linux-kernel - Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

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Message-ID: <abfbff6c-14fb-b797-6abd-dcf02d495193@linaro.org>
Date:   Thu, 25 Nov 2021 18:23:12 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, robdclark@...il.com
Cc:     sean@...rly.run, airlied@...ux.ie, daniel@...ll.ch,
        maxime@...no.tech, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        jami.kettunen@...ainline.org
Subject: Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

On 25/11/2021 18:09, AngeloGioacchino Del Regno wrote:
> Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
> DSI host gets initialized earlier, but this caused unability to probe
> the entire stack of components because they all depend on interrupts
> coming from the main `mdss` node (mdp5, or dpu1).
> 
> To fix this issue, also anticipate probing mdp5 or dpu1 by initializing
> them at msm_pdev_probe() time: this will make sure that we add the
> required interrupt controller mapping before dsi and/or other components
> try to initialize, finally satisfying the dependency.
> 
> While at it, also change the allocation of msm_drm_private to use the
> devm variant of kzalloc().
> 
> Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/msm_drv.c | 81 ++++++++++++++++-------------------
>   1 file changed, 38 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 7936e8d498dd..790acf4993c0 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -512,45 +512,12 @@ static int msm_init_vram(struct drm_device *dev)
>   static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
>   {
>   	struct platform_device *pdev = to_platform_device(dev);
> -	struct drm_device *ddev;
> -	struct msm_drm_private *priv;
> -	struct msm_kms *kms;
> -	struct msm_mdss *mdss;
> +	struct drm_device *ddev = platform_get_drvdata(pdev);
> +	struct msm_drm_private *priv = ddev->dev_private;
> +	struct msm_kms *kms = priv->kms;
> +	struct msm_mdss *mdss = priv->mdss;
>   	int ret, i;
>   
> -	ddev = drm_dev_alloc(drv, dev);
> -	if (IS_ERR(ddev)) {
> -		DRM_DEV_ERROR(dev, "failed to allocate drm_device\n");
> -		return PTR_ERR(ddev);
> -	}
> -
> -	platform_set_drvdata(pdev, ddev);
> -
> -	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> -	if (!priv) {
> -		ret = -ENOMEM;
> -		goto err_put_drm_dev;
> -	}
> -
> -	ddev->dev_private = priv;
> -	priv->dev = ddev;
> -
> -	switch (get_mdp_ver(pdev)) {
> -	case KMS_MDP5:
> -		ret = mdp5_mdss_init(ddev);
> -		break;
> -	case KMS_DPU:
> -		ret = dpu_mdss_init(ddev);
> -		break;
> -	default:
> -		ret = 0;
> -		break;
> -	}
> -	if (ret)
> -		goto err_free_priv;
> -
> -	mdss = priv->mdss;
> -
>   	priv->wq = alloc_ordered_workqueue("msm", 0);
>   	priv->hangcheck_period = DRM_MSM_HANGCHECK_DEFAULT_PERIOD;
>   
> @@ -685,11 +652,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
>   err_destroy_mdss:
>   	if (mdss && mdss->funcs)
>   		mdss->funcs->destroy(ddev);
> -err_free_priv:
> -	kfree(priv);
> -err_put_drm_dev:
> -	drm_dev_put(ddev);
> -	platform_set_drvdata(pdev, NULL);
>   	return ret;
>   }
>   
> @@ -1382,12 +1344,42 @@ static const struct component_master_ops msm_drm_ops = {
>   static int msm_pdev_probe(struct platform_device *pdev)
>   {
>   	struct component_match *match = NULL;
> +	struct msm_drm_private *priv;
> +	struct drm_device *ddev;
>   	int ret;
>   
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	ddev = drm_dev_alloc(&msm_driver, &pdev->dev);
> +	if (IS_ERR(ddev)) {
> +		DRM_DEV_ERROR(&pdev->dev, "failed to allocate drm_device\n");
> +		return PTR_ERR(ddev);
> +	}
> +
> +	platform_set_drvdata(pdev, ddev);
> +	ddev->dev_private = priv;
> +	priv->dev = ddev;
> +
> +	switch (get_mdp_ver(pdev)) {
> +	case KMS_MDP5:
> +		ret = mdp5_mdss_init(ddev);
> +		break;
> +	case KMS_DPU:
> +		ret = dpu_mdss_init(ddev);
> +		break;
> +	default:
> +		ret = 0;
> +		break;
> +	}
> +	if (ret)
> +		goto err_put_drm_dev;
> +
>   	if (get_mdp_ver(pdev)) {
>   		ret = add_display_components(pdev, &match);
>   		if (ret)
> -			return ret;
> +			goto fail;
>   	}
>   
>   	ret = add_gpu_components(&pdev->dev, &match);
> @@ -1409,6 +1401,9 @@ static int msm_pdev_probe(struct platform_device *pdev)
>   
>   fail:
>   	of_platform_depopulate(&pdev->dev);
> +err_put_drm_dev:
> +	drm_dev_put(ddev);
> +	platform_set_drvdata(pdev, NULL);
>   	return ret;
>   }
>   
> 


-- 
With best wishes
Dmitry