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https://github.com/edk2-porting/linux-next.git
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1c3b526e55
Devfreq runtime usage was made mandatory, thus making panfrost fail to probe
on Amlogic S912 SoCs missing the "operating-points-v2" property.
Make it optional again, leaving PM_DEVFREQ selected by default.
Fixes: f3617b449d
("drm/panfrost: Select devfreq")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190605150233.32722-1-narmstrong@baylibre.com
222 lines
5.8 KiB
C
222 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2019 Collabora ltd. */
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#include <linux/devfreq.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/clk.h>
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#include <linux/regulator/consumer.h>
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#include "panfrost_device.h"
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#include "panfrost_devfreq.h"
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#include "panfrost_features.h"
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#include "panfrost_issues.h"
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#include "panfrost_gpu.h"
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#include "panfrost_regs.h"
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static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev, int slot);
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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 panfrost_device *pfdev = platform_get_drvdata(to_platform_device(dev));
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struct dev_pm_opp *opp;
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unsigned long old_clk_rate = pfdev->devfreq.cur_freq;
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unsigned long target_volt, target_rate;
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int err;
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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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target_rate = dev_pm_opp_get_freq(opp);
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target_volt = dev_pm_opp_get_voltage(opp);
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dev_pm_opp_put(opp);
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if (old_clk_rate == target_rate)
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return 0;
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/*
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* If frequency scaling from low to high, adjust voltage first.
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* If frequency scaling from high to low, adjust frequency first.
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*/
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if (old_clk_rate < target_rate) {
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err = regulator_set_voltage(pfdev->regulator, target_volt,
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target_volt);
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if (err) {
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dev_err(dev, "Cannot set voltage %lu uV\n",
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target_volt);
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return err;
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}
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}
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err = clk_set_rate(pfdev->clock, target_rate);
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if (err) {
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dev_err(dev, "Cannot set frequency %lu (%d)\n", target_rate,
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err);
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regulator_set_voltage(pfdev->regulator, pfdev->devfreq.cur_volt,
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pfdev->devfreq.cur_volt);
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return err;
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}
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if (old_clk_rate > target_rate) {
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err = regulator_set_voltage(pfdev->regulator, target_volt,
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target_volt);
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if (err)
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dev_err(dev, "Cannot set voltage %lu uV\n", target_volt);
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}
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pfdev->devfreq.cur_freq = target_rate;
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pfdev->devfreq.cur_volt = target_volt;
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return 0;
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}
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static void panfrost_devfreq_reset(struct panfrost_device *pfdev)
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{
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ktime_t now = ktime_get();
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int i;
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for (i = 0; i < NUM_JOB_SLOTS; i++) {
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pfdev->devfreq.slot[i].busy_time = 0;
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pfdev->devfreq.slot[i].idle_time = 0;
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pfdev->devfreq.slot[i].time_last_update = now;
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}
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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 = platform_get_drvdata(to_platform_device(dev));
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int i;
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for (i = 0; i < NUM_JOB_SLOTS; i++) {
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panfrost_devfreq_update_utilization(pfdev, i);
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}
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status->current_frequency = clk_get_rate(pfdev->clock);
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status->total_time = ktime_to_ns(ktime_add(pfdev->devfreq.slot[0].busy_time,
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pfdev->devfreq.slot[0].idle_time));
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status->busy_time = 0;
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for (i = 0; i < NUM_JOB_SLOTS; i++) {
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status->busy_time += ktime_to_ns(pfdev->devfreq.slot[i].busy_time);
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}
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/* We're scheduling only to one core atm, so don't divide for now */
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/* status->busy_time /= NUM_JOB_SLOTS; */
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panfrost_devfreq_reset(pfdev);
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dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n", status->busy_time,
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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 int panfrost_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
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{
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struct panfrost_device *pfdev = platform_get_drvdata(to_platform_device(dev));
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*freq = pfdev->devfreq.cur_freq;
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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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.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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.get_cur_freq = panfrost_devfreq_get_cur_freq,
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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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if (!pfdev->regulator)
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return 0;
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ret = dev_pm_opp_of_add_table(&pfdev->pdev->dev);
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if (ret == -ENODEV) /* Optional, continue without devfreq */
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return 0;
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else if (ret)
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return ret;
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panfrost_devfreq_reset(pfdev);
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pfdev->devfreq.cur_freq = clk_get_rate(pfdev->clock);
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opp = devfreq_recommended_opp(&pfdev->pdev->dev, &pfdev->devfreq.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 = pfdev->devfreq.cur_freq;
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dev_pm_opp_put(opp);
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pfdev->devfreq.devfreq = devm_devfreq_add_device(&pfdev->pdev->dev,
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&panfrost_devfreq_profile, "simple_ondemand", NULL);
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if (IS_ERR(pfdev->devfreq.devfreq)) {
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DRM_DEV_ERROR(&pfdev->pdev->dev, "Couldn't initialize GPU devfreq\n");
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ret = PTR_ERR(pfdev->devfreq.devfreq);
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pfdev->devfreq.devfreq = NULL;
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return ret;
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}
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return 0;
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}
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void panfrost_devfreq_resume(struct panfrost_device *pfdev)
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{
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int i;
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if (!pfdev->devfreq.devfreq)
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return;
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panfrost_devfreq_reset(pfdev);
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for (i = 0; i < NUM_JOB_SLOTS; i++)
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pfdev->devfreq.slot[i].busy = false;
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devfreq_resume_device(pfdev->devfreq.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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if (!pfdev->devfreq.devfreq)
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return;
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devfreq_suspend_device(pfdev->devfreq.devfreq);
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}
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static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev, int slot)
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{
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struct panfrost_devfreq_slot *devfreq_slot = &pfdev->devfreq.slot[slot];
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ktime_t now;
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ktime_t last;
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if (!pfdev->devfreq.devfreq)
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return;
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now = ktime_get();
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last = pfdev->devfreq.slot[slot].time_last_update;
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/* If we last recorded a transition to busy, we have been idle since */
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if (devfreq_slot->busy)
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pfdev->devfreq.slot[slot].busy_time += ktime_sub(now, last);
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else
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pfdev->devfreq.slot[slot].idle_time += ktime_sub(now, last);
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pfdev->devfreq.slot[slot].time_last_update = now;
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}
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/* The job scheduler is expected to call this at every transition busy <-> idle */
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void panfrost_devfreq_record_transition(struct panfrost_device *pfdev, int slot)
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{
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struct panfrost_devfreq_slot *devfreq_slot = &pfdev->devfreq.slot[slot];
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panfrost_devfreq_update_utilization(pfdev, slot);
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devfreq_slot->busy = !devfreq_slot->busy;
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}
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