From 5021282cc483d4126c1704942adb74806f7d15d6 Mon Sep 17 00:00:00 2001 From: Seiichi Ikarashi Date: Wed, 19 Aug 2015 14:26:03 +0900 Subject: [PATCH] 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 Signed-off-by: Rafael J. Wysocki --- drivers/powercap/intel_rapl.c | 6 ++++-- 1 file 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; -- 2.20.1