Later patches would add support for custom opp_set_rate callbacks. This patch separates out the code for generic opp_set_rate handler in order to prepare for that.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Tested-by: Dave Gerlach d-gerlach@ti.com --- drivers/base/power/opp/core.c | 180 +++++++++++++++++++++++++++++------------- drivers/base/power/opp/opp.h | 2 + include/linux/pm_opp.h | 33 ++++++++ 3 files changed, 162 insertions(+), 53 deletions(-)
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 5a35fdd4b61b..dedb08a66e99 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -596,6 +596,69 @@ static int _set_opp_voltage(struct device *dev, struct regulator *reg, return ret; }
+static inline int +_generic_set_opp_clk_only(struct device *dev, struct clk *clk, + unsigned long old_freq, unsigned long freq) +{ + int ret; + + ret = clk_set_rate(clk, freq); + if (ret) { + dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, + ret); + } + + return ret; +} + +static int _generic_set_opp(struct device *dev, + struct dev_pm_set_opp_data *data) +{ + struct dev_pm_opp_supply *old_supply = data->old_opp.supplies; + struct dev_pm_opp_supply *new_supply = data->new_opp.supplies; + unsigned long old_freq = data->old_opp.rate, freq = data->new_opp.rate; + struct regulator *reg = data->regulators[0]; + int ret; + + /* This function only supports single regulator per device */ + if (WARN_ON(data->regulator_count > 1)) { + dev_err(dev, "multiple regulators are not supported\n"); + return -EINVAL; + } + + /* Scaling up? Scale voltage before frequency */ + if (freq > old_freq) { + ret = _set_opp_voltage(dev, reg, new_supply); + if (ret) + goto restore_voltage; + } + + /* Change frequency */ + ret = _generic_set_opp_clk_only(dev, data->clk, old_freq, freq); + if (ret) + goto restore_voltage; + + /* Scaling down? Scale voltage after frequency */ + if (freq < old_freq) { + ret = _set_opp_voltage(dev, reg, new_supply); + if (ret) + goto restore_freq; + } + + return 0; + +restore_freq: + if (_generic_set_opp_clk_only(dev, data->clk, freq, old_freq)) + dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", + __func__, old_freq); +restore_voltage: + /* This shouldn't harm even if the voltages weren't updated earlier */ + if (old_supply->u_volt) + _set_opp_voltage(dev, reg, old_supply); + + return ret; +} + /** * dev_pm_opp_set_rate() - Configure new OPP based on frequency * @dev: device for which we do this operation @@ -609,12 +672,12 @@ static int _set_opp_voltage(struct device *dev, struct regulator *reg, int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) { struct opp_table *opp_table; + unsigned long freq, old_freq; struct dev_pm_opp *old_opp, *opp; - struct regulator *reg = ERR_PTR(-ENXIO); + struct regulator **regulators; + struct dev_pm_set_opp_data *data; struct clk *clk; - unsigned long freq, old_freq; - struct dev_pm_opp_supply old_supply, new_supply; - int ret; + int ret, size;
if (unlikely(!target_freq)) { dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, @@ -663,64 +726,35 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) return ret; }
- if (opp_table->regulators) { - /* This function only supports single regulator per device */ - if (WARN_ON(opp_table->regulator_count > 1)) { - dev_err(dev, "multiple regulators not supported\n"); - rcu_read_unlock(); - return -EINVAL; - } + dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, + old_freq, freq);
- reg = opp_table->regulators[0]; + regulators = opp_table->regulators; + + /* Only frequency scaling */ + if (!regulators) { + rcu_read_unlock(); + return _generic_set_opp_clk_only(dev, clk, old_freq, freq); }
+ data = opp_table->set_opp_data; + data->regulators = regulators; + data->regulator_count = opp_table->regulator_count; + data->clk = clk; + + data->old_opp.rate = old_freq; + size = sizeof(*opp->supplies) * opp_table->regulator_count; if (IS_ERR(old_opp)) - old_supply.u_volt = 0; + memset(data->old_opp.supplies, 0, size); else - memcpy(&old_supply, old_opp->supplies, sizeof(old_supply)); + memcpy(data->old_opp.supplies, old_opp->supplies, size);
- memcpy(&new_supply, opp->supplies, sizeof(new_supply)); + data->new_opp.rate = freq; + memcpy(data->new_opp.supplies, opp->supplies, size);
rcu_read_unlock();
- /* Scaling up? Scale voltage before frequency */ - if (freq > old_freq) { - ret = _set_opp_voltage(dev, reg, &new_supply); - if (ret) - goto restore_voltage; - } - - /* Change frequency */ - - dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", - __func__, old_freq, freq); - - ret = clk_set_rate(clk, freq); - if (ret) { - dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, - ret); - goto restore_voltage; - } - - /* Scaling down? Scale voltage after frequency */ - if (freq < old_freq) { - ret = _set_opp_voltage(dev, reg, &new_supply); - if (ret) - goto restore_freq; - } - - return 0; - -restore_freq: - if (clk_set_rate(clk, old_freq)) - dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", - __func__, old_freq); -restore_voltage: - /* This shouldn't harm even if the voltages weren't updated earlier */ - if (old_supply.u_volt) - _set_opp_voltage(dev, reg, &old_supply); - - return ret; + return _generic_set_opp(dev, data); } EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
@@ -1354,6 +1388,38 @@ void dev_pm_opp_put_prop_name(struct device *dev) } EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
+static int _allocate_set_opp_data(struct opp_table *opp_table) +{ + struct dev_pm_set_opp_data *data; + int len, count = opp_table->regulator_count; + + if (WARN_ON(!count)) + return -EINVAL; + + /* space for set_opp_data */ + len = sizeof(*data); + + /* space for old_opp.supplies and new_opp.supplies */ + len += 2 * sizeof(struct dev_pm_opp_supply) * count; + + data = kzalloc(len, GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->old_opp.supplies = (void *)(data + 1); + data->new_opp.supplies = data->old_opp.supplies + count; + + opp_table->set_opp_data = data; + + return 0; +} + +static void _free_set_opp_data(struct opp_table *opp_table) +{ + kfree(opp_table->set_opp_data); + opp_table->set_opp_data = NULL; +} + /** * dev_pm_opp_set_regulators() - Set regulator names for the device * @dev: Device for which regulator name is being set. @@ -1420,6 +1486,11 @@ int dev_pm_opp_set_regulators(struct device *dev, const char * const names[],
opp_table->regulator_count = count;
+ /* Allocate block only once to pass to ->set_rate() */ + ret = _allocate_set_opp_data(opp_table); + if (ret) + goto free_regulators; + mutex_unlock(&opp_table_lock); return 0;
@@ -1429,6 +1500,7 @@ int dev_pm_opp_set_regulators(struct device *dev, const char * const names[],
kfree(opp_table->regulators); opp_table->regulators = NULL; + opp_table->regulator_count = 0; err: _remove_opp_table(opp_table); unlock: @@ -1474,6 +1546,8 @@ void dev_pm_opp_put_regulators(struct device *dev) for (i = opp_table->regulator_count - 1; i >= 0; i--) regulator_put(opp_table->regulators[i]);
+ _free_set_opp_data(opp_table); + kfree(opp_table->regulators); opp_table->regulators = NULL; opp_table->regulator_count = 0; diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h index d5f09ee90347..26bc6c1b8c60 100644 --- a/drivers/base/power/opp/opp.h +++ b/drivers/base/power/opp/opp.h @@ -178,6 +178,8 @@ struct opp_table { struct regulator **regulators; unsigned int regulator_count;
+ struct dev_pm_set_opp_data *set_opp_data; + #ifdef CONFIG_DEBUG_FS struct dentry *dentry; char dentry_name[NAME_MAX]; diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 27eea9bfc5ed..2969519bf5f7 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -17,6 +17,8 @@ #include <linux/err.h> #include <linux/notifier.h>
+struct clk; +struct regulator; struct dev_pm_opp; struct device;
@@ -40,6 +42,37 @@ struct dev_pm_opp_supply { unsigned long u_amp; };
+/** + * struct dev_pm_opp_info - OPP freq/voltage/current values + * @rate: Target clk rate in hz + * @supplies: Array of voltage/current values for all power supplies + * + * This structure stores the freq/voltage/current values for a single OPP. + */ +struct dev_pm_opp_info { + unsigned long rate; + struct dev_pm_opp_supply *supplies; +}; + +/** + * struct dev_pm_set_opp_data - Set OPP data + * @old_opp: Old OPP info + * @new_opp: New OPP info + * @regulators: Array of regulator pointers + * @regulator_count: Number of regulators + * @clk: Pointer to clk + * + * This structure contains all information required for setting an OPP. + */ +struct dev_pm_set_opp_data { + struct dev_pm_opp_info old_opp; + struct dev_pm_opp_info new_opp; + + struct regulator **regulators; + unsigned int regulator_count; + struct clk *clk; +}; + #if defined(CONFIG_PM_OPP)
unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);