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

   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
   8 struct 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
  16 bool msm_dsi_is_cmd_mode(struct msm_dsi *msm_dsi)
  17 {
  18         unsigned long host_flags = msm_dsi_host_get_mode_flags(msm_dsi->host);
  19
  20         return !(host_flags & MIPI_DSI_MODE_VIDEO);
  21 }
  22
  23 static int dsi_get_phy(struct msm_dsi *msm_dsi)
  24 {
  25         struct platform_device *pdev = msm_dsi->pdev;
  26         struct platform_device *phy_pdev;
  27         struct device_node *phy_node;
  28
  29         phy_node = of_parse_phandle(pdev->dev.of_node, "phys", 0);
  30         if (!phy_node) {
  31                 DRM_DEV_ERROR(&pdev->dev, "cannot find phy device\n");
  32                 return -ENXIO;
  33         }
  34
  35         phy_pdev = of_find_device_by_node(phy_node);
  36         if (phy_pdev) {
  37                 msm_dsi->phy = platform_get_drvdata(phy_pdev);
  38                 msm_dsi->phy_dev = &phy_pdev->dev;
  39         }
  40
  41         of_node_put(phy_node);
  42
  43         if (!phy_pdev) {
  44                 DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
  45                 return -EPROBE_DEFER;
  46         }
  47         if (!msm_dsi->phy) {
  48                 put_device(&phy_pdev->dev);
  49                 DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
  50                 return -EPROBE_DEFER;
  51         }
  52
  53         return 0;
  54 }
  55
  56 static void dsi_destroy(struct msm_dsi *msm_dsi)
  57 {
  58         if (!msm_dsi)
  59                 return;
  60
  61         msm_dsi_manager_unregister(msm_dsi);
  62
  63         if (msm_dsi->phy_dev) {
  64                 put_device(msm_dsi->phy_dev);
  65                 msm_dsi->phy = NULL;
  66                 msm_dsi->phy_dev = NULL;
  67         }
  68
  69         if (msm_dsi->host) {
  70                 msm_dsi_host_destroy(msm_dsi->host);
  71                 msm_dsi->host = NULL;
  72         }
  73
  74         platform_set_drvdata(msm_dsi->pdev, NULL);
  75 }
  76
  77 static struct msm_dsi *dsi_init(struct platform_device *pdev)
  78 {
  79         struct msm_dsi *msm_dsi;
  80         int ret;
  81
  82         if (!pdev)
  83                 return ERR_PTR(-ENXIO);
  84
  85         msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
  86         if (!msm_dsi)
  87                 return ERR_PTR(-ENOMEM);
  88         DBG("dsi probed=%p", msm_dsi);
  89
  90         msm_dsi->id = -1;
  91         msm_dsi->pdev = pdev;
  92         platform_set_drvdata(pdev, msm_dsi);
  93
  94         /* Init dsi host */
  95         ret = msm_dsi_host_init(msm_dsi);
  96         if (ret)
  97                 goto destroy_dsi;
  98
  99         /* GET dsi PHY */
 100         ret = dsi_get_phy(msm_dsi);
 101         if (ret)
 102                 goto destroy_dsi;
 103
 104         /* Register to dsi manager */
 105         ret = msm_dsi_manager_register(msm_dsi);
 106         if (ret)
 107                 goto destroy_dsi;
 108
 109         return msm_dsi;
 110
 111 destroy_dsi:
 112         dsi_destroy(msm_dsi);
 113         return ERR_PTR(ret);
 114 }
 115
 116 static int dsi_bind(struct device *dev, struct device *master, void *data)
 117 {
 118         struct msm_drm_private *priv = dev_get_drvdata(master);
 119         struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 120
 121         priv->dsi[msm_dsi->id] = msm_dsi;
 122
 123         return 0;
 124 }
 125
 126 static void dsi_unbind(struct device *dev, struct device *master,
 127                 void *data)
 128 {
 129         struct msm_drm_private *priv = dev_get_drvdata(master);
 130         struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 131
 132         priv->dsi[msm_dsi->id] = NULL;
 133 }
 134
 135 static const struct component_ops dsi_ops = {
 136         .bind   = dsi_bind,
 137         .unbind = dsi_unbind,
 138 };
 139
 140 int dsi_dev_attach(struct platform_device *pdev)
 141 {
 142         return component_add(&pdev->dev, &dsi_ops);
 143 }
 144
 145 void dsi_dev_detach(struct platform_device *pdev)
 146 {
 147         component_del(&pdev->dev, &dsi_ops);
 148 }
 149
 150 static int dsi_dev_probe(struct platform_device *pdev)
 151 {
 152         struct msm_dsi *msm_dsi;
 153
 154         DBG("");
 155         msm_dsi = dsi_init(pdev);
 156         if (IS_ERR(msm_dsi)) {
 157                 /* Don't fail the bind if the dsi port is not connected */
 158                 if (PTR_ERR(msm_dsi) == -ENODEV)
 159                         return 0;
 160                 else
 161                         return PTR_ERR(msm_dsi);
 162         }
 163
 164         return 0;
 165 }
 166
 167 static int dsi_dev_remove(struct platform_device *pdev)
 168 {
 169         struct msm_dsi *msm_dsi = platform_get_drvdata(pdev);
 170
 171         DBG("");
 172         dsi_destroy(msm_dsi);
 173
 174         return 0;
 175 }
 176
 177 static const struct of_device_id dt_match[] = {
 178         { .compatible = "qcom,mdss-dsi-ctrl" },
 179         {}
 180 };
 181
 182 static const struct dev_pm_ops dsi_pm_ops = {
 183         SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
 184         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 185                                 pm_runtime_force_resume)
 186 };
 187
 188 static struct platform_driver dsi_driver = {
 189         .probe = dsi_dev_probe,
 190         .remove = dsi_dev_remove,
 191         .driver = {
 192                 .name = "msm_dsi",
 193                 .of_match_table = dt_match,
 194                 .pm = &dsi_pm_ops,
 195         },
 196 };
 197
 198 void __init msm_dsi_register(void)
 199 {
 200         DBG("");
 201         msm_dsi_phy_driver_register();
 202         platform_driver_register(&dsi_driver);
 203 }
 204
 205 void __exit msm_dsi_unregister(void)
 206 {
 207         DBG("");
 208         msm_dsi_phy_driver_unregister();
 209         platform_driver_unregister(&dsi_driver);
 210 }
 211
 212 int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 213                          struct drm_encoder *encoder)
 214 {
 215         struct msm_drm_private *priv;
 216         struct drm_bridge *ext_bridge;
 217         int ret;
 218
 219         if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
 220                 return -EINVAL;
 221
 222         priv = dev->dev_private;
 223         msm_dsi->dev = dev;
 224
 225         ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 226         if (ret) {
 227                 DRM_DEV_ERROR(dev->dev, "failed to modeset init host: %d\n", ret);
 228                 goto fail;
 229         }
 230
 231         if (msm_dsi_is_bonded_dsi(msm_dsi) &&
 232             !msm_dsi_is_master_dsi(msm_dsi)) {
 233                 /*
 234                  * Do not return an eror here,
 235                  * Just skip creating encoder/connector for the slave-DSI.
 236                  */
 237                 return 0;
 238         }
 239
 240         msm_dsi->encoder = encoder;
 241
 242         msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 243         if (IS_ERR(msm_dsi->bridge)) {
 244                 ret = PTR_ERR(msm_dsi->bridge);
 245                 DRM_DEV_ERROR(dev->dev, "failed to create dsi bridge: %d\n", ret);
 246                 msm_dsi->bridge = NULL;
 247                 goto fail;
 248         }
 249
 250         /*
 251          * check if the dsi encoder output is connected to a panel or an
 252          * external bridge. We create a connector only if we're connected to a
 253          * drm_panel device. When we're connected to an external bridge, we
 254          * assume that the drm_bridge driver will create the connector itself.
 255          */
 256         ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
 257
 258         if (ext_bridge)
 259                 msm_dsi->connector =
 260                         msm_dsi_manager_ext_bridge_init(msm_dsi->id);
 261         else
 262                 msm_dsi->connector =
 263                         msm_dsi_manager_connector_init(msm_dsi->id);
 264
 265         if (IS_ERR(msm_dsi->connector)) {
 266                 ret = PTR_ERR(msm_dsi->connector);
 267                 DRM_DEV_ERROR(dev->dev,
 268                         "failed to create dsi connector: %d\n", ret);
 269                 msm_dsi->connector = NULL;
 270                 goto fail;
 271         }
 272
 273         priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
 274         priv->connectors[priv->num_connectors++] = msm_dsi->connector;
 275
 276         return 0;
 277 fail:
 278         /* bridge/connector are normally destroyed by drm: */
 279         if (msm_dsi->bridge) {
 280                 msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
 281                 msm_dsi->bridge = NULL;
 282         }
 283
 284         /* don't destroy connector if we didn't make it */
 285         if (msm_dsi->connector && !msm_dsi->external_bridge)
 286                 msm_dsi->connector->funcs->destroy(msm_dsi->connector);
 287
 288         msm_dsi->connector = NULL;
 289
 290         return ret;
 291 }
 292
 293 void msm_dsi_snapshot(struct msm_disp_state *disp_state, struct msm_dsi *msm_dsi)
 294 {
 295         msm_dsi_host_snapshot(disp_state, msm_dsi->host);
 296         msm_dsi_phy_snapshot(disp_state, msm_dsi->phy);
 297 }
 298