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// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Collabora ltd. */
#include <linux/devfreq.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include "panfrost_device.h"
#include "panfrost_devfreq.h"
#include "panfrost_features.h"
#include "panfrost_issues.h"
#include "panfrost_gpu.h"
#include "panfrost_regs.h"
static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev);
static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
u32 flags)
{
struct dev_pm_opp *opp;
int err;
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp))
return PTR_ERR(opp);
dev_pm_opp_put(opp);
err = dev_pm_opp_set_rate(dev, *freq);
if (err)
return err;
return 0;
}
static void panfrost_devfreq_reset(struct panfrost_device *pfdev)
{
pfdev->devfreq.busy_time = 0;
pfdev->devfreq.idle_time = 0;
pfdev->devfreq.time_last_update = ktime_get();
}
static int panfrost_devfreq_get_dev_status(struct device *dev,
struct devfreq_dev_status *status)
{
struct panfrost_device *pfdev = dev_get_drvdata(dev);
panfrost_devfreq_update_utilization(pfdev);
status->current_frequency = clk_get_rate(pfdev->clock);
status->total_time = ktime_to_ns(ktime_add(pfdev->devfreq.busy_time,
pfdev->devfreq.idle_time));
status->busy_time = ktime_to_ns(pfdev->devfreq.busy_time);
panfrost_devfreq_reset(pfdev);
dev_dbg(pfdev->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 panfrost_devfreq_profile = {
.polling_ms = 50, /* ~3 frames */
.target = panfrost_devfreq_target,
.get_dev_status = panfrost_devfreq_get_dev_status,
};
int panfrost_devfreq_init(struct panfrost_device *pfdev)
{
int ret;
struct dev_pm_opp *opp;
unsigned long cur_freq;
ret = dev_pm_opp_of_add_table(&pfdev->pdev->dev);
if (ret == -ENODEV) /* Optional, continue without devfreq */
return 0;
else if (ret)
return ret;
panfrost_devfreq_reset(pfdev);
cur_freq = clk_get_rate(pfdev->clock);
opp = devfreq_recommended_opp(&pfdev->pdev->dev, &cur_freq, 0);
if (IS_ERR(opp))
return PTR_ERR(opp);
panfrost_devfreq_profile.initial_freq = cur_freq;
dev_pm_opp_put(opp);
pfdev->devfreq.devfreq = devm_devfreq_add_device(&pfdev->pdev->dev,
&panfrost_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
NULL);
if (IS_ERR(pfdev->devfreq.devfreq)) {
DRM_DEV_ERROR(&pfdev->pdev->dev, "Couldn't initialize GPU devfreq\n");
ret = PTR_ERR(pfdev->devfreq.devfreq);
pfdev->devfreq.devfreq = NULL;
dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
return ret;
}
return 0;
}
void panfrost_devfreq_fini(struct panfrost_device *pfdev)
{
dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
}
void panfrost_devfreq_resume(struct panfrost_device *pfdev)
{
if (!pfdev->devfreq.devfreq)
return;
panfrost_devfreq_reset(pfdev);
devfreq_resume_device(pfdev->devfreq.devfreq);
}
void panfrost_devfreq_suspend(struct panfrost_device *pfdev)
{
if (!pfdev->devfreq.devfreq)
return;
devfreq_suspend_device(pfdev->devfreq.devfreq);
}
static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev)
{
ktime_t now;
ktime_t last;
if (!pfdev->devfreq.devfreq)
return;
now = ktime_get();
last = pfdev->devfreq.time_last_update;
if (atomic_read(&pfdev->devfreq.busy_count) > 0)
pfdev->devfreq.busy_time += ktime_sub(now, last);
else
pfdev->devfreq.idle_time += ktime_sub(now, last);
pfdev->devfreq.time_last_update = now;
}
void panfrost_devfreq_record_busy(struct panfrost_device *pfdev)
{
panfrost_devfreq_update_utilization(pfdev);
atomic_inc(&pfdev->devfreq.busy_count);
}
void panfrost_devfreq_record_idle(struct panfrost_device *pfdev)
{
int count;
panfrost_devfreq_update_utilization(pfdev);
count = atomic_dec_if_positive(&pfdev->devfreq.busy_count);
WARN_ON(count < 0);
}
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