linux-kernel - [PATCH] PM: sleep: call devfreq_suspend/resume and cpufreq

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Date:   Wed, 22 Apr 2020 13:15:29 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Vincent Wang <vincent.wang@...soc.com>,
        Samer Xie <samer.xie@...soc.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>
Subject: [PATCH] PM: sleep: call devfreq_suspend/resume and cpufreq_suspend/resume in pairs.

From: Vincent Wang <vincent.wang@...soc.com>

If dpm_prepare() fails in dpm_suspend_start(), dpm_suspend() can't be
called. And then, devfreq_suspend() and cpufreq_suspend() will not be
called in the suspend flow.

But in the resiume flow, devfreq_resume() and cpufreq_resume() will
be called.

This patch will ensure that devfreq_suspend/devfreq_resume and
cpufreq_suspend/cpufreq_resume are called in pairs.

Signed-off-by: Vincent Wang <vincent.wang@...soc.com>
Signed-off-by: Samer Xie <samer.xie@...soc.com>
Signed-off-by: Chunyan Zhang <zhang.lyra@...il.com>
---
 drivers/base/power/main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index fdd508a78ffd..eb3d987d43e0 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -1866,9 +1866,6 @@ int dpm_suspend(pm_message_t state)
 	trace_suspend_resume(TPS("dpm_suspend"), state.event, true);
 	might_sleep();
 
-	devfreq_suspend();
-	cpufreq_suspend();
-
 	mutex_lock(&dpm_list_mtx);
 	pm_transition = state;
 	async_error = 0;
@@ -1988,6 +1985,9 @@ int dpm_prepare(pm_message_t state)
 	trace_suspend_resume(TPS("dpm_prepare"), state.event, true);
 	might_sleep();
 
+	devfreq_suspend();
+	cpufreq_suspend();
+
 	/*
 	 * Give a chance for the known devices to complete their probes, before
 	 * disable probing of devices. This sync point is important at least
-- 
2.20.1