thermal/drivers/mediatek: Add temperature constraints to validate read

The AUXADC thermal v1 allows reading temperature range between -20°C to
150°C and any value out of this range is invalid.

Add new definitions for MT8173_TEMP_{MIN_MAX} and a new small helper
mtk_thermal_temp_is_valid() to check if new readings are in range: if
not, we tell to the API that the reading is invalid by returning
THERMAL_TEMP_INVALID.

It was chosen to introduce the helper function because, even though this
temperature range is realistically ok for all, it comes from a downstream
kernel driver for version 1, but here we also support v2 and v3 which may
may have wider constraints.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20230419061146.22246-3-angelogioacchino.delregno@collabora.com

diff --git a/drivers/thermal/mediatek/auxadc_thermal.c b/drivers/thermal/mediatek/auxadc_thermal.c
index 3c959a8..e908c8e 100644 (file)
--- a/drivers/thermal/mediatek/auxadc_thermal.c
+++ b/drivers/thermal/mediatek/auxadc_thermal.c
@@ -116,6 +116,10 @@
 /* The calibration coefficient of sensor  */
 #define MT8173_CALIBRATION     165
 
+/* Valid temperatures range */
+#define MT8173_TEMP_MIN                -20000
+#define MT8173_TEMP_MAX                150000
+
 /*
  * Layout of the fuses providing the calibration data
  * These macros could be used for MT8183, MT8173, MT2701, and MT2712.
@@ -689,6 +693,11 @@ static const struct mtk_thermal_data mt7986_thermal_data = {
        .version = MTK_THERMAL_V3,
 };
 
+static bool mtk_thermal_temp_is_valid(int temp)
+{
+       return (temp >= MT8173_TEMP_MIN) && (temp <= MT8173_TEMP_MAX);
+}
+
 /**
  * raw_to_mcelsius_v1 - convert a raw ADC value to mcelsius
  * @mt:        The thermal controller
@@ -815,14 +824,17 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
                temp = mt->raw_to_mcelsius(
                        mt, conf->bank_data[bank->id].sensors[i], raw);
 
-
                /*
-                * The first read of a sensor often contains very high bogus
-                * temperature value. Filter these out so that the system does
-                * not immediately shut down.
+                * Depending on the filt/sen intervals and ADC polling time,
+                * we may need up to 60 milliseconds after initialization: this
+                * will result in the first reading containing an out of range
+                * temperature value.
+                * Validate the reading to both address the aforementioned issue
+                * and to eventually avoid bogus readings during runtime in the
+                * event that the AUXADC gets unstable due to high EMI, etc.
                 */
-               if (temp > 200000)
-                       temp = 0;
+               if (!mtk_thermal_temp_is_valid(temp))
+                       temp = THERMAL_TEMP_INVALID;
 
                if (temp > max)
                        max = temp;