drm/mediatek: dp: Determine device of next_bridge

It's not necessary to have a next_bridge for DP device, so we add this
patch to judge this.

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220901044149.16782-8-rex-bc.chen@mediatek.com

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 136e13150281489fa5a4fc4ceb63f00ad47f086a..e37c9185e4eca69818902a04210389dbc199fe5c 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -1886,7 +1886,10 @@ static int mtk_dp_probe(struct platform_device *pdev)
                                     "failed to request dp irq resource\n");
 
        mtk_dp->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
-       if (IS_ERR(mtk_dp->next_bridge))
+       if (IS_ERR(mtk_dp->next_bridge) &&
+           PTR_ERR(mtk_dp->next_bridge) == -ENODEV)
+               mtk_dp->next_bridge = NULL;
+       else if (IS_ERR(mtk_dp->next_bridge))
                return dev_err_probe(dev, PTR_ERR(mtk_dp->next_bridge),
                                     "Failed to get bridge\n");