388 lines
9.6 KiB
C
388 lines
9.6 KiB
C
/*
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* Tegra Graphics Host Unit clock scaling
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*
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* Copyright (c) 2010-2013, NVIDIA Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/devfreq.h>
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#include <linux/debugfs.h>
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#include <linux/types.h>
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#include <linux/clk.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/clk/tegra.h>
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#include <linux/tegra-soc.h>
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#include <linux/tegra-dvfs.h>
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#include <linux/clk-provider.h>
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#include <governor.h>
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#include "dev.h"
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#include "chip_support.h"
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#include "nvhost_acm.h"
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#include "nvhost_scale.h"
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#include "host1x/host1x_actmon.h"
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static ssize_t nvhost_scale_load_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct nvhost_device_data *pdata = dev_get_drvdata(dev);
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struct nvhost_device_profile *profile = pdata->power_profile;
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u32 busy_time;
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ssize_t res;
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actmon_op().read_avg_norm(profile->actmon, &busy_time);
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res = snprintf(buf, PAGE_SIZE, "%u\n", busy_time);
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return res;
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}
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static DEVICE_ATTR(load, S_IRUGO, nvhost_scale_load_show, NULL);
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/*
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* nvhost_scale_make_freq_table(profile)
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*
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* This function initialises the frequency table for the given device profile
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*/
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static int nvhost_scale_make_freq_table(struct nvhost_device_profile *profile)
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{
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unsigned long *freqs;
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int num_freqs, err;
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unsigned long max_freq = clk_round_rate(profile->clk, UINT_MAX);
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unsigned long min_freq = clk_round_rate(profile->clk, 0);
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err = tegra_dvfs_get_freqs(clk_get_parent(profile->clk),
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&freqs, &num_freqs);
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if (err)
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return -ENOSYS;
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/* check for duplicate frequencies at higher end */
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while ((num_freqs >= 2 &&
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freqs[num_freqs - 2] == freqs[num_freqs - 1]) ||
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(num_freqs && max_freq < freqs[num_freqs - 1]))
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num_freqs--;
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/* check low end */
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while ((num_freqs >= 2 && freqs[0] == freqs[1]) ||
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(num_freqs && freqs[0] < min_freq)) {
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freqs++;
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num_freqs--;
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}
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if (!num_freqs)
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dev_warn(&profile->pdev->dev, "dvfs table had no applicable frequencies!\n");
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profile->devfreq_profile.freq_table = (unsigned int *)freqs;
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profile->devfreq_profile.max_state = num_freqs;
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return 0;
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}
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/*
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* nvhost_scale_target(dev, *freq, flags)
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*
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* This function scales the clock
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*/
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static int nvhost_scale_target(struct device *dev, unsigned long *freq,
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u32 flags)
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{
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struct nvhost_device_data *pdata = dev_get_drvdata(dev);
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struct nvhost_device_profile *profile = pdata->power_profile;
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if (!__clk_get_enable_count(profile->clk)) {
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*freq = profile->ext_stat.min_freq;
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return 0;
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}
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*freq = clk_round_rate(clk_get_parent(profile->clk), *freq);
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if (clk_get_rate(profile->clk) == *freq)
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return 0;
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nvhost_module_set_devfreq_rate(profile->pdev, 0, *freq);
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if (pdata->scaling_post_cb)
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pdata->scaling_post_cb(profile, *freq);
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*freq = clk_get_rate(profile->clk);
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return 0;
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}
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/*
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* update_load_estimate(profile)
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*
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* Update load estimate using busy/idle flag.
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*/
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static void update_load_estimate(struct nvhost_device_profile *profile,
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bool busy)
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{
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ktime_t t;
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unsigned long dt;
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t = ktime_get();
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dt = ktime_us_delta(t, profile->last_event_time);
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profile->dev_stat.total_time += dt;
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profile->last_event_time = t;
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if (profile->busy)
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profile->dev_stat.busy_time += dt;
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profile->busy = busy;
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}
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/*
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* update_load_estimate_actmon(profile)
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*
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* Update load estimate using hardware actmon. The actmon value is normalised
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* based on the time it was asked last time.
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*/
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static void update_load_estimate_actmon(struct nvhost_device_profile *profile)
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{
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ktime_t t;
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unsigned long dt;
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u32 busy_time;
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t = ktime_get();
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dt = ktime_us_delta(t, profile->last_event_time);
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profile->dev_stat.total_time = dt;
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profile->last_event_time = t;
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actmon_op().read_avg_norm(profile->actmon, &busy_time);
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profile->dev_stat.busy_time = (busy_time * dt) / 1000;
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}
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/*
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* nvhost_scale_notify(pdev, busy)
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*
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* Calling this function informs that the device is idling (..or busy). This
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* data is used to estimate the current load
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*/
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static void nvhost_scale_notify(struct platform_device *pdev, bool busy)
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{
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struct nvhost_device_data *pdata = platform_get_drvdata(pdev);
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struct nvhost_device_profile *profile = pdata->power_profile;
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struct devfreq *devfreq = pdata->power_manager;
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/* Is the device profile initialised? */
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if (!profile)
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return;
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/* If defreq is disabled, set the freq to max or min */
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if (!devfreq) {
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unsigned long freq = busy ? UINT_MAX : 0;
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nvhost_scale_target(&pdev->dev, &freq, 0);
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return;
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}
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mutex_lock(&devfreq->lock);
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if (!profile->actmon)
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update_load_estimate(profile, busy);
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profile->last_event_type = busy ? DEVICE_BUSY : DEVICE_IDLE;
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update_devfreq(devfreq);
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mutex_unlock(&devfreq->lock);
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}
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void nvhost_scale_notify_idle(struct platform_device *pdev)
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{
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nvhost_scale_notify(pdev, false);
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}
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void nvhost_scale_notify_busy(struct platform_device *pdev)
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{
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nvhost_scale_notify(pdev, true);
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}
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/*
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* nvhost_scale_get_dev_status(dev, *stat)
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*
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* This function queries the current device status.
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*/
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static int nvhost_scale_get_dev_status(struct device *dev,
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struct devfreq_dev_status *stat)
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{
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struct nvhost_device_data *pdata = dev_get_drvdata(dev);
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struct nvhost_device_profile *profile = pdata->power_profile;
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/* Make sure there are correct values for the current frequency */
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profile->dev_stat.current_frequency = clk_get_rate(profile->clk);
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if (profile->actmon)
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update_load_estimate_actmon(profile);
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/* Copy the contents of the current device status */
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profile->ext_stat.busy = profile->last_event_type;
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*stat = profile->dev_stat;
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/* Finally, clear out the local values */
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profile->dev_stat.total_time = 0;
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profile->dev_stat.busy_time = 0;
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return 0;
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}
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/*
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* nvhost_scale_init(pdev)
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*/
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void nvhost_scale_init(struct platform_device *pdev)
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{
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struct nvhost_device_data *pdata = platform_get_drvdata(pdev);
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struct nvhost_device_profile *profile;
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if (pdata->power_profile)
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return;
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profile = kzalloc(sizeof(struct nvhost_device_profile), GFP_KERNEL);
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if (!profile)
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return;
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pdata->power_profile = profile;
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profile->pdev = pdev;
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profile->clk = pdata->clk[0];
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profile->last_event_type = DEVICE_IDLE;
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/* Initialize devfreq related structures */
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profile->dev_stat.private_data = &profile->ext_stat;
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profile->ext_stat.min_freq =
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clk_round_rate(clk_get_parent(profile->clk), 0);
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profile->ext_stat.max_freq =
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clk_round_rate(clk_get_parent(profile->clk), UINT_MAX);
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profile->ext_stat.busy = DEVICE_IDLE;
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if (profile->ext_stat.min_freq == profile->ext_stat.max_freq) {
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dev_warn(&pdev->dev, "max rate = min rate (%lu), disabling scaling\n",
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profile->ext_stat.min_freq);
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goto err_fetch_clocks;
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}
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/* Initialize actmon */
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if (pdata->actmon_enabled) {
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if (device_create_file(&pdev->dev,
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&dev_attr_load))
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goto err_create_sysfs_entry;
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profile->actmon = kzalloc(sizeof(struct host1x_actmon),
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GFP_KERNEL);
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if (!profile->actmon)
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goto err_allocate_actmon;
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profile->actmon->host = nvhost_get_host(pdev);
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profile->actmon->regs = nvhost_get_host(pdev)->aperture +
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pdata->actmon_regs;
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actmon_op().init(profile->actmon);
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actmon_op().debug_init(profile->actmon, pdata->debugfs);
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actmon_op().deinit(profile->actmon);
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}
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if (pdata->devfreq_governor) {
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struct devfreq *devfreq;
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int err;
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profile->devfreq_profile.initial_freq =
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profile->ext_stat.min_freq;
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profile->devfreq_profile.target = nvhost_scale_target;
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profile->devfreq_profile.get_dev_status =
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nvhost_scale_get_dev_status;
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err = nvhost_scale_make_freq_table(profile);
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if (err)
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goto err_get_freqs;
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devfreq = devfreq_add_device(&pdev->dev,
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&profile->devfreq_profile,
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pdata->devfreq_governor, NULL);
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if (IS_ERR(devfreq))
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devfreq = NULL;
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pdata->power_manager = devfreq;
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}
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return;
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err_get_freqs:
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err_allocate_actmon:
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device_remove_file(&pdev->dev, &dev_attr_load);
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err_create_sysfs_entry:
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err_fetch_clocks:
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kfree(pdata->power_profile);
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pdata->power_profile = NULL;
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}
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/*
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* nvhost_scale_deinit(dev)
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*
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* Stop scaling for the given device.
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*/
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void nvhost_scale_deinit(struct platform_device *pdev)
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{
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struct nvhost_device_data *pdata = platform_get_drvdata(pdev);
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struct nvhost_device_profile *profile = pdata->power_profile;
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if (!profile)
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return;
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if (pdata->power_manager)
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devfreq_remove_device(pdata->power_manager);
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if (pdata->actmon_enabled)
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device_remove_file(&pdev->dev, &dev_attr_load);
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kfree(profile->devfreq_profile.freq_table);
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kfree(profile->actmon);
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kfree(profile);
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pdata->power_profile = NULL;
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}
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/*
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* nvhost_scale_hw_init(dev)
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*
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* Initialize hardware portion of the device
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*/
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int nvhost_scale_hw_init(struct platform_device *pdev)
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{
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struct nvhost_device_data *pdata = platform_get_drvdata(pdev);
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struct nvhost_device_profile *profile = pdata->power_profile;
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if (profile && profile->actmon)
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actmon_op().init(profile->actmon);
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return 0;
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}
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/*
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* nvhost_scale_hw_deinit(dev)
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*
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* Deinitialize the hw partition related to scaling
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*/
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void nvhost_scale_hw_deinit(struct platform_device *pdev)
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{
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struct nvhost_device_data *pdata = platform_get_drvdata(pdev);
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struct nvhost_device_profile *profile = pdata->power_profile;
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if (profile && profile->actmon)
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actmon_op().deinit(profile->actmon);
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}
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