status < PCE_STATUS_ERROR) {
- ret = __pm_clk_enable(dev, ce->clk);
- if (!ret)
- ce->status = PCE_STATUS_ENABLED;
- }
- }
-
- spin_unlock_irqrestore(&psd->lock, flags);
-
- return 0;
-}
-
-#endif /* CONFIG_PM */
+#else /* !CONFIG_PM */
/**
* enable_clock - Enable a device clock.
@@ -493,7 +449,7 @@ static int pm_clk_notify(struct notifier_block *nb,
return 0;
}
-#endif /* !CONFIG_PM_RUNTIME */
+#endif /* !CONFIG_PM */
/**
* pm_clk_add_notifier - Add bus type notifier for power management clocks.