diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.9/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.9/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/target/linux/ipq806x/patches-4.9/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch b/target/linux/ipq806x/patches-4.9/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch deleted file mode 100644 index e2a4eed..0000000 --- a/target/linux/ipq806x/patches-4.9/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch +++ /dev/null @@ -1,147 +0,0 @@ -From c949f08cf20fe82971fbdb4015daa38210da492e Mon Sep 17 00:00:00 2001 -From: Stephen Boyd <sboyd@codeaurora.org> -Date: Fri, 18 Sep 2015 17:52:06 -0700 -Subject: [PATCH 49/69] PM / OPP: Support adjusting OPP voltages at runtime - -On some SoCs the Adaptive Voltage Scaling (AVS) technique is -employed to optimize the operating voltage of a device. At a -given frequency, the hardware monitors dynamic factors and either -makes a suggestion for how much to adjust a voltage for the -current frequency, or it automatically adjusts the voltage -without software intervention. Add an API to the OPP library for -the former case, so that AVS type devices can update the voltages -for an OPP when the hardware determines the voltage should -change. The assumption is that drivers like CPUfreq or devfreq -will register for the OPP notifiers and adjust the voltage -according to suggestions that AVS makes. - -Cc: Nishanth Menon <nm@ti.com> -Acked-by: Viresh Kumar <viresh.kumar@linaro.org> -Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> -Acked-by: Viresh Kumar <viresh.kumar@linaro.org> -Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> ---- - drivers/base/power/opp/core.c | 77 +++++++++++++++++++++++++++++++++++++++++++ - include/linux/pm_opp.h | 11 +++++++ - 2 files changed, 88 insertions(+) - ---- a/drivers/base/power/opp/core.c -+++ b/drivers/base/power/opp/core.c -@@ -1521,6 +1521,83 @@ unlock: - } - - /** -+ * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP -+ * @dev: device for which we do this operation -+ * @freq: OPP frequency to adjust voltage of -+ * @u_volt: new OPP voltage -+ * -+ * Change the voltage of an OPP with an RCU operation. -+ * -+ * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the -+ * copy operation, returns 0 if no modifcation was done OR modification was -+ * successful. -+ * -+ * Locking: The internal device_opp and opp structures are RCU protected. -+ * Hence this function internally uses RCU updater strategy with mutex locks to -+ * keep the integrity of the internal data structures. Callers should ensure -+ * that this function is *NOT* called under RCU protection or in contexts where -+ * mutex locking or synchronize_rcu() blocking calls cannot be used. -+ */ -+int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, -+ unsigned long u_volt) -+{ -+ struct opp_table *opp_table; -+ struct dev_pm_opp *new_opp, *tmp_opp, *opp = ERR_PTR(-ENODEV); -+ int r = 0; -+ -+ /* keep the node allocated */ -+ new_opp = kmalloc(sizeof(*new_opp), GFP_KERNEL); -+ if (!new_opp) -+ return -ENOMEM; -+ -+ mutex_lock(&opp_table_lock); -+ -+ /* Find the opp_table */ -+ opp_table = _find_opp_table(dev); -+ if (IS_ERR(opp_table)) { -+ r = PTR_ERR(opp_table); -+ dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); -+ goto unlock; -+ } -+ -+ /* Do we have the frequency? */ -+ list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { -+ if (tmp_opp->rate == freq) { -+ opp = tmp_opp; -+ break; -+ } -+ } -+ if (IS_ERR(opp)) { -+ r = PTR_ERR(opp); -+ goto unlock; -+ } -+ -+ /* Is update really needed? */ -+ if (opp->u_volt == u_volt) -+ goto unlock; -+ /* copy the old data over */ -+ *new_opp = *opp; -+ -+ /* plug in new node */ -+ new_opp->u_volt = u_volt; -+ -+ list_replace_rcu(&opp->node, &new_opp->node); -+ mutex_unlock(&opp_table_lock); -+ call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu); -+ -+ /* Notify the change of the OPP */ -+ srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADJUST_VOLTAGE, -+ new_opp); -+ -+ return 0; -+ -+unlock: -+ mutex_unlock(&opp_table_lock); -+ kfree(new_opp); -+ return r; -+} -+ -+/** - * dev_pm_opp_enable() - Enable a specific OPP - * @dev: device for which we do this operation - * @freq: OPP frequency to enable ---- a/include/linux/pm_opp.h -+++ b/include/linux/pm_opp.h -@@ -23,6 +23,7 @@ struct opp_table; - - enum dev_pm_opp_event { - OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE, -+ OPP_EVENT_ADJUST_VOLTAGE, - }; - - #if defined(CONFIG_PM_OPP) -@@ -53,6 +54,9 @@ int dev_pm_opp_add(struct device *dev, u - unsigned long u_volt); - void dev_pm_opp_remove(struct device *dev, unsigned long freq); - -+int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, -+ unsigned long u_volt); -+ - int dev_pm_opp_enable(struct device *dev, unsigned long freq); - - int dev_pm_opp_disable(struct device *dev, unsigned long freq); -@@ -139,6 +143,13 @@ static inline void dev_pm_opp_remove(str - { - } - -+static inline int -+dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, -+ unsigned long u_volt) -+{ -+ return 0; -+} -+ - static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq) - { - return 0; |