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Message-ID: <55eec0effd6cd08edbb130ec7f74ad993a75907d.camel@mediatek.com>
Subject: Re: [PATCH v17 07/10] drm/mediatek: dp: Determine device of
 next_bridge
From:   CK Hu <ck.hu@mediatek.com>
To:     Bo-Chen Chen <rex-bc.chen@mediatek.com>, <chunkuang.hu@kernel.org>,
        <p.zabel@pengutronix.de>, <daniel@ffwll.ch>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <mripard@kernel.org>,
        <tzimmermann@suse.de>, <matthias.bgg@gmail.com>, <deller@gmx.de>,
        <airlied@linux.ie>
CC:     <msp@baylibre.com>, <granquet@baylibre.com>,
        <jitao.shi@mediatek.com>, <wenst@chromium.org>,
        <angelogioacchino.delregno@collabora.com>,
        <liangxu.xu@mediatek.com>, <dri-devel@lists.freedesktop.org>,
        <linux-mediatek@lists.infradead.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-fbdev@vger.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@mediatek.com>
Date:   Fri, 2 Sep 2022 15:44:57 +0800
In-Reply-To: <20220901044149.16782-8-rex-bc.chen@mediatek.com>
References: <20220901044149.16782-1-rex-bc.chen@mediatek.com>
         <20220901044149.16782-8-rex-bc.chen@mediatek.com>
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Hi, Bo-Chen:

On Thu, 2022-09-01 at 12:41 +0800, Bo-Chen Chen wrote:
> It's not necessary to have a next_bridge for DP device, so we add
> this
> patch to judge this.

Reviewed-by: CK Hu <ck.hu@mediatek.com>

> 
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.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");
>