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