linux-kernel - [PATCH v4 21/24] PM / devfreq: tegra30: Synchronize average count on target's update

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Date:   Mon,  8 Jul 2019 01:33:00 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 21/24] PM / devfreq: tegra30: Synchronize average count on target's update

The average count may get out of sync if interrupt was disabled / avoided
for a long time due to upper watermark optimization, hence it should be
re-synced on each target's update to ensure that watermarks are set up
correctly on EMC rate-change notification and that a correct frequency
is selected for device.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/devfreq/tegra30-devfreq.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index 4d582809acb6..8a674fad26be 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -466,11 +466,41 @@ static void actmon_isr_device(struct tegra_devfreq *tegra,
 			      dev->boost_freq, cpufreq_get(0));
 }
 
+static void tegra_devfreq_sync_avg_count(struct tegra_devfreq *tegra,
+					 struct tegra_devfreq_device *dev)
+{
+	u32 avg_count, avg_freq, old_upper, new_upper;
+
+	avg_count = device_readl(dev, ACTMON_DEV_AVG_COUNT);
+	avg_freq = avg_count / ACTMON_SAMPLING_PERIOD;
+
+	old_upper = tegra_actmon_upper_freq(tegra, dev->avg_freq);
+	new_upper = tegra_actmon_upper_freq(tegra, avg_freq);
+
+	/* similar to ISR, see comments in actmon_isr_device() */
+	if (old_upper != new_upper) {
+		dev->avg_freq = avg_freq;
+		dev->boost_freq = 0;
+	}
+}
+
 static unsigned long actmon_update_target(struct tegra_devfreq *tegra,
 					  struct tegra_devfreq_device *dev)
 {
 	unsigned long target_freq;
 
+	/*
+	 * The avg_count / avg_freq is getting snapshoted on device's
+	 * interrupt, but there are cases where actual value need to
+	 * be utilized on target's update, like CPUFreq boosting and
+	 * overriding the min freq via /sys/class/devfreq/devfreq0/min_freq
+	 * because we're optimizing the upper watermark based on the
+	 * actual EMC frequency. This means that interrupt may be
+	 * inactive for a long time and thus making snapshoted value
+	 * outdated.
+	 */
+	tegra_devfreq_sync_avg_count(tegra, dev);
+
 	target_freq = min(dev->avg_freq + dev->boost_freq, KHZ_MAX);
 	target_freq = tegra_actmon_account_cpu_freq(tegra, dev, target_freq);
 
-- 
2.22.0