From: Thomas Renninger <trenn@suse.de>
Subject: Avoid critical temp shutdowns on specific ThinkPad T4x(p) and R40
References: https://bugzilla.novell.com/show_bug.cgi?id=333043
Patch-mainline: not yet, <jeffm: awaiting feedback from trenn, Oct 4, 2017>

---
 drivers/acpi/thermal.c | 92 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -23,6 +23,7 @@
 #include <linux/kmod.h>
 #include <linux/reboot.h>
 #include <linux/device.h>
+#include <linux/dmi.h>
 #include <linux/thermal.h>
 #include <linux/acpi.h>
 #include <linux/workqueue.h>
@@ -1023,6 +1024,85 @@ static void acpi_thermal_check_fn(struct work_struct *work)
 	acpi_thermal_check(tz);
 }
 
+static struct dmi_system_id thermal_psv_dmi_table[] = {
+	{
+		.ident = "IBM ThinkPad T41",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+			DMI_MATCH(DMI_PRODUCT_VERSION,"ThinkPad T41"),
+		},
+	},
+	{
+		.ident = "IBM ThinkPad T42",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+			DMI_MATCH(DMI_PRODUCT_VERSION,"ThinkPad T42"),
+		},
+	},
+	{
+		.ident = "IBM ThinkPad T43",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+			DMI_MATCH(DMI_PRODUCT_VERSION,"ThinkPad T43"),
+		},
+	},
+	{
+		.ident = "IBM ThinkPad T41p",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+			DMI_MATCH(DMI_PRODUCT_VERSION,"ThinkPad T41p"),
+		},
+	},
+	{
+		.ident = "IBM ThinkPad T42p",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+			DMI_MATCH(DMI_PRODUCT_VERSION,"ThinkPad T42p"),
+		},
+	},
+	{
+		.ident = "IBM ThinkPad T43p",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+			DMI_MATCH(DMI_PRODUCT_VERSION,"ThinkPad T43p"),
+		},
+	},
+	{
+		.ident = "IBM ThinkPad R40",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+			DMI_MATCH(DMI_PRODUCT_VERSION,"ThinkPad R40"),
+		},
+	},
+	{
+		.ident = "IBM ThinkPad R50p",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+			DMI_MATCH(DMI_PRODUCT_VERSION,"ThinkPad R50p"),
+		},
+	},
+	{},
+};
+
+static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
+{
+	if (!tz)
+		return -EINVAL;
+
+	/* Convert value to deci-seconds */
+	tz->polling_frequency = seconds * 10;
+
+	tz->thermal_zone->polling_delay = seconds * 1000;
+
+	thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			  "Polling frequency set to %lu seconds\n",
+			  tz->polling_frequency/10));
+
+	return 0;
+}
+
 static int acpi_thermal_add(struct acpi_device *device)
 {
 	int result = 0;
@@ -1052,6 +1132,18 @@ static int acpi_thermal_add(struct acpi_device *device)
 	if (result)
 		goto free_memory;
 
+	if (dmi_check_system(thermal_psv_dmi_table)) {
+		if (tz->trips.passive.flags.valid &&
+		    tz->trips.passive.temperature > celsius_to_deci_kelvin(85)) {
+			printk (KERN_INFO "Adjust passive trip point from %lu"
+				" to %lu\n",
+				deci_kelvin_to_celsius(tz->trips.passive.temperature),
+				deci_kelvin_to_celsius(tz->trips.passive.temperature - 150));
+			tz->trips.passive.temperature -= 150;
+			acpi_thermal_set_polling(tz, 5);
+		}
+	}
+
 	INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
 
 	pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),