The Intel Software Development manual defines states the temperature
digital readout as the bits [22:16] of the IA32_[PACKAGE]_THERM_STATUS
registers. In recent processor, however, the range is [23:16]. Use a
model-specific bitmask to extract the temperature readout correctly.
Instead of re-implementing model checks, extract the correct bitmask
using the intel_tcc library. Add an 'imply' weak reverse dependency on
CONFIG_INTEL_TCC. This captures the dependency and lets user to unselect
them if they are so inclined. In such case, the bitmask used for the
digital readout is [22:16] as specified in the Intel Software Developer's
manual.
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
---
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: Lukasz Luba <lukasz.luba@xxxxxxx>
Cc: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Cc: linux-hwmon@xxxxxxxxxxxxxxx
Cc: linux-pm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx # v6.7+
---
drivers/hwmon/Kconfig | 1 +
drivers/hwmon/coretemp.c | 6 +++++-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 83945397b6eb..11d72b3009bf 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -847,6 +847,7 @@ config SENSORS_I5500
config SENSORS_CORETEMP
tristate "Intel Core/Core2/Atom temperature sensor"
depends on X86
+ imply INTEL_TCC
help
If you say yes here you get support for the temperature
sensor inside your CPU. Most of the family 6 CPUs
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 616bd1a5b864..5632e1b1dfb1 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -17,6 +17,7 @@
#include <linux/sysfs.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
+#include <linux/intel_tcc.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/platform_device.h>
@@ -404,6 +405,8 @@ static ssize_t show_temp(struct device *dev,
tjmax = get_tjmax(tdata, dev);
/* Check whether the time interval has elapsed */
if (time_after(jiffies, tdata->last_updated + HZ)) {
+ u32 mask = intel_tcc_get_temp_mask(is_pkg_temp_data(tdata));
+
rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
/*
* Ignore the valid bit. In all observed cases the register
@@ -411,7 +414,7 @@ static ssize_t show_temp(struct device *dev,
* Return it instead of reporting an error which doesn't
* really help at all.
*/
- tdata->temp = tjmax - ((eax >> 16) & 0x7f) * 1000;
+ tdata->temp = tjmax - ((eax >> 16) & mask) * 1000;
tdata->last_updated = jiffies;
}
@@ -838,4 +841,5 @@ module_exit(coretemp_exit)
MODULE_AUTHOR("Rudolf Marek <r.marek@xxxxxxxxxxxx>");
MODULE_DESCRIPTION("Intel Core temperature monitor");
+MODULE_IMPORT_NS(INTEL_TCC);
MODULE_LICENSE("GPL");
--
2.34.1
