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 static 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
  32         of_node_put(phy_node);
  33
  34         if (!phy_pdev || !msm_dsi->phy) {
  35                 DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
  36                 return -EPROBE_DEFER;
  37         }
  38
  39         msm_dsi->phy_dev = get_device(&phy_pdev->dev);
  40
  41         return 0;
  42 }
  43
  44 static 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
  65 static 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
  99 destroy_dsi:
 100         dsi_destroy(msm_dsi);
 101         return ERR_PTR(ret);
 102 }
 103
 104 static 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
 126 static 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
 140 static const struct component_ops dsi_ops = {
 141         .bind   = dsi_bind,
 142         .unbind = dsi_unbind,
 143 };
 144
 145 static int dsi_dev_probe(struct platform_device *pdev)
 146 {
 147         return component_add(&pdev->dev, &dsi_ops);
 148 }
 149
 150 static int dsi_dev_remove(struct platform_device *pdev)
 151 {
 152         DBG("");
 153         component_del(&pdev->dev, &dsi_ops);
 154         return 0;
 155 }
 156
 157 static const struct of_device_id dt_match[] = {
 158         { .compatible = "qcom,mdss-dsi-ctrl" },
 159         {}
 160 };
 161
 162 static const struct dev_pm_ops dsi_pm_ops = {
 163         SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
 164 };
 165
 166 static 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                 .pm = &dsi_pm_ops,
 173         },
 174 };
 175
 176 void __init msm_dsi_register(void)
 177 {
 178         DBG("");
 179         msm_dsi_phy_driver_register();
 180         platform_driver_register(&dsi_driver);
 181 }
 182
 183 void __exit msm_dsi_unregister(void)
 184 {
 185         DBG("");
 186         msm_dsi_phy_driver_unregister();
 187         platform_driver_unregister(&dsi_driver);
 188 }
 189
 190 int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 191                          struct drm_encoder *encoder)
 192 {
 193         struct msm_drm_private *priv;
 194         struct drm_bridge *ext_bridge;
 195         int ret;
 196
 197         if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
 198                 return -EINVAL;
 199
 200         priv = dev->dev_private;
 201         msm_dsi->dev = dev;
 202
 203         ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 204         if (ret) {
 205                 DRM_DEV_ERROR(dev->dev, "failed to modeset init host: %d\n", ret);
 206                 goto fail;
 207         }
 208
 209         if (!msm_dsi_manager_validate_current_config(msm_dsi->id))
 210                 goto fail;
 211
 212         msm_dsi->encoder = encoder;
 213
 214         msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 215         if (IS_ERR(msm_dsi->bridge)) {
 216                 ret = PTR_ERR(msm_dsi->bridge);
 217                 DRM_DEV_ERROR(dev->dev, "failed to create dsi bridge: %d\n", ret);
 218                 msm_dsi->bridge = NULL;
 219                 goto fail;
 220         }
 221
 222         /*
 223          * check if the dsi encoder output is connected to a panel or an
 224          * external bridge. We create a connector only if we're connected to a
 225          * drm_panel device. When we're connected to an external bridge, we
 226          * assume that the drm_bridge driver will create the connector itself.
 227          */
 228         ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
 229
 230         if (ext_bridge)
 231                 msm_dsi->connector =
 232                         msm_dsi_manager_ext_bridge_init(msm_dsi->id);
 233         else
 234                 msm_dsi->connector =
 235                         msm_dsi_manager_connector_init(msm_dsi->id);
 236
 237         if (IS_ERR(msm_dsi->connector)) {
 238                 ret = PTR_ERR(msm_dsi->connector);
 239                 DRM_DEV_ERROR(dev->dev,
 240                         "failed to create dsi connector: %d\n", ret);
 241                 msm_dsi->connector = NULL;
 242                 goto fail;
 243         }
 244
 245         msm_dsi_manager_setup_encoder(msm_dsi->id);
 246
 247         priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
 248         priv->connectors[priv->num_connectors++] = msm_dsi->connector;
 249
 250         return 0;
 251 fail:
 252         /* bridge/connector are normally destroyed by drm: */
 253         if (msm_dsi->bridge) {
 254                 msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
 255                 msm_dsi->bridge = NULL;
 256         }
 257
 258         /* don't destroy connector if we didn't make it */
 259         if (msm_dsi->connector && !msm_dsi->external_bridge)
 260                 msm_dsi->connector->funcs->destroy(msm_dsi->connector);
 261
 262         msm_dsi->connector = NULL;
 263
 264         return ret;
 265 }
 266