@@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/reset-controller.h>
@@ -50,6 +51,30 @@ enum gdsc_status {
GDSC_ON
};
+static int gdsc_pm_runtime_get(struct gdsc *sc)
+{
+ int ret;
+
+ if (!sc->rpm_dev)
+ return 0;
+
+ ret = pm_runtime_get_sync(sc->rpm_dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(sc->rpm_dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int gdsc_pm_runtime_put(struct gdsc *sc)
+{
+ if (!sc->rpm_dev)
+ return 0;
+
+ return pm_runtime_put_sync(sc->rpm_dev);
+}
+
/* Returns 1 if GDSC status is status, 0 if not, and < 0 on error */
static int gdsc_check_status(struct gdsc *sc, enum gdsc_status status)
{
@@ -232,9 +257,8 @@ static void gdsc_retain_ff_on(struct gdsc *sc)
regmap_update_bits(sc->regmap, sc->gdscr, mask, mask);
}
-static int gdsc_enable(struct generic_pm_domain *domain)
+static int _gdsc_enable(struct gdsc *sc)
{
- struct gdsc *sc = domain_to_gdsc(domain);
int ret;
if (sc->pwrsts == PWRSTS_ON)
@@ -290,11 +314,28 @@ static int gdsc_enable(struct generic_pm_domain *domain)
return 0;
}
-static int gdsc_disable(struct generic_pm_domain *domain)
+static int gdsc_enable(struct generic_pm_domain *domain)
{
struct gdsc *sc = domain_to_gdsc(domain);
int ret;
+ ret = gdsc_pm_runtime_get(sc);
+ if (ret)
+ return ret;
+
+ ret = _gdsc_enable(sc);
+ if (ret) {
+ gdsc_pm_runtime_put(sc);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int _gdsc_disable(struct gdsc *sc)
+{
+ int ret;
+
if (sc->pwrsts == PWRSTS_ON)
return gdsc_assert_reset(sc);
@@ -329,6 +370,18 @@ static int gdsc_disable(struct generic_pm_domain *domain)
return 0;
}
+static int gdsc_disable(struct generic_pm_domain *domain)
+{
+ struct gdsc *sc = domain_to_gdsc(domain);
+ int ret;
+
+ ret = _gdsc_disable(sc);
+ if (ret)
+ return ret;
+
+ return gdsc_pm_runtime_put(sc);
+}
+
static int gdsc_init(struct gdsc *sc)
{
u32 mask, val;
@@ -425,6 +478,8 @@ int gdsc_register(struct gdsc_desc *desc,
for (i = 0; i < num; i++) {
if (!scs[i])
continue;
+ if (pm_runtime_enabled(dev))
+ scs[i]->rpm_dev = dev;
scs[i]->regmap = regmap;
scs[i]->rcdev = rcdev;
ret = gdsc_init(scs[i]);
@@ -486,7 +541,10 @@ void gdsc_unregister(struct gdsc_desc *desc)
*/
int gdsc_gx_do_nothing_enable(struct generic_pm_domain *domain)
{
+ struct gdsc *sc = domain_to_gdsc(domain);
+
/* Do nothing but give genpd the impression that we were successful */
- return 0;
+ /* Get the runtime PM device only */
+ return gdsc_pm_runtime_get(sc);
}
EXPORT_SYMBOL_GPL(gdsc_gx_do_nothing_enable);
@@ -25,6 +25,7 @@ struct reset_controller_dev;
* @resets: ids of resets associated with this gdsc
* @reset_count: number of @resets
* @rcdev: reset controller
+ * @rpm_dev: runtime PM device
*/
struct gdsc {
struct generic_pm_domain pd;
@@ -58,6 +59,7 @@ struct gdsc {
const char *supply;
struct regulator *rsupply;
+ struct device *rpm_dev;
};
struct gdsc_desc {
In order to properly handle runtime PM status of the provider device, call pm_runtime_get/pm_runtime_put on the clock controller device. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/clk/qcom/gdsc.c | 66 ++++++++++++++++++++++++++++++++++++++--- drivers/clk/qcom/gdsc.h | 2 ++ 2 files changed, 64 insertions(+), 4 deletions(-)