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 DRM_DEV_ERROR(&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 DRM_DEV_ERROR(&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 DRM_DEV_ERROR(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 DRM_DEV_ERROR(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 DRM_DEV_ERROR(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 } 272 273