imx6: imx: thermal: use CPU temperature grade info for thresholds
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 <tharvey@gateworks.com> SVN-Revision: 48011
This commit is contained in:
Luka Perkov
parent
f0070d495e
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158b5b4231
1 changed files with 114 additions and 0 deletions
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@ -0,0 +1,114 @@
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Index: linux-4.3/drivers/thermal/imx_thermal.c
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===================================================================
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--- linux-4.3.orig/drivers/thermal/imx_thermal.c 2015-11-01 16:05:25.000000000 -0800
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+++ linux-4.3/drivers/thermal/imx_thermal.c 2015-12-18 10:39:44.915158318 -0800
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@@ -55,6 +55,7 @@
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#define TEMPSENSE2_PANIC_VALUE_SHIFT 16
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#define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
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+#define OCOTP_MEM0 0x0480
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#define OCOTP_ANA1 0x04e0
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/* The driver supports 1 passive trip point and 1 critical trip point */
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@@ -64,12 +65,6 @@
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IMX_TRIP_NUM,
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};
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-/*
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- * It defines the temperature in millicelsius for passive trip point
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- * that will trigger cooling action when crossed.
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- */
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-#define IMX_TEMP_PASSIVE 85000
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-
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#define IMX_POLLING_DELAY 2000 /* millisecond */
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#define IMX_PASSIVE_DELAY 1000
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@@ -100,12 +95,14 @@
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u32 c1, c2; /* See formula in imx_get_sensor_data() */
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int temp_passive;
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int temp_critical;
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+ unsigned long temp_max;
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int alarm_temp;
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int last_temp;
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bool irq_enabled;
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int irq;
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struct clk *thermal_clk;
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const struct thermal_soc_data *socdata;
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+ const char *temp_grade;
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};
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static void imx_set_panic_temp(struct imx_thermal_data *data,
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@@ -285,10 +282,12 @@
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{
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struct imx_thermal_data *data = tz->devdata;
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+ /* do not allow changing critical threshold */
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if (trip == IMX_TRIP_CRITICAL)
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return -EPERM;
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- if (temp > IMX_TEMP_PASSIVE)
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+ /* do not allow passive to be set higher than critical */
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+ if (temp < 0 || temp > data->temp_critical)
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return -EINVAL;
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data->temp_passive = temp;
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@@ -404,17 +403,39 @@
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data->c1 = temp64;
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data->c2 = n1 * data->c1 + 1000 * t1;
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- /*
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- * Set the default passive cooling trip point,
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- * can be changed from userspace.
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- */
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- data->temp_passive = IMX_TEMP_PASSIVE;
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+ /* use OTP for thermal grade */
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+ ret = regmap_read(map, OCOTP_MEM0, &val);
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+ if (ret) {
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+ dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret);
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+ return ret;
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+ }
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+
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+ /* The maximum die temp is specified by the Temperature Grade */
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+ switch ((val >> 6) & 0x3) {
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+ case 0: /* Commercial (0 to 95C) */
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+ data->temp_grade = "Commercial";
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+ data->temp_max = 95000;
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+ break;
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+ case 1: /* Extended Commercial (-20 to 105C) */
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+ data->temp_grade = "Extended Commercial";
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+ data->temp_max = 105000;
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+ break;
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+ case 2: /* Industrial (-40 to 105C) */
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+ data->temp_grade = "Industrial";
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+ data->temp_max = 105000;
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+ break;
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+ case 3: /* Automotive (-40 to 125C) */
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+ data->temp_grade = "Automotive";
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+ data->temp_max = 125000;
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+ break;
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+ }
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/*
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- * The maximum die temperature set to 20 C higher than
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- * IMX_TEMP_PASSIVE.
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+ * Set the critical trip point at 5C under max
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+ * Set the passive trip point at 10C under max (can change via sysfs)
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*/
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- data->temp_critical = 1000 * 20 + data->temp_passive;
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+ data->temp_critical = data->temp_max - (1000 * 5);
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+ data->temp_passive = data->temp_max - (1000 * 10);
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return 0;
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}
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@@ -559,6 +580,11 @@
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return ret;
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}
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+ dev_info(&pdev->dev, "%s CPU temperature grade - max:%ldC"
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+ " critical:%ldC passive:%ldC\n", data->temp_grade,
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+ data->temp_max / 1000, data->temp_critical / 1000,
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+ data->temp_passive / 1000);
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+
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/* Enable measurements at ~ 10 Hz */
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regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
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measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
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