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powercap / intel_rapl: relax sanity check on energy counters 

Some RAPL domains may not be active at the time driver is being
loaded. Checking energy counter increment may be too strict and
time consuming. So relax the sanity check on energy counters of
these domains.

Otherwise, they may be ignored and become unavailable to the
powercap framework.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Jacob Pan 2014-02-10 06:11:51 -08:00 committed by Rafael J. Wysocki
parent b28a960c42
commit 7b8747725d
1 changed files with 5 additions and 0 deletions
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5
drivers/powercap/intel_rapl.c
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@ -1147,6 +1147,11 @@ static int rapl_check_domain(int cpu, int domain)
if (rdmsrl_safe_on_cpu(cpu, msr, &val1))
return -ENODEV;
/* PP1/uncore/graphics domain may not be active at the time of
* driver loading. So skip further checks.
*/
if (domain == RAPL_DOMAIN_PP1)
return 0;
/* energy counters roll slowly on some domains */
while (++retry < 10) {
usleep_range(10000, 15000);