Commit d3fcacf5 authored by Abhilash Kesavan's avatar Abhilash Kesavan Committed by Kukjin Kim

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: default avatarAbhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 8baaa265
......@@ -91,8 +91,8 @@ static int exynos_cpu_suspend(unsigned long arg)
/* issue the standby signal into the pm unit. */
cpu_do_idle();
/* we should never get past here */
panic("sleep resumed to originator?");
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
static void exynos_pm_prepare(void)
......@@ -282,6 +282,8 @@ static void exynos_pm_resume(void)
if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
tmp |= S5P_CENTRAL_LOWPWR_CFG;
__raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
/* clear the wakeup state register */
__raw_writel(0x0, S5P_WAKEUP_STAT);
/* No need to perform below restore code */
goto early_wakeup;
}
......
......@@ -48,7 +48,8 @@ static int s3c2412_cpu_suspend(unsigned long arg)
s3c2412_sleep_enter();
panic("sleep resumed to originator?");
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
static void s3c2412_pm_prepare(void)
......
......@@ -34,7 +34,8 @@ static int s3c2416_cpu_suspend(unsigned long arg)
s3c2412_sleep_enter();
panic("sleep resumed to originator?");
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
static void s3c2416_pm_prepare(void)
......
......@@ -296,7 +296,8 @@ static int s3c64xx_cpu_suspend(unsigned long arg)
/* we should never get past here */
panic("sleep resumed to originator?");
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
/* mapping of interrupts to parts of the wakeup mask */
......
......@@ -103,8 +103,8 @@ static int s5p64x0_cpu_suspend(unsigned long arg)
"mcr p15, 0, %0, c7, c10, 4\n\t"
"mcr p15, 0, %0, c7, c0, 4" : : "r" (tmp));
/* we should never get past here */
panic("sleep resumed to originator?");
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
/* mapping of interrupts to parts of the wakeup mask */
......
......@@ -104,8 +104,8 @@ static int s5pv210_cpu_suspend(unsigned long arg)
"mcr p15, 0, %0, c7, c10, 4\n\t"
"wfi" : : "r" (tmp));
/* we should never get past here */
panic("sleep resumed to originator?");
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
static void s5pv210_pm_prepare(void)
......
......@@ -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 */
......
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