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authorAbhilash Kesavan <a.kesavan@samsung.com>2013-01-25 10:40:19 -0800
committerKukjin Kim <kgene.kim@samsung.com>2013-01-30 22:28:05 -0800
commitd3fcacf52d24ff1b12d994d9ddb7496f651294a2 (patch)
tree551b22ecd840f7ad76d0f057de2db1d1c8be1437 /arch/arm/plat-samsung/pm.c
parent8baaa265c5e8e378cb60164f47e24bf296a6d685 (diff)
downloadlinux-linaro-stable-d3fcacf52d24ff1b12d994d9ddb7496f651294a2.tar.gz
ARM: SAMSUNG: Gracefully exit on suspend failure
As per the Exynos5250 User Manual: When there are pending interrupt events, WFI/WFE instruction are ignored. To cancel the power-down sequence follow these steps: 1) Disable system power-down using CENTRAL_SEQ_CONFIGURATION register 2) Clear WAKEUP_STAT register 3) Enable interrupt service routine for CPU Code for early wakeup for exynos already exists. Remove the panic on suspend failure, clear the wakeup state register and return 1 from cpu_suspend to indicate a failed suspend (to a user daemon). Older Samsung SoCs have similar panics and I have removed them all. Haven't touched the S3C2410 sleep code. Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/plat-samsung/pm.c')
-rw-r--r--arch/arm/plat-samsung/pm.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/plat-samsung/pm.c b/arch/arm/plat-samsung/pm.c
index d896add68ad3..002b1472293b 100644
--- a/arch/arm/plat-samsung/pm.c
+++ b/arch/arm/plat-samsung/pm.c
@@ -243,6 +243,7 @@ int (*pm_cpu_sleep)(unsigned long);
static int s3c_pm_enter(suspend_state_t state)
{
+ int ret;
/* ensure the debug is initialised (if enabled) */
s3c_pm_debug_init();
@@ -300,7 +301,9 @@ static int s3c_pm_enter(suspend_state_t state)
* we resume as it saves its own register state and restores it
* during the resume. */
- cpu_suspend(0, pm_cpu_sleep);
+ ret = cpu_suspend(0, pm_cpu_sleep);
+ if (ret)
+ return ret;
/* restore the system state */