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Date:   Wed, 13 May 2020 10:58:08 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     rui.zhang@...el.com, daniel.lezcano@...aro.org,
        amit.kucheria@...durent.com, 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] thermal: imx8mm: Add get_trend ops

Add get_trend ops for i.MX8MM thermal to apply fast cooling
mechanism, when temperature exceeds passive trip point, the
highest cooling action will be applied, and when temperature
drops to lower than the margin below passive trip point, the
lowest cooling action will be applied.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 drivers/thermal/imx8mm_thermal.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c
index e6061e2..8f6a0b8 100644
--- a/drivers/thermal/imx8mm_thermal.c
+++ b/drivers/thermal/imx8mm_thermal.c
@@ -38,6 +38,8 @@
 #define TMU_VER1		0x1
 #define TMU_VER2		0x2
 
+#define IMX_TEMP_COOL_MARGIN	10000
+
 struct thermal_soc_data {
 	u32 num_sensors;
 	u32 version;
@@ -103,8 +105,33 @@ static int tmu_get_temp(void *data, int *temp)
 	return tmu->socdata->get_temp(data, temp);
 }
 
+static int tmu_get_trend(void *p, int trip, enum thermal_trend *trend)
+{
+	struct tmu_sensor *sensor = p;
+	int trip_temp, temp, ret;
+
+	if (!sensor->tzd)
+		return -EINVAL;
+
+	ret = sensor->tzd->ops->get_trip_temp(sensor->tzd, trip, &trip_temp);
+	if (ret)
+		return ret;
+
+	temp = READ_ONCE(sensor->tzd->temperature);
+
+	if (temp > trip_temp)
+		*trend = THERMAL_TREND_RAISE_FULL;
+	else if (temp < (trip_temp - IMX_TEMP_COOL_MARGIN))
+		*trend = THERMAL_TREND_DROP_FULL;
+	else
+		*trend = THERMAL_TREND_STABLE;
+
+	return 0;
+}
+
 static struct thermal_zone_of_device_ops tmu_tz_ops = {
 	.get_temp = tmu_get_temp,
+	.get_trend = tmu_get_trend,
 };
 
 static void imx8mm_tmu_enable(struct imx8mm_tmu *tmu, bool enable)
-- 
2.7.4

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