Merge "devfreq: memlat: Add suspend/resume for mem_latency" (e033772e) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/devfreq/governor_memlat.c

+71 −1

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
		* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 and
		@@ -43,6 +43,7 @@ struct memlat_node {
		struct memlat_hwmon *hw;
		struct devfreq_governor *gov;
		struct attribute_group *attr_grp;
		unsigned long resume_freq;
		};

		static LIST_HEAD(memlat_list);
		@@ -212,6 +213,39 @@ static int gov_start(struct devfreq *df)
		return ret;
		}

		static int gov_suspend(struct devfreq *df)
		{
		struct memlat_node *node = df->data;
		unsigned long prev_freq = df->previous_freq;

		node->mon_started = false;
		devfreq_monitor_suspend(df);

		mutex_lock(&df->lock);
		update_devfreq(df);
		mutex_unlock(&df->lock);

		node->resume_freq = max(prev_freq, 1UL);

		return 0;
		}

		static int gov_resume(struct devfreq *df)
		{
		struct memlat_node *node = df->data;

		mutex_lock(&df->lock);
		update_devfreq(df);
		mutex_unlock(&df->lock);

		node->resume_freq = 0;

		devfreq_monitor_resume(df);
		node->mon_started = true;

		return 0;
		}

		static void gov_stop(struct devfreq *df)
		{
		struct memlat_node *node = df->data;
		@@ -233,6 +267,18 @@ static int devfreq_memlat_get_freq(struct devfreq *df,
		unsigned long max_freq = 0;
		unsigned int ratio;

		/*
		* node->resume_freq is set to 0 at the end of resume (after the update)
		* and is set to df->prev_freq at the end of suspend (after the update).
		* This function will be called as part of the update_devfreq call in
		* both scenarios. As a result, this block will cause a 0 vote during
		* suspend and a vote for df->prev_freq during resume.
		*/
		if (!node->mon_started) {
		*freq = node->resume_freq;
		return 0;
		}

		hw->get_cnt(hw);

		for (i = 0; i < hw->num_cores; i++) {
		@@ -331,6 +377,30 @@ static int devfreq_memlat_ev_handler(struct devfreq *df,
		"Disabled Memory Latency governor\n");
		break;

		case DEVFREQ_GOV_SUSPEND:
		ret = gov_suspend(df);
		if (ret) {
		dev_err(df->dev.parent,
		"Unable to suspend memlat governor (%d)\n",
		ret);
		return ret;
		}

		dev_dbg(df->dev.parent, "Suspended memlat governor\n");
		break;

		case DEVFREQ_GOV_RESUME:
		ret = gov_resume(df);
		if (ret) {
		dev_err(df->dev.parent,
		"Unable to resume memlat governor (%d)\n",
		ret);
		return ret;
		}

		dev_dbg(df->dev.parent, "Resumed memlat governor\n");
		break;

		case DEVFREQ_GOV_INTERVAL:
		sample_ms = (unsigned int )data;
		sample_ms = max(MIN_MS, sample_ms);