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Vicente Bergas authored
As explained by Robin Murphy: > the IOMMU shutdown disables paging, so if the VOP is still > scanning out then that will result in whatever IOVAs it was using now going > straight out onto the bus as physical addresses. We had a more radical approach before in commit 7f3ef5de ("drm/rockchip: Allow driver to be shutdown on reboot/kexec") but that resulted in new warnings and oopses on shutdown on rk3399 chromeos devices. So second try is resurrecting Vicentes shutdown change which should achieve the same result but in a less drastic way. Fixes: 63238173 ("Revert "drm/rockchip: Allow driver to be shutdown on reboot/kexec"") Cc: Jeffy Chen <jeffy.chen@rock-chips.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Brian Norris <briannorris@chromium.org> Cc: Doug Anderson <dianders@chromium.org> Cc: stable@vger.kernel.org Suggested-by:
JeffyChen <jeffy.chen@rock-chips.com> Suggested-by:
Robin Murphy <robin.murphy@arm.com> Signed-off-by:
Vicente Bergas <vicencb@gmail.com> [adapted commit message to explain the history] Signed-off-by:
Heiko Stuebner <heiko@sntech.de> Tested-by:
Brian Norris <briannorris@chromium.org> Tested-by:
Douglas Anderson <dianders@chromium.org> Acked-by:
Marc Zyngier <marc.zyngier@arm.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190402113753.10118-1-heiko@sntech.de
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