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Date:   Thu, 14 Feb 2019 15:48:21 -0500
From:   Sean Paul <sean@...rly.run>
To:     Jitao Shi <jitao.shi@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>, linux-pwm@...r.kernel.org,
        David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        drinkcat@...omium.org, Thierry Reding <treding@...dia.com>,
        Ajay Kumar <ajaykumar.rs@...sung.com>,
        Inki Dae <inki.dae@...sung.com>,
        Rahul Sharma <rahul.sharma@...sung.com>,
        Sean Paul <seanpaul@...omium.org>,
        Vincent Palatin <vpalatin@...omium.org>,
        Andy Yan <andy.yan@...k-chips.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <rmk+kernel@....linux.org.uk>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        Sascha Hauer <kernel@...gutronix.de>,
        yingjoe.chen@...iatek.com, eddie.huang@...iatek.com,
        cawa.cheng@...iatek.com, bibby.hsieh@...iatek.com,
        ck.hu@...iatek.com, stonea168@....com
Subject: Re: [PATCH 1/3] drm/mediatek: move mipi_dsi_host_register to probe

On Thu, Feb 14, 2019 at 12:42:41PM +0800, Jitao Shi wrote:
> DSI panel driver need attach function which is inculde in
> mipi_dsi_host_ops.

Which function is required from dsi_host?

Sean

> 
> If mipi_dsi_host_register is not in probe, dsi panel will
> probe fail or more delay.
> 
> So move the mipi_dsi_host_register to probe from bind.
> 
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 49 ++++++++++++++++++------------
>  1 file changed, 30 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 27b507eb4a99..93fa255b4aad 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -1045,12 +1045,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
>  		return ret;
>  	}
>  
> -	ret = mipi_dsi_host_register(&dsi->host);
> -	if (ret < 0) {
> -		dev_err(dev, "failed to register DSI host: %d\n", ret);
> -		goto err_ddp_comp_unregister;
> -	}
> -
>  	ret = mtk_dsi_create_conn_enc(drm, dsi);
>  	if (ret) {
>  		DRM_ERROR("Encoder create failed with %d\n", ret);
> @@ -1060,8 +1054,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
>  	return 0;
>  
>  err_unregister:
> -	mipi_dsi_host_unregister(&dsi->host);
> -err_ddp_comp_unregister:
>  	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
>  	return ret;
>  }
> @@ -1097,31 +1089,37 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  
>  	dsi->host.ops = &mtk_dsi_ops;
>  	dsi->host.dev = dev;
> +	dsi->dev = dev;
> +	ret = mipi_dsi_host_register(&dsi->host);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to register DSI host: %d\n", ret);
> +		return -EPROBE_DEFER;
> +	}
>  
>  	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
>  					  &dsi->panel, &dsi->bridge);
>  	if (ret)
> -		return ret;
> +		goto err_unregister_host;
>  
>  	dsi->engine_clk = devm_clk_get(dev, "engine");
>  	if (IS_ERR(dsi->engine_clk)) {
>  		ret = PTR_ERR(dsi->engine_clk);
>  		dev_err(dev, "Failed to get engine clock: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	dsi->digital_clk = devm_clk_get(dev, "digital");
>  	if (IS_ERR(dsi->digital_clk)) {
>  		ret = PTR_ERR(dsi->digital_clk);
>  		dev_err(dev, "Failed to get digital clock: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	dsi->hs_clk = devm_clk_get(dev, "hs");
>  	if (IS_ERR(dsi->hs_clk)) {
>  		ret = PTR_ERR(dsi->hs_clk);
>  		dev_err(dev, "Failed to get hs clock: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -1129,33 +1127,35 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  	if (IS_ERR(dsi->regs)) {
>  		ret = PTR_ERR(dsi->regs);
>  		dev_err(dev, "Failed to ioremap memory: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	dsi->phy = devm_phy_get(dev, "dphy");
>  	if (IS_ERR(dsi->phy)) {
>  		ret = PTR_ERR(dsi->phy);
>  		dev_err(dev, "Failed to get MIPI-DPHY: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
>  	if (comp_id < 0) {
>  		dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
> -		return comp_id;
> +		ret = comp_id;
> +		goto err_unregister_host;
>  	}
>  
>  	ret = mtk_ddp_comp_init(dev, dev->of_node, &dsi->ddp_comp, comp_id,
>  				&mtk_dsi_funcs);
>  	if (ret) {
>  		dev_err(dev, "Failed to initialize component: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	irq_num = platform_get_irq(pdev, 0);
>  	if (irq_num < 0) {
>  		dev_err(&pdev->dev, "failed to request dsi irq resource\n");
> -		return -EPROBE_DEFER;
> +		ret = -EPROBE_DEFER;
> +		goto err_unregister_host;
>  	}
>  
>  	irq_set_status_flags(irq_num, IRQ_TYPE_LEVEL_LOW);
> @@ -1163,14 +1163,25 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  			       IRQF_TRIGGER_LOW, dev_name(&pdev->dev), dsi);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to request mediatek dsi irq\n");
> -		return -EPROBE_DEFER;
> +		ret = -EPROBE_DEFER;
> +		goto err_unregister_host;
>  	}
>  
>  	init_waitqueue_head(&dsi->irq_wait_queue);
>  
>  	platform_set_drvdata(pdev, dsi);
>  
> -	return component_add(&pdev->dev, &mtk_dsi_component_ops);
> +	ret = component_add(&pdev->dev, &mtk_dsi_component_ops);
> +	if (ret) {
> +		ret = -EPROBE_DEFER;
> +		goto err_unregister_host;
> +	}
> +
> +	return 0;
> +
> +err_unregister_host:
> +	mipi_dsi_host_unregister(&dsi->host);
> +	return ret;
>  }
>  
>  static int mtk_dsi_remove(struct platform_device *pdev)
> -- 
> 2.20.1
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS

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