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 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 = NULL;
  78         int ret;
  79
  80         if (!pdev) {
  81                 ret = -ENXIO;
  82                 goto fail;
  83         }
  84
  85         msm_dsi = devm_kzalloc(&pdev->dev, sizeof(*msm_dsi), GFP_KERNEL);
  86         if (!msm_dsi) {
  87                 ret = -ENOMEM;
  88                 goto fail;
  89         }
  90         DBG("dsi probed=%p", msm_dsi);
  91
  92         msm_dsi->pdev = pdev;
  93         platform_set_drvdata(pdev, msm_dsi);
  94
  95         /* Init dsi host */
  96         ret = msm_dsi_host_init(msm_dsi);
  97         if (ret)
  98                 goto fail;
  99
 100         /* GET dsi PHY */
 101         ret = dsi_get_phy(msm_dsi);
 102         if (ret)
 103                 goto fail;
 104
 105         /* Register to dsi manager */
 106         ret = msm_dsi_manager_register(msm_dsi);
 107         if (ret)
 108                 goto fail;
 109
 110         return msm_dsi;
 111
 112 fail:
 113         if (msm_dsi)
 114                 dsi_destroy(msm_dsi);
 115
 116         return ERR_PTR(ret);
 117 }
 118
 119 static int dsi_bind(struct device *dev, struct device *master, void *data)
 120 {
 121         struct drm_device *drm = dev_get_drvdata(master);
 122         struct msm_drm_private *priv = drm->dev_private;
 123         struct platform_device *pdev = to_platform_device(dev);
 124         struct msm_dsi *msm_dsi;
 125
 126         DBG("");
 127         msm_dsi = dsi_init(pdev);
 128         if (IS_ERR(msm_dsi))
 129                 return PTR_ERR(msm_dsi);
 130
 131         priv->dsi[msm_dsi->id] = msm_dsi;
 132
 133         return 0;
 134 }
 135
 136 static void dsi_unbind(struct device *dev, struct device *master,
 137                 void *data)
 138 {
 139         struct drm_device *drm = dev_get_drvdata(master);
 140         struct msm_drm_private *priv = drm->dev_private;
 141         struct msm_dsi *msm_dsi = dev_get_drvdata(dev);
 142         int id = msm_dsi->id;
 143
 144         if (priv->dsi[id]) {
 145                 dsi_destroy(msm_dsi);
 146                 priv->dsi[id] = NULL;
 147         }
 148 }
 149
 150 static const struct component_ops dsi_ops = {
 151         .bind   = dsi_bind,
 152         .unbind = dsi_unbind,
 153 };
 154
 155 static int dsi_dev_probe(struct platform_device *pdev)
 156 {
 157         return component_add(&pdev->dev, &dsi_ops);
 158 }
 159
 160 static int dsi_dev_remove(struct platform_device *pdev)
 161 {
 162         DBG("");
 163         component_del(&pdev->dev, &dsi_ops);
 164         return 0;
 165 }
 166
 167 static const struct of_device_id dt_match[] = {
 168         { .compatible = "qcom,mdss-dsi-ctrl" },
 169         {}
 170 };
 171
 172 static struct platform_driver dsi_driver = {
 173         .probe = dsi_dev_probe,
 174         .remove = dsi_dev_remove,
 175         .driver = {
 176                 .name = "msm_dsi",
 177                 .of_match_table = dt_match,
 178         },
 179 };
 180
 181 void __init msm_dsi_register(void)
 182 {
 183         DBG("");
 184         msm_dsi_phy_driver_register();
 185         platform_driver_register(&dsi_driver);
 186 }
 187
 188 void __exit msm_dsi_unregister(void)
 189 {
 190         DBG("");
 191         msm_dsi_phy_driver_unregister();
 192         platform_driver_unregister(&dsi_driver);
 193 }
 194
 195 int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 196                 struct drm_encoder *encoders[MSM_DSI_ENCODER_NUM])
 197 {
 198         struct msm_drm_private *priv = dev->dev_private;
 199         int ret, i;
 200
 201         if (WARN_ON(!encoders[MSM_DSI_VIDEO_ENCODER_ID] ||
 202                 !encoders[MSM_DSI_CMD_ENCODER_ID]))
 203                 return -EINVAL;
 204
 205         msm_dsi->dev = dev;
 206
 207         ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 208         if (ret) {
 209                 dev_err(dev->dev, "failed to modeset init host: %d\n", ret);
 210                 goto fail;
 211         }
 212
 213         msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
 214         if (IS_ERR(msm_dsi->bridge)) {
 215                 ret = PTR_ERR(msm_dsi->bridge);
 216                 dev_err(dev->dev, "failed to create dsi bridge: %d\n", ret);
 217                 msm_dsi->bridge = NULL;
 218                 goto fail;
 219         }
 220
 221         for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
 222                 encoders[i]->bridge = msm_dsi->bridge;
 223                 msm_dsi->encoders[i] = encoders[i];
 224         }
 225
 226         msm_dsi->connector = msm_dsi_manager_connector_init(msm_dsi->id);
 227         if (IS_ERR(msm_dsi->connector)) {
 228                 ret = PTR_ERR(msm_dsi->connector);
 229                 dev_err(dev->dev, "failed to create dsi connector: %d\n", ret);
 230                 msm_dsi->connector = NULL;
 231                 goto fail;
 232         }
 233
 234         priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
 235         priv->connectors[priv->num_connectors++] = msm_dsi->connector;
 236
 237         return 0;
 238 fail:
 239         if (msm_dsi) {
 240                 /* bridge/connector are normally destroyed by drm: */
 241                 if (msm_dsi->bridge) {
 242                         msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
 243                         msm_dsi->bridge = NULL;
 244                 }
 245                 if (msm_dsi->connector) {
 246                         msm_dsi->connector->funcs->destroy(msm_dsi->connector);
 247                         msm_dsi->connector = NULL;
 248                 }
 249         }
 250
 251         return ret;
 252 }
 253