linux-kernel - Re: [PATCH v3 24/34] drm/tilcdc: Migrate to aggregate driver

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Date:   Mon, 01 Nov 2021 21:35:25 +0200
From:   Jyri Sarha <jyri.sarha@....fi>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Tomi Valkeinen <tomba@...nel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Saravana Kannan <saravanak@...gle.com>
Subject: Re: [PATCH v3 24/34] drm/tilcdc: Migrate to aggregate driver

On 2021-10-26 3:00, Stephen Boyd wrote:
> Use an aggregate driver instead of component ops so that we can get
> proper driver probe ordering of the aggregate device with respect to 
> all
> the component devices that make up the aggregate device.
> 
> Cc: Jyri Sarha <jyri.sarha@....fi>
> Cc: Tomi Valkeinen <tomba@...nel.org>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Rob Clark <robdclark@...il.com>
> Cc: Russell King <rmk+kernel@....linux.org.uk>
> Cc: Saravana Kannan <saravanak@...gle.com>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---

Tested-by: Jyri Sarha <jyri.sarha@....fi>

Thanks,
Jyri

>  drivers/gpu/drm/tilcdc/tilcdc_drv.c | 28 ++++++++++++++++------------
>  1 file changed, 16 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> index 6b03f89a98d4..d5c6567eec8d 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> @@ -531,13 +531,16 @@ static const struct dev_pm_ops tilcdc_pm_ops = {
>  /*
>   * Platform driver:
>   */
> -static int tilcdc_bind(struct device *dev)
> +static int tilcdc_bind(struct aggregate_device *adev)
>  {
> +	struct device *dev = adev->parent;
> +
>  	return tilcdc_init(&tilcdc_driver, dev);
>  }
> 
> -static void tilcdc_unbind(struct device *dev)
> +static void tilcdc_unbind(struct aggregate_device *adev)
>  {
> +	struct device *dev = adev->parent;
>  	struct drm_device *ddev = dev_get_drvdata(dev);
> 
>  	/* Check if a subcomponent has already triggered the unloading. */
> @@ -547,9 +550,13 @@ static void tilcdc_unbind(struct device *dev)
>  	tilcdc_fini(dev_get_drvdata(dev));
>  }
> 
> -static const struct component_master_ops tilcdc_comp_ops = {
> -	.bind = tilcdc_bind,
> -	.unbind = tilcdc_unbind,
> +static struct aggregate_driver tilcdc_aggregate_driver = {
> +	.probe = tilcdc_bind,
> +	.remove = tilcdc_unbind,
> +	.driver = {
> +		.name = "tilcdc_drm",
> +		.owner = THIS_MODULE,
> +	},
>  };
> 
>  static int tilcdc_pdev_probe(struct platform_device *pdev)
> @@ -566,12 +573,9 @@ static int tilcdc_pdev_probe(struct 
> platform_device *pdev)
>  	ret = tilcdc_get_external_components(&pdev->dev, &match);
>  	if (ret < 0)
>  		return ret;
> -	else if (ret == 0)
> +	if (ret == 0)
>  		return tilcdc_init(&tilcdc_driver, &pdev->dev);
> -	else
> -		return component_master_add_with_match(&pdev->dev,
> -						       &tilcdc_comp_ops,
> -						       match);
> +	return component_aggregate_register(&pdev->dev,
> &tilcdc_aggregate_driver, match);
>  }
> 
>  static int tilcdc_pdev_remove(struct platform_device *pdev)
> @@ -581,10 +585,10 @@ static int tilcdc_pdev_remove(struct
> platform_device *pdev)
>  	ret = tilcdc_get_external_components(&pdev->dev, NULL);
>  	if (ret < 0)
>  		return ret;
> -	else if (ret == 0)
> +	if (ret == 0)
>  		tilcdc_fini(platform_get_drvdata(pdev));
>  	else
> -		component_master_del(&pdev->dev, &tilcdc_comp_ops);
> +		component_aggregate_unregister(&pdev->dev, 
> &tilcdc_aggregate_driver);
> 
>  	return 0;
>  }