diff options
| author | Venkatesh Pallipadi <venki@google.com> | 2012-02-03 22:22:25 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-02-04 22:23:17 +0100 |
| commit | d020283dc694c9ec31b410f522252f7a8397e67d (patch) | |
| tree | 50ffaf8d59d5f7951f09f7b61eac584f64b7ad96 | |
| parent | 379e0be812ab8a2a351e784b0c987788f5123090 (diff) | |
PM / QoS: CPU C-state breakage with PM Qos change
Looks like change "PM QoS: Move and rename the implementation files"
merged during the 3.2 development cycle made PM QoS depend on
CONFIG_PM which depends on (PM_SLEEP || PM_RUNTIME).
That breaks CPU C-states with kernels not having these CONFIGs, causing CPUs
to spend time in Polling loop idle instead of going into deep C-states,
consuming way way more power. This is with either acpi idle or intel idle
enabled.
Either CONFIG_PM should be enabled with any pm_qos users or
the !CONFIG_PM pm_qos_request() should return sane defaults not to break
the existing users. Here's is the patch for the latter option.
[rjw: Modified the changelog slightly.]
Signed-off-by: Venkatesh Pallipadi <venki@google.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: stable@vger.kernel.org
| -rw-r--r-- | include/linux/pm_qos.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index e5bbcbaa6f5..4d99e4e6ef8 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -110,7 +110,19 @@ static inline void pm_qos_remove_request(struct pm_qos_request *req) { return; } static inline int pm_qos_request(int pm_qos_class) - { return 0; } +{ + switch (pm_qos_class) { + case PM_QOS_CPU_DMA_LATENCY: + return PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; + case PM_QOS_NETWORK_LATENCY: + return PM_QOS_NETWORK_LAT_DEFAULT_VALUE; + case PM_QOS_NETWORK_THROUGHPUT: + return PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE; + default: + return PM_QOS_DEFAULT_VALUE; + } +} + static inline int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier) { return 0; } |