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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Phong LE <ple@baylibre.com>,
        CK Hu <ck.hu@mediatek.com>
Subject: [PATCH 5.5 142/189] drm/mediatek: Handle component type MTK_DISP_OVL_2L correctly
Date:   Tue, 10 Mar 2020 13:39:39 +0100
Message-Id: <20200310123654.188930993@linuxfoundation.org>
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From: Phong LE <ple@baylibre.com>

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>

---
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c |    1 +
 1 file changed, 1 insertion(+)

--- 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
 	/* 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;