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