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[v4,0/2] Support SSTC while PM operations

Message ID 20250219114135.27764-1-nick.hu@sifive.com (mailing list archive)
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Series Support SSTC while PM operations | expand

Message

Nick Hu Feb. 19, 2025, 11:41 a.m. UTC 
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 v4:
1. Apply the suggestion from Daniel to stop the clock before disabling
the irq.
Link: https://lore.kernel.org/lkml/5f7179ec-e4ce-4644-8a60-ce407a4d2f11@linaro.org/

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(+)