This is a backport of a2291badc355d58ead5c19ae0609468947416040 from thermal-soc
accepted upstream.
The IMX6Q/IMX6DL SoC's have a 2-bit temperature grade stored in OTP. Instead
of assuming 85C for passive cooling threshold and 100C for critical base
these thresholds off the thermal gade max CPU temperature:
- passive threshold: max - 10C
- critical threshold: max - 5C
Signed-off-by: Tim Harvey <thar...@gateworks.com>
---
...l-use-cpu-temperature-grade-info-for-thresholds | 112 +++++++++++++++++++++
1 file changed, 112 insertions(+)
create mode 100644
target/linux/imx6/patches-4.1/045-imx-thermal-use-cpu-temperature-grade-info-for-thresholds
diff --git
a/target/linux/imx6/patches-4.1/045-imx-thermal-use-cpu-temperature-grade-info-for-thresholds
b/target/linux/imx6/patches-4.1/045-imx-thermal-use-cpu-temperature-grade-info-for-thresholds
new file mode 100644
index 0000000..44f1b0f
--- /dev/null
+++
b/target/linux/imx6/patches-4.1/045-imx-thermal-use-cpu-temperature-grade-info-for-thresholds
@@ -0,0 +1,112 @@
+--- 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() */
+ unsigned long temp_passive;
+ unsigned long temp_critical;
++ unsigned long temp_max;
+ unsigned long alarm_temp;
+ unsigned long 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,
+@@ -286,10 +283,12 @@ static int imx_set_trip_temp(struct ther
+ {
+ struct imx_thermal_data *data = tz->devdata;
+
++ /* do not allow changing critical threshold */
+ if (trip == IMX_TRIP_CRITICAL)
+ return -EPERM;
+
+- if (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 pl
+ 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;
+ }
+@@ -559,6 +580,11 @@ static int imx_thermal_probe(struct plat
+ return ret;
+ }
+
++ dev_info(&pdev->dev, "%s CPU temperature grade - max:%ldC"
++ " critical:%ldC passive:%ldC\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 */
--
1.9.1
_______________________________________________
openwrt-devel mailing list
openwrt-devel@lists.openwrt.org
https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
