iommu/ipmmu-vmsa: Add suspend/resume support

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During PSCI system suspend, R-Car Gen3 SoCs are powered down, and all
IPMMU state is lost.  Hence after s2ram, devices wired behind an IPMMU,
and configured to use it, will see their DMA operations hang.

To fix this, restore all IPMMU contexts, and re-enable all active
micro-TLBs during system resume.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Geert Uytterhoeven 2019-05-27 13:52:53 +02:00 • committed by Joerg Roedel

parent 892db541cc

commit da38e9ec9c

1 changed files with 46 additions and 1 deletions

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drivers/iommu/ipmmu-vmsa.c

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