linux-kernel - [PATCH v17 07/10] drm/mediatek: dp: Determine device of next

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Message-ID: <20220901044149.16782-8-rex-bc.chen@mediatek.com>
Date:   Thu, 1 Sep 2022 12:41:46 +0800
From:   Bo-Chen Chen <rex-bc.chen@...iatek.com>
To:     <chunkuang.hu@...nel.org>, <p.zabel@...gutronix.de>,
        <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <matthias.bgg@...il.com>, <deller@....de>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <angelogioacchino.delregno@...labora.com>, <ck.hu@...iatek.com>,
        <liangxu.xu@...iatek.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-fbdev@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Bo-Chen Chen <rex-bc.chen@...iatek.com>
Subject: [PATCH v17 07/10] 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@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 136e13150281..e37c9185e4ec 100644
--- 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");
 
-- 
2.18.0