linux-kernel - [PATCH] cpufreq: imx-cpufreq-dt: Assign max supported frequency as suspend frequency

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Message-Id: <20190708074624.910-1-Anson.Huang@nxp.com>
Date:   Mon,  8 Jul 2019 15:46:24 +0800
From:   Anson.Huang@....com
To:     rjw@...ysocki.net, viresh.kumar@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH] cpufreq: imx-cpufreq-dt: Assign max supported frequency as suspend frequency

From: Anson Huang <Anson.Huang@....com>

To reduce the suspend/resume latency, CPU's max supported frequency
should be used during low level suspend/resume phase, "opp-suspend"
property is NOT feasible since OPP defined in DT could be NOT supported
according to speed garding and market segment fuse settings. So we
can assign the cpufreq policy's suspend_freq with max available
frequency provided by cpufreq driver.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 drivers/cpufreq/imx-cpufreq-dt.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/cpufreq/imx-cpufreq-dt.c b/drivers/cpufreq/imx-cpufreq-dt.c
index 4f85f31..b6607e8 100644
--- a/drivers/cpufreq/imx-cpufreq-dt.c
+++ b/drivers/cpufreq/imx-cpufreq-dt.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/cpu.h>
+#include <linux/cpufreq.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -84,6 +85,16 @@ static int imx_cpufreq_dt_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int __init imx_cpufreq_dt_setup_suspend_opp(void)
+{
+	struct cpufreq_policy *policy = cpufreq_cpu_get(0);
+
+	policy->suspend_freq = cpufreq_quick_get_max(0);
+
+	return 0;
+}
+late_initcall(imx_cpufreq_dt_setup_suspend_opp);
+
 static struct platform_driver imx_cpufreq_dt_driver = {
 	.probe = imx_cpufreq_dt_probe,
 	.remove = imx_cpufreq_dt_remove,
-- 
2.7.4