kernel/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->device_flags & MIPI_DSI_MODE_VIDEO) ?
  22                 msm_dsi->encoders[MSM_DSI_VIDEO_ENCODER_ID] :
  23                 msm_dsi->encoders[MSM_DSI_CMD_ENCODER_ID];
  24 }
  25
  26 static int dsi_get_phy(struct msm_dsi *msm_dsi)
  27 {
  28         struct platform_device *pdev = msm_dsi->pdev;
  29         struct platform_device *phy_pdev;
  30         struct device_node *phy_node;
  31
  32         phy_node = of_parse_phandle(pdev->dev.of_node, "qcom,dsi-phy", 0);
  33         if (!phy_node) {
  34                 dev_err(&pdev->dev, "cannot find phy device\n");
  35                 return -ENXIO;
  36         }
  37
  38         phy_pdev = of_find_device_by_node(phy_node);
  39         if (phy_pdev)
  40                 msm_dsi->phy = platform_get_drvdata(phy_pdev);
  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         msm_dsi->phy_dev = get_device(&phy_pdev->dev);
  50
  51         return 0;
  52 }
  53
  54 static void dsi_destroy(struct msm_dsi *msm_dsi)
  55 {
  56         if (!msm_dsi)
  57                 return;
  58
  59         msm_dsi_manager_unregister(msm_dsi);
  60
  61         if (msm_dsi->phy_dev) {
  62                 put_device(msm_dsi->phy_dev);
  63                 msm_dsi->phy = NULL;
  64                 msm_dsi->phy_dev = NULL;
  65         }
  66
  67         if (msm_dsi->host) {
  68                 msm_dsi_host_destroy(msm_dsi->host);
  69                 msm_dsi->host = NULL;
  70         }
  71
  72         platform_set_drvdata(msm_dsi->pdev, NULL);
  73 }
  74
  75 static struct msm_dsi *dsi_init(struct platform_device *pdev)
  76 {
  77         struct msm_dsi *msm_dsi;
  78         int ret;
  79
  80         if (!pdev)
  81                 return ERR_PTR(-ENXIO);
  82
  83         msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
  84         if (!msm_dsi)
  85                 return ERR_PTR(-ENOMEM);
  86         DBG("dsi probed=%p", msm_dsi);
  87
  88         msm_dsi->pdev = pdev;
  89         platform_set_drvdata(pdev, msm_dsi);
  90
  91         /* Init dsi host */
  92         ret = msm_dsi_host_init(msm_dsi);
  93         if (ret)
  94                 goto destroy_dsi;
  95
  96         /* GET dsi PHY */
  97         ret = dsi_get_phy(msm_dsi);
  98         if (ret)
  99                 goto destroy_dsi;
 100
 101         /* Register to dsi manager */
 102         ret = msm_dsi_manager_register(msm_dsi);
 103         if (ret)
 104                 goto destroy_dsi;
 105
 106         return msm_dsi;
 107
 108 destroy_dsi:
 109         dsi_destroy(msm_dsi);
 110         return ERR_PTR(ret);
 111 }
 112
 113 static int dsi_bind(struct device *dev, struct device *master, void *data)
 114 {
 115         struct drm_device *drm = dev_get_drvdata(master);
 116         struct msm_drm_private *priv = drm->dev_private;
 117         struct platform_device *pdev = to_platform_device(dev);
 118         struct msm_dsi *msm_dsi;
 119
 120         DBG("");
 121         msm_dsi = dsi_init(pdev);
 122         if (IS_ERR(msm_dsi))
 123                 return PTR_ERR(msm_dsi);
 124
 125         priv->dsi[msm_dsi->id] = msm_dsi;
 126
 127         return 0;
 128 }
 129
 130 static void dsi_unbind(struct device *dev, struct device *master,
 131                 void *data)
 132 {
 133         struct drm_device *drm = dev_get_drvdata(master);
 134         struct msm_drm_private *priv = drm->dev_private;
 135         struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 136         int id = msm_dsi->id;
 137
 138         if (priv->dsi[id]) {
 139                 dsi_destroy(msm_dsi);
 140                 priv->dsi[id] = NULL;
 141         }
 142 }
 143
 144 static const struct component_ops dsi_ops = {
 145         .bind   = dsi_bind,
 146         .unbind = dsi_unbind,
 147 };
 148
 149 static int dsi_dev_probe(struct platform_device *pdev)
 150 {
 151         return component_add(&pdev->dev, &dsi_ops);
 152 }
 153
 154 static int dsi_dev_remove(struct platform_device *pdev)
 155 {
 156         DBG("");
 157         component_del(&pdev->dev, &dsi_ops);
 158         return 0;
 159 }
 160
 161 static const struct of_device_id dt_match[] = {
 162         { .compatible = "qcom,mdss-dsi-ctrl" },
 163         {}
 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         },
 173 };
 174
 175 void __init msm_dsi_register(void)
 176 {
 177         DBG("");
 178         msm_dsi_phy_driver_register();
 179         platform_driver_register(&dsi_driver);
 180 }
 181
 182 void __exit msm_dsi_unregister(void)
 183 {
 184         DBG("");
 185         msm_dsi_phy_driver_unregister();
 186         platform_driver_unregister(&dsi_driver);
 187 }
 188
 189 int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 190                 struct drm_encoder *encoders[MSM_DSI_ENCODER_NUM])
 191 {
 192         struct msm_drm_private *priv = dev->dev_private;
 193         struct drm_bridge *ext_bridge;
 194         int ret, i;
 195
 196         if (WARN_ON(!encoders[MSM_DSI_VIDEO_ENCODER_ID] ||
 197                 !encoders[MSM_DSI_CMD_ENCODER_ID]))
 198                 return -EINVAL;
 199
 200         msm_dsi->dev = dev;
 201
 202         ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 203         if (ret) {
 204                 dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
 205                 goto fail;
 206         }
 207
 208         msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 209         if (IS_ERR(msm_dsi->bridge)) {
 210                 ret = PTR_ERR(msm_dsi->bridge);
 211                 dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
 212                 msm_dsi->bridge = NULL;
 213                 goto fail;
 214         }
 215
 216         for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
 217                 encoders[i]->bridge = msm_dsi->bridge;
 218                 msm_dsi->encoders[i] = encoders[i];
 219         }
 220
 221         /*
 222          * check if the dsi encoder output is connected to a panel or an
 223          * external bridge. We create a connector only if we're connected to a
 224          * drm_panel device. When we're connected to an external bridge, we
 225          * assume that the drm_bridge driver will create the connector itself.
 226          */
 227         ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
 228
 229         if (ext_bridge)
 230                 msm_dsi->connector =
 231                         msm_dsi_manager_ext_bridge_init(msm_dsi->id);
 232         else
 233                 msm_dsi->connector =
 234                         msm_dsi_manager_connector_init(msm_dsi->id);
 235
 236         if (IS_ERR(msm_dsi->connector)) {
 237                 ret = PTR_ERR(msm_dsi->connector);
 238                 dev_err(dev->dev,
 239                         "failed to create dsi connector: %d\n", ret);
 240                 msm_dsi->connector = NULL;
 241                 goto fail;
 242         }
 243
 244         priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
 245         priv->connectors[priv->num_connectors++] = msm_dsi->connector;
 246
 247         return 0;
 248 fail:
 249         if (msm_dsi) {
 250                 /* bridge/connector are normally destroyed by drm: */
 251                 if (msm_dsi->bridge) {
 252                         msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
 253                         msm_dsi->bridge = NULL;
 254                 }
 255
 256                 /* don't destroy connector if we didn't make it */
 257                 if (msm_dsi->connector && !msm_dsi->external_bridge)
 258                         msm_dsi->connector->funcs->destroy(msm_dsi->connector);
 259
 260                 msm_dsi->connector = NULL;
 261         }
 262
 263         return ret;
 264 }
 265