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intel_powerclamp: Fix cstate counter detection.

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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>
This commit is contained in:
Yuxuan Shui 2013-11-18 15:06:35 +08:00 committed by Zhang Rui
parent a116776f7b
commit 7734e3ac89
1 changed files with 10 additions and 1 deletions
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11
drivers/thermal/intel_powerclamp.c
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@ -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;
}