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