diff options
author | Anson Huang <Anson.Huang@nxp.com> | 2016-08-29 18:41:12 +0300 |
---|---|---|
committer | Shawn Guo <shawnguo@kernel.org> | 2016-08-29 17:39:28 +0300 |
commit | 547e8f526959ded88b93dbdbbb6c8549138fefa8 (patch) | |
tree | 9b272a64fc144c92bac86382e418b8518d0bbcdf /arch/arm/mach-imx/cpuidle-imx6sx.c | |
parent | 6ae44aa651d0d82097cb5379be94e86beade9c7b (diff) | |
download | linux-547e8f526959ded88b93dbdbbb6c8549138fefa8.tar.xz |
ARM: imx: add cpuidle support for i.mx6ul
This patch enables cpuidle driver for i.MX6UL, it
reuses i.MX6SX's cpuidle driver, 3 levels of cpuidle
supported:
1. ARM WFI;
2. SOC in WAIT mode;
3. SOC in WAIT mode + ARM power off.
As i.MX6UL has cortex-A7 CORE with an internal L2
cache, so flushing it before powering down ARM platform
is necessary, flush_cache_all() in last step of cpu_suspend
has very small overhead, just call it to avoid cache
type check for different platforms.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'arch/arm/mach-imx/cpuidle-imx6sx.c')
-rw-r--r-- | arch/arm/mach-imx/cpuidle-imx6sx.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c index 261aaa45ff33..c5a5c3a70ab1 100644 --- a/arch/arm/mach-imx/cpuidle-imx6sx.c +++ b/arch/arm/mach-imx/cpuidle-imx6sx.c @@ -9,6 +9,7 @@ #include <linux/cpuidle.h> #include <linux/cpu_pm.h> #include <linux/module.h> +#include <asm/cacheflush.h> #include <asm/cpuidle.h> #include <asm/suspend.h> @@ -17,6 +18,15 @@ static int imx6sx_idle_finish(unsigned long val) { + /* + * for Cortex-A7 which has an internal L2 + * cache, need to flush it before powering + * down ARM platform, since flushing L1 cache + * here again has very small overhead, compared + * to adding conditional code for L2 cache type, + * just call flush_cache_all() is fine. + */ + flush_cache_all(); cpu_do_idle(); return 0; |