1 /* 2 * Samsung SoC DP (Display Port) interface driver. 3 * 4 * Copyright (C) 2012 Samsung Electronics Co., Ltd. 5 * Author: Jingoo Han <jg1.han@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/platform_device.h> 15 #include <linux/err.h> 16 #include <linux/clk.h> 17 #include <linux/of_graph.h> 18 #include <linux/component.h> 19 #include <video/of_display_timing.h> 20 #include <video/of_videomode.h> 21 #include <video/videomode.h> 22 23 #include <drm/drmP.h> 24 #include <drm/drm_crtc.h> 25 #include <drm/drm_crtc_helper.h> 26 #include <drm/drm_panel.h> 27 28 #include <drm/bridge/analogix_dp.h> 29 #include <drm/exynos_drm.h> 30 31 #include "exynos_drm_crtc.h" 32 33 #define to_dp(nm) container_of(nm, struct exynos_dp_device, nm) 34 35 struct exynos_dp_device { 36 struct drm_encoder encoder; 37 struct drm_connector connector; 38 struct drm_bridge *ptn_bridge; 39 struct drm_device *drm_dev; 40 struct device *dev; 41 42 struct videomode vm; 43 struct analogix_dp_plat_data plat_data; 44 }; 45 46 int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data, 47 bool enable) 48 { 49 struct exynos_dp_device *dp = to_dp(plat_data); 50 struct drm_encoder *encoder = &dp->encoder; 51 struct exynos_drm_crtc *crtc; 52 53 if (!encoder) 54 return -1; 55 56 crtc = to_exynos_crtc(encoder->crtc); 57 if (crtc && crtc->ops && crtc->ops->clock_enable) 58 crtc->ops->clock_enable(crtc, enable); 59 60 return 0; 61 } 62 63 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data) 64 { 65 return exynos_dp_crtc_clock_enable(plat_data, true); 66 } 67 68 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data) 69 { 70 return exynos_dp_crtc_clock_enable(plat_data, false); 71 } 72 73 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data) 74 { 75 struct exynos_dp_device *dp = to_dp(plat_data); 76 struct drm_connector *connector = &dp->connector; 77 struct drm_display_mode *mode; 78 int num_modes = 0; 79 80 if (dp->plat_data.panel) 81 return num_modes; 82 83 mode = drm_mode_create(connector->dev); 84 if (!mode) { 85 DRM_ERROR("failed to create a new display mode.\n"); 86 return num_modes; 87 } 88 89 drm_display_mode_from_videomode(&dp->vm, mode); 90 connector->display_info.width_mm = mode->width_mm; 91 connector->display_info.height_mm = mode->height_mm; 92 93 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 94 drm_mode_set_name(mode); 95 drm_mode_probed_add(connector, mode); 96 97 return num_modes + 1; 98 } 99 100 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data, 101 struct drm_bridge *bridge, 102 struct drm_connector *connector) 103 { 104 struct exynos_dp_device *dp = to_dp(plat_data); 105 struct drm_encoder *encoder = &dp->encoder; 106 int ret; 107 108 drm_connector_register(connector); 109 110 /* Pre-empt DP connector creation if there's a bridge */ 111 if (dp->ptn_bridge) { 112 bridge->next = dp->ptn_bridge; 113 dp->ptn_bridge->encoder = encoder; 114 ret = drm_bridge_attach(encoder->dev, dp->ptn_bridge); 115 if (ret) { 116 DRM_ERROR("Failed to attach bridge to drm\n"); 117 bridge->next = NULL; 118 return ret; 119 } 120 } 121 122 return 0; 123 } 124 125 static void exynos_dp_mode_set(struct drm_encoder *encoder, 126 struct drm_display_mode *mode, 127 struct drm_display_mode *adjusted_mode) 128 { 129 } 130 131 static void exynos_dp_nop(struct drm_encoder *encoder) 132 { 133 /* do nothing */ 134 } 135 136 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = { 137 .mode_set = exynos_dp_mode_set, 138 .enable = exynos_dp_nop, 139 .disable = exynos_dp_nop, 140 }; 141 142 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = { 143 .destroy = drm_encoder_cleanup, 144 }; 145 146 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp) 147 { 148 int ret; 149 150 ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE); 151 if (ret) { 152 DRM_ERROR("failed: of_get_videomode() : %d\n", ret); 153 return ret; 154 } 155 return 0; 156 } 157 158 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 159 { 160 struct exynos_dp_device *dp = dev_get_drvdata(dev); 161 struct drm_encoder *encoder = &dp->encoder; 162 struct drm_device *drm_dev = data; 163 int pipe, ret; 164 165 /* 166 * Just like the probe function said, we don't need the 167 * device drvrate anymore, we should leave the charge to 168 * analogix dp driver, set the device drvdata to NULL. 169 */ 170 dev_set_drvdata(dev, NULL); 171 172 dp->dev = dev; 173 dp->drm_dev = drm_dev; 174 175 dp->plat_data.dev_type = EXYNOS_DP; 176 dp->plat_data.power_on = exynos_dp_poweron; 177 dp->plat_data.power_off = exynos_dp_poweroff; 178 dp->plat_data.attach = exynos_dp_bridge_attach; 179 dp->plat_data.get_modes = exynos_dp_get_modes; 180 181 if (!dp->plat_data.panel && !dp->ptn_bridge) { 182 ret = exynos_dp_dt_parse_panel(dp); 183 if (ret) 184 return ret; 185 } 186 187 pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev, 188 EXYNOS_DISPLAY_TYPE_LCD); 189 if (pipe < 0) 190 return pipe; 191 192 encoder->possible_crtcs = 1 << pipe; 193 194 DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs); 195 196 drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, 197 DRM_MODE_ENCODER_TMDS, NULL); 198 199 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 200 201 dp->plat_data.encoder = encoder; 202 203 return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data); 204 } 205 206 static void exynos_dp_unbind(struct device *dev, struct device *master, 207 void *data) 208 { 209 return analogix_dp_unbind(dev, master, data); 210 } 211 212 static const struct component_ops exynos_dp_ops = { 213 .bind = exynos_dp_bind, 214 .unbind = exynos_dp_unbind, 215 }; 216 217 static int exynos_dp_probe(struct platform_device *pdev) 218 { 219 struct device *dev = &pdev->dev; 220 struct device_node *np = NULL, *endpoint = NULL; 221 struct exynos_dp_device *dp; 222 223 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 224 GFP_KERNEL); 225 if (!dp) 226 return -ENOMEM; 227 228 /* 229 * We just use the drvdata until driver run into component 230 * add function, and then we would set drvdata to null, so 231 * that analogix dp driver would take charge of the drvdata. 232 */ 233 platform_set_drvdata(pdev, dp); 234 235 /* This is for the backward compatibility. */ 236 np = of_parse_phandle(dev->of_node, "panel", 0); 237 if (np) { 238 dp->plat_data.panel = of_drm_find_panel(np); 239 of_node_put(np); 240 if (!dp->plat_data.panel) 241 return -EPROBE_DEFER; 242 goto out; 243 } 244 245 endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); 246 if (endpoint) { 247 np = of_graph_get_remote_port_parent(endpoint); 248 if (np) { 249 /* The remote port can be either a panel or a bridge */ 250 dp->plat_data.panel = of_drm_find_panel(np); 251 if (!dp->plat_data.panel) { 252 dp->ptn_bridge = of_drm_find_bridge(np); 253 if (!dp->ptn_bridge) { 254 of_node_put(np); 255 return -EPROBE_DEFER; 256 } 257 } 258 of_node_put(np); 259 } else { 260 DRM_ERROR("no remote endpoint device node found.\n"); 261 return -EINVAL; 262 } 263 } else { 264 DRM_ERROR("no port endpoint subnode found.\n"); 265 return -EINVAL; 266 } 267 268 out: 269 return component_add(&pdev->dev, &exynos_dp_ops); 270 } 271 272 static int exynos_dp_remove(struct platform_device *pdev) 273 { 274 component_del(&pdev->dev, &exynos_dp_ops); 275 276 return 0; 277 } 278 279 #ifdef CONFIG_PM 280 static int exynos_dp_suspend(struct device *dev) 281 { 282 return analogix_dp_suspend(dev); 283 } 284 285 static int exynos_dp_resume(struct device *dev) 286 { 287 return analogix_dp_resume(dev); 288 } 289 #endif 290 291 static const struct dev_pm_ops exynos_dp_pm_ops = { 292 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) 293 }; 294 295 static const struct of_device_id exynos_dp_match[] = { 296 { .compatible = "samsung,exynos5-dp" }, 297 {}, 298 }; 299 MODULE_DEVICE_TABLE(of, exynos_dp_match); 300 301 struct platform_driver dp_driver = { 302 .probe = exynos_dp_probe, 303 .remove = exynos_dp_remove, 304 .driver = { 305 .name = "exynos-dp", 306 .owner = THIS_MODULE, 307 .pm = &exynos_dp_pm_ops, 308 .of_match_table = exynos_dp_match, 309 }, 310 }; 311 312 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 313 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 314 MODULE_LICENSE("GPL v2"); 315