linux-kernel - Re: [v1, 3/3] drm/mediatek: Move the getting bridge node function to mtk_dsi

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Message-ID: <092258211c47eca805c4dea6c4bf4ecc4c246cea.camel@mediatek.com>
Date:   Fri, 28 Jan 2022 13:03:55 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     <xinlei.lee@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <matthias.bgg@...il.com>
CC:     <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <jitao.shi@...iatek.com>
Subject: Re: [v1, 3/3] drm/mediatek: Move the getting bridge node function
 to mtk_dsi_bind

Hi, Xinlei:

On Thu, 2022-01-27 at 19:42 +0800, xinlei.lee@...iatek.com wrote:
> From: xinlei lee <xinlei.lee@...iatek.com>
> 
> The order of probe function for bridge drivers and dsi drivers is
> uncertain.
> To avoid the dsi probe cannot be executed, we place getting bridge
> node function in
> mtk_dsi_bind.

It seems this patch want to fix the same problem as [1]. Does [1] fix
your problem? If so, let's ignore this patch.

[1] 
https://patchwork.kernel.org/project/linux-mediatek/patch/20220127143623.123025-1-angelogioacchino.delregno@collabora.com/

Regards,
CK

> 
> Signed-off-by:Xinlei Lee <xinlei.lee@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 29 +++++++++++++++-------------
> -
>  1 file changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c
> b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 62af60d..a390f26 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -991,6 +991,21 @@ static int mtk_dsi_bind(struct device *dev,
> struct device *master, void *data)
>  	int ret;
>  	struct drm_device *drm = data;
>  	struct mtk_dsi *dsi = dev_get_drvdata(dev);
> +	struct drm_panel *panel;
> +
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> +					  &panel, &dsi->next_bridge);
> +	if (ret)
> +		return ret;
> +
> +	if (panel) {
> +		dsi->next_bridge = devm_drm_panel_bridge_add(dev,
> panel);
> +		if (IS_ERR(dsi->next_bridge)) {
> +			ret = PTR_ERR(dsi->next_bridge);
> +			dev_err(dev, "failed to add bridge: %d\n",
> ret);
> +			return ret;
> +		}
> +	}
>  
>  	ret = mtk_dsi_encoder_init(drm, dsi);
>  	if (ret)
> @@ -1016,7 +1031,6 @@ static int mtk_dsi_probe(struct platform_device
> *pdev)
>  {
>  	struct mtk_dsi *dsi;
>  	struct device *dev = &pdev->dev;
> -	struct drm_panel *panel;
>  	struct resource *regs;
>  	int irq_num;
>  	int ret;
> @@ -1033,19 +1047,6 @@ static int mtk_dsi_probe(struct
> platform_device *pdev)
>  		return ret;
>  	}
>  
> -	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> -					  &panel, &dsi->next_bridge);
> -	if (ret)
> -		goto err_unregister_host;
> -
> -	if (panel) {
> -		dsi->next_bridge = devm_drm_panel_bridge_add(dev,
> panel);
> -		if (IS_ERR(dsi->next_bridge)) {
> -			ret = PTR_ERR(dsi->next_bridge);
> -			goto err_unregister_host;
> -		}
> -	}
> -
>  	dsi->driver_data = of_device_get_match_data(dev);
>  
>  	dsi->engine_clk = devm_clk_get(dev, "engine");