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authorRafael J. Wysocki <rjw@sisk.pl>2011-07-01 22:13:37 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-07-02 14:29:56 +0200
commitb7b95920aa2e89e655afe9913ee0e55855ceda90 (patch)
tree6f7f30252e2b4b518d76906706a745107288a701 /drivers/base
parentd4f2d87a8b46c14c4307c690c92bd08229f66ecf (diff)
PM: Allow the clocks management code to be used during system suspend
The common clocks management code in drivers/base/power/clock_ops.c is going to be used during system-wide power transitions as well as for runtime PM, so it shouldn't depend on CONFIG_PM_RUNTIME. However, the suspend/resume functions provided by it for CONFIG_PM_RUNTIME unset, to be used during system-wide power transitions, should not behave in the same way as their counterparts defined for CONFIG_PM_RUNTIME set, because in that case the clocks are managed differently at run time. The names of the functions still contain the word "runtime" after this change, but that is going to be modified by a separate patch later. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Reviewed-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/clock_ops.c60
1 files changed, 59 insertions, 1 deletions
diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
index c5624818259e..2fb9c121c64b 100644
--- a/drivers/base/power/clock_ops.c
+++ b/drivers/base/power/clock_ops.c
@@ -15,7 +15,7 @@
#include <linux/slab.h>
#include <linux/err.h>
-#ifdef CONFIG_PM_RUNTIME
+#ifdef CONFIG_PM
struct pm_runtime_clk_data {
struct list_head clock_list;
@@ -191,6 +191,10 @@ void pm_runtime_clk_destroy(struct device *dev)
kfree(prd);
}
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_PM_RUNTIME
+
/**
* pm_runtime_clk_acquire - Acquire a device clock.
* @dev: Device whose clock is to be acquired.
@@ -330,6 +334,60 @@ static int pm_runtime_clk_notify(struct notifier_block *nb,
#else /* !CONFIG_PM_RUNTIME */
+#ifdef CONFIG_PM
+
+/**
+ * pm_runtime_clk_suspend - Disable clocks in a device's PM clock list.
+ * @dev: Device to disable the clocks for.
+ */
+int pm_runtime_clk_suspend(struct device *dev)
+{
+ struct pm_runtime_clk_data *prd = __to_prd(dev);
+ struct pm_clock_entry *ce;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ /* If there is no driver, the clocks are already disabled. */
+ if (!prd || !dev->driver)
+ return 0;
+
+ mutex_lock(&prd->lock);
+
+ list_for_each_entry_reverse(ce, &prd->clock_list, node)
+ clk_disable(ce->clk);
+
+ mutex_unlock(&prd->lock);
+
+ return 0;
+}
+
+/**
+ * pm_runtime_clk_resume - Enable clocks in a device's PM clock list.
+ * @dev: Device to enable the clocks for.
+ */
+int pm_runtime_clk_resume(struct device *dev)
+{
+ struct pm_runtime_clk_data *prd = __to_prd(dev);
+ struct pm_clock_entry *ce;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ /* If there is no driver, the clocks should remain disabled. */
+ if (!prd || !dev->driver)
+ return 0;
+
+ mutex_lock(&prd->lock);
+
+ list_for_each_entry(ce, &prd->clock_list, node)
+ clk_enable(ce->clk);
+
+ mutex_unlock(&prd->lock);
+
+ return 0;
+}
+
+#endif /* CONFIG_PM */
+
/**
* enable_clock - Enable a device clock.
* @dev: Device whose clock is to be enabled.