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Marc Zyngier 1aa55ca9b1 iommu/rockchip: Move irq request past pm_runtime_enable
Enabling the interrupt early, before power has been applied to the
device, can result in an interrupt being delivered too early if:

- the IOMMU shares an interrupt with a VOP
- the VOP has a pending interrupt (after a kexec, for example)

In these conditions, we end-up taking the interrupt without
the IOMMU being ready to handle the interrupt (not powered on).

Moving the interrupt request past the pm_runtime_enable() call
makes sure we can at least access the IOMMU registers. Note that
this is only a partial fix, and that the VOP interrupt will still
be screaming until the VOP driver kicks in, which advocates for
a more synchronized interrupt enabling/disabling approach.

Fixes: 0f181d3cf7 ("iommu/rockchip: Add runtime PM support")
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
2018-08-24 08:50:32 -07:00
arch arm64: rockchip: Force CONFIG_PM on Rockchip systems 2018-08-24 08:50:26 -07:00
block
certs
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Documentation arm64: dts: Fix various entry-method properties to reflect documentation 2018-08-24 08:50:02 -07:00
drivers iommu/rockchip: Move irq request past pm_runtime_enable 2018-08-24 08:50:32 -07:00
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