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authorSeiichi Ikarashi <s.ikarashi@jp.fujitsu.com>2015-08-19 08:26:03 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-08-29 02:46:40 +0300
commit5021282cc483d4126c1704942adb74806f7d15d6 (patch)
treeff1238b0000d8acefbe0a4ccca6efd1ef174e5d7
parent4e0bec9e833a6884dc2e242e45e0ebd99f46624e (diff)
downloadlinux-5021282cc483d4126c1704942adb74806f7d15d6.tar.xz
powercap / RAPL: disable the 2nd power limit properly
Let rapl_unregister_powercap() disable the second power limit only if it exists. Intel64 SDM Vol.3 14.9 says that the package domain has it but neither the power plane domain nor the DRAM domain has it. Signed-off-by: Seiichi Ikarashi <s.ikarashi@jp.fujitsu.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/powercap/intel_rapl.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index a5eddfbb0230..5efacd050c7d 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -1147,9 +1147,11 @@ static int rapl_unregister_powercap(void)
pr_debug("remove package, undo power limit on %d: %s\n",
rp->id, rd->name);
rapl_write_data_raw(rd, PL1_ENABLE, 0);
- rapl_write_data_raw(rd, PL2_ENABLE, 0);
rapl_write_data_raw(rd, PL1_CLAMP, 0);
- rapl_write_data_raw(rd, PL2_CLAMP, 0);
+ if (find_nr_power_limit(rd) > 1) {
+ rapl_write_data_raw(rd, PL2_ENABLE, 0);
+ rapl_write_data_raw(rd, PL2_CLAMP, 0);
+ }
if (rd->id == RAPL_DOMAIN_PACKAGE) {
rd_package = rd;
continue;