cpufreq: interactive: Round up timer_rate to match jiffy

Timers are scheduled in unit of jiffies. Round up timer_rate so that
it matches the actual sampling period.

Change-Id: I88386a5a448e40333f9a9b9f0cf72af58cb54656
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>

diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c
index 49f206e48aa36d0d99811976ce4377cff342ac9d..6bbcc905bb3e71561cd6d22ea4fd61a7558e5871 100644 (file)
--- a/drivers/cpufreq/cpufreq_interactive.c
+++ b/drivers/cpufreq/cpufreq_interactive.c
@@ -855,12 +855,18 @@ static ssize_t store_timer_rate(struct cpufreq_interactive_tunables *tunables,
                const char *buf, size_t count)
 {
        int ret;
-       unsigned long val;
+       unsigned long val, val_round;
 
        ret = strict_strtoul(buf, 0, &val);
        if (ret < 0)
                return ret;
-       tunables->timer_rate = val;
+
+       val_round = jiffies_to_usecs(usecs_to_jiffies(val));
+       if (val != val_round)
+               pr_warn("timer_rate not aligned to jiffy. Rounded up to %lu\n",
+                       val_round);
+
+       tunables->timer_rate = val_round;
        return count;
 }