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32 results

pgalloc.c

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  • dsi.c 6.12 KiB
    /*
     * Copyright (c) 2015, The Linux Foundation. All rights reserved.
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License version 2 and
     * only version 2 as published by the Free Software Foundation.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     */
    
    #include "dsi.h"
    
    struct drm_encoder *msm_dsi_get_encoder(struct msm_dsi *msm_dsi)
    {
    	if (!msm_dsi || !msm_dsi_device_connected(msm_dsi))
    		return NULL;
    
    	return msm_dsi->encoder;
    }
    
    static int dsi_get_phy(struct msm_dsi *msm_dsi)
    {
    	struct platform_device *pdev = msm_dsi->pdev;
    	struct platform_device *phy_pdev;
    	struct device_node *phy_node;
    
    	phy_node = of_parse_phandle(pdev->dev.of_node, "phys", 0);
    	if (!phy_node) {
    		dev_err(&pdev->dev, "cannot find phy device\n");
    		return -ENXIO;
    	}
    
    	phy_pdev = of_find_device_by_node(phy_node);
    	if (phy_pdev)
    		msm_dsi->phy = platform_get_drvdata(phy_pdev);
    
    	of_node_put(phy_node);
    
    	if (!phy_pdev || !msm_dsi->phy) {
    		dev_err(&pdev->dev, "%s: phy driver is not ready\n", __func__);
    		return -EPROBE_DEFER;
    	}
    
    	msm_dsi->phy_dev = get_device(&phy_pdev->dev);
    
    	return 0;
    }
    
    static void dsi_destroy(struct msm_dsi *msm_dsi)
    {
    	if (!msm_dsi)
    		return;
    
    	msm_dsi_manager_unregister(msm_dsi);
    
    	if (msm_dsi->phy_dev) {
    		put_device(msm_dsi->phy_dev);
    		msm_dsi->phy = NULL;
    		msm_dsi->phy_dev = NULL;
    	}
    
    	if (msm_dsi->host) {
    		msm_dsi_host_destroy(msm_dsi->host);
    		msm_dsi->host = NULL;
    	}
    
    	platform_set_drvdata(msm_dsi->pdev, NULL);
    }
    
    static struct msm_dsi *dsi_init(struct platform_device *pdev)
    {
    	struct msm_dsi *msm_dsi;
    	int ret;
    
    	if (!pdev)
    		return ERR_PTR(-ENXIO);
    
    	msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
    	if (!msm_dsi)
    		return ERR_PTR(-ENOMEM);
    	DBG("dsi probed=%p", msm_dsi);
    
    	msm_dsi->id = -1;
    	msm_dsi->pdev = pdev;
    	platform_set_drvdata(pdev, msm_dsi);
    
    	/* Init dsi host */
    	ret = msm_dsi_host_init(msm_dsi);
    	if (ret)
    		goto destroy_dsi;
    
    	/* GET dsi PHY */
    	ret = dsi_get_phy(msm_dsi);
    	if (ret)
    		goto destroy_dsi;
    
    	/* Register to dsi manager */
    	ret = msm_dsi_manager_register(msm_dsi);
    	if (ret)
    		goto destroy_dsi;
    
    	return msm_dsi;
    
    destroy_dsi:
    	dsi_destroy(msm_dsi);
    	return ERR_PTR(ret);
    }
    
    static int dsi_bind(struct device *dev, struct device *master, void *data)
    {
    	struct drm_device *drm = dev_get_drvdata(master);
    	struct msm_drm_private *priv = drm->dev_private;
    	struct platform_device *pdev = to_platform_device(dev);
    	struct msm_dsi *msm_dsi;
    
    	DBG("");
    	msm_dsi = dsi_init(pdev);
    	if (IS_ERR(msm_dsi)) {
    		/* Don't fail the bind if the dsi port is not connected */
    		if (PTR_ERR(msm_dsi) == -ENODEV)
    			return 0;
    		else
    			return PTR_ERR(msm_dsi);
    	}
    
    	priv->dsi[msm_dsi->id] = msm_dsi;
    
    	return 0;
    }
    
    static void dsi_unbind(struct device *dev, struct device *master,
    		void *data)
    {
    	struct drm_device *drm = dev_get_drvdata(master);
    	struct msm_drm_private *priv = drm->dev_private;
    	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
    	int id = msm_dsi->id;
    
    	if (priv->dsi[id]) {
    		dsi_destroy(msm_dsi);
    		priv->dsi[id] = NULL;
    	}
    }
    
    static const struct component_ops dsi_ops = {
    	.bind   = dsi_bind,
    	.unbind = dsi_unbind,
    };
    
    static int dsi_dev_probe(struct platform_device *pdev)
    {
    	return component_add(&pdev->dev, &dsi_ops);
    }
    
    static int dsi_dev_remove(struct platform_device *pdev)
    {
    	DBG("");
    	component_del(&pdev->dev, &dsi_ops);
    	return 0;
    }
    
    static const struct of_device_id dt_match[] = {
    	{ .compatible = "qcom,mdss-dsi-ctrl" },
    	{}
    };
    
    static const struct dev_pm_ops dsi_pm_ops = {
    	SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
    };
    
    static struct platform_driver dsi_driver = {
    	.probe = dsi_dev_probe,
    	.remove = dsi_dev_remove,
    	.driver = {
    		.name = "msm_dsi",
    		.of_match_table = dt_match,
    		.pm = &dsi_pm_ops,
    	},
    };
    
    void __init msm_dsi_register(void)
    {
    	DBG("");
    	msm_dsi_phy_driver_register();
    	platform_driver_register(&dsi_driver);
    }
    
    void __exit msm_dsi_unregister(void)
    {
    	DBG("");
    	msm_dsi_phy_driver_unregister();
    	platform_driver_unregister(&dsi_driver);
    }
    
    int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
    			 struct drm_encoder *encoder)
    {
    	struct msm_drm_private *priv;
    	struct drm_bridge *ext_bridge;
    	int ret;
    
    	if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
    		return -EINVAL;
    
    	priv = dev->dev_private;
    	msm_dsi->dev = dev;
    
    	ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
    	if (ret) {
    		dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
    		goto fail;
    	}
    
    	if (!msm_dsi_manager_validate_current_config(msm_dsi->id))
    		goto fail;
    
    	msm_dsi->encoder = encoder;
    
    	msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
    	if (IS_ERR(msm_dsi->bridge)) {
    		ret = PTR_ERR(msm_dsi->bridge);
    		dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
    		msm_dsi->bridge = NULL;
    		goto fail;
    	}
    
    	/*
    	 * check if the dsi encoder output is connected to a panel or an
    	 * external bridge. We create a connector only if we're connected to a
    	 * drm_panel device. When we're connected to an external bridge, we
    	 * assume that the drm_bridge driver will create the connector itself.
    	 */
    	ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
    
    	if (ext_bridge)
    		msm_dsi->connector =
    			msm_dsi_manager_ext_bridge_init(msm_dsi->id);
    	else
    		msm_dsi->connector =
    			msm_dsi_manager_connector_init(msm_dsi->id);
    
    	if (IS_ERR(msm_dsi->connector)) {
    		ret = PTR_ERR(msm_dsi->connector);
    		dev_err(dev->dev,
    			"failed to create dsi connector: %d\n", ret);
    		msm_dsi->connector = NULL;
    		goto fail;
    	}
    
    	priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
    	priv->connectors[priv->num_connectors++] = msm_dsi->connector;
    
    	return 0;
    fail:
    	/* bridge/connector are normally destroyed by drm: */
    	if (msm_dsi->bridge) {
    		msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
    		msm_dsi->bridge = NULL;
    	}
    
    	/* don't destroy connector if we didn't make it */
    	if (msm_dsi->connector && !msm_dsi->external_bridge)
    		msm_dsi->connector->funcs->destroy(msm_dsi->connector);
    
    	msm_dsi->connector = NULL;
    
    	return ret;
    }