1/*
  2 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
  3 *
  4 * This program is free software; you can redistribute it and/or modify
  5 * it under the terms of the GNU General Public License version 2 and
  6 * only version 2 as published by the Free Software Foundation.
  7 *
  8 * This program is distributed in the hope that it will be useful,
  9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11 * GNU General Public License for more details.
 12 */
 13
 14#include "dsi.h"
 15
 16struct drm_encoder *msm_dsi_get_encoder(struct msm_dsi *msm_dsi)
 17{
 18	if (!msm_dsi || !msm_dsi_device_connected(msm_dsi))
 19		return NULL;
 20
 21	return msm_dsi->encoder;
 22}
 23
 24static int dsi_get_phy(struct msm_dsi *msm_dsi)
 25{
 26	struct platform_device *pdev = msm_dsi->pdev;
 27	struct platform_device *phy_pdev;
 28	struct device_node *phy_node;
 29
 30	phy_node = of_parse_phandle(pdev->dev.of_node, "phys", 0);
 31	if (!phy_node) {
 32		dev_err(&pdev->dev, "cannot find phy device\n");
 33		return -ENXIO;
 34	}
 35
 36	phy_pdev = of_find_device_by_node(phy_node);
 37	if (phy_pdev)
 38		msm_dsi->phy = platform_get_drvdata(phy_pdev);
 39
 40	of_node_put(phy_node);
 41
 42	if (!phy_pdev || !msm_dsi->phy) {
 43		dev_err(&pdev->dev, "%s: phy driver is not ready\n", __func__);
 44		return -EPROBE_DEFER;
 45	}
 46
 47	msm_dsi->phy_dev = get_device(&phy_pdev->dev);
 48
 49	return 0;
 50}
 51
 52static void dsi_destroy(struct msm_dsi *msm_dsi)
 53{
 54	if (!msm_dsi)
 55		return;
 56
 57	msm_dsi_manager_unregister(msm_dsi);
 58
 59	if (msm_dsi->phy_dev) {
 60		put_device(msm_dsi->phy_dev);
 61		msm_dsi->phy = NULL;
 62		msm_dsi->phy_dev = NULL;
 63	}
 64
 65	if (msm_dsi->host) {
 66		msm_dsi_host_destroy(msm_dsi->host);
 67		msm_dsi->host = NULL;
 68	}
 69
 70	platform_set_drvdata(msm_dsi->pdev, NULL);
 71}
 72
 73static struct msm_dsi *dsi_init(struct platform_device *pdev)
 74{
 75	struct msm_dsi *msm_dsi;
 76	int ret;
 77
 78	if (!pdev)
 79		return ERR_PTR(-ENXIO);
 80
 81	msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
 82	if (!msm_dsi)
 83		return ERR_PTR(-ENOMEM);
 84	DBG("dsi probed=%p", msm_dsi);
 85
 86	msm_dsi->pdev = pdev;
 87	platform_set_drvdata(pdev, msm_dsi);
 88
 89	/* Init dsi host */
 90	ret = msm_dsi_host_init(msm_dsi);
 91	if (ret)
 92		goto destroy_dsi;
 93
 94	/* GET dsi PHY */
 95	ret = dsi_get_phy(msm_dsi);
 96	if (ret)
 97		goto destroy_dsi;
 98
 99	/* Register to dsi manager */
100	ret = msm_dsi_manager_register(msm_dsi);
101	if (ret)
102		goto destroy_dsi;
103
104	return msm_dsi;
105
106destroy_dsi:
107	dsi_destroy(msm_dsi);
108	return ERR_PTR(ret);
109}
110
111static int dsi_bind(struct device *dev, struct device *master, void *data)
112{
113	struct drm_device *drm = dev_get_drvdata(master);
114	struct msm_drm_private *priv = drm->dev_private;
115	struct platform_device *pdev = to_platform_device(dev);
116	struct msm_dsi *msm_dsi;
117
118	DBG("");
119	msm_dsi = dsi_init(pdev);
120	if (IS_ERR(msm_dsi))
121		return PTR_ERR(msm_dsi);
122
123	priv->dsi[msm_dsi->id] = msm_dsi;
124
125	return 0;
126}
127
128static void dsi_unbind(struct device *dev, struct device *master,
129		void *data)
130{
131	struct drm_device *drm = dev_get_drvdata(master);
132	struct msm_drm_private *priv = drm->dev_private;
133	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
134	int id = msm_dsi->id;
135
136	if (priv->dsi[id]) {
137		dsi_destroy(msm_dsi);
138		priv->dsi[id] = NULL;
139	}
140}
141
142static const struct component_ops dsi_ops = {
143	.bind   = dsi_bind,
144	.unbind = dsi_unbind,
145};
146
147static int dsi_dev_probe(struct platform_device *pdev)
148{
149	return component_add(&pdev->dev, &dsi_ops);
150}
151
152static int dsi_dev_remove(struct platform_device *pdev)
153{
154	DBG("");
155	component_del(&pdev->dev, &dsi_ops);
156	return 0;
157}
158
159static const struct of_device_id dt_match[] = {
160	{ .compatible = "qcom,mdss-dsi-ctrl" },
161	{}
162};
163
164static const struct dev_pm_ops dsi_pm_ops = {
165	SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
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		dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
208		goto fail;
209	}
210
211	msm_dsi->encoder = encoder;
212
213	msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
214	if (IS_ERR(msm_dsi->bridge)) {
215		ret = PTR_ERR(msm_dsi->bridge);
216		dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
217		msm_dsi->bridge = NULL;
218		goto fail;
219	}
220
221	/*
222	 * check if the dsi encoder output is connected to a panel or an
223	 * external bridge. We create a connector only if we're connected to a
224	 * drm_panel device. When we're connected to an external bridge, we
225	 * assume that the drm_bridge driver will create the connector itself.
226	 */
227	ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
228
229	if (ext_bridge)
230		msm_dsi->connector =
231			msm_dsi_manager_ext_bridge_init(msm_dsi->id);
232	else
233		msm_dsi->connector =
234			msm_dsi_manager_connector_init(msm_dsi->id);
235
236	if (IS_ERR(msm_dsi->connector)) {
237		ret = PTR_ERR(msm_dsi->connector);
238		dev_err(dev->dev,
239			"failed to create dsi connector: %d\n", ret);
240		msm_dsi->connector = NULL;
241		goto fail;
242	}
243
244	priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
245	priv->connectors[priv->num_connectors++] = msm_dsi->connector;
246
247	return 0;
248fail:
249	/* bridge/connector are normally destroyed by drm: */
250	if (msm_dsi->bridge) {
251		msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
252		msm_dsi->bridge = NULL;
253	}
254
255	/* don't destroy connector if we didn't make it */
256	if (msm_dsi->connector && !msm_dsi->external_bridge)
257		msm_dsi->connector->funcs->destroy(msm_dsi->connector);
258
259	msm_dsi->connector = NULL;
260
261	return ret;
262}
263