drivers/gpu/drm/msm/dsi/dsi.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
 */

#include "dsi.h"

bool msm_dsi_is_cmd_mode(struct msm_dsi *msm_dsi)
{
	unsigned long host_flags = msm_dsi_host_get_mode_flags(msm_dsi->host);

	return !(host_flags & MIPI_DSI_MODE_VIDEO);
}

struct drm_dsc_config *msm_dsi_get_dsc_config(struct msm_dsi *msm_dsi)
{
	return msm_dsi_host_get_dsc_config(msm_dsi->host);
}

bool msm_dsi_wide_bus_enabled(struct msm_dsi *msm_dsi)
{
	return msm_dsi_host_is_wide_bus_enabled(msm_dsi->host);
}

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) {
		DRM_DEV_ERROR(&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);
		msm_dsi->phy_dev = &phy_pdev->dev;
	}

	of_node_put(phy_node);

	if (!phy_pdev) {
		DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
		return -EPROBE_DEFER;
	}
	if (!msm_dsi->phy) {
		put_device(&phy_pdev->dev);
		DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
		return -EPROBE_DEFER;
	}

	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 msm_drm_private *priv = dev_get_drvdata(master);
	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);

	/*
	 * Next bridge doesn't exist for the secondary DSI host in a bonded
	 * pair.
	 */
	if (!msm_dsi_is_bonded_dsi(msm_dsi) ||
	    msm_dsi_is_master_dsi(msm_dsi)) {
		struct drm_bridge *ext_bridge;

		ext_bridge = devm_drm_of_get_bridge(&msm_dsi->pdev->dev,
						    msm_dsi->pdev->dev.of_node, 1, 0);
		if (IS_ERR(ext_bridge))
			return PTR_ERR(ext_bridge);

		msm_dsi->next_bridge = ext_bridge;
	}

	priv->dsi[msm_dsi->id] = msm_dsi;

	return 0;
}

static void dsi_unbind(struct device *dev, struct device *master,
		void *data)
{
	struct msm_drm_private *priv = dev_get_drvdata(master);
	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);

	msm_dsi_tx_buf_free(msm_dsi->host);
	priv->dsi[msm_dsi->id] = NULL;
}

static const struct component_ops dsi_ops = {
	.bind   = dsi_bind,
	.unbind = dsi_unbind,
};

int dsi_dev_attach(struct platform_device *pdev)
{
	return component_add(&pdev->dev, &dsi_ops);
}

void dsi_dev_detach(struct platform_device *pdev)
{
	component_del(&pdev->dev, &dsi_ops);
}

static int dsi_dev_probe(struct platform_device *pdev)
{
	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);
	}

	return 0;
}

static void dsi_dev_remove(struct platform_device *pdev)
{
	struct msm_dsi *msm_dsi = platform_get_drvdata(pdev);

	DBG("");
	dsi_destroy(msm_dsi);
}

static const struct of_device_id dt_match[] = {
	{ .compatible = "qcom,mdss-dsi-ctrl" },

	/* Deprecated, don't use */
	{ .compatible = "qcom,dsi-ctrl-6g-qcm2290" },
	{}
};

static const struct dev_pm_ops dsi_pm_ops = {
	SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
				pm_runtime_force_resume)
};

static struct platform_driver dsi_driver = {
	.probe = dsi_dev_probe,
	.remove_new = 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)
{
	int ret;

	msm_dsi->dev = dev;

	ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
	if (ret) {
		DRM_DEV_ERROR(dev->dev, "failed to modeset init host: %d\n", ret);
		return ret;
	}

	if (msm_dsi_is_bonded_dsi(msm_dsi) &&
	    !msm_dsi_is_master_dsi(msm_dsi)) {
		/*
		 * Do not return an eror here,
		 * Just skip creating encoder/connector for the slave-DSI.
		 */
		return 0;
	}

	ret = msm_dsi_manager_connector_init(msm_dsi, encoder);
	if (ret) {
		DRM_DEV_ERROR(dev->dev,
			"failed to create dsi connector: %d\n", ret);
		return ret;
	}

	return 0;
}

void msm_dsi_snapshot(struct msm_disp_state *disp_state, struct msm_dsi *msm_dsi)
{
	msm_dsi_host_snapshot(disp_state, msm_dsi->host);
	msm_dsi_phy_snapshot(disp_state, msm_dsi->phy);
}