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 <[email protected]> Reviewed-by: Tomasz Figa <[email protected]> Acked-by: Amit Kucheria <[email protected]> Signed-off-by: Kukjin Kim <[email protected]>
makiko-fly · May 25, 2014 · 70ecb84 · 70ecb84
1 parent dcef663
commit 70ecb84
Show file tree

Hide file tree

Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/arch/arm/mach-exynos/cpuidle.c b/arch/arm/mach-exynos/cpuidle.c
@@ -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");

diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
@@ -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);
 }
-Original file line number
+Diff line change
@@ Expand Up / @@ -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);
     }
@@ Expand Down @@