4.4-stable review patch. If anyone has any objections, please let me know.
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From: Marc Zyngier marc.zyngier@arm.com
commit 7f3ef5dedb146e3d5063b6845781ad1bb59b92b5 upstream.
Leaving the DRM driver enabled on reboot or kexec has the annoying effect of leaving the display generating transactions whilst the IOMMU has been shut down.
In turn, the IOMMU driver (which shares its interrupt line with the VOP) starts warning either on shutdown or when entering the secondary kernel in the kexec case (nothing is expected on that front).
A cheap way of ensuring that things are nicely shut down is to register a shutdown callback in the platform driver.
Signed-off-by: Marc Zyngier marc.zyngier@arm.com Tested-by: Vicente Bergas vicencb@gmail.com Signed-off-by: Heiko Stuebner heiko@sntech.de Link: https://patchwork.freedesktop.org/patch/msgid/20180805124807.18169-1-marc.zy... Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c @@ -547,6 +547,11 @@ static int rockchip_drm_platform_remove( return 0; }
+static void rockchip_drm_platform_shutdown(struct platform_device *pdev) +{ + rockchip_drm_platform_remove(pdev); +} + static const struct of_device_id rockchip_drm_dt_ids[] = { { .compatible = "rockchip,display-subsystem", }, { /* sentinel */ }, @@ -556,6 +561,7 @@ MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ 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,