diff options
Diffstat (limited to 'target/linux/ipq806x/patches-5.10/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-5.10/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-5.10/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch b/target/linux/ipq806x/patches-5.10/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch new file mode 100644 index 0000000000..9efbd583b4 --- /dev/null +++ b/target/linux/ipq806x/patches-5.10/0049-PM-OPP-Support-adjusting-OPP-voltages-at-runtime.patch @@ -0,0 +1,153 @@ +From: Sylwester Nawrocki <s.nawrocki@samsung.com> +To: krzk@kernel.org, vireshk@kernel.org, robh+dt@kernel.org +Cc: sboyd@kernel.org, roger.lu@mediatek.com, + linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, + linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, + b.zolnierkie@samsung.com, m.szyprowski@samsung.com, + Stephen Boyd <sboyd@codeaurora.org>, + Sylwester Nawrocki <s.nawrocki@samsung.com> +Subject: [PATCH v5 1/4] PM / OPP: Support adjusting OPP voltages at runtime +Date: Wed, 16 Oct 2019 16:57:53 +0200 +Message-ID: <20191016145756.16004-2-s.nawrocki@samsung.com> (raw) +In-Reply-To: <20191016145756.16004-1-s.nawrocki@samsung.com> + +From: Stephen Boyd <sboyd@codeaurora.org> + +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. + +This patch is derived from [1] submitted by Stephen. +[1] https://lore.kernel.org/patchwork/patch/599279/ + +Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> +Signed-off-by: Roger Lu <roger.lu@mediatek.com> +[s.nawrocki@samsung.com: added handling of OPP min/max voltage] +Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> +--- + drivers/opp/core.c | 69 ++++++++++++++++++++++++++++++++++++++++++ + include/linux/pm_opp.h | 13 ++++++++ + 2 files changed, 82 insertions(+) + +--- a/drivers/opp/core.c ++++ b/drivers/opp/core.c +@@ -2102,6 +2102,75 @@ put_table: + } + + /** ++ * 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 target voltage ++ * @u_volt_min: new OPP min voltage ++ * @u_volt_max: new OPP max voltage ++ * ++ * 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. ++ */ ++int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, ++ unsigned long u_volt, unsigned long u_volt_min, ++ unsigned long u_volt_max) ++ ++{ ++ struct opp_table *opp_table; ++ struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); ++ int r = 0; ++ ++ /* 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); ++ return r; ++ } ++ ++ mutex_lock(&opp_table->lock); ++ ++ /* 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 adjust_unlock; ++ } ++ ++ /* Is update really needed? */ ++ if (opp->supplies->u_volt == u_volt) ++ goto adjust_unlock; ++ ++ opp->supplies->u_volt = u_volt; ++ opp->supplies->u_volt_min = u_volt_min; ++ opp->supplies->u_volt_max = u_volt_max; ++ ++ dev_pm_opp_get(opp); ++ mutex_unlock(&opp_table->lock); ++ ++ /* Notify the voltage change of the OPP */ ++ blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE, ++ opp); ++ ++ dev_pm_opp_put(opp); ++ goto adjust_put_table; ++ ++adjust_unlock: ++ mutex_unlock(&opp_table->lock); ++adjust_put_table: ++ dev_pm_opp_put_opp_table(opp_table); ++ 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 +@@ -22,6 +22,7 @@ struct opp_table; + + enum dev_pm_opp_event { + OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE, ++ OPP_EVENT_ADJUST_VOLTAGE, + }; + + /** +@@ -113,6 +114,10 @@ int dev_pm_opp_add(struct device *dev, u + void dev_pm_opp_remove(struct device *dev, unsigned long freq); + void dev_pm_opp_remove_all_dynamic(struct device *dev); + ++int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, ++ unsigned long u_volt, unsigned long u_volt_min, ++ unsigned long u_volt_max); ++ + int dev_pm_opp_enable(struct device *dev, unsigned long freq); + + int dev_pm_opp_disable(struct device *dev, unsigned long freq); +@@ -242,6 +247,14 @@ static inline void dev_pm_opp_remove_all + { + } + ++static inline int ++dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, ++ unsigned long u_volt, unsigned long u_volt_min, ++ unsigned long u_volt_max) ++{ ++ return 0; ++} ++ + static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq) + { + return 0; |