4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Chen Yu <yu.c.c...@intel.com>
[ Upstream commit 70f6bf2a3b7e40c3f802b0ea837762a8bc6c1430 ]
When maxcpus=1 is in the kernel command line, the BP is responsible
for re-enabling the HWP - because currently only the APs invoke
intel_pstate_hwp_enable() during their online process - which might
put the system into unstable state after resume.
Fix this by enabling the HWP explicitly on BP during resume.
Reported-by: Doug Smythies <dsmyth...@telus.net>
Suggested-by: Srinivas Pandruvada <srinivas.pandruv...@linux.intel.com>
Signed-off-by: Yu Chen <yu.c.c...@intel.com>
[ rjw: Subject/changelog, minor modifications ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/cpufreq/intel_pstate.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -779,6 +779,8 @@ static int intel_pstate_hwp_save_state(s
return 0;
}
+static void intel_pstate_hwp_enable(struct cpudata *cpudata);
+
static int intel_pstate_resume(struct cpufreq_policy *policy)
{
if (!hwp_active)
@@ -786,6 +788,9 @@ static int intel_pstate_resume(struct cp
mutex_lock(&intel_pstate_limits_lock);
+ if (policy->cpu == 0)
+ intel_pstate_hwp_enable(all_cpu_data[policy->cpu]);
+
all_cpu_data[policy->cpu]->epp_policy = 0;
intel_pstate_hwp_set(policy->cpu);
