This is a note to let you know that I've just added the patch titled drm/rockchip: vop2: disable planes when disabling the crtc to the 6.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-rockchip-vop2-disable-planes-when-disabling-the-.patch and it can be found in the queue-6.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit bef14d1439d9ec60ed579302f3c8f8158a90599f Author: Michael Tretter <m.tretter@xxxxxxxxxxxxxx> Date: Fri Oct 28 11:52:06 2022 +0200 drm/rockchip: vop2: disable planes when disabling the crtc [ Upstream commit 447fb14bf07905b880c9ed1ea92c53d6dd0649d7 ] The vop2 driver needs to explicitly disable the planes if the crtc is disabled. Unless the planes are explicitly disabled, the address of the last framebuffer is kept in the registers of the VOP2. When re-enabling the encoder after it has been disabled by the driver, the VOP2 will start and read the framebuffer that has been freed but is still pointed to by the register. The iommu will catch these read accesses and print errors. Explicitly disable the planes when the crtc is disabled to reset the registers. Signed-off-by: Michael Tretter <m.tretter@xxxxxxxxxxxxxx> Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20221028095206.2136601-3-m.tretter@xxxxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c index bf9c3e92e1cd..1fc04019dfd8 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c @@ -878,10 +878,14 @@ static void vop2_crtc_atomic_disable(struct drm_crtc *crtc, { struct vop2_video_port *vp = to_vop2_video_port(crtc); struct vop2 *vop2 = vp->vop2; + struct drm_crtc_state *old_crtc_state; int ret; vop2_lock(vop2); + old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc); + drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, false); + drm_crtc_vblank_off(crtc); /*