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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
*
* Based on panfrost_devfreq.c:
* Copyright 2019 Collabora ltd.
*/
#include <linux/clk.h>
#include <linux/devfreq.h>
#include <linux/devfreq_cooling.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/property.h>
#include "lima_device.h"
#include "lima_devfreq.h"
static void lima_devfreq_update_utilization(struct lima_devfreq *devfreq)
{
ktime_t now, last;
now = ktime_get();
last = devfreq->time_last_update;
if (devfreq->busy_count > 0)
devfreq->busy_time += ktime_sub(now, last);
else
devfreq->idle_time += ktime_sub(now, last);
devfreq->time_last_update = now;
}
static int lima_devfreq_target(struct device *dev, unsigned long *freq,
u32 flags)
{
struct dev_pm_opp *opp;
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp))
return PTR_ERR(opp);
dev_pm_opp_put(opp);
return dev_pm_opp_set_rate(dev, *freq);
}
static void lima_devfreq_reset(struct lima_devfreq *devfreq)
{
devfreq->busy_time = 0;
devfreq->idle_time = 0;
devfreq->time_last_update = ktime_get();
}
static int lima_devfreq_get_dev_status(struct device *dev,
struct devfreq_dev_status *status)
{
struct lima_device *ldev = dev_get_drvdata(dev);
struct lima_devfreq *devfreq = &ldev->devfreq;
unsigned long irqflags;
status->current_frequency = clk_get_rate(ldev->clk_gpu);
spin_lock_irqsave(&devfreq->lock, irqflags);
lima_devfreq_update_utilization(devfreq);
status->total_time = ktime_to_ns(ktime_add(devfreq->busy_time,
devfreq->idle_time));
status->busy_time = ktime_to_ns(devfreq->busy_time);
lima_devfreq_reset(devfreq);
spin_unlock_irqrestore(&devfreq->lock, irqflags);
dev_dbg(ldev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n",
status->busy_time, status->total_time,
status->busy_time / (status->total_time / 100),
status->current_frequency / 1000 / 1000);
return 0;
}
static struct devfreq_dev_profile lima_devfreq_profile = {
.timer = DEVFREQ_TIMER_DELAYED,
.polling_ms = 50, /* ~3 frames */
.target = lima_devfreq_target,
.get_dev_status = lima_devfreq_get_dev_status,
};
void lima_devfreq_fini(struct lima_device *ldev)
{
struct lima_devfreq *devfreq = &ldev->devfreq;
if (devfreq->cooling) {
devfreq_cooling_unregister(devfreq->cooling);
devfreq->cooling = NULL;
}
if (devfreq->devfreq) {
devm_devfreq_remove_device(ldev->dev, devfreq->devfreq);
devfreq->devfreq = NULL;
}
}
int lima_devfreq_init(struct lima_device *ldev)
{
struct thermal_cooling_device *cooling;
struct device *dev = ldev->dev;
struct devfreq *devfreq;
struct lima_devfreq *ldevfreq = &ldev->devfreq;
struct dev_pm_opp *opp;
unsigned long cur_freq;
int ret;
const char *regulator_names[] = { "mali", NULL };
if (!device_property_present(dev, "operating-points-v2"))
/* Optional, continue without devfreq */
return 0;
spin_lock_init(&ldevfreq->lock);
/*
* clkname is set separately so it is not affected by the optional
* regulator setting which may return error.
*/
ret = devm_pm_opp_set_clkname(dev, "core");
if (ret)
return ret;
ret = devm_pm_opp_set_regulators(dev, regulator_names);
if (ret) {
/* Continue if the optional regulator is missing */
if (ret != -ENODEV)
return ret;
}
ret = devm_pm_opp_of_add_table(dev);
if (ret)
return ret;
lima_devfreq_reset(ldevfreq);
cur_freq = clk_get_rate(ldev->clk_gpu);
opp = devfreq_recommended_opp(dev, &cur_freq, 0);
if (IS_ERR(opp))
return PTR_ERR(opp);
lima_devfreq_profile.initial_freq = cur_freq;
dev_pm_opp_put(opp);
/*
* Setup default thresholds for the simple_ondemand governor.
* The values are chosen based on experiments.
*/
ldevfreq->gov_data.upthreshold = 30;
ldevfreq->gov_data.downdifferential = 5;
devfreq = devm_devfreq_add_device(dev, &lima_devfreq_profile,
DEVFREQ_GOV_SIMPLE_ONDEMAND,
&ldevfreq->gov_data);
if (IS_ERR(devfreq)) {
dev_err(dev, "Couldn't initialize GPU devfreq\n");
return PTR_ERR(devfreq);
}
ldevfreq->devfreq = devfreq;
cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
if (IS_ERR(cooling))
dev_info(dev, "Failed to register cooling device\n");
else
ldevfreq->cooling = cooling;
return 0;
}
void lima_devfreq_record_busy(struct lima_devfreq *devfreq)
{
unsigned long irqflags;
if (!devfreq->devfreq)
return;
spin_lock_irqsave(&devfreq->lock, irqflags);
lima_devfreq_update_utilization(devfreq);
devfreq->busy_count++;
spin_unlock_irqrestore(&devfreq->lock, irqflags);
}
void lima_devfreq_record_idle(struct lima_devfreq *devfreq)
{
unsigned long irqflags;
if (!devfreq->devfreq)
return;
spin_lock_irqsave(&devfreq->lock, irqflags);
lima_devfreq_update_utilization(devfreq);
WARN_ON(--devfreq->busy_count < 0);
spin_unlock_irqrestore(&devfreq->lock, irqflags);
}
int lima_devfreq_resume(struct lima_devfreq *devfreq)
{
unsigned long irqflags;
if (!devfreq->devfreq)
return 0;
spin_lock_irqsave(&devfreq->lock, irqflags);
lima_devfreq_reset(devfreq);
spin_unlock_irqrestore(&devfreq->lock, irqflags);
return devfreq_resume_device(devfreq->devfreq);
}
int lima_devfreq_suspend(struct lima_devfreq *devfreq)
{
if (!devfreq->devfreq)
return 0;
return devfreq_suspend_device(devfreq->devfreq);
}
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