1 files changed, 41 insertions, 15 deletions

diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index c8fe3cac2e0e..c5547bd711db 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -55,6 +55,7 @@
 #define TEMPSENSE2_PANIC_VALUE_SHIFT    16
 #define TEMPSENSE2_PANIC_VALUE_MASK     0xfff0000
 
+#define OCOTP_MEM0                      0x0480
 #define OCOTP_ANA1                      0x04e0
 
 /* The driver supports 1 passive trip point and 1 critical trip point */
@@ -64,12 +65,6 @@ enum imx_thermal_trip {
         IMX_TRIP_NUM,
 };
 
-/*
- * It defines the temperature in millicelsius for passive trip point
- * that will trigger cooling action when crossed.
- */
-#define IMX_TEMP_PASSIVE                85000
-
 #define IMX_POLLING_DELAY               2000 /* millisecond */
 #define IMX_PASSIVE_DELAY               1000
 
@@ -100,12 +95,14 @@ struct imx_thermal_data {
         u32 c1, c2; /* See formula in imx_get_sensor_data() */
         int temp_passive;
         int temp_critical;
+        int temp_max;
         int alarm_temp;
         int last_temp;
         bool irq_enabled;
         int irq;
         struct clk *thermal_clk;
         const struct thermal_soc_data *socdata;
+        const char *temp_grade;
 };
 
 static void imx_set_panic_temp(struct imx_thermal_data *data,
@@ -285,10 +282,12 @@ static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
 {
         struct imx_thermal_data *data = tz->devdata;
 
+        /* do not allow changing critical threshold */
         if (trip == IMX_TRIP_CRITICAL)
                 return -EPERM;
 
-        if (temp < 0 || temp > IMX_TEMP_PASSIVE)
+        /* do not allow passive to be set higher than critical */
+        if (temp < 0 || temp > data->temp_critical)
                 return -EINVAL;
 
         data->temp_passive = temp;
@@ -404,17 +403,39 @@ static int imx_get_sensor_data(struct platform_device *pdev)
         data->c1 = temp64;
         data->c2 = n1 * data->c1 + 1000 * t1;
 
-        /*
-         * Set the default passive cooling trip point,
-         * can be changed from userspace.
-         */
-        data->temp_passive = IMX_TEMP_PASSIVE;
+        /* use OTP for thermal grade */
+        ret = regmap_read(map, OCOTP_MEM0, &val);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret);
+                return ret;
+        }
+
+        /* The maximum die temp is specified by the Temperature Grade */
+        switch ((val >> 6) & 0x3) {
+        case 0: /* Commercial (0 to 95C) */
+                data->temp_grade = "Commercial";
+                data->temp_max = 95000;
+                break;
+        case 1: /* Extended Commercial (-20 to 105C) */
+                data->temp_grade = "Extended Commercial";
+                data->temp_max = 105000;
+                break;
+        case 2: /* Industrial (-40 to 105C) */
+                data->temp_grade = "Industrial";
+                data->temp_max = 105000;
+                break;
+        case 3: /* Automotive (-40 to 125C) */
+                data->temp_grade = "Automotive";
+                data->temp_max = 125000;
+                break;
+        }
 
         /*
-         * The maximum die temperature set to 20 C higher than
-         * IMX_TEMP_PASSIVE.
+         * Set the critical trip point at 5C under max
+         * Set the passive trip point at 10C under max (can change via sysfs)
          */
-        data->temp_critical = 1000 * 20 + data->temp_passive;
+        data->temp_critical = data->temp_max - (1000 * 5);
+        data->temp_passive = data->temp_max - (1000 * 10);
 
         return 0;
 }
@@ -551,6 +572,11 @@ static int imx_thermal_probe(struct platform_device *pdev)
                 return ret;
         }
 
+        dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
+                 " critical:%dC passive:%dC\n", data->temp_grade,
+                 data->temp_max / 1000, data->temp_critical / 1000,
+                 data->temp_passive / 1000);
+
         /* Enable measurements at ~ 10 Hz */
         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */