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hwmon: (coretemp) Refine TjMax detection 

Intel's turbostat code uses only 7 bits from MSR_IA32_TEMPERATURE_TARGET to
read TjMax, and also only accepts it if the reported temperature is at least
85 degrees C. Play safe and do the same.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2013-11-09 09:38:14 -08:00
parent 347c16cfde
commit 9fb6c9c73b
1 changed files with 2 additions and 2 deletions
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4
drivers/hwmon/coretemp.c
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@ -368,12 +368,12 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
if (cpu_has_tjmax(c))
dev_warn(dev, "Unable to read TjMax from CPU %u\n", id);
} else {
val = (eax >> 16) & 0xff;
val = (eax >> 16) & 0x7f;
/*
* If the TjMax is not plausible, an assumption
* will be used
*/
if (val) {
if (val >= 85) {
dev_dbg(dev, "TjMax is %d degrees C\n", val);
return val * 1000;
}