linux-kernel - [PATCH 5.18 019/102] cpufreq: amd-pstate: Add resume and suspend callbacks

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Message-Id: <20220705115618.964128291@linuxfoundation.org>
Date:   Tue,  5 Jul 2022 13:57:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jinzhou Su <Jinzhou.Su@....com>,
        Huang Rui <ray.huang@....com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.18 019/102] cpufreq: amd-pstate: Add resume and suspend callbacks

From: Jinzhou Su <Jinzhou.Su@....com>

commit b376471fb47d4905e72fe73e9eeed228f8f2f230 upstream.

When system resumes from S3, the CPPC enable register will be
cleared and reset to 0.

So enable the CPPC interface by writing 1 to this register on
system resume and disable it during system suspend.

Signed-off-by: Jinzhou Su <Jinzhou.Su@....com>
Signed-off-by: Jinzhou Su <Jinzhou.Su@....com>
Acked-by: Huang Rui <ray.huang@....com>
[ rjw: Subject and changelog edits ]
Cc: All applicable <stable@...r.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/cpufreq/amd-pstate.c |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -566,6 +566,28 @@ static int amd_pstate_cpu_exit(struct cp
 	return 0;
 }
 
+static int amd_pstate_cpu_resume(struct cpufreq_policy *policy)
+{
+	int ret;
+
+	ret = amd_pstate_enable(true);
+	if (ret)
+		pr_err("failed to enable amd-pstate during resume, return %d\n", ret);
+
+	return ret;
+}
+
+static int amd_pstate_cpu_suspend(struct cpufreq_policy *policy)
+{
+	int ret;
+
+	ret = amd_pstate_enable(false);
+	if (ret)
+		pr_err("failed to disable amd-pstate during suspend, return %d\n", ret);
+
+	return ret;
+}
+
 /* Sysfs attributes */
 
 /*
@@ -636,6 +658,8 @@ static struct cpufreq_driver amd_pstate_
 	.target		= amd_pstate_target,
 	.init		= amd_pstate_cpu_init,
 	.exit		= amd_pstate_cpu_exit,
+	.suspend	= amd_pstate_cpu_suspend,
+	.resume		= amd_pstate_cpu_resume,
 	.set_boost	= amd_pstate_set_boost,
 	.name		= "amd-pstate",
 	.attr           = amd_pstate_attr,