diff options
author | Alex Shi <alex.shi@linaro.org> | 2016-08-16 12:07:31 +0800 |
---|---|---|
committer | Alex Shi <alex.shi@linaro.org> | 2016-08-17 16:31:21 +0800 |
commit | 2b8870cc6da843b3e72d7de698e6299a5bf30b8e (patch) | |
tree | df2d6e6ad2abae17b13244a742c4275ad079c7d6 | |
parent | 35d3f6053b6681de3514d4c8b1af8b1f4a562f10 (diff) |
cpuidle/ladder: add per cpu pm_qos_resume_latency considerationfor-test
Kernel or user may have special requirement on cpu response time, like
if a interrupt is pinned to a cpu, we don't want the cpu goes to deep
sleep. This patch can prevent this thing happen by consider per cpu
resume_latency setting in cpu sleep state selection in laddr governor.
Signed-off-by: Alex Shi <alex.shi@linaro.org>
-rw-r--r-- | drivers/cpuidle/governors/ladder.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/cpuidle/governors/ladder.c b/drivers/cpuidle/governors/ladder.c index 63bd5a403e22..d85bde88b434 100644 --- a/drivers/cpuidle/governors/ladder.c +++ b/drivers/cpuidle/governors/ladder.c @@ -18,6 +18,7 @@ #include <linux/module.h> #include <linux/jiffies.h> #include <linux/tick.h> +#include <linux/cpu.h> #include <asm/io.h> #include <asm/uaccess.h> @@ -69,8 +70,14 @@ static int ladder_select_state(struct cpuidle_driver *drv, { struct ladder_device *ldev = this_cpu_ptr(&ladder_devices); struct ladder_device_state *last_state; + struct device *device = get_cpu_device(dev->cpu); int last_residency, last_idx = ldev->last_state_idx; int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY); + int resume_latency = dev_pm_qos_read_value(device); + + /* resume_latency is 0 means no restriction */ + if (resume_latency && resume_latency < latency_req) + latency_req = resume_latency; /* Special case when user has set very strict latency requirement */ if (unlikely(latency_req == 0)) { |