From: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Date: Fri, 12 Jan 2018 07:13:53 +0000 (+0530)
Subject: cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin
X-Git-Tag: C0P2-H0.0--20200415~5235
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=9708d4743f317bd0eb12d76f52fc27e2c59d9b6d;p=linux.git

cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin

commit 3fa4680b860bf48b437d6a2c039789c4abe202ae upstream.

Some OpenPOWER boxes can have same pstate values for nominal and
pmin pstates. In these boxes the current code will not initialize
'powernv_pstate_info.min' variable and result in erroneous CPU
frequency reporting. This patch fixes this problem.

Fixes: 09ca4c9b5958 (cpufreq: powernv: Replacing pstate_id with frequency table index)
Reported-by: Alvin Wang <wangat@tw.ibm.com>
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 4.8+ <stable@vger.kernel.org> # 4.8+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index a84724eabfb8..6fb3cd24c1b6 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -260,9 +260,9 @@ static int init_powernv_pstates(void)
 
 		if (id == pstate_max)
 			powernv_pstate_info.max = i;
-		else if (id == pstate_nominal)
+		if (id == pstate_nominal)
 			powernv_pstate_info.nominal = i;
-		else if (id == pstate_min)
+		if (id == pstate_min)
 			powernv_pstate_info.min = i;
 	}