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Date:   Tue, 4 Apr 2017 11:08:26 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     airlied@...ux.ie, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 03/13] drm/meson: Add support for components

On 04/04/2017 10:59 AM, Daniel Vetter wrote:
> On Tue, Mar 21, 2017 at 04:25:40PM +0100, Neil Armstrong wrote:
>> This patch adds support for optional components connected through the
>> Device Tree endpoints scheme.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/gpu/drm/meson/meson_drv.c | 113 +++++++++++++++++++++++++++++++++-----
>>  1 file changed, 99 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
>> index bc562a0..a2e9f56 100644
>> --- a/drivers/gpu/drm/meson/meson_drv.c
>> +++ b/drivers/gpu/drm/meson/meson_drv.c
>> @@ -24,6 +24,7 @@
>>  #include <linux/module.h>
>>  #include <linux/mutex.h>
>>  #include <linux/platform_device.h>
>> +#include <linux/component.h>
>>  #include <linux/of_graph.h>
>>  
>>  #include <drm/drmP.h>
>> @@ -150,9 +151,9 @@ static bool meson_vpu_has_available_connectors(struct device *dev)
>>  	.max_register   = 0x1000,
>>  };
>>  
>> -static int meson_drv_probe(struct platform_device *pdev)
>> +static int meson_drv_bind(struct device *dev)
>>  {
>> -	struct device *dev = &pdev->dev;
>> +	struct platform_device *pdev = to_platform_device(dev);
>>  	struct meson_drm *priv;
>>  	struct drm_device *drm;
>>  	struct resource *res;
>> @@ -215,6 +216,15 @@ static int meson_drv_probe(struct platform_device *pdev)
>>  
>>  	drm_vblank_init(drm, 1);
>>  	drm_mode_config_init(drm);
>> +	drm->mode_config.max_width = 3840;
>> +	drm->mode_config.max_height = 2160;
>> +	drm->mode_config.funcs = &meson_mode_config_funcs;
>> +
>> +	/* Hardware Initialization */
>> +
>> +	meson_venc_init(priv);
>> +	meson_vpp_init(priv);
>> +	meson_viu_init(priv);
>>  
>>  	/* Encoder Initialization */
>>  
>> @@ -222,11 +232,11 @@ static int meson_drv_probe(struct platform_device *pdev)
>>  	if (ret)
>>  		goto free_drm;
>>  
>> -	/* Hardware Initialization */
>> -
>> -	meson_venc_init(priv);
>> -	meson_vpp_init(priv);
>> -	meson_viu_init(priv);
>> +	ret = component_bind_all(drm->dev, drm);
>> +	if (ret) {
>> +		dev_err(drm->dev, "Couldn't bind all components\n");
>> +		goto free_drm;
>> +	}
>>  
>>  	ret = meson_plane_create(priv);
>>  	if (ret)
>> @@ -241,9 +251,6 @@ static int meson_drv_probe(struct platform_device *pdev)
>>  		goto free_drm;
>>  
>>  	drm_mode_config_reset(drm);
>> -	drm->mode_config.max_width = 8192;
>> -	drm->mode_config.max_height = 8192;
>> -	drm->mode_config.funcs = &meson_mode_config_funcs;
>>  
>>  	priv->fbdev = drm_fbdev_cma_init(drm, 32,
>>  					 drm->mode_config.num_connector);
>> @@ -268,9 +275,9 @@ static int meson_drv_probe(struct platform_device *pdev)
>>  	return ret;
>>  }
>>  
>> -static int meson_drv_remove(struct platform_device *pdev)
>> +static void meson_drv_unbind(struct device *dev)
>>  {
>> -	struct drm_device *drm = dev_get_drvdata(&pdev->dev);
>> +	struct drm_device *drm = dev_get_drvdata(dev);
>>  	struct meson_drm *priv = drm->dev_private;
>>  
>>  	drm_dev_unregister(drm);
>> @@ -280,9 +287,88 @@ static int meson_drv_remove(struct platform_device *pdev)
>>  	drm_vblank_cleanup(drm);
>>  	drm_dev_unref(drm);
>>  
>> -	return 0;
>>  }
>>  
>> +static const struct component_master_ops meson_drv_master_ops = {
>> +	.bind	= meson_drv_bind,
>> +	.unbind	= meson_drv_unbind,
>> +};
>> +
>> +static int compare_of(struct device *dev, void *data)
>> +{
>> +	DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
>> +			 of_node_full_name(dev->of_node),
>> +			 of_node_full_name(data));
>> +
>> +	return dev->of_node == data;
>> +}
>> +
>> +/* Possible connectors nodes to ignore */
>> +static const struct of_device_id connectors_match[] = {
>> +	{ .compatible = "composite-video-connector" },
>> +	{ .compatible = "svideo-connector" },
>> +	{ .compatible = "hdmi-connector" },
>> +	{ .compatible = "dvi-connector" },
>> +	{}
>> +};
>> +
>> +static int meson_probe_remote(struct platform_device *pdev,
>> +			      struct component_match **match,
>> +			      struct device_node *parent,
>> +			      struct device_node *remote)
>> +{
>> +	struct device_node *ep, *remote_node;
>> +	int count = 1;
>> +
>> +	/* If node is a connector, return and do not add to match table */
>> +	if (of_match_node(connectors_match, remote))
>> +		return 1;
>> +
>> +	component_match_add(&pdev->dev, match, compare_of, remote);
>> +
>> +	for_each_endpoint_of_node(remote, ep) {
>> +		remote_node = of_graph_get_remote_port_parent(ep);
>> +		if (!remote_node ||
>> +		    remote_node == parent || /* Ignore parent endpoint */
>> +		    !of_device_is_available(remote_node))
>> +			continue;
>> +
>> +		count += meson_probe_remote(pdev, match, remote, remote_node);
>> +
>> +		of_node_put(remote_node);
>> +	}
>> +
>> +	return count;
>> +}
>> +
>> +static int meson_drv_probe(struct platform_device *pdev)
>> +{
>> +	struct component_match *match = NULL;
>> +	struct device_node *np = pdev->dev.of_node;
>> +	struct device_node *ep, *remote;
>> +	int count = 0;
>> +
>> +	for_each_endpoint_of_node(np, ep) {
>> +		remote = of_graph_get_remote_port_parent(ep);
>> +		if (!remote || !of_device_is_available(remote))
>> +			continue;
>> +
>> +		count += meson_probe_remote(pdev, &match, np, remote);
>> +	}
>> +
>> +	/* If some endpoints were found, initialize the nodes */
>> +	if (count) {
> 
> What if you have more than 1 endpoint described, but module load order
> conspires against you to only initialize 1 at first?

As I understood, the component_bind_all() will fail until all modules are loaded
even in wrong order, no ?
I tested with multiple combinations and it worked like a charm... maybe I missed
something here !

Thanks,
Neil

> -Daniel
> 
>> +		dev_info(&pdev->dev, "Queued %d outputs on vpu\n", count);
>> +
>> +		return component_master_add_with_match(&pdev->dev,
>> +						       &meson_drv_master_ops,
>> +						       match);
>> +	}
>> +
>> +	/* If no output endpoints were available, simply bail out */
>> +	return 0;
>> +};
>> +
>>  static const struct of_device_id dt_match[] = {
>>  	{ .compatible = "amlogic,meson-gxbb-vpu" },
>>  	{ .compatible = "amlogic,meson-gxl-vpu" },
>> @@ -293,7 +379,6 @@ static int meson_drv_remove(struct platform_device *pdev)
>>  
>>  static struct platform_driver meson_drm_platform_driver = {
>>  	.probe      = meson_drv_probe,
>> -	.remove     = meson_drv_remove,
>>  	.driver     = {
>>  		.name	= "meson-drm",
>>  		.of_match_table = dt_match,
>> -- 
>> 1.9.1
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

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