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hwmon: (k8temp) Fix temperature reporting for (most) K8 RevG CPUs

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Current Temperature for K8 RevG desktop CPUs is a "normalized value"
which can be below ambient temperature.

As a consequence lots of RevG systems report temperatures like:

$ sensors
k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:    +17 C
Core0 Temp:     +3 C
Core1 Temp:    +21 C
Core1 Temp:     +5 C

being quite below ambient temperature.
There are even reports of negative temperature values.

This patch corrects the temperature reporting of k8temp for
RevG desktop CPUs.

Cc: Rudolf Marek <r.marek@assembler.cz>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Andreas Herrmann 2009-01-15 22:27:47 +01:00 committed by Jean Delvare
parent a2e066bba2
commit 76ff08da34
1 changed files with 15 additions and 2 deletions
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17
drivers/hwmon/k8temp.c
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@ -49,6 +49,7 @@ struct k8temp_data {
u8 sensorsp; /* sensor presence bits - SEL_CORE & SEL_PLACE */
u32 temp[2][2]; /* core, place */
u8 swap_core_select; /* meaning of SEL_CORE is inverted */
u32 temp_offset;
};
static struct k8temp_data *k8temp_update_device(struct device *dev)
@ -116,13 +117,15 @@ static ssize_t show_temp(struct device *dev,
to_sensor_dev_attr_2(devattr);
int core = attr->nr;
int place = attr->index;
int temp;
struct k8temp_data *data = k8temp_update_device(dev);
if (data->swap_core_select)
core = core ? 0 : 1;
return sprintf(buf, "%d\n",
TEMP_FROM_REG(data->temp[core][place]));
temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
return sprintf(buf, "%d\n", temp);
}
/* core, place */
@ -176,6 +179,16 @@ static int __devinit k8temp_probe(struct pci_dev *pdev,
"wrong - check erratum #141\n");
}
if ((model >= 0x69) &&
!(model == 0xc1 || model == 0x6c || model == 0x7c)) {
/*
* RevG desktop CPUs (i.e. no socket S1G1 parts)
* need additional offset, otherwise reported
* temperature is below ambient temperature
*/
data->temp_offset = 21000;
}
break;
}