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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 /drivers | |
| parent | 6bf9e9b09c3abb5447bbbf16c2d0cbe721e44f3f (diff) | |
| download | linux-a45a8c8571c0be6a6bd72ae5a14255c26b14b504.tar.gz linux-a45a8c8571c0be6a6bd72ae5a14255c26b14b504.tar.bz2 linux-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 'drivers')
| -rw-r--r-- | drivers/hwmon/coretemp.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index 256f70803eb3..5a41e9dda909 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -36,11 +36,20 @@ #include <linux/cpu.h> #include <linux/pci.h> #include <linux/smp.h> +#include <linux/moduleparam.h> #include <asm/msr.h> #include <asm/processor.h> #define DRVNAME "coretemp" +/* + * force_tjmax only matters when TjMax can't be read from the CPU itself. + * When set, it replaces the driver's suboptimal heuristic. + */ +static int force_tjmax; +module_param_named(tjmax, force_tjmax, int, 0444); +MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius"); + #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */ #define NUM_REAL_CORES 16 /* Number of Real cores per cpu */ #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */ @@ -398,6 +407,12 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) } } + if (force_tjmax) { + dev_notice(dev, "TjMax forced to %d degrees C by user\n", + force_tjmax); + return force_tjmax * 1000; + } + /* * An assumption is made for early CPUs and unreadable MSR. * NOTE: the calculated value may not be correct. |