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 <linux/pm_runtime.h> 20 #include <video/of_display_timing.h> 21 #include <video/of_videomode.h> 22 #include <video/videomode.h> 23 24 #include <drm/drmP.h> 25 #include <drm/drm_atomic_helper.h> 26 #include <drm/drm_crtc.h> 27 #include <drm/drm_of.h> 28 #include <drm/drm_panel.h> 29 #include <drm/drm_probe_helper.h> 30 31 #include <drm/bridge/analogix_dp.h> 32 #include <drm/exynos_drm.h> 33 34 #include "exynos_drm_crtc.h" 35 36 #define to_dp(nm) container_of(nm, struct exynos_dp_device, nm) 37 38 struct exynos_dp_device { 39 struct drm_encoder encoder; 40 struct drm_connector *connector; 41 struct drm_bridge *ptn_bridge; 42 struct drm_device *drm_dev; 43 struct device *dev; 44 45 struct videomode vm; 46 struct analogix_dp_device *adp; 47 struct analogix_dp_plat_data plat_data; 48 }; 49 50 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data, 51 bool enable) 52 { 53 struct exynos_dp_device *dp = to_dp(plat_data); 54 struct drm_encoder *encoder = &dp->encoder; 55 56 if (!encoder->crtc) 57 return -EPERM; 58 59 exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable); 60 61 return 0; 62 } 63 64 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data) 65 { 66 return exynos_dp_crtc_clock_enable(plat_data, true); 67 } 68 69 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data) 70 { 71 return exynos_dp_crtc_clock_enable(plat_data, false); 72 } 73 74 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data, 75 struct drm_connector *connector) 76 { 77 struct exynos_dp_device *dp = to_dp(plat_data); 78 struct drm_display_mode *mode; 79 int num_modes = 0; 80 81 if (dp->plat_data.panel) 82 return num_modes; 83 84 mode = drm_mode_create(connector->dev); 85 if (!mode) { 86 DRM_DEV_ERROR(dp->dev, 87 "failed to create a new display mode.\n"); 88 return num_modes; 89 } 90 91 drm_display_mode_from_videomode(&dp->vm, mode); 92 connector->display_info.width_mm = mode->width_mm; 93 connector->display_info.height_mm = mode->height_mm; 94 95 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 96 drm_mode_set_name(mode); 97 drm_mode_probed_add(connector, mode); 98 99 return num_modes + 1; 100 } 101 102 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data, 103 struct drm_bridge *bridge, 104 struct drm_connector *connector) 105 { 106 struct exynos_dp_device *dp = to_dp(plat_data); 107 int ret; 108 109 dp->connector = connector; 110 111 /* Pre-empt DP connector creation if there's a bridge */ 112 if (dp->ptn_bridge) { 113 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge); 114 if (ret) { 115 DRM_DEV_ERROR(dp->dev, 116 "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_DEV_ERROR(dp->dev, 153 "failed: of_get_videomode() : %d\n", ret); 154 return ret; 155 } 156 return 0; 157 } 158 159 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 160 { 161 struct exynos_dp_device *dp = dev_get_drvdata(dev); 162 struct drm_encoder *encoder = &dp->encoder; 163 struct drm_device *drm_dev = data; 164 int ret; 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_start = 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 drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, 182 DRM_MODE_ENCODER_TMDS, NULL); 183 184 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 185 186 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 187 if (ret < 0) 188 return ret; 189 190 dp->plat_data.encoder = encoder; 191 192 dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data); 193 if (IS_ERR(dp->adp)) { 194 dp->encoder.funcs->destroy(&dp->encoder); 195 return PTR_ERR(dp->adp); 196 } 197 198 return 0; 199 } 200 201 static void exynos_dp_unbind(struct device *dev, struct device *master, 202 void *data) 203 { 204 struct exynos_dp_device *dp = dev_get_drvdata(dev); 205 206 analogix_dp_unbind(dp->adp); 207 dp->encoder.funcs->destroy(&dp->encoder); 208 } 209 210 static const struct component_ops exynos_dp_ops = { 211 .bind = exynos_dp_bind, 212 .unbind = exynos_dp_unbind, 213 }; 214 215 static int exynos_dp_probe(struct platform_device *pdev) 216 { 217 struct device *dev = &pdev->dev; 218 struct device_node *np; 219 struct exynos_dp_device *dp; 220 struct drm_panel *panel; 221 struct drm_bridge *bridge; 222 int ret; 223 224 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 225 GFP_KERNEL); 226 if (!dp) 227 return -ENOMEM; 228 229 /* 230 * We just use the drvdata until driver run into component 231 * add function, and then we would set drvdata to null, so 232 * that analogix dp driver would take charge of the drvdata. 233 */ 234 platform_set_drvdata(pdev, dp); 235 236 /* This is for the backward compatibility. */ 237 np = of_parse_phandle(dev->of_node, "panel", 0); 238 if (np) { 239 dp->plat_data.panel = of_drm_find_panel(np); 240 241 of_node_put(np); 242 if (IS_ERR(dp->plat_data.panel)) 243 return PTR_ERR(dp->plat_data.panel); 244 245 goto out; 246 } 247 248 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 249 if (ret) 250 return ret; 251 252 /* The remote port can be either a panel or a bridge */ 253 dp->plat_data.panel = panel; 254 dp->plat_data.skip_connector = !!bridge; 255 dp->ptn_bridge = bridge; 256 257 out: 258 return component_add(&pdev->dev, &exynos_dp_ops); 259 } 260 261 static int exynos_dp_remove(struct platform_device *pdev) 262 { 263 component_del(&pdev->dev, &exynos_dp_ops); 264 265 return 0; 266 } 267 268 #ifdef CONFIG_PM 269 static int exynos_dp_suspend(struct device *dev) 270 { 271 struct exynos_dp_device *dp = dev_get_drvdata(dev); 272 273 return analogix_dp_suspend(dp->adp); 274 } 275 276 static int exynos_dp_resume(struct device *dev) 277 { 278 struct exynos_dp_device *dp = dev_get_drvdata(dev); 279 280 return analogix_dp_resume(dp->adp); 281 } 282 #endif 283 284 static const struct dev_pm_ops exynos_dp_pm_ops = { 285 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) 286 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 287 pm_runtime_force_resume) 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