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riscv: Enable ARCH_SUSPEND_POSSIBLE for s2idle

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With this configuration opened, the basic platform-independent s2idle is
provided by the sole "s2idle" string in `/sys/power/mem_sleep`.

At the end of s2idle, harts will hit the `wfi` instruction or enter the
SUSPENDED state through the sbi_cpuidle driver. The interrupt of possible
wakeup devices will be kept to wake the system up.

And platform-specific sleep states can be provided by future ACPI and
SBI SUSP extension support.

Signed-off-by: Song Shuai <songshuaishuai@tinylab.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20230529101524.322076-1-songshuaishuai@tinylab.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Song Shuai 2023-05-29 18:15:24 +08:00 committed by Palmer Dabbelt
parent 54cdede08f
commit c1f048a6bd
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arch/riscv/Kconfig
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@ -873,6 +873,9 @@ config ARCH_HIBERNATION_POSSIBLE
config ARCH_HIBERNATION_HEADER
def_bool HIBERNATION
config ARCH_SUSPEND_POSSIBLE
def_bool y
endmenu # "Power management options"
menu "CPU Power Management"