iommu/arm-smmu: Set rpm auto_suspend once during probe

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The current code calls arm_smmu_rpm_use_autosuspend() during device
attach, which seems unusual as it sets the autosuspend delay and the
'use_autosuspend' flag for the smmu device. These parameters can be
simply set once during the smmu probe and in order to avoid bouncing
rpm states, we can simply mark_last_busy() during a client dev attach
as discussed in [1].

Move the handling of arm_smmu_rpm_use_autosuspend() to the SMMU probe
and modify the arm_smmu_rpm_put() function to mark_last_busy() before
calling __pm_runtime_put_autosuspend(). Additionally,
s/pm_runtime_put_autosuspend/__pm_runtime_put_autosuspend/ to help with
the refactor of the pm_runtime_put_autosuspend() API [2].

Link: https://lore.kernel.org/r/20241023164835.GF29251@willie-the-truck [1]
Link: https://git.kernel.org/linus/b7d46644e554 [2]
Signed-off-by: Pranjal Shrivastava <praan@google.com>
Link: https://lore.kernel.org/r/20250123195636.4182099-1-praan@google.com
Signed-off-by: Will Deacon <will@kernel.org>

...

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Pranjal Shrivastava 2025-01-23 19:56:36 +00:00 • committed by Will Deacon

parent 0ad2507d5d

commit 0a679336dc

1 changed files with 6 additions and 4 deletions

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drivers/iommu/arm/arm-smmu/arm-smmu.c

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