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_of.h> 27 #include <drm/drm_panel.h> 28 29 #include <drm/bridge/analogix_dp.h> 30 #include <drm/exynos_drm.h> 31 32 #include "exynos_drm_crtc.h" 33 34 #define to_dp(nm) container_of(nm, struct exynos_dp_device, nm) 35 36 struct exynos_dp_device { 37 struct drm_encoder encoder; 38 struct drm_connector *connector; 39 struct drm_bridge *ptn_bridge; 40 struct drm_device *drm_dev; 41 struct device *dev; 42 43 struct videomode vm; 44 struct analogix_dp_device *adp; 45 struct analogix_dp_plat_data plat_data; 46 }; 47 48 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data, 49 bool enable) 50 { 51 struct exynos_dp_device *dp = to_dp(plat_data); 52 struct drm_encoder *encoder = &dp->encoder; 53 54 if (!encoder->crtc) 55 return -EPERM; 56 57 exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable); 58 59 return 0; 60 } 61 62 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data) 63 { 64 return exynos_dp_crtc_clock_enable(plat_data, true); 65 } 66 67 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data) 68 { 69 return exynos_dp_crtc_clock_enable(plat_data, false); 70 } 71 72 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data, 73 struct drm_connector *connector) 74 { 75 struct exynos_dp_device *dp = to_dp(plat_data); 76 struct drm_display_mode *mode; 77 int num_modes = 0; 78 79 if (dp->plat_data.panel) 80 return num_modes; 81 82 mode = drm_mode_create(connector->dev); 83 if (!mode) { 84 DRM_ERROR("failed to create a new display mode.\n"); 85 return num_modes; 86 } 87 88 drm_display_mode_from_videomode(&dp->vm, mode); 89 connector->display_info.width_mm = mode->width_mm; 90 connector->display_info.height_mm = mode->height_mm; 91 92 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 93 drm_mode_set_name(mode); 94 drm_mode_probed_add(connector, mode); 95 96 return num_modes + 1; 97 } 98 99 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data, 100 struct drm_bridge *bridge, 101 struct drm_connector *connector) 102 { 103 struct exynos_dp_device *dp = to_dp(plat_data); 104 int ret; 105 106 dp->connector = connector; 107 108 /* Pre-empt DP connector creation if there's a bridge */ 109 if (dp->ptn_bridge) { 110 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge); 111 if (ret) { 112 DRM_ERROR("Failed to attach bridge to drm\n"); 113 bridge->next = NULL; 114 return ret; 115 } 116 } 117 118 return 0; 119 } 120 121 static void exynos_dp_mode_set(struct drm_encoder *encoder, 122 struct drm_display_mode *mode, 123 struct drm_display_mode *adjusted_mode) 124 { 125 } 126 127 static void exynos_dp_nop(struct drm_encoder *encoder) 128 { 129 /* do nothing */ 130 } 131 132 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = { 133 .mode_set = exynos_dp_mode_set, 134 .enable = exynos_dp_nop, 135 .disable = exynos_dp_nop, 136 }; 137 138 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = { 139 .destroy = drm_encoder_cleanup, 140 }; 141 142 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp) 143 { 144 int ret; 145 146 ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE); 147 if (ret) { 148 DRM_ERROR("failed: of_get_videomode() : %d\n", ret); 149 return ret; 150 } 151 return 0; 152 } 153 154 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 155 { 156 struct exynos_dp_device *dp = dev_get_drvdata(dev); 157 struct drm_encoder *encoder = &dp->encoder; 158 struct drm_device *drm_dev = data; 159 int ret; 160 161 dp->dev = dev; 162 dp->drm_dev = drm_dev; 163 164 dp->plat_data.dev_type = EXYNOS_DP; 165 dp->plat_data.power_on_start = exynos_dp_poweron; 166 dp->plat_data.power_off = exynos_dp_poweroff; 167 dp->plat_data.attach = exynos_dp_bridge_attach; 168 dp->plat_data.get_modes = exynos_dp_get_modes; 169 170 if (!dp->plat_data.panel && !dp->ptn_bridge) { 171 ret = exynos_dp_dt_parse_panel(dp); 172 if (ret) 173 return ret; 174 } 175 176 drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, 177 DRM_MODE_ENCODER_TMDS, NULL); 178 179 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 180 181 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 182 if (ret < 0) 183 return ret; 184 185 dp->plat_data.encoder = encoder; 186 187 dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data); 188 if (IS_ERR(dp->adp)) { 189 dp->encoder.funcs->destroy(&dp->encoder); 190 return PTR_ERR(dp->adp); 191 } 192 193 return 0; 194 } 195 196 static void exynos_dp_unbind(struct device *dev, struct device *master, 197 void *data) 198 { 199 struct exynos_dp_device *dp = dev_get_drvdata(dev); 200 201 analogix_dp_unbind(dp->adp); 202 dp->encoder.funcs->destroy(&dp->encoder); 203 } 204 205 static const struct component_ops exynos_dp_ops = { 206 .bind = exynos_dp_bind, 207 .unbind = exynos_dp_unbind, 208 }; 209 210 static int exynos_dp_probe(struct platform_device *pdev) 211 { 212 struct device *dev = &pdev->dev; 213 struct device_node *np; 214 struct exynos_dp_device *dp; 215 struct drm_panel *panel; 216 struct drm_bridge *bridge; 217 int ret; 218 219 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 220 GFP_KERNEL); 221 if (!dp) 222 return -ENOMEM; 223 224 /* 225 * We just use the drvdata until driver run into component 226 * add function, and then we would set drvdata to null, so 227 * that analogix dp driver would take charge of the drvdata. 228 */ 229 platform_set_drvdata(pdev, dp); 230 231 /* This is for the backward compatibility. */ 232 np = of_parse_phandle(dev->of_node, "panel", 0); 233 if (np) { 234 dp->plat_data.panel = of_drm_find_panel(np); 235 of_node_put(np); 236 if (!dp->plat_data.panel) 237 return -EPROBE_DEFER; 238 goto out; 239 } 240 241 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 242 if (ret) 243 return ret; 244 245 /* The remote port can be either a panel or a bridge */ 246 dp->plat_data.panel = panel; 247 dp->plat_data.skip_connector = !!bridge; 248 dp->ptn_bridge = bridge; 249 250 out: 251 return component_add(&pdev->dev, &exynos_dp_ops); 252 } 253 254 static int exynos_dp_remove(struct platform_device *pdev) 255 { 256 component_del(&pdev->dev, &exynos_dp_ops); 257 258 return 0; 259 } 260 261 #ifdef CONFIG_PM 262 static int exynos_dp_suspend(struct device *dev) 263 { 264 struct exynos_dp_device *dp = dev_get_drvdata(dev); 265 266 return analogix_dp_suspend(dp->adp); 267 } 268 269 static int exynos_dp_resume(struct device *dev) 270 { 271 struct exynos_dp_device *dp = dev_get_drvdata(dev); 272 273 return analogix_dp_resume(dp->adp); 274 } 275 #endif 276 277 static const struct dev_pm_ops exynos_dp_pm_ops = { 278 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) 279 }; 280 281 static const struct of_device_id exynos_dp_match[] = { 282 { .compatible = "samsung,exynos5-dp" }, 283 {}, 284 }; 285 MODULE_DEVICE_TABLE(of, exynos_dp_match); 286 287 struct platform_driver dp_driver = { 288 .probe = exynos_dp_probe, 289 .remove = exynos_dp_remove, 290 .driver = { 291 .name = "exynos-dp", 292 .owner = THIS_MODULE, 293 .pm = &exynos_dp_pm_ops, 294 .of_match_table = exynos_dp_match, 295 }, 296 }; 297 298 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 299 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 300 MODULE_LICENSE("GPL v2"); 301