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cpufreq: interactive governor drops bits in time calculation

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Keep time calculation in 64-bit throughout. If we have long times
between idle calculations this can result in deltas > 32 bits
which causes incorrect load percentage calculations and selecting
the wrong frequencies if we truncate here.

Change-Id: Ia9e0b8f14a1472001a922f7accb53e6a0da4d0a0
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
(cherry picked from commit 6696986a93)
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
This commit is contained in:
Chris Redpath
2013-06-17 18:36:56 +01:00
parent b224647f87
commit 682c1e3646
1 changed files with 3 additions and 4 deletions
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7
drivers/cpufreq/cpufreq_interactive.c
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@@ -337,12 +337,11 @@ static unsigned int choose_freq(struct interactive_cpu *icpu,
static u64 update_load(struct interactive_cpu *icpu, int cpu)
{
struct interactive_tunables *tunables = icpu->ipolicy->tunables;
unsigned int delta_idle, delta_time;
u64 now_idle, now, active_time;
u64 now_idle, now, active_time, delta_idle, delta_time;
now_idle = get_cpu_idle_time(cpu, &now, tunables->io_is_busy);
delta_idle = (unsigned int)(now_idle - icpu->time_in_idle);
delta_time = (unsigned int)(now - icpu->time_in_idle_timestamp);
delta_idle = (now_idle - icpu->time_in_idle);
delta_time = (now - icpu->time_in_idle_timestamp);
if (delta_time <= delta_idle)
active_time = 0;