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 || !msm_dsi->phy) {
  44                 DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
  45                 return -EPROBE_DEFER;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static void dsi_destroy(struct msm_dsi *msm_dsi)
  52 {
  53         if (!msm_dsi)
  54                 return;
  55
  56         msm_dsi_manager_unregister(msm_dsi);
  57
  58         if (msm_dsi->phy_dev) {
  59                 put_device(msm_dsi->phy_dev);
  60                 msm_dsi->phy = NULL;
  61                 msm_dsi->phy_dev = NULL;
  62         }
  63
  64         if (msm_dsi->host) {
  65                 msm_dsi_host_destroy(msm_dsi->host);
  66                 msm_dsi->host = NULL;
  67         }
  68
  69         platform_set_drvdata(msm_dsi->pdev, NULL);
  70 }
  71
  72 static struct msm_dsi *dsi_init(struct platform_device *pdev)
  73 {
  74         struct msm_dsi *msm_dsi;
  75         int ret;
  76
  77         if (!pdev)
  78                 return ERR_PTR(-ENXIO);
  79
  80         msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
  81         if (!msm_dsi)
  82                 return ERR_PTR(-ENOMEM);
  83         DBG("dsi probed=%p", msm_dsi);
  84
  85         msm_dsi->id = -1;
  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 msm_dsi *msm_dsi = dev_get_drvdata(dev);
 116
 117         priv->dsi[msm_dsi->id] = msm_dsi;
 118
 119         return 0;
 120 }
 121
 122 static void dsi_unbind(struct device *dev, struct device *master,
 123                 void *data)
 124 {
 125         struct drm_device *drm = dev_get_drvdata(master);
 126         struct msm_drm_private *priv = drm->dev_private;
 127         struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 128
 129         priv->dsi[msm_dsi->id] = NULL;
 130 }
 131
 132 static const struct component_ops dsi_ops = {
 133         .bind   = dsi_bind,
 134         .unbind = dsi_unbind,
 135 };
 136
 137 int dsi_dev_attach(struct platform_device *pdev)
 138 {
 139         return component_add(&pdev->dev, &dsi_ops);
 140 }
 141
 142 void dsi_dev_detach(struct platform_device *pdev)
 143 {
 144         component_del(&pdev->dev, &dsi_ops);
 145 }
 146
 147 static int dsi_dev_probe(struct platform_device *pdev)
 148 {
 149         struct msm_dsi *msm_dsi;
 150
 151         DBG("");
 152         msm_dsi = dsi_init(pdev);
 153         if (IS_ERR(msm_dsi)) {
 154                 /* Don't fail the bind if the dsi port is not connected */
 155                 if (PTR_ERR(msm_dsi) == -ENODEV)
 156                         return 0;
 157                 else
 158                         return PTR_ERR(msm_dsi);
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int dsi_dev_remove(struct platform_device *pdev)
 165 {
 166         struct msm_dsi *msm_dsi = platform_get_drvdata(pdev);
 167
 168         DBG("");
 169         dsi_destroy(msm_dsi);
 170
 171         return 0;
 172 }
 173
 174 static const struct of_device_id dt_match[] = {
 175         { .compatible = "qcom,mdss-dsi-ctrl" },
 176         {}
 177 };
 178
 179 static const struct dev_pm_ops dsi_pm_ops = {
 180         SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
 181         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 182                                 pm_runtime_force_resume)
 183 };
 184
 185 static struct platform_driver dsi_driver = {
 186         .probe = dsi_dev_probe,
 187         .remove = dsi_dev_remove,
 188         .driver = {
 189                 .name = "msm_dsi",
 190                 .of_match_table = dt_match,
 191                 .pm = &dsi_pm_ops,
 192         },
 193 };
 194
 195 void __init msm_dsi_register(void)
 196 {
 197         DBG("");
 198         msm_dsi_phy_driver_register();
 199         platform_driver_register(&dsi_driver);
 200 }
 201
 202 void __exit msm_dsi_unregister(void)
 203 {
 204         DBG("");
 205         msm_dsi_phy_driver_unregister();
 206         platform_driver_unregister(&dsi_driver);
 207 }
 208
 209 int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 210                          struct drm_encoder *encoder)
 211 {
 212         struct msm_drm_private *priv;
 213         struct drm_bridge *ext_bridge;
 214         int ret;
 215
 216         if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
 217                 return -EINVAL;
 218
 219         priv = dev->dev_private;
 220         msm_dsi->dev = dev;
 221
 222         ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 223         if (ret) {
 224                 DRM_DEV_ERROR(dev->dev, "failed to modeset init host: %d\n", ret);
 225                 goto fail;
 226         }
 227
 228         if (!msm_dsi_manager_validate_current_config(msm_dsi->id)) {
 229                 ret = -EINVAL;
 230                 goto fail;
 231         }
 232
 233         msm_dsi->encoder = encoder;
 234
 235         msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 236         if (IS_ERR(msm_dsi->bridge)) {
 237                 ret = PTR_ERR(msm_dsi->bridge);
 238                 DRM_DEV_ERROR(dev->dev, "failed to create dsi bridge: %d\n", ret);
 239                 msm_dsi->bridge = NULL;
 240                 goto fail;
 241         }
 242
 243         /*
 244          * check if the dsi encoder output is connected to a panel or an
 245          * external bridge. We create a connector only if we're connected to a
 246          * drm_panel device. When we're connected to an external bridge, we
 247          * assume that the drm_bridge driver will create the connector itself.
 248          */
 249         ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
 250
 251         if (ext_bridge)
 252                 msm_dsi->connector =
 253                         msm_dsi_manager_ext_bridge_init(msm_dsi->id);
 254         else
 255                 msm_dsi->connector =
 256                         msm_dsi_manager_connector_init(msm_dsi->id);
 257
 258         if (IS_ERR(msm_dsi->connector)) {
 259                 ret = PTR_ERR(msm_dsi->connector);
 260                 DRM_DEV_ERROR(dev->dev,
 261                         "failed to create dsi connector: %d\n", ret);
 262                 msm_dsi->connector = NULL;
 263                 goto fail;
 264         }
 265
 266         priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
 267         priv->connectors[priv->num_connectors++] = msm_dsi->connector;
 268
 269         return 0;
 270 fail:
 271         /* bridge/connector are normally destroyed by drm: */
 272         if (msm_dsi->bridge) {
 273                 msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
 274                 msm_dsi->bridge = NULL;
 275         }
 276
 277         /* don't destroy connector if we didn't make it */
 278         if (msm_dsi->connector && !msm_dsi->external_bridge)
 279                 msm_dsi->connector->funcs->destroy(msm_dsi->connector);
 280
 281         msm_dsi->connector = NULL;
 282
 283         return ret;
 284 }
 285
 286 void msm_dsi_snapshot(struct msm_disp_state *disp_state, struct msm_dsi *msm_dsi)
 287 {
 288         msm_dsi_host_snapshot(disp_state, msm_dsi->host);
 289         msm_dsi_phy_snapshot(disp_state, msm_dsi->phy);
 290 }
 291