linux-kernel - [PATCH v2 3/6] soc: qcom: rpmpd: Add support for get/set performance state

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Message-Id: <20180525100121.28214-4-rnayak@codeaurora.org>
Date:   Fri, 25 May 2018 15:31:18 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     viresh.kumar@...aro.org, sboyd@...nel.org, andy.gross@...aro.org,
        ulf.hansson@...aro.org
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, collinsd@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH v2 3/6] soc: qcom: rpmpd: Add support for get/set performance state

Add support for the .set_performace_state() and .opp_to_performance_state()
callbacks in the rpmpd driver.

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/soc/qcom/rpmpd.c | 46 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/soc/qcom/rpmpd.c b/drivers/soc/qcom/rpmpd.c
index df6427d43414..ff3d910f388c 100644
--- a/drivers/soc/qcom/rpmpd.c
+++ b/drivers/soc/qcom/rpmpd.c
@@ -14,6 +14,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm_opp.h>
 #include <linux/soc/qcom/smd-rpm.h>
 
 #include <dt-bindings/mfd/qcom-rpm.h>
@@ -29,6 +30,8 @@
 #define KEY_ENABLE		0x6e657773 /* swen */
 #define KEY_FLOOR_CORNER	0x636676   /* vfc */
 
+#define MAX_RPMPD_STATE		6
+
 #define DEFINE_RPMPD_CORN_SMPA(_platform, _name, _active, r_id)		\
 	static struct rpmpd _platform##_##_active;			\
 	static struct rpmpd _platform##_##_name = {			\
@@ -222,6 +225,47 @@ static int rpmpd_power_off(struct generic_pm_domain *domain)
 	return ret;
 }
 
+static int rpmpd_set_performance(struct generic_pm_domain *domain,
+			     unsigned int state)
+{
+	int ret = 0;
+	struct rpmpd *pd = domain_to_rpmpd(domain);
+
+	mutex_lock(&rpmpd_lock);
+
+	if (state > MAX_RPMPD_STATE)
+		goto out;
+
+	pd->corner = state;
+
+	if (!pd->enabled && (pd->key != KEY_FLOOR_CORNER))
+		goto out;
+
+	ret = rpmpd_aggregate_corner(pd);
+
+out:
+	mutex_unlock(&rpmpd_lock);
+
+	return ret;
+}
+
+static unsigned int rpmpd_get_performance(struct generic_pm_domain *genpd,
+					  struct dev_pm_opp *opp)
+{
+	struct device_node *np;
+	unsigned int corner = 0;
+
+	np = dev_pm_opp_get_of_node(opp);
+	if (of_property_read_u32(np, "qcom,level", &corner)) {
+		pr_err("%s: missing 'qcom,level' property\n", __func__);
+		return 0;
+	}
+
+	of_node_put(np);
+
+	return corner;
+}
+
 static int rpmpd_probe(struct platform_device *pdev)
 {
 	int i;
@@ -259,6 +303,8 @@ static int rpmpd_probe(struct platform_device *pdev)
 		rpmpds[i]->rpm = rpm;
 		rpmpds[i]->pd.power_off = rpmpd_power_off;
 		rpmpds[i]->pd.power_on = rpmpd_power_on;
+		rpmpds[i]->pd.set_performance_state = rpmpd_set_performance;
+		rpmpds[i]->pd.opp_to_performance_state = rpmpd_get_performance;
 		pm_genpd_init(&rpmpds[i]->pd, NULL, true);
 
 		data->domains[i] = &rpmpds[i]->pd;
-- 
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