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_ERROR("failed to create a new display mode.\n"); 87 return num_modes; 88 } 89 90 drm_display_mode_from_videomode(&dp->vm, mode); 91 connector->display_info.width_mm = mode->width_mm; 92 connector->display_info.height_mm = mode->height_mm; 93 94 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 95 drm_mode_set_name(mode); 96 drm_mode_probed_add(connector, mode); 97 98 return num_modes + 1; 99 } 100 101 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data, 102 struct drm_bridge *bridge, 103 struct drm_connector *connector) 104 { 105 struct exynos_dp_device *dp = to_dp(plat_data); 106 int ret; 107 108 dp->connector = connector; 109 110 /* Pre-empt DP connector creation if there's a bridge */ 111 if (dp->ptn_bridge) { 112 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge); 113 if (ret) { 114 DRM_ERROR("Failed to attach bridge to drm\n"); 115 bridge->next = NULL; 116 return ret; 117 } 118 } 119 120 return 0; 121 } 122 123 static void exynos_dp_mode_set(struct drm_encoder *encoder, 124 struct drm_display_mode *mode, 125 struct drm_display_mode *adjusted_mode) 126 { 127 } 128 129 static void exynos_dp_nop(struct drm_encoder *encoder) 130 { 131 /* do nothing */ 132 } 133 134 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = { 135 .mode_set = exynos_dp_mode_set, 136 .enable = exynos_dp_nop, 137 .disable = exynos_dp_nop, 138 }; 139 140 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = { 141 .destroy = drm_encoder_cleanup, 142 }; 143 144 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp) 145 { 146 int ret; 147 148 ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE); 149 if (ret) { 150 DRM_ERROR("failed: of_get_videomode() : %d\n", ret); 151 return ret; 152 } 153 return 0; 154 } 155 156 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 157 { 158 struct exynos_dp_device *dp = dev_get_drvdata(dev); 159 struct drm_encoder *encoder = &dp->encoder; 160 struct drm_device *drm_dev = data; 161 int ret; 162 163 dp->dev = dev; 164 dp->drm_dev = drm_dev; 165 166 dp->plat_data.dev_type = EXYNOS_DP; 167 dp->plat_data.power_on_start = exynos_dp_poweron; 168 dp->plat_data.power_off = exynos_dp_poweroff; 169 dp->plat_data.attach = exynos_dp_bridge_attach; 170 dp->plat_data.get_modes = exynos_dp_get_modes; 171 172 if (!dp->plat_data.panel && !dp->ptn_bridge) { 173 ret = exynos_dp_dt_parse_panel(dp); 174 if (ret) 175 return ret; 176 } 177 178 drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, 179 DRM_MODE_ENCODER_TMDS, NULL); 180 181 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 182 183 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 184 if (ret < 0) 185 return ret; 186 187 dp->plat_data.encoder = encoder; 188 189 dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data); 190 if (IS_ERR(dp->adp)) { 191 dp->encoder.funcs->destroy(&dp->encoder); 192 return PTR_ERR(dp->adp); 193 } 194 195 return 0; 196 } 197 198 static void exynos_dp_unbind(struct device *dev, struct device *master, 199 void *data) 200 { 201 struct exynos_dp_device *dp = dev_get_drvdata(dev); 202 203 analogix_dp_unbind(dp->adp); 204 dp->encoder.funcs->destroy(&dp->encoder); 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; 216 struct exynos_dp_device *dp; 217 struct drm_panel *panel; 218 struct drm_bridge *bridge; 219 int ret; 220 221 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 222 GFP_KERNEL); 223 if (!dp) 224 return -ENOMEM; 225 226 /* 227 * We just use the drvdata until driver run into component 228 * add function, and then we would set drvdata to null, so 229 * that analogix dp driver would take charge of the drvdata. 230 */ 231 platform_set_drvdata(pdev, dp); 232 233 /* This is for the backward compatibility. */ 234 np = of_parse_phandle(dev->of_node, "panel", 0); 235 if (np) { 236 dp->plat_data.panel = of_drm_find_panel(np); 237 238 of_node_put(np); 239 if (IS_ERR(dp->plat_data.panel)) 240 return PTR_ERR(dp->plat_data.panel); 241 242 goto out; 243 } 244 245 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 246 if (ret) 247 return ret; 248 249 /* The remote port can be either a panel or a bridge */ 250 dp->plat_data.panel = panel; 251 dp->plat_data.skip_connector = !!bridge; 252 dp->ptn_bridge = bridge; 253 254 out: 255 return component_add(&pdev->dev, &exynos_dp_ops); 256 } 257 258 static int exynos_dp_remove(struct platform_device *pdev) 259 { 260 component_del(&pdev->dev, &exynos_dp_ops); 261 262 return 0; 263 } 264 265 #ifdef CONFIG_PM 266 static int exynos_dp_suspend(struct device *dev) 267 { 268 struct exynos_dp_device *dp = dev_get_drvdata(dev); 269 270 return analogix_dp_suspend(dp->adp); 271 } 272 273 static int exynos_dp_resume(struct device *dev) 274 { 275 struct exynos_dp_device *dp = dev_get_drvdata(dev); 276 277 return analogix_dp_resume(dp->adp); 278 } 279 #endif 280 281 static const struct dev_pm_ops exynos_dp_pm_ops = { 282 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) 283 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 284 pm_runtime_force_resume) 285 }; 286 287 static const struct of_device_id exynos_dp_match[] = { 288 { .compatible = "samsung,exynos5-dp" }, 289 {}, 290 }; 291 MODULE_DEVICE_TABLE(of, exynos_dp_match); 292 293 struct platform_driver dp_driver = { 294 .probe = exynos_dp_probe, 295 .remove = exynos_dp_remove, 296 .driver = { 297 .name = "exynos-dp", 298 .owner = THIS_MODULE, 299 .pm = &exynos_dp_pm_ops, 300 .of_match_table = exynos_dp_match, 301 }, 302 }; 303 304 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 305 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 306 MODULE_LICENSE("GPL v2"); 307