From: Andrew Jones <ajones@ventanamicro.com>
To: linux-riscv@lists.infradead.org
Cc: 'Anup Patel ' <apatel@ventanamicro.com>,
'Albert Ou ' <aou@eecs.berkeley.edu>,
'Paul Walmsley ' <paul.walmsley@sifive.com>,
'Sia Jee Heng ' <jeeheng.sia@starfivetech.com>,
'Palmer Dabbelt ' <palmer@dabbelt.com>,
'Ley Foon Tan ' <leyfoon.tan@starfivetech.com>
Subject: [RFC PATCH 0/1] riscv: Introduce system suspend support
Date: Fri, 6 Jan 2023 12:32:15 +0100 [thread overview]
Message-ID: <20230106113216.443057-1-ajones@ventanamicro.com> (raw)
Booting with an OpenSBI including the RFC series[1] implementing the
draft proposal for SBI system suspend[2] we can add system support to
Linux. This support implements "suspend-to-RAM", which means when a
kernel is built with CONFIG_SUSPEND 'echo mem > /sys/power/state' will
initiate a suspension.
This has only been tested on QEMU using the OpenSBI system suspend
test. The test just waits 5 seconds and then resumes. To truly use
system suspend a platform must have a low-level firmware implementation
and provide at least one wake-up event, such as from a wakeup-capable
RTC alarm, to resume.
[1] https://github.com/jones-drew/opensbi/commits/susp-rfc
Posting: http://lists.infradead.org/pipermail/opensbi/2023-January/004091.html
[2] https://github.com/jones-drew/riscv-sbi-doc/commit/d9e43e9a938fc3eb510e023c3f352462876f7785
Posting: https://lists.riscv.org/g/tech-prs/message/75
This patch is also available at
https://github.com/jones-drew/linux/commits/riscv/sbi-susp-rfc
Andrew Jones (1):
riscv: sbi: Introduce system suspend support
arch/riscv/Kconfig | 5 ++++-
arch/riscv/include/asm/sbi.h | 9 ++++++++
arch/riscv/kernel/suspend.c | 41 ++++++++++++++++++++++++++++++++++++
3 files changed, 54 insertions(+), 1 deletion(-)
--
2.39.0
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next reply other threads:[~2023-01-06 11:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-06 11:32 Andrew Jones [this message]
2023-01-06 11:32 ` [RFC PATCH 1/1] riscv: sbi: Introduce system suspend support Andrew Jones
2023-01-10 14:55 ` Leyfoon Tan
2023-01-10 15:52 ` Andrew Jones
2023-01-10 22:23 ` Conor Dooley
2023-01-11 8:52 ` Andrew Jones
2023-01-11 9:06 ` Conor Dooley
2023-01-11 9:16 ` Andrew Jones
2023-01-17 22:34 ` [RFC PATCH 0/1] riscv: " Conor Dooley
2023-01-18 11:55 ` Andrew Jones
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