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hwmon: (coretemp) Let the user force TjMax

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On old CPUs (and even some recent Atom CPUs) TjMax can't be read from
the CPU registers, so it is guessed by the driver using a complex
heuristic which isn't reliable. So let users who know their CPU's
TjMax pass it as a module parameter.

Signed-off-by: Jean Delvare <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: "R, Durgadoss" <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Alexander Stein <[email protected]>
Acked-by: Fenghua Yu <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Jean Delvare 2011-09-16 21:24:02 +02:00 • committed by Guenter Roeck
commit a45a8c8571
2 changed files with 19 additions and 3 deletions
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7
Documentation/hwmon/coretemp
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@ -49,9 +49,10 @@ tempX_label - Contains string "Core X", where X is processor
number. For Package temp, this will be "Physical id Y",
where Y is the package number.
The TjMax temperature is set to 85 degrees C if undocumented model specific
register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as
(sometimes) documented in processor datasheet.
On CPU models which support it, TjMax is read from a model-specific register.
On other models, it is set to an arbitrary value based on weak heuristics.
If these heuristics don't work for you, you can pass the correct TjMax value
as a module parameter (tjmax).
Appendix A. Known TjMax lists (TBD):
Some information comes from ark.intel.com