drm/mediatek: Handle component type MTK_DISP_OVL_2L correctly

commit 3d2ed431b8f39483477bc3c3a2aefbc9778ffe12 upstream.

The larb device remains NULL if the type is MTK_DISP_OVL_2L.
A kernel panic is raised when a crtc uses mtk_smi_larb_get or
mtk_smi_larb_put.

Fixes: b17bdd0d7a73 ("drm/mediatek: add component OVL_2L0")
Signed-off-by: Phong LE <ple@baylibre.com>
Signed-off-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 7f21307cda75b4d31b834efd261f0e734f86b10b..c26b2faa15cf1a9682dbb55d2128ba00bd285f48 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -358,6 +358,7 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
        /* Only DMA capable components need the LARB property */
        comp->larb_dev = NULL;
        if (type != MTK_DISP_OVL &&
+           type != MTK_DISP_OVL_2L &&
            type != MTK_DISP_RDMA &&
            type != MTK_DISP_WDMA)
                return 0;