1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
  4 */
  5
  6#include "dsi.h"
  7
  8struct drm_encoder *msm_dsi_get_encoder(struct msm_dsi *msm_dsi)
  9{
 10	if (!msm_dsi || !msm_dsi_device_connected(msm_dsi))
 11		return NULL;
 12
 13	return msm_dsi->encoder;
 14}
 15
 16static int dsi_get_phy(struct msm_dsi *msm_dsi)
 17{
 18	struct platform_device *pdev = msm_dsi->pdev;
 19	struct platform_device *phy_pdev;
 20	struct device_node *phy_node;
 21
 22	phy_node = of_parse_phandle(pdev->dev.of_node, "phys", 0);
 23	if (!phy_node) {
 24		DRM_DEV_ERROR(&pdev->dev, "cannot find phy device\n");
 25		return -ENXIO;
 26	}
 27
 28	phy_pdev = of_find_device_by_node(phy_node);
 29	if (phy_pdev) {
 30		msm_dsi->phy = platform_get_drvdata(phy_pdev);
 31		msm_dsi->phy_dev = &phy_pdev->dev;
 32	}
 33
 34	of_node_put(phy_node);
 35
 36	if (!phy_pdev || !msm_dsi->phy) {
 37		DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
 38		return -EPROBE_DEFER;
 39	}
 40
 41	return 0;
 42}
 43
 44static void dsi_destroy(struct msm_dsi *msm_dsi)
 45{
 46	if (!msm_dsi)
 47		return;
 48
 49	msm_dsi_manager_unregister(msm_dsi);
 50
 51	if (msm_dsi->phy_dev) {
 52		put_device(msm_dsi->phy_dev);
 53		msm_dsi->phy = NULL;
 54		msm_dsi->phy_dev = NULL;
 55	}
 56
 57	if (msm_dsi->host) {
 58		msm_dsi_host_destroy(msm_dsi->host);
 59		msm_dsi->host = NULL;
 60	}
 61
 62	platform_set_drvdata(msm_dsi->pdev, NULL);
 63}
 64
 65static struct msm_dsi *dsi_init(struct platform_device *pdev)
 66{
 67	struct msm_dsi *msm_dsi;
 68	int ret;
 69
 70	if (!pdev)
 71		return ERR_PTR(-ENXIO);
 72
 73	msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
 74	if (!msm_dsi)
 75		return ERR_PTR(-ENOMEM);
 76	DBG("dsi probed=%p", msm_dsi);
 77
 78	msm_dsi->id = -1;
 79	msm_dsi->pdev = pdev;
 80	platform_set_drvdata(pdev, msm_dsi);
 81
 82	/* Init dsi host */
 83	ret = msm_dsi_host_init(msm_dsi);
 84	if (ret)
 85		goto destroy_dsi;
 86
 87	/* GET dsi PHY */
 88	ret = dsi_get_phy(msm_dsi);
 89	if (ret)
 90		goto destroy_dsi;
 91
 92	/* Register to dsi manager */
 93	ret = msm_dsi_manager_register(msm_dsi);
 94	if (ret)
 95		goto destroy_dsi;
 96
 97	return msm_dsi;
 98
 99destroy_dsi:
100	dsi_destroy(msm_dsi);
101	return ERR_PTR(ret);
102}
103
104static int dsi_bind(struct device *dev, struct device *master, void *data)
105{
106	struct drm_device *drm = dev_get_drvdata(master);
107	struct msm_drm_private *priv = drm->dev_private;
108	struct platform_device *pdev = to_platform_device(dev);
109	struct msm_dsi *msm_dsi;
110
111	DBG("");
112	msm_dsi = dsi_init(pdev);
113	if (IS_ERR(msm_dsi)) {
114		/* Don't fail the bind if the dsi port is not connected */
115		if (PTR_ERR(msm_dsi) == -ENODEV)
116			return 0;
117		else
118			return PTR_ERR(msm_dsi);
119	}
120
121	priv->dsi[msm_dsi->id] = msm_dsi;
122
123	return 0;
124}
125
126static void dsi_unbind(struct device *dev, struct device *master,
127		void *data)
128{
129	struct drm_device *drm = dev_get_drvdata(master);
130	struct msm_drm_private *priv = drm->dev_private;
131	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
132	int id = msm_dsi->id;
133
134	if (priv->dsi[id]) {
135		dsi_destroy(msm_dsi);
136		priv->dsi[id] = NULL;
137	}
138}
139
140static const struct component_ops dsi_ops = {
141	.bind   = dsi_bind,
142	.unbind = dsi_unbind,
143};
144
145static int dsi_dev_probe(struct platform_device *pdev)
146{
147	return component_add(&pdev->dev, &dsi_ops);
148}
149
150static int dsi_dev_remove(struct platform_device *pdev)
151{
152	DBG("");
153	component_del(&pdev->dev, &dsi_ops);
154	return 0;
155}
156
157static const struct of_device_id dt_match[] = {
158	{ .compatible = "qcom,mdss-dsi-ctrl" },
159	{}
160};
161
162static const struct dev_pm_ops dsi_pm_ops = {
163	SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
164	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
165				pm_runtime_force_resume)
166};
167
168static struct platform_driver dsi_driver = {
169	.probe = dsi_dev_probe,
170	.remove = dsi_dev_remove,
171	.driver = {
172		.name = "msm_dsi",
173		.of_match_table = dt_match,
174		.pm = &dsi_pm_ops,
175	},
176};
177
178void __init msm_dsi_register(void)
179{
180	DBG("");
181	msm_dsi_phy_driver_register();
182	platform_driver_register(&dsi_driver);
183}
184
185void __exit msm_dsi_unregister(void)
186{
187	DBG("");
188	msm_dsi_phy_driver_unregister();
189	platform_driver_unregister(&dsi_driver);
190}
191
192int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
193			 struct drm_encoder *encoder)
194{
195	struct msm_drm_private *priv;
196	struct drm_bridge *ext_bridge;
197	int ret;
198
199	if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
200		return -EINVAL;
201
202	priv = dev->dev_private;
203	msm_dsi->dev = dev;
204
205	ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
206	if (ret) {
207		DRM_DEV_ERROR(dev->dev, "failed to modeset init host: %d\n", ret);
208		goto fail;
209	}
210
211	if (!msm_dsi_manager_validate_current_config(msm_dsi->id)) {
212		ret = -EINVAL;
213		goto fail;
214	}
215
216	msm_dsi->encoder = encoder;
217
218	msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
219	if (IS_ERR(msm_dsi->bridge)) {
220		ret = PTR_ERR(msm_dsi->bridge);
221		DRM_DEV_ERROR(dev->dev, "failed to create dsi bridge: %d\n", ret);
222		msm_dsi->bridge = NULL;
223		goto fail;
224	}
225
226	/*
227	 * check if the dsi encoder output is connected to a panel or an
228	 * external bridge. We create a connector only if we're connected to a
229	 * drm_panel device. When we're connected to an external bridge, we
230	 * assume that the drm_bridge driver will create the connector itself.
231	 */
232	ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
233
234	if (ext_bridge)
235		msm_dsi->connector =
236			msm_dsi_manager_ext_bridge_init(msm_dsi->id);
237	else
238		msm_dsi->connector =
239			msm_dsi_manager_connector_init(msm_dsi->id);
240
241	if (IS_ERR(msm_dsi->connector)) {
242		ret = PTR_ERR(msm_dsi->connector);
243		DRM_DEV_ERROR(dev->dev,
244			"failed to create dsi connector: %d\n", ret);
245		msm_dsi->connector = NULL;
246		goto fail;
247	}
248
249	msm_dsi_manager_setup_encoder(msm_dsi->id);
250
251	priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
252	priv->connectors[priv->num_connectors++] = msm_dsi->connector;
253
254	return 0;
255fail:
256	/* bridge/connector are normally destroyed by drm: */
257	if (msm_dsi->bridge) {
258		msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
259		msm_dsi->bridge = NULL;
260	}
261
262	/* don't destroy connector if we didn't make it */
263	if (msm_dsi->connector && !msm_dsi->external_bridge)
264		msm_dsi->connector->funcs->destroy(msm_dsi->connector);
265
266	msm_dsi->connector = NULL;
267
268	return ret;
269}
270
271void msm_dsi_snapshot(struct msm_disp_state *disp_state, struct msm_dsi *msm_dsi)
272{
273	msm_dsi_host_snapshot(disp_state, msm_dsi->host);
274	msm_dsi_phy_snapshot(disp_state, msm_dsi->phy);
275}
276