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ARM: EXYNOS: Disable cpuidle for exynos5440 

There is no point to register the cpuidle driver for the 5440 as it has only
one WFI state which is the default idle function when the cpuidle driver is
disabled.

By disabling cpuidle we prevent to enter to the governor computation for
nothing, thus saving a lot of processing time.

The only drawback is the statistic via sysfs on this state which is lost but
it is meaningless and it could be retrieved from the ftrace easily.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Daniel Lezcano 2014-05-09 06:52:59 +09:00 committed by Kukjin Kim
parent dcef663d49
commit 70ecb842ba
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/mach-exynos/cpuidle.c
View File

@ -134,9 +134,6 @@ static int exynos_cpuidle_probe(struct platform_device *pdev)
{
int ret;
if (soc_is_exynos5440())
exynos_idle_driver.state_count = 1;
ret = cpuidle_register(&exynos_idle_driver, NULL);
if (ret) {
dev_err(&pdev->dev, "failed to register cpuidle driver\n");

3
arch/arm/mach-exynos/exynos.c
View File

@ -177,6 +177,9 @@ static struct platform_device exynos_cpuidle = {
void __init exynos_cpuidle_init(void)
{
if (soc_is_exynos5440())
return;
platform_device_register(&exynos_cpuidle);
}