drm/rockchip: Allow driver to be shutdown on reboot/kexec

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.zyngier@arm.com
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 5864cb452c5c7710b6c38950f715125567217097..941f35233b1fe01ae1ae36061dd3747ce89f23d4 100644 (file)
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -448,6 +448,11 @@ static int rockchip_drm_platform_remove(struct platform_device *pdev)
        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 */ },
@@ -457,6 +462,7 @@ 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,