[PATCH] riscv: Enable ARCH_SUSPEND_POSSIBLE for s2idle

From: Song Shuai <songshuaishuai@tinylab.org>
To: paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu, conor@kernel.org, suagrfillet@gmail.com
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	Song Shuai <songshuaishuai@tinylab.org>
Subject: [PATCH] riscv: Enable ARCH_SUSPEND_POSSIBLE for s2idle
Date: Mon, 29 May 2023 18:15:24 +0800	[thread overview]
Message-ID: <20230529101524.322076-1-songshuaishuai@tinylab.org> (raw)

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>
---
 arch/riscv/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 348c0fa1fc8c..4bb818035585 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -805,6 +805,9 @@ 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"
-- 
2.20.1


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