path: root/arch/x86/include
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authorMarc Zyngier <marc.zyngier@arm.com>2018-08-24 16:06:37 +0100
committerOlof Johansson <olof@lixom.net>2018-08-24 08:50:32 -0700
commit1aa55ca9b14af6cfd987ce4fdaf548f7067a5d07 (patch)
treebefb285272e15e7e782a146ad853667ba7c4fab4 /arch/x86/include
parent3fc7c5c0cff3150e471f5fd12f59971c6d2c6513 (diff)
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: 0f181d3cf7d98 ("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>
Diffstat (limited to 'arch/x86/include')
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