diff options
| author | Tomasz Figa <t.figa@samsung.com> | 2014-09-23 18:24:39 +0200 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2014-10-20 17:06:35 +0200 |
| commit | 2b9d9c321b5900c7ce82110a81cf3827ca9b33c6 (patch) | |
| tree | 6809b6da0bdbef8b2ddabf52c6dabc5ad6afdd9a /arch/arm/mach-exynos/pm.c | |
| parent | ARM: firmware: Introduce suspend and resume operations (diff) | |
| download | linux-2b9d9c321b5900c7ce82110a81cf3827ca9b33c6.tar.xz linux-2b9d9c321b5900c7ce82110a81cf3827ca9b33c6.zip | |
ARM: EXYNOS: Add support for firmware-assisted suspend/resume
On a numer of Exynos-based boards Linux kernel is running in non-secure
mode under a secure firmware. This means that certain operations need to
be handled in special way, with firmware assistance. System-wide
suspend/resume is an example of such operations.
This patch adds support for firmware-assisted suspend/resume by
leveraging recently introduced suspend and resume firmware operations
and modifying existing suspend/resume paths to account for presence of
secure firmware.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
[kgene.kim@samsung.com: rebased]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/mach-exynos/pm.c')
| -rw-r--r-- | arch/arm/mach-exynos/pm.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c index 16b23d156eec..047ac302835d 100644 --- a/arch/arm/mach-exynos/pm.c +++ b/arch/arm/mach-exynos/pm.c @@ -23,6 +23,7 @@ #include <linux/clk.h> #include <asm/cacheflush.h> +#include <asm/firmware.h> #include <asm/hardware/cache-l2x0.h> #include <asm/smp_scu.h> #include <asm/suspend.h> @@ -331,12 +332,11 @@ static void exynos_pm_release_retention(void) static void exynos_pm_resume(void) { + u32 cpuid = read_cpuid_part(); + if (exynos_pm_central_resume()) goto early_wakeup; - if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) - exynos_cpu_restore_register(); - /* For release retention */ exynos_pm_release_retention(); @@ -346,9 +346,13 @@ static void exynos_pm_resume(void) s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save)); - if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) + if (cpuid == ARM_CPU_PART_CORTEX_A9) scu_enable(S5P_VA_SCU); + if (call_firmware_op(resume) == -ENOSYS + && cpuid == ARM_CPU_PART_CORTEX_A9) + exynos_cpu_restore_register(); + early_wakeup: /* Clear SLEEP mode set in INFORM1 */ @@ -383,7 +387,9 @@ static int exynos_suspend_enter(suspend_state_t state) flush_cache_all(); s3c_pm_check_store(); - ret = cpu_suspend(0, pm_data->cpu_suspend); + ret = call_firmware_op(suspend); + if (ret == -ENOSYS) + ret = cpu_suspend(0, pm_data->cpu_suspend); if (ret) return ret; |