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->panel)
  19                 return NULL;
  20
  21         return (msm_dsi->panel_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 void dsi_destroy(struct msm_dsi *msm_dsi)
  27 {
  28         if (!msm_dsi)
  29                 return;
  30
  31         msm_dsi_manager_unregister(msm_dsi);
  32         if (msm_dsi->host) {
  33                 msm_dsi_host_destroy(msm_dsi->host);
  34                 msm_dsi->host = NULL;
  35         }
  36
  37         platform_set_drvdata(msm_dsi->pdev, NULL);
  38 }
  39
  40 static struct msm_dsi *dsi_init(struct platform_device *pdev)
  41 {
  42         struct msm_dsi *msm_dsi = NULL;
  43         int ret;
  44
  45         if (!pdev) {
  46                 dev_err(&pdev->dev, "no dsi device\n");
  47                 ret = -ENXIO;
  48                 goto fail;
  49         }
  50
  51         msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
  52         if (!msm_dsi) {
  53                 ret = -ENOMEM;
  54                 goto fail;
  55         }
  56         DBG("dsi probed=%p", msm_dsi);
  57
  58         msm_dsi->pdev = pdev;
  59         platform_set_drvdata(pdev, msm_dsi);
  60
  61         /* Init dsi host */
  62         ret = msm_dsi_host_init(msm_dsi);
  63         if (ret)
  64                 goto fail;
  65
  66         /* Register to dsi manager */
  67         ret = msm_dsi_manager_register(msm_dsi);
  68         if (ret)
  69                 goto fail;
  70
  71         return msm_dsi;
  72
  73 fail:
  74         if (msm_dsi)
  75                 dsi_destroy(msm_dsi);
  76
  77         return ERR_PTR(ret);
  78 }
  79
  80 static int dsi_bind(struct device *dev, struct device *master, void *data)
  81 {
  82         struct drm_device *drm = dev_get_drvdata(master);
  83         struct msm_drm_private *priv = drm->dev_private;
  84         struct platform_device *pdev = to_platform_device(dev);
  85         struct msm_dsi *msm_dsi;
  86
  87         DBG("");
  88         msm_dsi = dsi_init(pdev);
  89         if (IS_ERR(msm_dsi))
  90                 return PTR_ERR(msm_dsi);
  91
  92         priv->dsi[msm_dsi->id] = msm_dsi;
  93
  94         return 0;
  95 }
  96
  97 static void dsi_unbind(struct device *dev, struct device *master,
  98                 void *data)
  99 {
 100         struct drm_device *drm = dev_get_drvdata(master);
 101         struct msm_drm_private *priv = drm->dev_private;
 102         struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 103         int id = msm_dsi->id;
 104
 105         if (priv->dsi[id]) {
 106                 dsi_destroy(msm_dsi);
 107                 priv->dsi[id] = NULL;
 108         }
 109 }
 110
 111 static const struct component_ops dsi_ops = {
 112         .bind   = dsi_bind,
 113         .unbind = dsi_unbind,
 114 };
 115
 116 static int dsi_dev_probe(struct platform_device *pdev)
 117 {
 118         return component_add(&pdev->dev, &dsi_ops);
 119 }
 120
 121 static int dsi_dev_remove(struct platform_device *pdev)
 122 {
 123         DBG("");
 124         component_del(&pdev->dev, &dsi_ops);
 125         return 0;
 126 }
 127
 128 static const struct of_device_id dt_match[] = {
 129         { .compatible = "qcom,mdss-dsi-ctrl" },
 130         {}
 131 };
 132
 133 static struct platform_driver dsi_driver = {
 134         .probe = dsi_dev_probe,
 135         .remove = dsi_dev_remove,
 136         .driver = {
 137                 .name = "msm_dsi",
 138                 .of_match_table = dt_match,
 139         },
 140 };
 141
 142 void __init msm_dsi_register(void)
 143 {
 144         DBG("");
 145         platform_driver_register(&dsi_driver);
 146 }
 147
 148 void __exit msm_dsi_unregister(void)
 149 {
 150         DBG("");
 151         platform_driver_unregister(&dsi_driver);
 152 }
 153
 154 int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 155                 struct drm_encoder *encoders[MSM_DSI_ENCODER_NUM])
 156 {
 157         struct msm_drm_private *priv = dev->dev_private;
 158         int ret, i;
 159
 160         if (WARN_ON(!encoders[MSM_DSI_VIDEO_ENCODER_ID] ||
 161                 !encoders[MSM_DSI_CMD_ENCODER_ID]))
 162                 return -EINVAL;
 163
 164         msm_dsi->dev = dev;
 165
 166         ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 167         if (ret) {
 168                 dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
 169                 goto fail;
 170         }
 171
 172         msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 173         if (IS_ERR(msm_dsi->bridge)) {
 174                 ret = PTR_ERR(msm_dsi->bridge);
 175                 dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
 176                 msm_dsi->bridge = NULL;
 177                 goto fail;
 178         }
 179
 180         for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
 181                 encoders[i]->bridge = msm_dsi->bridge;
 182                 msm_dsi->encoders[i] = encoders[i];
 183         }
 184
 185         msm_dsi->connector = msm_dsi_manager_connector_init(msm_dsi->id);
 186         if (IS_ERR(msm_dsi->connector)) {
 187                 ret = PTR_ERR(msm_dsi->connector);
 188                 dev_err(dev->dev, "failed to create dsi connector: %d\n", ret);
 189                 msm_dsi->connector = NULL;
 190                 goto fail;
 191         }
 192
 193         priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
 194         priv->connectors[priv->num_connectors++] = msm_dsi->connector;
 195
 196         return 0;
 197 fail:
 198         if (msm_dsi) {
 199                 /* bridge/connector are normally destroyed by drm: */
 200                 if (msm_dsi->bridge) {
 201                         msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
 202                         msm_dsi->bridge = NULL;
 203                 }
 204                 if (msm_dsi->connector) {
 205                         msm_dsi->connector->funcs->destroy(msm_dsi->connector);
 206                         msm_dsi->connector = NULL;
 207                 }
 208         }
 209
 210         return ret;
 211 }
 212