From cbe80da3a113cc4325feb3348e69790d6dafdd8f Mon Sep 17 00:00:00 2001
From: Patrick Bellasi <patrick.bellasi@arm.com>
Date: Thu, 1 Oct 2015 17:59:12 +0100
Subject: [PATCH] cpufreq: make probing more robust
On some machines, when a different CPUFreq policy could be configured
for each CPU, there is not a top-level 'cpufreq' folder exposed
at top level but just per-CPU ones.
This patch makes the probing for CPUFreq support more robust by checking
on all the supported paths.
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
---
devlib/module/cpufreq.py | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/devlib/module/cpufreq.py b/devlib/module/cpufreq.py
index 9aeebe8..a41cff2 100644
--- a/devlib/module/cpufreq.py
+++ b/devlib/module/cpufreq.py
@@ -29,9 +29,20 @@ class CpufreqModule(Module):
@staticmethod
def probe(target):
- path = '/sys/devices/system/cpu/cpufreq'
+
+ # x86 with Intel P-State driver
if target.abi == 'x86_64':
path = '/sys/devices/system/cpu/intel_pstate'
+ if target.file_exists(path):
+ return True
+
+ # Generic CPUFreq support (single policy)
+ path = '/sys/devices/system/cpu/cpufreq'
+ if target.file_exists(path):
+ return True
+
+ # Generic CPUFreq support (per CPU policy)
+ path = '/sys/devices/system/cpu/cpu0/cpufreq'
return target.file_exists(path)
def __init__(self, target):