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From: Perry Yuan <perry.yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>,
	<ray.huang@amd.com>, <viresh.kumar@linaro.org>
Cc: <Deepak.Sharma@amd.com>, <Nathan.Fontenot@amd.com>,
	<Alexander.Deucher@amd.com>, <Shimmer.Huang@amd.com>,
	<Xiaojian.Du@amd.com>, <Li.Meng@amd.com>, <wyes.karny@amd.com>,
	<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v12 06/11] cpufreq: amd-pstate: implement suspend and resume callbacks
Date: Tue, 31 Jan 2023 17:00:11 +0800	[thread overview]
Message-ID: <20230131090016.3970625-7-perry.yuan@amd.com> (raw)
In-Reply-To: <20230131090016.3970625-1-perry.yuan@amd.com>

From: Perry Yuan <Perry.Yuan@amd.com>

add suspend and resume support for the AMD processors by amd_pstate_epp
driver instance.

When the CPPC is suspended, EPP driver will set EPP profile to 'power'
profile and set max/min perf to lowest perf value.
When resume happens, it will restore the MSR registers with
previous cached value.

Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <Mario.Limonciello@amd.com>
Reviewed-by: Wyes Karny <wyes.karny@amd.com>
Tested-by: Wyes Karny <wyes.karny@amd.com>
Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
---
 drivers/cpufreq/amd-pstate.c | 40 ++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 26f6ac83d87e..4e3770e0d4d3 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -1087,6 +1087,44 @@ static int amd_pstate_epp_verify_policy(struct cpufreq_policy_data *policy)
 	return 0;
 }
 
+static int amd_pstate_epp_suspend(struct cpufreq_policy *policy)
+{
+	struct amd_cpudata *cpudata = policy->driver_data;
+	int ret;
+
+	/* avoid suspending when EPP is not enabled */
+	if (cppc_state != AMD_PSTATE_ACTIVE)
+		return 0;
+
+	/* set this flag to avoid setting core offline*/
+	cpudata->suspended = true;
+
+	/* disable CPPC in lowlevel firmware */
+	ret = amd_pstate_enable(false);
+	if (ret)
+		pr_err("failed to suspend, return %d\n", ret);
+
+	return 0;
+}
+
+static int amd_pstate_epp_resume(struct cpufreq_policy *policy)
+{
+	struct amd_cpudata *cpudata = policy->driver_data;
+
+	if (cpudata->suspended) {
+		mutex_lock(&amd_pstate_limits_lock);
+
+		/* enable amd pstate from suspend state*/
+		amd_pstate_epp_reenable(cpudata);
+
+		mutex_unlock(&amd_pstate_limits_lock);
+
+		cpudata->suspended = false;
+	}
+
+	return 0;
+}
+
 static struct cpufreq_driver amd_pstate_driver = {
 	.flags		= CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
 	.verify		= amd_pstate_verify,
@@ -1108,6 +1146,8 @@ static struct cpufreq_driver amd_pstate_epp_driver = {
 	.exit		= amd_pstate_epp_cpu_exit,
 	.offline	= amd_pstate_epp_cpu_offline,
 	.online		= amd_pstate_epp_cpu_online,
+	.suspend	= amd_pstate_epp_suspend,
+	.resume		= amd_pstate_epp_resume,
 	.name		= "amd_pstate_epp",
 	.attr		= amd_pstate_epp_attr,
 };
-- 
2.34.1


  parent reply	other threads:[~2023-01-31  9:07 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-31  9:00 [PATCH v12 00/11] Implement AMD Pstate EPP Driver Perry Yuan
2023-01-31  9:00 ` [PATCH v12 01/11] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2023-01-31  9:00 ` [PATCH v12 02/11] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2023-01-31  9:00 ` [PATCH v12 03/11] cpufreq: amd-pstate: optimize driver working mode selection in amd_pstate_param() Perry Yuan
2023-01-31  9:00 ` [PATCH v12 04/11] cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2023-01-31  9:00 ` [PATCH v12 05/11] cpufreq: amd-pstate: implement amd pstate cpu online and offline callback Perry Yuan
2023-01-31  9:00 ` Perry Yuan [this message]
2023-01-31  9:00 ` [PATCH v12 07/11] cpufreq: amd-pstate: add driver working mode switch support Perry Yuan
2023-01-31  9:00 ` [PATCH v12 08/11] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2023-01-31  9:00 ` [PATCH v12 09/11] Documentation: introduce amd pstate active mode kernel command line options Perry Yuan
2023-01-31  9:00 ` [PATCH v12 10/11] cpufreq: amd-pstate: convert sprintf with sysfs_emit() Perry Yuan
2023-01-31  9:00 ` [PATCH v12 11/11] Documentation: amd-pstate: introduce new global sysfs attributes Perry Yuan
2023-01-31 12:36 ` [PATCH v12 00/11] Implement AMD Pstate EPP Driver Muhammad Usama Anjum
2023-02-03 21:03 ` Rafael J. Wysocki
2023-02-06  2:57   ` Yuan, Perry

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