diff options
| author | Yuxuan Shui <yshuiv7@gmail.com> | 2013-11-18 08:06:35 +0100 |
|---|---|---|
| committer | Zhang Rui <rui.zhang@intel.com> | 2014-01-03 15:49:50 +0100 |
| commit | 7734e3ac89b27caf87d43d264bbbc26240413227 (patch) | |
| tree | 2893113507191526c2554ff557a5dd7157bd83d5 /drivers/thermal | |
| parent | Thermal cpu cooling: return error if no valid cpu frequency entry (diff) | |
| download | linux-7734e3ac89b27caf87d43d264bbbc26240413227.tar.xz linux-7734e3ac89b27caf87d43d264bbbc26240413227.zip | |
intel_powerclamp: Fix cstate counter detection.
Having all zero cstate count doesn't necesserily mean the cstate
counter is no functional.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/intel_powerclamp.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/thermal/intel_powerclamp.c b/drivers/thermal/intel_powerclamp.c index 8f181b3f842b..67b608ef2cb2 100644 --- a/drivers/thermal/intel_powerclamp.c +++ b/drivers/thermal/intel_powerclamp.c @@ -206,6 +206,15 @@ static void find_target_mwait(void) } +static bool has_pkg_state_counter(void) +{ + u64 tmp; + return !rdmsrl_safe(MSR_PKG_C2_RESIDENCY, &tmp) || + !rdmsrl_safe(MSR_PKG_C3_RESIDENCY, &tmp) || + !rdmsrl_safe(MSR_PKG_C6_RESIDENCY, &tmp) || + !rdmsrl_safe(MSR_PKG_C7_RESIDENCY, &tmp); +} + static u64 pkg_state_counter(void) { u64 val; @@ -500,7 +509,7 @@ static int start_power_clamp(void) struct task_struct *thread; /* check if pkg cstate counter is completely 0, abort in this case */ - if (!pkg_state_counter()) { + if (!has_pkg_state_counter()) { pr_err("pkg cstate counter not functional, abort\n"); return -EINVAL; } |