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6d8a154f1d
Use resource-managed OPP API to simplify code. Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Reviewed-by: Steven Price <steven.price@arm.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
207 lines
4.8 KiB
C
207 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2019 Collabora ltd. */
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#include <linux/clk.h>
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#include <linux/devfreq.h>
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#include <linux/devfreq_cooling.h>
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#include <linux/platform_device.h>
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#include <linux/pm_opp.h>
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#include "panfrost_device.h"
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#include "panfrost_devfreq.h"
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static void panfrost_devfreq_update_utilization(struct panfrost_devfreq *pfdevfreq)
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{
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ktime_t now, last;
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now = ktime_get();
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last = pfdevfreq->time_last_update;
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if (pfdevfreq->busy_count > 0)
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pfdevfreq->busy_time += ktime_sub(now, last);
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else
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pfdevfreq->idle_time += ktime_sub(now, last);
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pfdevfreq->time_last_update = now;
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}
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static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
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u32 flags)
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{
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struct dev_pm_opp *opp;
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opp = devfreq_recommended_opp(dev, freq, flags);
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if (IS_ERR(opp))
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return PTR_ERR(opp);
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dev_pm_opp_put(opp);
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return dev_pm_opp_set_rate(dev, *freq);
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}
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static void panfrost_devfreq_reset(struct panfrost_devfreq *pfdevfreq)
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{
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pfdevfreq->busy_time = 0;
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pfdevfreq->idle_time = 0;
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pfdevfreq->time_last_update = ktime_get();
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}
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static int panfrost_devfreq_get_dev_status(struct device *dev,
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struct devfreq_dev_status *status)
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{
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struct panfrost_device *pfdev = dev_get_drvdata(dev);
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struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
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unsigned long irqflags;
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status->current_frequency = clk_get_rate(pfdev->clock);
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spin_lock_irqsave(&pfdevfreq->lock, irqflags);
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panfrost_devfreq_update_utilization(pfdevfreq);
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status->total_time = ktime_to_ns(ktime_add(pfdevfreq->busy_time,
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pfdevfreq->idle_time));
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status->busy_time = ktime_to_ns(pfdevfreq->busy_time);
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panfrost_devfreq_reset(pfdevfreq);
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spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
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dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n",
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status->busy_time, status->total_time,
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status->busy_time / (status->total_time / 100),
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status->current_frequency / 1000 / 1000);
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return 0;
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}
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static struct devfreq_dev_profile panfrost_devfreq_profile = {
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.timer = DEVFREQ_TIMER_DELAYED,
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.polling_ms = 50, /* ~3 frames */
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.target = panfrost_devfreq_target,
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.get_dev_status = panfrost_devfreq_get_dev_status,
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};
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int panfrost_devfreq_init(struct panfrost_device *pfdev)
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{
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int ret;
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struct dev_pm_opp *opp;
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unsigned long cur_freq;
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struct device *dev = &pfdev->pdev->dev;
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struct devfreq *devfreq;
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struct thermal_cooling_device *cooling;
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struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
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ret = devm_pm_opp_set_regulators(dev, pfdev->comp->supply_names,
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pfdev->comp->num_supplies);
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if (ret) {
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/* Continue if the optional regulator is missing */
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if (ret != -ENODEV) {
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DRM_DEV_ERROR(dev, "Couldn't set OPP regulators\n");
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return ret;
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}
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}
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ret = devm_pm_opp_of_add_table(dev);
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if (ret) {
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/* Optional, continue without devfreq */
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if (ret == -ENODEV)
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ret = 0;
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return ret;
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}
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pfdevfreq->opp_of_table_added = true;
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spin_lock_init(&pfdevfreq->lock);
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panfrost_devfreq_reset(pfdevfreq);
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cur_freq = clk_get_rate(pfdev->clock);
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opp = devfreq_recommended_opp(dev, &cur_freq, 0);
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if (IS_ERR(opp))
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return PTR_ERR(opp);
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panfrost_devfreq_profile.initial_freq = cur_freq;
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dev_pm_opp_put(opp);
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devfreq = devm_devfreq_add_device(dev, &panfrost_devfreq_profile,
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DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
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if (IS_ERR(devfreq)) {
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DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
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return PTR_ERR(devfreq);
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}
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pfdevfreq->devfreq = devfreq;
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cooling = devfreq_cooling_em_register(devfreq, NULL);
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if (IS_ERR(cooling))
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DRM_DEV_INFO(dev, "Failed to register cooling device\n");
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else
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pfdevfreq->cooling = cooling;
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return 0;
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}
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void panfrost_devfreq_fini(struct panfrost_device *pfdev)
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{
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struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
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if (pfdevfreq->cooling) {
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devfreq_cooling_unregister(pfdevfreq->cooling);
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pfdevfreq->cooling = NULL;
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}
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}
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void panfrost_devfreq_resume(struct panfrost_device *pfdev)
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{
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struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
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if (!pfdevfreq->devfreq)
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return;
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panfrost_devfreq_reset(pfdevfreq);
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devfreq_resume_device(pfdevfreq->devfreq);
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}
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void panfrost_devfreq_suspend(struct panfrost_device *pfdev)
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{
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struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
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if (!pfdevfreq->devfreq)
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return;
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devfreq_suspend_device(pfdevfreq->devfreq);
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}
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void panfrost_devfreq_record_busy(struct panfrost_devfreq *pfdevfreq)
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{
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unsigned long irqflags;
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if (!pfdevfreq->devfreq)
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return;
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spin_lock_irqsave(&pfdevfreq->lock, irqflags);
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panfrost_devfreq_update_utilization(pfdevfreq);
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pfdevfreq->busy_count++;
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spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
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}
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void panfrost_devfreq_record_idle(struct panfrost_devfreq *pfdevfreq)
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{
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unsigned long irqflags;
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if (!pfdevfreq->devfreq)
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return;
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spin_lock_irqsave(&pfdevfreq->lock, irqflags);
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panfrost_devfreq_update_utilization(pfdevfreq);
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WARN_ON(--pfdevfreq->busy_count < 0);
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spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
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}
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