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| author | Jean Delvare <khali@linux-fr.org> | 2011-09-16 21:24:02 +0200 |
|---|---|---|
| committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-09-21 17:25:18 -0700 |
| commit | a45a8c8571c0be6a6bd72ae5a14255c26b14b504 (patch) | |
| tree | 47593c6b73c9a68dce03b57e7a387f94f441b8bb /Documentation | |
| parent | 6bf9e9b09c3abb5447bbbf16c2d0cbe721e44f3f (diff) | |
| download | lwn-a45a8c8571c0be6a6bd72ae5a14255c26b14b504.tar.gz lwn-a45a8c8571c0be6a6bd72ae5a14255c26b14b504.zip | |
hwmon: (coretemp) Let the user force TjMax
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 <khali@linux-fr.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: "R, Durgadoss" <durgadoss.r@intel.com>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Alexander Stein <alexander.stein@systec-electronic.com>
Acked-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/hwmon/coretemp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp index fa8776ab9b18..49c0d42dde86 100644 --- a/Documentation/hwmon/coretemp +++ b/Documentation/hwmon/coretemp @@ -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 |