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authorAnson Huang <Anson.Huang@nxp.com>2016-08-29 17:41:12 +0200
committerShawn Guo <shawnguo@kernel.org>2016-08-29 16:39:28 +0200
commit547e8f526959ded88b93dbdbbb6c8549138fefa8 (patch)
tree9b272a64fc144c92bac86382e418b8518d0bbcdf /arch/arm/mach-imx
parentARM: imx: enable WAIT mode hardware workaround for imx6sx (diff)
downloadlinux-547e8f526959ded88b93dbdbbb6c8549138fefa8.tar.xz
linux-547e8f526959ded88b93dbdbbb6c8549138fefa8.zip
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')
-rw-r--r--arch/arm/mach-imx/cpuidle-imx6sx.c10
-rw-r--r--arch/arm/mach-imx/mach-imx6ul.c3
2 files changed, 13 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;
diff --git a/arch/arm/mach-imx/mach-imx6ul.c b/arch/arm/mach-imx/mach-imx6ul.c
index 5d9bfab279dd..08308a127ff7 100644
--- a/arch/arm/mach-imx/mach-imx6ul.c
+++ b/arch/arm/mach-imx/mach-imx6ul.c
@@ -16,6 +16,7 @@
#include <asm/mach/map.h>
#include "common.h"
+#include "cpuidle.h"
static void __init imx6ul_enet_clk_init(void)
{
@@ -79,6 +80,8 @@ static void __init imx6ul_init_irq(void)
static void __init imx6ul_init_late(void)
{
+ imx6sx_cpuidle_init();
+
if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ))
platform_device_register_simple("imx6q-cpufreq", -1, NULL, 0);
}