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->device_flags & MIPI_DSI_MODE_VIDEO) ?
 22		msm_dsi->encoders[MSM_DSI_VIDEO_ENCODER_ID] :
 23		msm_dsi->encoders[MSM_DSI_CMD_ENCODER_ID];
 24}
 25
 26static int dsi_get_phy(struct msm_dsi *msm_dsi)
 27{
 28	struct platform_device *pdev = msm_dsi->pdev;
 29	struct platform_device *phy_pdev;
 30	struct device_node *phy_node;
 31
 32	phy_node = of_parse_phandle(pdev->dev.of_node, "qcom,dsi-phy", 0);
 33	if (!phy_node) {
 34		dev_err(&pdev->dev, "cannot find phy device\n");
 35		return -ENXIO;
 36	}
 37
 38	phy_pdev = of_find_device_by_node(phy_node);
 39	if (phy_pdev)
 40		msm_dsi->phy = platform_get_drvdata(phy_pdev);
 41
 42	of_node_put(phy_node);
 43
 44	if (!phy_pdev || !msm_dsi->phy) {
 45		dev_err(&pdev->dev, "%s: phy driver is not ready\n", __func__);
 46		return -EPROBE_DEFER;
 47	}
 48
 49	msm_dsi->phy_dev = get_device(&phy_pdev->dev);
 50
 51	return 0;
 52}
 53
 54static void dsi_destroy(struct msm_dsi *msm_dsi)
 55{
 56	if (!msm_dsi)
 57		return;
 58
 59	msm_dsi_manager_unregister(msm_dsi);
 60
 61	if (msm_dsi->phy_dev) {
 62		put_device(msm_dsi->phy_dev);
 63		msm_dsi->phy = NULL;
 64		msm_dsi->phy_dev = NULL;
 65	}
 66
 67	if (msm_dsi->host) {
 68		msm_dsi_host_destroy(msm_dsi->host);
 69		msm_dsi->host = NULL;
 70	}
 71
 72	platform_set_drvdata(msm_dsi->pdev, NULL);
 73}
 74
 75static struct msm_dsi *dsi_init(struct platform_device *pdev)
 76{
 77	struct msm_dsi *msm_dsi;
 78	int ret;
 79
 80	if (!pdev)
 81		return ERR_PTR(-ENXIO);
 82
 83	msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
 84	if (!msm_dsi)
 85		return ERR_PTR(-ENOMEM);
 86	DBG("dsi probed=%p", msm_dsi);
 87
 88	msm_dsi->pdev = pdev;
 89	platform_set_drvdata(pdev, msm_dsi);
 90
 91	/* Init dsi host */
 92	ret = msm_dsi_host_init(msm_dsi);
 93	if (ret)
 94		goto destroy_dsi;
 95
 96	/* GET dsi PHY */
 97	ret = dsi_get_phy(msm_dsi);
 98	if (ret)
 99		goto destroy_dsi;
100
101	/* Register to dsi manager */
102	ret = msm_dsi_manager_register(msm_dsi);
103	if (ret)
104		goto destroy_dsi;
105
106	return msm_dsi;
107
108destroy_dsi:
109	dsi_destroy(msm_dsi);
110	return ERR_PTR(ret);
111}
112
113static int dsi_bind(struct device *dev, struct device *master, void *data)
114{
115	struct drm_device *drm = dev_get_drvdata(master);
116	struct msm_drm_private *priv = drm->dev_private;
117	struct platform_device *pdev = to_platform_device(dev);
118	struct msm_dsi *msm_dsi;
119
120	DBG("");
121	msm_dsi = dsi_init(pdev);
122	if (IS_ERR(msm_dsi))
123		return PTR_ERR(msm_dsi);
124
125	priv->dsi[msm_dsi->id] = msm_dsi;
126
127	return 0;
128}
129
130static void dsi_unbind(struct device *dev, struct device *master,
131		void *data)
132{
133	struct drm_device *drm = dev_get_drvdata(master);
134	struct msm_drm_private *priv = drm->dev_private;
135	struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
136	int id = msm_dsi->id;
137
138	if (priv->dsi[id]) {
139		dsi_destroy(msm_dsi);
140		priv->dsi[id] = NULL;
141	}
142}
143
144static const struct component_ops dsi_ops = {
145	.bind   = dsi_bind,
146	.unbind = dsi_unbind,
147};
148
149static int dsi_dev_probe(struct platform_device *pdev)
150{
151	return component_add(&pdev->dev, &dsi_ops);
152}
153
154static int dsi_dev_remove(struct platform_device *pdev)
155{
156	DBG("");
157	component_del(&pdev->dev, &dsi_ops);
158	return 0;
159}
160
161static const struct of_device_id dt_match[] = {
162	{ .compatible = "qcom,mdss-dsi-ctrl" },
163	{}
164};
165
166static struct platform_driver dsi_driver = {
167	.probe = dsi_dev_probe,
168	.remove = dsi_dev_remove,
169	.driver = {
170		.name = "msm_dsi",
171		.of_match_table = dt_match,
172	},
173};
174
175void __init msm_dsi_register(void)
176{
177	DBG("");
178	msm_dsi_phy_driver_register();
179	platform_driver_register(&dsi_driver);
180}
181
182void __exit msm_dsi_unregister(void)
183{
184	DBG("");
185	msm_dsi_phy_driver_unregister();
186	platform_driver_unregister(&dsi_driver);
187}
188
189int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
190		struct drm_encoder *encoders[MSM_DSI_ENCODER_NUM])
191{
192	struct msm_drm_private *priv = dev->dev_private;
193	struct drm_bridge *ext_bridge;
194	int ret, i;
195
196	if (WARN_ON(!encoders[MSM_DSI_VIDEO_ENCODER_ID] ||
197		!encoders[MSM_DSI_CMD_ENCODER_ID]))
198		return -EINVAL;
199
200	msm_dsi->dev = dev;
201
202	ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
203	if (ret) {
204		dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
205		goto fail;
206	}
207
208	msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
209	if (IS_ERR(msm_dsi->bridge)) {
210		ret = PTR_ERR(msm_dsi->bridge);
211		dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
212		msm_dsi->bridge = NULL;
213		goto fail;
214	}
215
216	for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
217		encoders[i]->bridge = msm_dsi->bridge;
218		msm_dsi->encoders[i] = encoders[i];
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	if (msm_dsi) {
250		/* bridge/connector are normally destroyed by drm: */
251		if (msm_dsi->bridge) {
252			msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
253			msm_dsi->bridge = NULL;
254		}
255
256		/* don't destroy connector if we didn't make it */
257		if (msm_dsi->connector && !msm_dsi->external_bridge)
258			msm_dsi->connector->funcs->destroy(msm_dsi->connector);
259
260		msm_dsi->connector = NULL;
261	}
262
263	return ret;
264}
265