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cpufreq: make probing more robust

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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>
This commit is contained in:
Patrick Bellasi 2015-10-01 17:59:12 +01:00
parent b19d76d4b0
commit cbe80da3a1
1 changed files with 12 additions and 1 deletions
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13
devlib/module/cpufreq.py
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@ -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):