drm/imx: notify DRM core about CRTC vblank state

Make sure the DRM core is aware that there will be no vblank interrupts
incoming if the CRTC is disabled. That way the core will reject any
attempts from userspace to wait on a vblank event on a disabled CRTC.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index 30a57185bdb4e41e7ff26a0d4af36577a218b0ea..287226311413c7036cecb02e973e6109d0b26548 100644 (file)
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -64,6 +64,7 @@ static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
        /* Start DC channel and DI after IDMAC */
        ipu_dc_enable_channel(ipu_crtc->dc);
        ipu_di_enable(ipu_crtc->di);
+       drm_crtc_vblank_on(&ipu_crtc->base);
 
        ipu_crtc->enabled = 1;
 }
@@ -80,6 +81,7 @@ static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
        ipu_di_disable(ipu_crtc->di);
        ipu_plane_disable(ipu_crtc->plane[0]);
        ipu_dc_disable(ipu);
+       drm_crtc_vblank_off(&ipu_crtc->base);
 
        ipu_crtc->enabled = 0;
 }