Re: [v2 1/5] drm/mediatek: move mipi_dsi_host_register to probe

[CK Hu]

Hi, Jitao:

On Tue, 2019-04-16 at 14:04 +0800, Jitao Shi wrote:
> DSI panel driver need attach function which is inculde in
> mipi_dsi_host_ops.
> 
> If mipi_dsi_host_register is not in probe, dsi panel will
> probe fail or more delay.

I think this patch just prevent delay, not to prevent dsi panel probe
fail. In [1], you mention mipi_dsi_attach() is called in
panel_simple_dsi_probe(), but panel_simple_dsi_probe() is trigger by
mipi_dsi_host_register(), so the probe would success.

[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/panel/panel-simple.c?h=v5.0-rc6#n2987


> 
> So move the mipi_dsi_host_register to probe from bind.
> 
> Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 50 ++++++++++++++++++------------
>  1 file changed, 30 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index b00eb2d2e086..6c4ac37f983d 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;

Why do this?

Regards,
CK

> +	ret = mipi_dsi_host_register(&dsi->host);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to register DSI host: %d\n", ret);
> +		return ret;
> +	}
>  
>  	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);