• Guenter Roeck's avatar
    hwmon: (coretemp) Don't use threshold registers for tempX_max · f4af6fd6
    Guenter Roeck authored
    With commit c814a4c7, the meaning of tempX_max
    was changed. It no longer returns the value of bits 8:15 of
    MSR_IA32_TEMPERATURE_TARGET, but instead returns the value of CPU threshold
    register T1. tempX_max_hyst was added to reflect the value of temperature
    threshold register T0.
    
    As it turns out, T0 and T1 are used on some systems, presumably by the BIOS.
    Also, T0 and T1 don't have a well defined meaning. The thresholds may be used
    as upper or lower limits, and it is not guaranteed that T0 <= T1. Thus, the new
    attribute mapping does not reflect the actual usage of the threshold registers.
    Also, register contents are changed during runtime by an entity other than the
    hwmon driver, meaning the values cached by the driver do not reflect actual
    register contents.
    
    Revert most of c814a4c7 to address the problem.
    Support for T0 and T1 will be added back in with a separate commit, using new
    attribute names.
    Signed-off-by: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: Durgadoss R <durgadoss.r@intel.com>
    Acked-by: default avatarJean Delvare <khali@linux-fr.org>
    f4af6fd6
coretemp 4.59 KB