powercap/intel_rapl: Fix domain detection

As only the low 32 bits of the RAPL_DOMAIN_REG_STATUS register
represents the energy counter, and the high 32 bits are reserved,
detect the existence of a RAPL domain by checking the low 32 bits only.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
index 983d75b..2651ea6 100644 (file)
--- a/drivers/powercap/intel_rapl_common.c
+++ b/drivers/powercap/intel_rapl_common.c
@@ -1228,7 +1228,7 @@ static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp)
         * values, otherwise skip it.
         */
 
-       ra.mask = ~0;
+       ra.mask = ENERGY_STATUS_MASK;
        if (rp->priv->read_raw(cpu, &ra) || !ra.value)
                return -ENODEV;