Hi Kukjin,
On 25.06.2014 13:52, Tomasz Figa wrote:
> Due to recent consolidation of Exynos suspend and cpuidle code, some
> parts of suspend and resume sequences are executed two times, once from
> exynos_pm_syscore_ops and then from exynos_cpu_pm_notifier() and thus it
> breaks suspend, at least on Exynos4-based boards.
>
> This patch fixes the issue by removing exynos_pm_syscore_ops completely
> and making the code rely only on CPU PM notifier.
>
> Tested on Exynos4210-based Trats board.
>
> Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
> ---
> arch/arm/mach-exynos/pm.c | 23 ++++-------------------
> 1 file changed, 4 insertions(+), 19 deletions(-)
>
> Changes since v1:
> - rebased onto Kukjin's fixes branch.
>
> diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
> index 202ca73..f23cc77 100644
> --- a/arch/arm/mach-exynos/pm.c
> +++ b/arch/arm/mach-exynos/pm.c
> @@ -364,11 +364,6 @@ early_wakeup:
> return;
> }
>
> -static struct syscore_ops exynos_pm_syscore_ops = {
> - .suspend = exynos_pm_suspend,
> - .resume = exynos_pm_resume,
> -};
> -
> /*
> * Suspend Ops
> */
> @@ -438,22 +433,13 @@ static int exynos_cpu_pm_notifier(struct notifier_block *self,
>
> switch (cmd) {
> case CPU_PM_ENTER:
> - if (cpu == 0) {
> - exynos_pm_central_suspend();
> - if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9)
> - exynos_cpu_save_register();
> - }
> + if (cpu == 0)
> + exynos_pm_suspend();
> break;
>
> case CPU_PM_EXIT:
> - if (cpu == 0) {
> - if (read_cpuid_part_number() ==
> - ARM_CPU_PART_CORTEX_A9) {
> - scu_enable(S5P_VA_SCU);
> - exynos_cpu_restore_register();
> - }
> - exynos_pm_central_resume();
> - }
> + if (cpu == 0)
> + exynos_pm_resume();
> break;
> }
>
> @@ -478,6 +464,5 @@ void __init exynos_pm_init(void)
> tmp |= ((0xFF << 8) | (0x1F << 1));
> __raw_writel(tmp, S5P_WAKEUP_MASK);
>
> - register_syscore_ops(&exynos_pm_syscore_ops);
> suspend_set_ops(&exynos_suspend_ops);
> }
>
Please consider this patch for next fixes pull request. Without it
suspend/resume is broken for Exynos4 and probably other SoCs. This patch
just restores the sequence from before the patch moving things to PM
notifier, so I don't think it should need any special treatment.
Best regards,
Tomasz
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