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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*/
#include "msm_gpu.h"
#include "msm_gpu_trace.h"
#include <linux/devfreq.h>
#include <linux/devfreq_cooling.h>
/*
* Power Management:
*/
static int msm_devfreq_target(struct device *dev, unsigned long *freq,
u32 flags)
{
struct msm_gpu *gpu = dev_to_gpu(dev);
struct dev_pm_opp *opp;
opp = devfreq_recommended_opp(dev, freq, flags);
/*
* If the GPU is idle, devfreq is not aware, so just ignore
* it's requests
*/
if (gpu->devfreq.idle_freq) {
gpu->devfreq.idle_freq = *freq;
return 0;
}
if (IS_ERR(opp))
return PTR_ERR(opp);
trace_msm_gpu_freq_change(dev_pm_opp_get_freq(opp));
if (gpu->funcs->gpu_set_freq)
gpu->funcs->gpu_set_freq(gpu, opp);
else
clk_set_rate(gpu->core_clk, *freq);
dev_pm_opp_put(opp);
return 0;
}
static unsigned long get_freq(struct msm_gpu *gpu)
{
if (gpu->devfreq.idle_freq)
return gpu->devfreq.idle_freq;
if (gpu->funcs->gpu_get_freq)
return gpu->funcs->gpu_get_freq(gpu);
return clk_get_rate(gpu->core_clk);
}
static int msm_devfreq_get_dev_status(struct device *dev,
struct devfreq_dev_status *status)
{
struct msm_gpu *gpu = dev_to_gpu(dev);
ktime_t time;
status->current_frequency = get_freq(gpu);
status->busy_time = gpu->funcs->gpu_busy(gpu);
time = ktime_get();
status->total_time = ktime_us_delta(time, gpu->devfreq.time);
gpu->devfreq.time = time;
return 0;
}
static int msm_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
{
*freq = get_freq(dev_to_gpu(dev));
return 0;
}
static struct devfreq_dev_profile msm_devfreq_profile = {
.timer = DEVFREQ_TIMER_DELAYED,
.polling_ms = 50,
.target = msm_devfreq_target,
.get_dev_status = msm_devfreq_get_dev_status,
.get_cur_freq = msm_devfreq_get_cur_freq,
};
void msm_devfreq_init(struct msm_gpu *gpu)
{
/* We need target support to do devfreq */
if (!gpu->funcs->gpu_busy)
return;
msm_devfreq_profile.initial_freq = gpu->fast_rate;
/*
* Don't set the freq_table or max_state and let devfreq build the table
* from OPP
* After a deferred probe, these may have be left to non-zero values,
* so set them back to zero before creating the devfreq device
*/
msm_devfreq_profile.freq_table = NULL;
msm_devfreq_profile.max_state = 0;
gpu->devfreq.devfreq = devm_devfreq_add_device(&gpu->pdev->dev,
&msm_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
NULL);
if (IS_ERR(gpu->devfreq.devfreq)) {
DRM_DEV_ERROR(&gpu->pdev->dev, "Couldn't initialize GPU devfreq\n");
gpu->devfreq.devfreq = NULL;
return;
}
devfreq_suspend_device(gpu->devfreq.devfreq);
gpu->cooling = of_devfreq_cooling_register(gpu->pdev->dev.of_node,
gpu->devfreq.devfreq);
if (IS_ERR(gpu->cooling)) {
DRM_DEV_ERROR(&gpu->pdev->dev,
"Couldn't register GPU cooling device\n");
gpu->cooling = NULL;
}
}
void msm_devfreq_cleanup(struct msm_gpu *gpu)
{
devfreq_cooling_unregister(gpu->cooling);
}
void msm_devfreq_resume(struct msm_gpu *gpu)
{
gpu->devfreq.busy_cycles = 0;
gpu->devfreq.time = ktime_get();
devfreq_resume_device(gpu->devfreq.devfreq);
}
void msm_devfreq_suspend(struct msm_gpu *gpu)
{
devfreq_suspend_device(gpu->devfreq.devfreq);
}
void msm_devfreq_active(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
struct devfreq_dev_status status;
unsigned int idle_time;
unsigned long target_freq = df->idle_freq;
if (!df->devfreq)
return;
/*
* Hold devfreq lock to synchronize with get_dev_status()/
* target() callbacks
*/
mutex_lock(&df->devfreq->lock);
idle_time = ktime_to_ms(ktime_sub(ktime_get(), df->idle_time));
/*
* If we've been idle for a significant fraction of a polling
* interval, then we won't meet the threshold of busyness for
* the governor to ramp up the freq.. so give some boost
*/
if (idle_time > msm_devfreq_profile.polling_ms/2) {
target_freq *= 2;
}
df->idle_freq = 0;
msm_devfreq_target(&gpu->pdev->dev, &target_freq, 0);
/*
* Reset the polling interval so we aren't inconsistent
* about freq vs busy/total cycles
*/
msm_devfreq_get_dev_status(&gpu->pdev->dev, &status);
mutex_unlock(&df->devfreq->lock);
}
void msm_devfreq_idle(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
unsigned long idle_freq, target_freq = 0;
if (!df->devfreq)
return;
/*
* Hold devfreq lock to synchronize with get_dev_status()/
* target() callbacks
*/
mutex_lock(&df->devfreq->lock);
idle_freq = get_freq(gpu);
if (gpu->clamp_to_idle)
msm_devfreq_target(&gpu->pdev->dev, &target_freq, 0);
df->idle_time = ktime_get();
df->idle_freq = idle_freq;
mutex_unlock(&df->devfreq->lock);
}
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