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