From: Vicente Bergas <vice...@gmail.com>
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
7f3ef5dedb14 ("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: 63238173b2fa ("Revert drm/rockchip: Allow driver to be shutdown on
reboot/kexec")
Cc: Jeffy Chen <jeffy.c...@rock-chips.com>
Cc: Robin Murphy <robin.mur...@arm.com>
Cc: Marc Zyngier <marc.zyng...@arm.com>
Cc: Brian Norris <briannor...@chromium.org>
Cc: Doug Anderson <diand...@chromium.org>
Cc: sta...@vger.kernel.org
Suggested-by: JeffyChen <jeffy.c...@rock-chips.com>
Suggested-by: Robin Murphy <robin.mur...@arm.com>
Signed-off-by: Vicente Bergas <vice...@gmail.com>
[adapted commit message to explain the history]
Signed-off-by: Heiko Stuebner <he...@sntech.de>
---
drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 8d7a634c12c2..cb938d3cd3c2 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -448,6 +448,14 @@ static int rockchip_drm_platform_remove(struct
platform_device *pdev)
return 0;
}
+static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
+{
+ struct drm_device *drm = platform_get_drvdata(pdev);
+
+ if (drm)
+ drm_atomic_helper_shutdown(drm);
+}
+
static const struct of_device_id rockchip_drm_dt_ids[] = {
{ .compatible = "rockchip,display-subsystem", },
{ /* sentinel */ },
@@ -457,6 +465,7 @@ MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
static struct platform_driver rockchip_drm_platform_driver = {
.probe = rockchip_drm_platform_probe,
.remove = rockchip_drm_platform_remove,
+ .shutdown = rockchip_drm_platform_shutdown,
.driver = {
.name = "rockchip-drm",
.of_match_table = rockchip_drm_dt_ids,
--
2.20.1
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