linux-kernel - [PATCH v3 0/2] Support SSTC while PM operations

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Message-Id: <20241028033928.223218-1-nick.hu@sifive.com>
Date: Mon, 28 Oct 2024 11:39:24 +0800
From: Nick Hu <nick.hu@...ive.com>
To: greentime.hu@...ive.com,
	zong.li@...ive.com,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Pavel Machek <pavel@....cz>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Jones <ajones@...tanamicro.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	Nick Hu <nick.hu@...ive.com>,
	linux-pm@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/2] Support SSTC while PM operations

When the cpu is going to be hotplug, stop the stimecmp to prevent pending
interrupt.
When the cpu is going to be suspended, save the stimecmp before entering
the suspend state and restore it in the resume path.

changes in v3:
1. Update the commit description
2. Remove csr_read/write_hi_lo from the previous patch
Link: https://lore.kernel.org/lkml/20240926065422.226518-1-nick.hu@sifive.com/T/

changes in v2:
1. Add csr_read/write_hi_lo operations
2. Apply the suggestion from Anup.
Link: https://lore.kernel.org/lkml/20240829033904.477200-3-nick.hu@sifive.com/T/#u

Nick Hu (2):
  riscv: Add stimecmp save and restore
  clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug

 arch/riscv/include/asm/suspend.h  |  4 ++++
 arch/riscv/kernel/suspend.c       | 14 ++++++++++++++
 drivers/clocksource/timer-riscv.c |  6 ++++++
 3 files changed, 24 insertions(+)

-- 
2.34.1