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
  40         of_node_put(phy_node);
  41
  42         if (!phy_pdev || !msm_dsi->phy) {
  43                 dev_err(&pdev->dev, "%s: phy driver is not ready\n", __func__);
  44                 return -EPROBE_DEFER;
  45         }
  46
  47         msm_dsi->phy_dev = get_device(&phy_pdev->dev);
  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->id = -1;
  87         msm_dsi->pdev = pdev;
  88         platform_set_drvdata(pdev, msm_dsi);
  89
  90         /* Init dsi host */
  91         ret = msm_dsi_host_init(msm_dsi);
  92         if (ret)
  93                 goto destroy_dsi;
  94
  95         /* GET dsi PHY */
  96         ret = dsi_get_phy(msm_dsi);
  97         if (ret)
  98                 goto destroy_dsi;
  99
 100         /* Register to dsi manager */
 101         ret = msm_dsi_manager_register(msm_dsi);
 102         if (ret)
 103                 goto destroy_dsi;
 104
 105         return msm_dsi;
 106
 107 destroy_dsi:
 108         dsi_destroy(msm_dsi);
 109         return ERR_PTR(ret);
 110 }
 111
 112 static int dsi_bind(struct device *dev, struct device *master, void *data)
 113 {
 114         struct drm_device *drm = dev_get_drvdata(master);
 115         struct msm_drm_private *priv = drm->dev_private;
 116         struct platform_device *pdev = to_platform_device(dev);
 117         struct msm_dsi *msm_dsi;
 118
 119         DBG("");
 120         msm_dsi = dsi_init(pdev);
 121         if (IS_ERR(msm_dsi)) {
 122                 /* Don't fail the bind if the dsi port is not connected */
 123                 if (PTR_ERR(msm_dsi) == -ENODEV)
 124                         return 0;
 125                 else
 126                         return PTR_ERR(msm_dsi);
 127         }
 128
 129         priv->dsi[msm_dsi->id] = msm_dsi;
 130
 131         return 0;
 132 }
 133
 134 static void dsi_unbind(struct device *dev, struct device *master,
 135                 void *data)
 136 {
 137         struct drm_device *drm = dev_get_drvdata(master);
 138         struct msm_drm_private *priv = drm->dev_private;
 139         struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 140         int id = msm_dsi->id;
 141
 142         if (priv->dsi[id]) {
 143                 dsi_destroy(msm_dsi);
 144                 priv->dsi[id] = NULL;
 145         }
 146 }
 147
 148 static const struct component_ops dsi_ops = {
 149         .bind   = dsi_bind,
 150         .unbind = dsi_unbind,
 151 };
 152
 153 static int dsi_dev_probe(struct platform_device *pdev)
 154 {
 155         return component_add(&pdev->dev, &dsi_ops);
 156 }
 157
 158 static int dsi_dev_remove(struct platform_device *pdev)
 159 {
 160         DBG("");
 161         component_del(&pdev->dev, &dsi_ops);
 162         return 0;
 163 }
 164
 165 static const struct of_device_id dt_match[] = {
 166         { .compatible = "qcom,mdss-dsi-ctrl" },
 167         {}
 168 };
 169
 170 static const struct dev_pm_ops dsi_pm_ops = {
 171         SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, msm_dsi_runtime_resume, NULL)
 172 };
 173
 174 static struct platform_driver dsi_driver = {
 175         .probe = dsi_dev_probe,
 176         .remove = dsi_dev_remove,
 177         .driver = {
 178                 .name = "msm_dsi",
 179                 .of_match_table = dt_match,
 180                 .pm = &dsi_pm_ops,
 181         },
 182 };
 183
 184 void __init msm_dsi_register(void)
 185 {
 186         DBG("");
 187         msm_dsi_phy_driver_register();
 188         platform_driver_register(&dsi_driver);
 189 }
 190
 191 void __exit msm_dsi_unregister(void)
 192 {
 193         DBG("");
 194         msm_dsi_phy_driver_unregister();
 195         platform_driver_unregister(&dsi_driver);
 196 }
 197
 198 int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 199                          struct drm_encoder *encoder)
 200 {
 201         struct msm_drm_private *priv;
 202         struct drm_bridge *ext_bridge;
 203         int ret;
 204
 205         if (WARN_ON(!encoder) || WARN_ON(!msm_dsi) || WARN_ON(!dev))
 206                 return -EINVAL;
 207
 208         priv = dev->dev_private;
 209         msm_dsi->dev = dev;
 210
 211         ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 212         if (ret) {
 213                 dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
 214                 goto fail;
 215         }
 216
 217         if (!msm_dsi_manager_validate_current_config(msm_dsi->id))
 218                 goto fail;
 219
 220         msm_dsi->encoder = encoder;
 221
 222         msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 223         if (IS_ERR(msm_dsi->bridge)) {
 224                 ret = PTR_ERR(msm_dsi->bridge);
 225                 dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
 226                 msm_dsi->bridge = NULL;
 227                 goto fail;
 228         }
 229
 230         /*
 231          * check if the dsi encoder output is connected to a panel or an
 232          * external bridge. We create a connector only if we're connected to a
 233          * drm_panel device. When we're connected to an external bridge, we
 234          * assume that the drm_bridge driver will create the connector itself.
 235          */
 236         ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
 237
 238         if (ext_bridge)
 239                 msm_dsi->connector =
 240                         msm_dsi_manager_ext_bridge_init(msm_dsi->id);
 241         else
 242                 msm_dsi->connector =
 243                         msm_dsi_manager_connector_init(msm_dsi->id);
 244
 245         if (IS_ERR(msm_dsi->connector)) {
 246                 ret = PTR_ERR(msm_dsi->connector);
 247                 dev_err(dev->dev,
 248                         "failed to create dsi connector: %d\n", ret);
 249                 msm_dsi->connector = NULL;
 250                 goto fail;
 251         }
 252
 253         priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
 254         priv->connectors[priv->num_connectors++] = msm_dsi->connector;
 255
 256         return 0;
 257 fail:
 258         /* bridge/connector are normally destroyed by drm: */
 259         if (msm_dsi->bridge) {
 260                 msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
 261                 msm_dsi->bridge = NULL;
 262         }
 263
 264         /* don't destroy connector if we didn't make it */
 265         if (msm_dsi->connector && !msm_dsi->external_bridge)
 266                 msm_dsi->connector->funcs->destroy(msm_dsi->connector);
 267
 268         msm_dsi->connector = NULL;
 269
 270         return ret;
 271 }
 272