linux-kernel - [PATCH v4 09/12] thermal: qoriq: Enable all sensors before registering them

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Message-Id: <20190413082748.29990-10-andrew.smirnov@gmail.com>
Date:   Sat, 13 Apr 2019 01:27:45 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-pm@...r.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Angus Ainslie <angus@...ea.ca>, linux-imx@....com,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 09/12] thermal: qoriq: Enable all sensors before registering them

Tmu_get_temp will get called as a part of sensor registration via
devm_thermal_zone_of_sensor_register(). To prevent it from retruning
bogus data we need to enable sensor monitoring before that. Looking at
the datasheet (i.MX8MQ RM) there doesn't seem to be any harm in
enabling them all, so, for the sake of simplicity, change the code to
do just that.

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Chris Healy <cphealy@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Eduardo Valentin <edubezval@...il.com>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Angus Ainslie (Purism) <angus@...ea.ca>
Cc: linux-imx@....com
Cc: linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/thermal/qoriq_thermal.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
index 9774323a17bf..abbbfe88422e 100644
--- a/drivers/thermal/qoriq_thermal.c
+++ b/drivers/thermal/qoriq_thermal.c
@@ -23,6 +23,7 @@
 #define TMR_DISABLE	0x0
 #define TMR_ME		0x80000000
 #define TMR_ALPF	0x0c000000
+#define TMR_MSITE_ALL	GENMASK(15, 0)
 
 #define REGS_TMTMIR	0x008	/* Temperature measurement interval Register */
 #define TMTMIR_DEFAULT	0x0000000f
@@ -61,28 +62,28 @@ static const struct thermal_zone_of_device_ops tmu_tz_ops = {
 static int qoriq_tmu_register_tmu_zone(struct device *dev,
 				       struct qoriq_tmu_data *qdata)
 {
-	int id, sites = 0;
+	int id, ret;
+
+	regmap_write(qdata->regmap, REGS_TMR,
+		     TMR_MSITE_ALL | TMR_ME | TMR_ALPF);
 
 	for (id = 0; id < SITES_MAX; id++) {
 		struct thermal_zone_device *tzd;
 
 		tzd = devm_thermal_zone_of_sensor_register(dev, id,
 							   qdata, &tmu_tz_ops);
-		if (IS_ERR(tzd)) {
-			if (PTR_ERR(tzd) == -ENODEV)
-				continue;
-			else
-				return PTR_ERR(tzd);
+		ret = PTR_ERR_OR_ZERO(tzd);
+		switch (ret) {
+		case -ENODEV:
+			continue;
+		case 0:
+			break;
+		default:
+			regmap_write(qdata->regmap, REGS_TMR, TMR_DISABLE);
+			return ret;
 		}
-
-		sites |= 0x1 << (15 - id);
 	}
 
-	/* Enable monitoring */
-	if (sites != 0)
-		regmap_write(qdata->regmap, REGS_TMR,
-			     sites | TMR_ME | TMR_ALPF);
-
 	return 0;
 }
 
-- 
2.20.1