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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
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>
-rw-r--r--drivers/base/power/clock_ops.c60
-rw-r--r--include/linux/pm_runtime.h2
-rw-r--r--kernel/power/Kconfig4
3 files changed, 62 insertions, 4 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.
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index ef91904c7110..1bd5063a2cc8 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -251,7 +251,7 @@ struct pm_clk_notifier_block {
char *con_ids[];
};
-#ifdef CONFIG_PM_RUNTIME_CLK
+#ifdef CONFIG_PM_CLK
extern int pm_runtime_clk_init(struct device *dev);
extern void pm_runtime_clk_destroy(struct device *dev);
extern int pm_runtime_clk_add(struct device *dev, const char *con_id);
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index e83ac2556c86..7b856b3458d2 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -224,9 +224,9 @@ config PM_OPP
implementations a ready to use framework to manage OPPs.
For more information, read <file:Documentation/power/opp.txt>
-config PM_RUNTIME_CLK
+config PM_CLK
def_bool y
- depends on PM_RUNTIME && HAVE_CLK
+ depends on PM && HAVE_CLK
config PM_GENERIC_DOMAINS
bool