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

   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
  16 struct 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
  24 static 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                 msm_dsi->phy_dev = &phy_pdev->dev;
  40         }
  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         return 0;
  50 }
  51
  52 static 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
  73 static 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
 106 destroy_dsi:
 107         dsi_destroy(msm_dsi);
 108         return ERR_PTR(ret);
 109 }
 110
 111 static 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
 128 static 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
 142 static const struct component_ops dsi_ops = {
 143         .bind   = dsi_bind,
 144         .unbind = dsi_unbind,
 145 };
 146
 147 static int dsi_dev_probe(struct platform_device *pdev)
 148 {
 149         return component_add(&pdev->dev, &dsi_ops);
 150 }
 151
 152 static int dsi_dev_remove(struct platform_device *pdev)
 153 {
 154         DBG("");
 155         component_del(&pdev->dev, &dsi_ops);
 156         return 0;
 157 }
 158
 159 static const struct of_device_id dt_match[] = {
 160         { .compatible = "qcom,mdss-dsi-ctrl" },
 161         {}
 162 };
 163
 164 static const struct dev_pm_ops dsi_pm_ops = {
 165         SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
 166 };
 167
 168 static 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
 178 void __init msm_dsi_register(void)
 179 {
 180         DBG("");
 181         msm_dsi_phy_driver_register();
 182         platform_driver_register(&dsi_driver);
 183 }
 184
 185 void __exit msm_dsi_unregister(void)
 186 {
 187         DBG("");
 188         msm_dsi_phy_driver_unregister();
 189         platform_driver_unregister(&dsi_driver);
 190 }
 191
 192 int 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 = dev->dev_private;
 196         struct drm_bridge *ext_bridge;
 197         int ret;
 198
 199         if (WARN_ON(!encoder))
 200                 return -EINVAL;
 201
 202         msm_dsi->dev = dev;
 203
 204         ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 205         if (ret) {
 206                 dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
 207                 goto fail;
 208         }
 209
 210         msm_dsi->encoder = encoder;
 211
 212         msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 213         if (IS_ERR(msm_dsi->bridge)) {
 214                 ret = PTR_ERR(msm_dsi->bridge);
 215                 dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
 216                 msm_dsi->bridge = NULL;
 217                 goto fail;
 218         }
 219
 220         /*
 221          * check if the dsi encoder output is connected to a panel or an
 222          * external bridge. We create a connector only if we're connected to a
 223          * drm_panel device. When we're connected to an external bridge, we
 224          * assume that the drm_bridge driver will create the connector itself.
 225          */
 226         ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
 227
 228         if (ext_bridge)
 229                 msm_dsi->connector =
 230                         msm_dsi_manager_ext_bridge_init(msm_dsi->id);
 231         else
 232                 msm_dsi->connector =
 233                         msm_dsi_manager_connector_init(msm_dsi->id);
 234
 235         if (IS_ERR(msm_dsi->connector)) {
 236                 ret = PTR_ERR(msm_dsi->connector);
 237                 dev_err(dev->dev,
 238                         "failed to create dsi connector: %d\n", ret);
 239                 msm_dsi->connector = NULL;
 240                 goto fail;
 241         }
 242
 243         priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
 244         priv->connectors[priv->num_connectors++] = msm_dsi->connector;
 245
 246         return 0;
 247 fail:
 248         if (msm_dsi) {
 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
 262         return ret;
 263 }
 264