Merge branch 'pm-devfreq'
* pm-devfreq: (26 commits) PM / devfreq: tegra30: Tune up MCCPU boost-down coefficient PM / devfreq: tegra30: Support variable polling interval PM / devfreq: Add new interrupt_driven flag for governors PM / devfreq: tegra30: Use kHz units for dependency threshold PM / devfreq: tegra30: Disable consecutive interrupts when appropriate PM / devfreq: tegra30: Don't enable already enabled consecutive interrupts PM / devfreq: tegra30: Include appropriate header PM / devfreq: tegra30: Constify structs PM / devfreq: tegra30: Don't enable consecutive-down interrupt on startup PM / devfreq: tegra30: Reset boosting on startup PM / devfreq: tegra30: Move clk-notifier's registration to governor's start PM / devfreq: tegra30: Use CPUFreq notifier PM / devfreq: tegra30: Use kHz units uniformly in the code PM / devfreq: tegra30: Fix integer overflow on CPU's freq max out PM / devfreq: tegra30: Drop write-barrier PM / devfreq: tegra30: Handle possible round-rate error PM / devfreq: tegra30: Keep interrupt disabled while governor is stopped PM / devfreq: tegra30: Change irq type to unsigned int PM / devfreq: exynos-ppmu: remove useless assignment PM / devfreq: Lock devfreq in trans_stat_show ...
This commit is contained in:
Rafael J. Wysocki
commit
fa6a599eb3
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@ -10,14 +10,23 @@ The Exynos PPMU driver uses the devfreq-event class to provide event data
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to various devfreq devices. The devfreq devices would use the event data when
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derterming the current state of each IP.
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Required properties:
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Required properties for PPMU device:
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- compatible: Should be "samsung,exynos-ppmu" or "samsung,exynos-ppmu-v2.
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- reg: physical base address of each PPMU and length of memory mapped region.
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Optional properties:
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Optional properties for PPMU device:
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- clock-names : the name of clock used by the PPMU, "ppmu"
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- clocks : phandles for clock specified in "clock-names" property
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Required properties for 'events' child node of PPMU device:
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- event-name : the unique event name among PPMU device
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Optional properties for 'events' child node of PPMU device:
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- event-data-type : Define the type of data which shell be counted
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by the counter. You can check include/dt-bindings/pmu/exynos_ppmu.h for
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all possible type, i.e. count read requests, count write data in bytes,
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etc. This field is optional and when it is missing, the driver code
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will use default data type.
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Example1 : PPMUv1 nodes in exynos3250.dtsi are listed below.
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ppmu_dmc0: ppmu_dmc0@106a0000 {
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@ -145,3 +154,16 @@ Example3 : PPMUv2 nodes in exynos5433.dtsi are listed below.
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reg = <0x104d0000 0x2000>;
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status = "disabled";
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};
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Example4 : 'event-data-type' in exynos4412-ppmu-common.dtsi are listed below.
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&ppmu_dmc0 {
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status = "okay";
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events {
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ppmu_dmc0_3: ppmu-event3-dmc0 {
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event-name = "ppmu-event3-dmc0";
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event-data-type = <(PPMU_RO_DATA_CNT |
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PPMU_WO_DATA_CNT)>;
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};
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};
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};
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@ -50,8 +50,6 @@ Required properties only for passive bus device:
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Optional properties only for parent bus device:
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- exynos,saturation-ratio: the percentage value which is used to calibrate
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the performance count against total cycle count.
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- exynos,voltage-tolerance: the percentage value for bus voltage tolerance
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which is used to calculate the max voltage.
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Detailed correlation between sub-blocks and power line according to Exynos SoC:
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- In case of Exynos3250, there are two power line as following:
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@ -3532,7 +3532,7 @@ BUS FREQUENCY DRIVER FOR SAMSUNG EXYNOS
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M: Chanwoo Choi <cw00.choi@samsung.com>
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L: linux-pm@vger.kernel.org
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L: linux-samsung-soc@vger.kernel.org
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git
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S: Maintained
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F: drivers/devfreq/exynos-bus.c
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F: Documentation/devicetree/bindings/devfreq/exynos-bus.txt
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@ -4760,9 +4760,9 @@ F: include/linux/devcoredump.h
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DEVICE FREQUENCY (DEVFREQ)
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M: MyungJoo Ham <myungjoo.ham@samsung.com>
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M: Kyungmin Park <kyungmin.park@samsung.com>
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R: Chanwoo Choi <cw00.choi@samsung.com>
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M: Chanwoo Choi <cw00.choi@samsung.com>
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L: linux-pm@vger.kernel.org
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git
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S: Maintained
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F: drivers/devfreq/
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F: include/linux/devfreq.h
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@ -4772,10 +4772,11 @@ F: include/trace/events/devfreq.h
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DEVICE FREQUENCY EVENT (DEVFREQ-EVENT)
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M: Chanwoo Choi <cw00.choi@samsung.com>
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L: linux-pm@vger.kernel.org
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git
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S: Supported
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F: drivers/devfreq/event/
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F: drivers/devfreq/devfreq-event.c
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F: include/dt-bindings/pmu/exynos_ppmu.h
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F: include/linux/devfreq-event.h
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F: Documentation/devicetree/bindings/devfreq/event/
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@ -160,6 +160,7 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
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int lev, prev_lev, ret = 0;
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unsigned long cur_time;
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lockdep_assert_held(&devfreq->lock);
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cur_time = jiffies;
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/* Immediately exit if previous_freq is not initialized yet. */
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@ -409,6 +410,9 @@ static void devfreq_monitor(struct work_struct *work)
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*/
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void devfreq_monitor_start(struct devfreq *devfreq)
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{
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if (devfreq->governor->interrupt_driven)
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return;
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INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor);
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if (devfreq->profile->polling_ms)
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queue_delayed_work(devfreq_wq, &devfreq->work,
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@ -426,6 +430,9 @@ EXPORT_SYMBOL(devfreq_monitor_start);
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*/
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void devfreq_monitor_stop(struct devfreq *devfreq)
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{
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if (devfreq->governor->interrupt_driven)
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return;
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cancel_delayed_work_sync(&devfreq->work);
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}
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EXPORT_SYMBOL(devfreq_monitor_stop);
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@ -453,6 +460,10 @@ void devfreq_monitor_suspend(struct devfreq *devfreq)
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devfreq_update_status(devfreq, devfreq->previous_freq);
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devfreq->stop_polling = true;
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mutex_unlock(&devfreq->lock);
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if (devfreq->governor->interrupt_driven)
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return;
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cancel_delayed_work_sync(&devfreq->work);
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}
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EXPORT_SYMBOL(devfreq_monitor_suspend);
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@ -473,11 +484,15 @@ void devfreq_monitor_resume(struct devfreq *devfreq)
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if (!devfreq->stop_polling)
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goto out;
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if (devfreq->governor->interrupt_driven)
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goto out_update;
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if (!delayed_work_pending(&devfreq->work) &&
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devfreq->profile->polling_ms)
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queue_delayed_work(devfreq_wq, &devfreq->work,
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msecs_to_jiffies(devfreq->profile->polling_ms));
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out_update:
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devfreq->last_stat_updated = jiffies;
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devfreq->stop_polling = false;
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@ -509,6 +524,9 @@ void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay)
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if (devfreq->stop_polling)
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goto out;
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if (devfreq->governor->interrupt_driven)
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goto out;
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/* if new delay is zero, stop polling */
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if (!new_delay) {
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mutex_unlock(&devfreq->lock);
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@ -625,7 +643,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
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devfreq = find_device_devfreq(dev);
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mutex_unlock(&devfreq_list_lock);
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if (!IS_ERR(devfreq)) {
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dev_err(dev, "%s: Unable to create devfreq for the device.\n",
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dev_err(dev, "%s: devfreq device already exists!\n",
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__func__);
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err = -EINVAL;
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goto err_out;
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@ -1195,7 +1213,7 @@ static ssize_t available_governors_show(struct device *d,
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* The devfreq with immutable governor (e.g., passive) shows
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* only own governor.
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*/
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if (df->governor->immutable) {
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if (df->governor && df->governor->immutable) {
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count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
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"%s ", df->governor_name);
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/*
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@ -1397,12 +1415,17 @@ static ssize_t trans_stat_show(struct device *dev,
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int i, j;
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unsigned int max_state = devfreq->profile->max_state;
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if (!devfreq->stop_polling &&
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devfreq_update_status(devfreq, devfreq->previous_freq))
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return 0;
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if (max_state == 0)
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return sprintf(buf, "Not Supported.\n");
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mutex_lock(&devfreq->lock);
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if (!devfreq->stop_polling &&
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devfreq_update_status(devfreq, devfreq->previous_freq)) {
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mutex_unlock(&devfreq->lock);
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return 0;
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}
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mutex_unlock(&devfreq->lock);
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len = sprintf(buf, " From : To\n");
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len += sprintf(buf + len, " :");
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for (i = 0; i < max_state; i++)
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@ -673,7 +673,6 @@ static int exynos_ppmu_probe(struct platform_device *pdev)
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for (i = 0; i < info->num_events; i++) {
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edev[i] = devm_devfreq_event_add_edev(&pdev->dev, &desc[i]);
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if (IS_ERR(edev[i])) {
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ret = PTR_ERR(edev[i]);
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dev_err(&pdev->dev,
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"failed to add devfreq-event device\n");
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return PTR_ERR(edev[i]);
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@ -31,6 +31,8 @@
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* @name: Governor's name
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* @immutable: Immutable flag for governor. If the value is 1,
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* this govenror is never changeable to other governor.
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* @interrupt_driven: Devfreq core won't schedule polling work for this
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* governor if value is set to 1.
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* @get_target_freq: Returns desired operating frequency for the device.
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* Basically, get_target_freq will run
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* devfreq_dev_profile.get_dev_status() to get the
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@ -49,6 +51,7 @@ struct devfreq_governor {
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const char name[DEVFREQ_NAME_LEN];
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const unsigned int immutable;
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const unsigned int interrupt_driven;
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int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
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int (*event_handler)(struct devfreq *devfreq,
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unsigned int event, void *data);
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@ -11,11 +11,13 @@
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#include <linux/devfreq.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_opp.h>
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#include <linux/reset.h>
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#include <linux/workqueue.h>
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#include "governor.h"
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@ -33,6 +35,8 @@
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#define ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN BIT(30)
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#define ACTMON_DEV_CTRL_ENB BIT(31)
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#define ACTMON_DEV_CTRL_STOP 0x00000000
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#define ACTMON_DEV_UPPER_WMARK 0x4
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#define ACTMON_DEV_LOWER_WMARK 0x8
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#define ACTMON_DEV_INIT_AVG 0xc
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@ -68,6 +72,8 @@
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#define KHZ 1000
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#define KHZ_MAX (ULONG_MAX / KHZ)
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/* Assume that the bus is saturated if the utilization is 25% */
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#define BUS_SATURATION_RATIO 25
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@ -90,9 +96,10 @@ struct tegra_devfreq_device_config {
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unsigned int boost_down_threshold;
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/*
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* Threshold of activity (cycles) below which the CPU frequency isn't
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* to be taken into account. This is to avoid increasing the EMC
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* frequency when the CPU is very busy but not accessing the bus often.
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* Threshold of activity (cycles translated to kHz) below which the
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* CPU frequency isn't to be taken into account. This is to avoid
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* increasing the EMC frequency when the CPU is very busy but not
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* accessing the bus often.
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*/
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u32 avg_dependency_threshold;
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};
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@ -102,7 +109,7 @@ enum tegra_actmon_device {
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MCCPU,
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};
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static struct tegra_devfreq_device_config actmon_device_configs[] = {
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static const struct tegra_devfreq_device_config actmon_device_configs[] = {
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{
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/* MCALL: All memory accesses (including from the CPUs) */
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.offset = 0x1c0,
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@ -117,10 +124,10 @@ static struct tegra_devfreq_device_config actmon_device_configs[] = {
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.offset = 0x200,
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.irq_mask = 1 << 25,
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.boost_up_coeff = 800,
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.boost_down_coeff = 90,
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.boost_down_coeff = 40,
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.boost_up_threshold = 27,
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.boost_down_threshold = 10,
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.avg_dependency_threshold = 50000,
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.avg_dependency_threshold = 16000, /* 16MHz in kHz units */
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},
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};
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@ -156,11 +163,16 @@ struct tegra_devfreq {
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struct clk *emc_clock;
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unsigned long max_freq;
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unsigned long cur_freq;
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struct notifier_block rate_change_nb;
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struct notifier_block clk_rate_change_nb;
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struct delayed_work cpufreq_update_work;
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struct notifier_block cpu_rate_change_nb;
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struct tegra_devfreq_device devices[ARRAY_SIZE(actmon_device_configs)];
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|
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int irq;
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unsigned int irq;
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|
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bool started;
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};
|
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struct tegra_actmon_emc_ratio {
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@ -168,8 +180,8 @@ struct tegra_actmon_emc_ratio {
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unsigned long emc_freq;
|
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};
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static struct tegra_actmon_emc_ratio actmon_emc_ratios[] = {
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{ 1400000, ULONG_MAX },
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static const struct tegra_actmon_emc_ratio actmon_emc_ratios[] = {
|
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{ 1400000, KHZ_MAX },
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{ 1200000, 750000 },
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{ 1100000, 600000 },
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{ 1000000, 500000 },
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|
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@ -199,18 +211,26 @@ static void device_writel(struct tegra_devfreq_device *dev, u32 val,
|
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writel_relaxed(val, dev->regs + offset);
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}
|
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|
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static unsigned long do_percent(unsigned long val, unsigned int pct)
|
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static unsigned long do_percent(unsigned long long val, unsigned int pct)
|
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{
|
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return val * pct / 100;
|
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val = val * pct;
|
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do_div(val, 100);
|
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|
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/*
|
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* High freq + high boosting percent + large polling interval are
|
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* resulting in integer overflow when watermarks are calculated.
|
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*/
|
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return min_t(u64, val, U32_MAX);
|
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}
|
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|
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static void tegra_devfreq_update_avg_wmark(struct tegra_devfreq *tegra,
|
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struct tegra_devfreq_device *dev)
|
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{
|
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u32 avg = dev->avg_count;
|
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u32 avg_band_freq = tegra->max_freq * ACTMON_DEFAULT_AVG_BAND / KHZ;
|
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u32 band = avg_band_freq * ACTMON_SAMPLING_PERIOD;
|
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u32 band = avg_band_freq * tegra->devfreq->profile->polling_ms;
|
||||
u32 avg;
|
||||
|
||||
avg = min(dev->avg_count, U32_MAX - band);
|
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device_writel(dev, avg + band, ACTMON_DEV_AVG_UPPER_WMARK);
|
||||
|
||||
avg = max(dev->avg_count, band);
|
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|
|
@ -220,7 +240,7 @@ static void tegra_devfreq_update_avg_wmark(struct tegra_devfreq *tegra,
|
|||
static void tegra_devfreq_update_wmark(struct tegra_devfreq *tegra,
|
||||
struct tegra_devfreq_device *dev)
|
||||
{
|
||||
u32 val = tegra->cur_freq * ACTMON_SAMPLING_PERIOD;
|
||||
u32 val = tegra->cur_freq * tegra->devfreq->profile->polling_ms;
|
||||
|
||||
device_writel(dev, do_percent(val, dev->config->boost_up_threshold),
|
||||
ACTMON_DEV_UPPER_WMARK);
|
||||
|
|
@ -229,12 +249,6 @@ static void tegra_devfreq_update_wmark(struct tegra_devfreq *tegra,
|
|||
ACTMON_DEV_LOWER_WMARK);
|
||||
}
|
||||
|
||||
static void actmon_write_barrier(struct tegra_devfreq *tegra)
|
||||
{
|
||||
/* ensure the update has reached the ACTMON */
|
||||
readl(tegra->regs + ACTMON_GLB_STATUS);
|
||||
}
|
||||
|
||||
static void actmon_isr_device(struct tegra_devfreq *tegra,
|
||||
struct tegra_devfreq_device *dev)
|
||||
{
|
||||
|
|
@ -256,10 +270,10 @@ static void actmon_isr_device(struct tegra_devfreq *tegra,
|
|||
|
||||
dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
|
||||
|
||||
if (dev->boost_freq >= tegra->max_freq)
|
||||
if (dev->boost_freq >= tegra->max_freq) {
|
||||
dev_ctrl &= ~ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
|
||||
dev->boost_freq = tegra->max_freq;
|
||||
else
|
||||
dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
|
||||
}
|
||||
} else if (intr_status & ACTMON_DEV_INTR_CONSECUTIVE_LOWER) {
|
||||
/*
|
||||
* new_boost = old_boost * down_coef
|
||||
|
|
@ -270,31 +284,22 @@ static void actmon_isr_device(struct tegra_devfreq *tegra,
|
|||
|
||||
dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
|
||||
|
||||
if (dev->boost_freq < (ACTMON_BOOST_FREQ_STEP >> 1))
|
||||
dev->boost_freq = 0;
|
||||
else
|
||||
dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
|
||||
}
|
||||
|
||||
if (dev->config->avg_dependency_threshold) {
|
||||
if (dev->avg_count >= dev->config->avg_dependency_threshold)
|
||||
dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
|
||||
else if (dev->boost_freq == 0)
|
||||
if (dev->boost_freq < (ACTMON_BOOST_FREQ_STEP >> 1)) {
|
||||
dev_ctrl &= ~ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
|
||||
dev->boost_freq = 0;
|
||||
}
|
||||
}
|
||||
|
||||
device_writel(dev, dev_ctrl, ACTMON_DEV_CTRL);
|
||||
|
||||
device_writel(dev, ACTMON_INTR_STATUS_CLEAR, ACTMON_DEV_INTR_STATUS);
|
||||
|
||||
actmon_write_barrier(tegra);
|
||||
}
|
||||
|
||||
static unsigned long actmon_cpu_to_emc_rate(struct tegra_devfreq *tegra,
|
||||
unsigned long cpu_freq)
|
||||
{
|
||||
unsigned int i;
|
||||
struct tegra_actmon_emc_ratio *ratio = actmon_emc_ratios;
|
||||
const struct tegra_actmon_emc_ratio *ratio = actmon_emc_ratios;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(actmon_emc_ratios); i++, ratio++) {
|
||||
if (cpu_freq >= ratio->cpu_freq) {
|
||||
|
|
@ -308,25 +313,37 @@ static unsigned long actmon_cpu_to_emc_rate(struct tegra_devfreq *tegra,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static unsigned long actmon_device_target_freq(struct tegra_devfreq *tegra,
|
||||
struct tegra_devfreq_device *dev)
|
||||
{
|
||||
unsigned int avg_sustain_coef;
|
||||
unsigned long target_freq;
|
||||
|
||||
target_freq = dev->avg_count / tegra->devfreq->profile->polling_ms;
|
||||
avg_sustain_coef = 100 * 100 / dev->config->boost_up_threshold;
|
||||
target_freq = do_percent(target_freq, avg_sustain_coef);
|
||||
|
||||
return target_freq;
|
||||
}
|
||||
|
||||
static void actmon_update_target(struct tegra_devfreq *tegra,
|
||||
struct tegra_devfreq_device *dev)
|
||||
{
|
||||
unsigned long cpu_freq = 0;
|
||||
unsigned long static_cpu_emc_freq = 0;
|
||||
unsigned int avg_sustain_coef;
|
||||
|
||||
if (dev->config->avg_dependency_threshold) {
|
||||
cpu_freq = cpufreq_get(0);
|
||||
dev->target_freq = actmon_device_target_freq(tegra, dev);
|
||||
|
||||
if (dev->config->avg_dependency_threshold &&
|
||||
dev->config->avg_dependency_threshold <= dev->target_freq) {
|
||||
cpu_freq = cpufreq_quick_get(0);
|
||||
static_cpu_emc_freq = actmon_cpu_to_emc_rate(tegra, cpu_freq);
|
||||
}
|
||||
|
||||
dev->target_freq = dev->avg_count / ACTMON_SAMPLING_PERIOD;
|
||||
avg_sustain_coef = 100 * 100 / dev->config->boost_up_threshold;
|
||||
dev->target_freq = do_percent(dev->target_freq, avg_sustain_coef);
|
||||
dev->target_freq += dev->boost_freq;
|
||||
|
||||
if (dev->avg_count >= dev->config->avg_dependency_threshold)
|
||||
dev->target_freq += dev->boost_freq;
|
||||
dev->target_freq = max(dev->target_freq, static_cpu_emc_freq);
|
||||
} else {
|
||||
dev->target_freq += dev->boost_freq;
|
||||
}
|
||||
}
|
||||
|
||||
static irqreturn_t actmon_thread_isr(int irq, void *data)
|
||||
|
|
@ -354,8 +371,8 @@ static irqreturn_t actmon_thread_isr(int irq, void *data)
|
|||
return handled ? IRQ_HANDLED : IRQ_NONE;
|
||||
}
|
||||
|
||||
static int tegra_actmon_rate_notify_cb(struct notifier_block *nb,
|
||||
unsigned long action, void *ptr)
|
||||
static int tegra_actmon_clk_notify_cb(struct notifier_block *nb,
|
||||
unsigned long action, void *ptr)
|
||||
{
|
||||
struct clk_notifier_data *data = ptr;
|
||||
struct tegra_devfreq *tegra;
|
||||
|
|
@ -365,7 +382,7 @@ static int tegra_actmon_rate_notify_cb(struct notifier_block *nb,
|
|||
if (action != POST_RATE_CHANGE)
|
||||
return NOTIFY_OK;
|
||||
|
||||
tegra = container_of(nb, struct tegra_devfreq, rate_change_nb);
|
||||
tegra = container_of(nb, struct tegra_devfreq, clk_rate_change_nb);
|
||||
|
||||
tegra->cur_freq = data->new_rate / KHZ;
|
||||
|
||||
|
|
@ -375,7 +392,79 @@ static int tegra_actmon_rate_notify_cb(struct notifier_block *nb,
|
|||
tegra_devfreq_update_wmark(tegra, dev);
|
||||
}
|
||||
|
||||
actmon_write_barrier(tegra);
|
||||
return NOTIFY_OK;
|
||||
}
|
||||
|
||||
static void tegra_actmon_delayed_update(struct work_struct *work)
|
||||
{
|
||||
struct tegra_devfreq *tegra = container_of(work, struct tegra_devfreq,
|
||||
cpufreq_update_work.work);
|
||||
|
||||
mutex_lock(&tegra->devfreq->lock);
|
||||
update_devfreq(tegra->devfreq);
|
||||
mutex_unlock(&tegra->devfreq->lock);
|
||||
}
|
||||
|
||||
static unsigned long
|
||||
tegra_actmon_cpufreq_contribution(struct tegra_devfreq *tegra,
|
||||
unsigned int cpu_freq)
|
||||
{
|
||||
struct tegra_devfreq_device *actmon_dev = &tegra->devices[MCCPU];
|
||||
unsigned long static_cpu_emc_freq, dev_freq;
|
||||
|
||||
dev_freq = actmon_device_target_freq(tegra, actmon_dev);
|
||||
|
||||
/* check whether CPU's freq is taken into account at all */
|
||||
if (dev_freq < actmon_dev->config->avg_dependency_threshold)
|
||||
return 0;
|
||||
|
||||
static_cpu_emc_freq = actmon_cpu_to_emc_rate(tegra, cpu_freq);
|
||||
|
||||
if (dev_freq >= static_cpu_emc_freq)
|
||||
return 0;
|
||||
|
||||
return static_cpu_emc_freq;
|
||||
}
|
||||
|
||||
static int tegra_actmon_cpu_notify_cb(struct notifier_block *nb,
|
||||
unsigned long action, void *ptr)
|
||||
{
|
||||
struct cpufreq_freqs *freqs = ptr;
|
||||
struct tegra_devfreq *tegra;
|
||||
unsigned long old, new, delay;
|
||||
|
||||
if (action != CPUFREQ_POSTCHANGE)
|
||||
return NOTIFY_OK;
|
||||
|
||||
tegra = container_of(nb, struct tegra_devfreq, cpu_rate_change_nb);
|
||||
|
||||
/*
|
||||
* Quickly check whether CPU frequency should be taken into account
|
||||
* at all, without blocking CPUFreq's core.
|
||||
*/
|
||||
if (mutex_trylock(&tegra->devfreq->lock)) {
|
||||
old = tegra_actmon_cpufreq_contribution(tegra, freqs->old);
|
||||
new = tegra_actmon_cpufreq_contribution(tegra, freqs->new);
|
||||
mutex_unlock(&tegra->devfreq->lock);
|
||||
|
||||
/*
|
||||
* If CPU's frequency shouldn't be taken into account at
|
||||
* the moment, then there is no need to update the devfreq's
|
||||
* state because ISR will re-check CPU's frequency on the
|
||||
* next interrupt.
|
||||
*/
|
||||
if (old == new)
|
||||
return NOTIFY_OK;
|
||||
}
|
||||
|
||||
/*
|
||||
* CPUFreq driver should support CPUFREQ_ASYNC_NOTIFICATION in order
|
||||
* to allow asynchronous notifications. This means we can't block
|
||||
* here for too long, otherwise CPUFreq's core will complain with a
|
||||
* warning splat.
|
||||
*/
|
||||
delay = msecs_to_jiffies(ACTMON_SAMPLING_PERIOD);
|
||||
schedule_delayed_work(&tegra->cpufreq_update_work, delay);
|
||||
|
||||
return NOTIFY_OK;
|
||||
}
|
||||
|
|
@ -385,9 +474,12 @@ static void tegra_actmon_configure_device(struct tegra_devfreq *tegra,
|
|||
{
|
||||
u32 val = 0;
|
||||
|
||||
/* reset boosting on governor's restart */
|
||||
dev->boost_freq = 0;
|
||||
|
||||
dev->target_freq = tegra->cur_freq;
|
||||
|
||||
dev->avg_count = tegra->cur_freq * ACTMON_SAMPLING_PERIOD;
|
||||
dev->avg_count = tegra->cur_freq * tegra->devfreq->profile->polling_ms;
|
||||
device_writel(dev, dev->avg_count, ACTMON_DEV_INIT_AVG);
|
||||
|
||||
tegra_devfreq_update_avg_wmark(tegra, dev);
|
||||
|
|
@ -405,45 +497,116 @@ static void tegra_actmon_configure_device(struct tegra_devfreq *tegra,
|
|||
<< ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_NUM_SHIFT;
|
||||
val |= ACTMON_DEV_CTRL_AVG_ABOVE_WMARK_EN;
|
||||
val |= ACTMON_DEV_CTRL_AVG_BELOW_WMARK_EN;
|
||||
val |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
|
||||
val |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
|
||||
val |= ACTMON_DEV_CTRL_ENB;
|
||||
|
||||
device_writel(dev, val, ACTMON_DEV_CTRL);
|
||||
}
|
||||
|
||||
static void tegra_actmon_start(struct tegra_devfreq *tegra)
|
||||
static void tegra_actmon_stop_devices(struct tegra_devfreq *tegra)
|
||||
{
|
||||
struct tegra_devfreq_device *dev = tegra->devices;
|
||||
unsigned int i;
|
||||
|
||||
disable_irq(tegra->irq);
|
||||
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++, dev++) {
|
||||
device_writel(dev, ACTMON_DEV_CTRL_STOP, ACTMON_DEV_CTRL);
|
||||
device_writel(dev, ACTMON_INTR_STATUS_CLEAR,
|
||||
ACTMON_DEV_INTR_STATUS);
|
||||
}
|
||||
}
|
||||
|
||||
actmon_writel(tegra, ACTMON_SAMPLING_PERIOD - 1,
|
||||
static int tegra_actmon_resume(struct tegra_devfreq *tegra)
|
||||
{
|
||||
unsigned int i;
|
||||
int err;
|
||||
|
||||
if (!tegra->devfreq->profile->polling_ms || !tegra->started)
|
||||
return 0;
|
||||
|
||||
actmon_writel(tegra, tegra->devfreq->profile->polling_ms - 1,
|
||||
ACTMON_GLB_PERIOD_CTRL);
|
||||
|
||||
/*
|
||||
* CLK notifications are needed in order to reconfigure the upper
|
||||
* consecutive watermark in accordance to the actual clock rate
|
||||
* to avoid unnecessary upper interrupts.
|
||||
*/
|
||||
err = clk_notifier_register(tegra->emc_clock,
|
||||
&tegra->clk_rate_change_nb);
|
||||
if (err) {
|
||||
dev_err(tegra->devfreq->dev.parent,
|
||||
"Failed to register rate change notifier\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
tegra->cur_freq = clk_get_rate(tegra->emc_clock) / KHZ;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++)
|
||||
tegra_actmon_configure_device(tegra, &tegra->devices[i]);
|
||||
|
||||
actmon_write_barrier(tegra);
|
||||
/*
|
||||
* We are estimating CPU's memory bandwidth requirement based on
|
||||
* amount of memory accesses and system's load, judging by CPU's
|
||||
* frequency. We also don't want to receive events about CPU's
|
||||
* frequency transaction when governor is stopped, hence notifier
|
||||
* is registered dynamically.
|
||||
*/
|
||||
err = cpufreq_register_notifier(&tegra->cpu_rate_change_nb,
|
||||
CPUFREQ_TRANSITION_NOTIFIER);
|
||||
if (err) {
|
||||
dev_err(tegra->devfreq->dev.parent,
|
||||
"Failed to register rate change notifier: %d\n", err);
|
||||
goto err_stop;
|
||||
}
|
||||
|
||||
enable_irq(tegra->irq);
|
||||
|
||||
return 0;
|
||||
|
||||
err_stop:
|
||||
tegra_actmon_stop_devices(tegra);
|
||||
|
||||
clk_notifier_unregister(tegra->emc_clock, &tegra->clk_rate_change_nb);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int tegra_actmon_start(struct tegra_devfreq *tegra)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
if (!tegra->started) {
|
||||
tegra->started = true;
|
||||
|
||||
ret = tegra_actmon_resume(tegra);
|
||||
if (ret)
|
||||
tegra->started = false;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void tegra_actmon_pause(struct tegra_devfreq *tegra)
|
||||
{
|
||||
if (!tegra->devfreq->profile->polling_ms || !tegra->started)
|
||||
return;
|
||||
|
||||
disable_irq(tegra->irq);
|
||||
|
||||
cpufreq_unregister_notifier(&tegra->cpu_rate_change_nb,
|
||||
CPUFREQ_TRANSITION_NOTIFIER);
|
||||
|
||||
cancel_delayed_work_sync(&tegra->cpufreq_update_work);
|
||||
|
||||
tegra_actmon_stop_devices(tegra);
|
||||
|
||||
clk_notifier_unregister(tegra->emc_clock, &tegra->clk_rate_change_nb);
|
||||
}
|
||||
|
||||
static void tegra_actmon_stop(struct tegra_devfreq *tegra)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
disable_irq(tegra->irq);
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
|
||||
device_writel(&tegra->devices[i], 0x00000000, ACTMON_DEV_CTRL);
|
||||
device_writel(&tegra->devices[i], ACTMON_INTR_STATUS_CLEAR,
|
||||
ACTMON_DEV_INTR_STATUS);
|
||||
}
|
||||
|
||||
actmon_write_barrier(tegra);
|
||||
|
||||
enable_irq(tegra->irq);
|
||||
tegra_actmon_pause(tegra);
|
||||
tegra->started = false;
|
||||
}
|
||||
|
||||
static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
|
||||
|
|
@ -463,7 +626,7 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
|
|||
rate = dev_pm_opp_get_freq(opp);
|
||||
dev_pm_opp_put(opp);
|
||||
|
||||
err = clk_set_min_rate(tegra->emc_clock, rate);
|
||||
err = clk_set_min_rate(tegra->emc_clock, rate * KHZ);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
|
|
@ -492,7 +655,7 @@ static int tegra_devfreq_get_dev_status(struct device *dev,
|
|||
stat->private_data = tegra;
|
||||
|
||||
/* The below are to be used by the other governors */
|
||||
stat->current_frequency = cur_freq * KHZ;
|
||||
stat->current_frequency = cur_freq;
|
||||
|
||||
actmon_dev = &tegra->devices[MCALL];
|
||||
|
||||
|
|
@ -503,7 +666,7 @@ static int tegra_devfreq_get_dev_status(struct device *dev,
|
|||
stat->busy_time *= 100 / BUS_SATURATION_RATIO;
|
||||
|
||||
/* Number of cycles in a sampling period */
|
||||
stat->total_time = ACTMON_SAMPLING_PERIOD * cur_freq;
|
||||
stat->total_time = tegra->devfreq->profile->polling_ms * cur_freq;
|
||||
|
||||
stat->busy_time = min(stat->busy_time, stat->total_time);
|
||||
|
||||
|
|
@ -511,7 +674,7 @@ static int tegra_devfreq_get_dev_status(struct device *dev,
|
|||
}
|
||||
|
||||
static struct devfreq_dev_profile tegra_devfreq_profile = {
|
||||
.polling_ms = 0,
|
||||
.polling_ms = ACTMON_SAMPLING_PERIOD,
|
||||
.target = tegra_devfreq_target,
|
||||
.get_dev_status = tegra_devfreq_get_dev_status,
|
||||
};
|
||||
|
|
@ -542,7 +705,7 @@ static int tegra_governor_get_target(struct devfreq *devfreq,
|
|||
target_freq = max(target_freq, dev->target_freq);
|
||||
}
|
||||
|
||||
*freq = target_freq * KHZ;
|
||||
*freq = target_freq;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -551,11 +714,19 @@ static int tegra_governor_event_handler(struct devfreq *devfreq,
|
|||
unsigned int event, void *data)
|
||||
{
|
||||
struct tegra_devfreq *tegra = dev_get_drvdata(devfreq->dev.parent);
|
||||
unsigned int *new_delay = data;
|
||||
int ret = 0;
|
||||
|
||||
/*
|
||||
* Couple devfreq-device with the governor early because it is
|
||||
* needed at the moment of governor's start (used by ISR).
|
||||
*/
|
||||
tegra->devfreq = devfreq;
|
||||
|
||||
switch (event) {
|
||||
case DEVFREQ_GOV_START:
|
||||
devfreq_monitor_start(devfreq);
|
||||
tegra_actmon_start(tegra);
|
||||
ret = tegra_actmon_start(tegra);
|
||||
break;
|
||||
|
||||
case DEVFREQ_GOV_STOP:
|
||||
|
|
@ -563,6 +734,21 @@ static int tegra_governor_event_handler(struct devfreq *devfreq,
|
|||
devfreq_monitor_stop(devfreq);
|
||||
break;
|
||||
|
||||
case DEVFREQ_GOV_INTERVAL:
|
||||
/*
|
||||
* ACTMON hardware supports up to 256 milliseconds for the
|
||||
* sampling period.
|
||||
*/
|
||||
if (*new_delay > 256) {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
tegra_actmon_pause(tegra);
|
||||
devfreq_interval_update(devfreq, new_delay);
|
||||
ret = tegra_actmon_resume(tegra);
|
||||
break;
|
||||
|
||||
case DEVFREQ_GOV_SUSPEND:
|
||||
tegra_actmon_stop(tegra);
|
||||
devfreq_monitor_suspend(devfreq);
|
||||
|
|
@ -570,11 +756,11 @@ static int tegra_governor_event_handler(struct devfreq *devfreq,
|
|||
|
||||
case DEVFREQ_GOV_RESUME:
|
||||
devfreq_monitor_resume(devfreq);
|
||||
tegra_actmon_start(tegra);
|
||||
ret = tegra_actmon_start(tegra);
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct devfreq_governor tegra_devfreq_governor = {
|
||||
|
|
@ -582,14 +768,16 @@ static struct devfreq_governor tegra_devfreq_governor = {
|
|||
.get_target_freq = tegra_governor_get_target,
|
||||
.event_handler = tegra_governor_event_handler,
|
||||
.immutable = true,
|
||||
.interrupt_driven = true,
|
||||
};
|
||||
|
||||
static int tegra_devfreq_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct tegra_devfreq *tegra;
|
||||
struct tegra_devfreq_device *dev;
|
||||
struct tegra_devfreq *tegra;
|
||||
struct devfreq *devfreq;
|
||||
unsigned int i;
|
||||
unsigned long rate;
|
||||
long rate;
|
||||
int err;
|
||||
|
||||
tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
|
||||
|
|
@ -618,12 +806,22 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
|
|||
return PTR_ERR(tegra->emc_clock);
|
||||
}
|
||||
|
||||
tegra->irq = platform_get_irq(pdev, 0);
|
||||
if (tegra->irq < 0) {
|
||||
err = tegra->irq;
|
||||
err = platform_get_irq(pdev, 0);
|
||||
if (err < 0) {
|
||||
dev_err(&pdev->dev, "Failed to get IRQ: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
tegra->irq = err;
|
||||
|
||||
irq_set_status_flags(tegra->irq, IRQ_NOAUTOEN);
|
||||
|
||||
err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,
|
||||
actmon_thread_isr, IRQF_ONESHOT,
|
||||
"tegra-devfreq", tegra);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "Interrupt request failed: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
reset_control_assert(tegra->reset);
|
||||
|
||||
|
|
@ -636,8 +834,13 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
|
|||
|
||||
reset_control_deassert(tegra->reset);
|
||||
|
||||
tegra->max_freq = clk_round_rate(tegra->emc_clock, ULONG_MAX) / KHZ;
|
||||
tegra->cur_freq = clk_get_rate(tegra->emc_clock) / KHZ;
|
||||
rate = clk_round_rate(tegra->emc_clock, ULONG_MAX);
|
||||
if (rate < 0) {
|
||||
dev_err(&pdev->dev, "Failed to round clock rate: %ld\n", rate);
|
||||
return rate;
|
||||
}
|
||||
|
||||
tegra->max_freq = rate / KHZ;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(actmon_device_configs); i++) {
|
||||
dev = tegra->devices + i;
|
||||
|
|
@ -648,7 +851,14 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
|
|||
for (rate = 0; rate <= tegra->max_freq * KHZ; rate++) {
|
||||
rate = clk_round_rate(tegra->emc_clock, rate);
|
||||
|
||||
err = dev_pm_opp_add(&pdev->dev, rate, 0);
|
||||
if (rate < 0) {
|
||||
dev_err(&pdev->dev,
|
||||
"Failed to round clock rate: %ld\n", rate);
|
||||
err = rate;
|
||||
goto remove_opps;
|
||||
}
|
||||
|
||||
err = dev_pm_opp_add(&pdev->dev, rate / KHZ, 0);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "Failed to add OPP: %d\n", err);
|
||||
goto remove_opps;
|
||||
|
|
@ -657,49 +867,33 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
|
|||
|
||||
platform_set_drvdata(pdev, tegra);
|
||||
|
||||
tegra->rate_change_nb.notifier_call = tegra_actmon_rate_notify_cb;
|
||||
err = clk_notifier_register(tegra->emc_clock, &tegra->rate_change_nb);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev,
|
||||
"Failed to register rate change notifier\n");
|
||||
goto remove_opps;
|
||||
}
|
||||
tegra->clk_rate_change_nb.notifier_call = tegra_actmon_clk_notify_cb;
|
||||
tegra->cpu_rate_change_nb.notifier_call = tegra_actmon_cpu_notify_cb;
|
||||
|
||||
INIT_DELAYED_WORK(&tegra->cpufreq_update_work,
|
||||
tegra_actmon_delayed_update);
|
||||
|
||||
err = devfreq_add_governor(&tegra_devfreq_governor);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "Failed to add governor: %d\n", err);
|
||||
goto unreg_notifier;
|
||||
goto remove_opps;
|
||||
}
|
||||
|
||||
tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock);
|
||||
tegra->devfreq = devfreq_add_device(&pdev->dev,
|
||||
&tegra_devfreq_profile,
|
||||
"tegra_actmon",
|
||||
NULL);
|
||||
if (IS_ERR(tegra->devfreq)) {
|
||||
err = PTR_ERR(tegra->devfreq);
|
||||
goto remove_governor;
|
||||
}
|
||||
tegra_devfreq_profile.initial_freq /= KHZ;
|
||||
|
||||
err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,
|
||||
actmon_thread_isr, IRQF_ONESHOT,
|
||||
"tegra-devfreq", tegra);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "Interrupt request failed: %d\n", err);
|
||||
goto remove_devfreq;
|
||||
devfreq = devfreq_add_device(&pdev->dev, &tegra_devfreq_profile,
|
||||
"tegra_actmon", NULL);
|
||||
if (IS_ERR(devfreq)) {
|
||||
err = PTR_ERR(devfreq);
|
||||
goto remove_governor;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
remove_devfreq:
|
||||
devfreq_remove_device(tegra->devfreq);
|
||||
|
||||
remove_governor:
|
||||
devfreq_remove_governor(&tegra_devfreq_governor);
|
||||
|
||||
unreg_notifier:
|
||||
clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb);
|
||||
|
||||
remove_opps:
|
||||
dev_pm_opp_remove_all_dynamic(&pdev->dev);
|
||||
|
||||
|
|
@ -716,7 +910,6 @@ static int tegra_devfreq_remove(struct platform_device *pdev)
|
|||
devfreq_remove_device(tegra->devfreq);
|
||||
devfreq_remove_governor(&tegra_devfreq_governor);
|
||||
|
||||
clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb);
|
||||
dev_pm_opp_remove_all_dynamic(&pdev->dev);
|
||||
|
||||
reset_control_reset(tegra->reset);
|
||||
|
|
|
|||
|
|
@ -0,0 +1,25 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/*
|
||||
* Samsung Exynos PPMU event types for counting in regs
|
||||
*
|
||||
* Copyright (c) 2019, Samsung Electronics
|
||||
* Author: Lukasz Luba <l.luba@partner.samsung.com>
|
||||
*/
|
||||
|
||||
#ifndef __DT_BINDINGS_PMU_EXYNOS_PPMU_H
|
||||
#define __DT_BINDINGS_PMU_EXYNOS_PPMU_H
|
||||
|
||||
#define PPMU_RO_BUSY_CYCLE_CNT 0x0
|
||||
#define PPMU_WO_BUSY_CYCLE_CNT 0x1
|
||||
#define PPMU_RW_BUSY_CYCLE_CNT 0x2
|
||||
#define PPMU_RO_REQUEST_CNT 0x3
|
||||
#define PPMU_WO_REQUEST_CNT 0x4
|
||||
#define PPMU_RO_DATA_CNT 0x5
|
||||
#define PPMU_WO_DATA_CNT 0x6
|
||||
#define PPMU_RO_LATENCY 0x12
|
||||
#define PPMU_WO_LATENCY 0x16
|
||||
#define PPMU_V2_RO_DATA_CNT 0x4
|
||||
#define PPMU_V2_WO_DATA_CNT 0x5
|
||||
#define PPMU_V2_EVT3_RW_DATA_CNT 0x22
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue