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_plat_data plat_data; 45 }; 46 47 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data, 48 bool enable) 49 { 50 struct exynos_dp_device *dp = to_dp(plat_data); 51 struct drm_encoder *encoder = &dp->encoder; 52 53 if (!encoder->crtc) 54 return -EPERM; 55 56 exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable); 57 58 return 0; 59 } 60 61 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data) 62 { 63 return exynos_dp_crtc_clock_enable(plat_data, true); 64 } 65 66 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data) 67 { 68 return exynos_dp_crtc_clock_enable(plat_data, false); 69 } 70 71 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data, 72 struct drm_connector *connector) 73 { 74 struct exynos_dp_device *dp = to_dp(plat_data); 75 struct drm_display_mode *mode; 76 int num_modes = 0; 77 78 if (dp->plat_data.panel) 79 return num_modes; 80 81 mode = drm_mode_create(connector->dev); 82 if (!mode) { 83 DRM_ERROR("failed to create a new display mode.\n"); 84 return num_modes; 85 } 86 87 drm_display_mode_from_videomode(&dp->vm, mode); 88 connector->display_info.width_mm = mode->width_mm; 89 connector->display_info.height_mm = mode->height_mm; 90 91 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 92 drm_mode_set_name(mode); 93 drm_mode_probed_add(connector, mode); 94 95 return num_modes + 1; 96 } 97 98 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data, 99 struct drm_bridge *bridge, 100 struct drm_connector *connector) 101 { 102 struct exynos_dp_device *dp = to_dp(plat_data); 103 int ret; 104 105 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 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 drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, 183 DRM_MODE_ENCODER_TMDS, NULL); 184 185 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 186 187 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 188 if (ret < 0) 189 return ret; 190 191 dp->plat_data.encoder = encoder; 192 193 return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data); 194 } 195 196 static void exynos_dp_unbind(struct device *dev, struct device *master, 197 void *data) 198 { 199 return analogix_dp_unbind(dev, master, data); 200 } 201 202 static const struct component_ops exynos_dp_ops = { 203 .bind = exynos_dp_bind, 204 .unbind = exynos_dp_unbind, 205 }; 206 207 static int exynos_dp_probe(struct platform_device *pdev) 208 { 209 struct device *dev = &pdev->dev; 210 struct device_node *np; 211 struct exynos_dp_device *dp; 212 struct drm_panel *panel; 213 struct drm_bridge *bridge; 214 int ret; 215 216 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 217 GFP_KERNEL); 218 if (!dp) 219 return -ENOMEM; 220 221 /* 222 * We just use the drvdata until driver run into component 223 * add function, and then we would set drvdata to null, so 224 * that analogix dp driver would take charge of the drvdata. 225 */ 226 platform_set_drvdata(pdev, dp); 227 228 /* This is for the backward compatibility. */ 229 np = of_parse_phandle(dev->of_node, "panel", 0); 230 if (np) { 231 dp->plat_data.panel = of_drm_find_panel(np); 232 of_node_put(np); 233 if (!dp->plat_data.panel) 234 return -EPROBE_DEFER; 235 goto out; 236 } 237 238 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 239 if (ret) 240 return ret; 241 242 /* The remote port can be either a panel or a bridge */ 243 dp->plat_data.panel = panel; 244 dp->ptn_bridge = bridge; 245 246 out: 247 return component_add(&pdev->dev, &exynos_dp_ops); 248 } 249 250 static int exynos_dp_remove(struct platform_device *pdev) 251 { 252 component_del(&pdev->dev, &exynos_dp_ops); 253 254 return 0; 255 } 256 257 #ifdef CONFIG_PM 258 static int exynos_dp_suspend(struct device *dev) 259 { 260 return analogix_dp_suspend(dev); 261 } 262 263 static int exynos_dp_resume(struct device *dev) 264 { 265 return analogix_dp_resume(dev); 266 } 267 #endif 268 269 static const struct dev_pm_ops exynos_dp_pm_ops = { 270 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) 271 }; 272 273 static const struct of_device_id exynos_dp_match[] = { 274 { .compatible = "samsung,exynos5-dp" }, 275 {}, 276 }; 277 MODULE_DEVICE_TABLE(of, exynos_dp_match); 278 279 struct platform_driver dp_driver = { 280 .probe = exynos_dp_probe, 281 .remove = exynos_dp_remove, 282 .driver = { 283 .name = "exynos-dp", 284 .owner = THIS_MODULE, 285 .pm = &exynos_dp_pm_ops, 286 .of_match_table = exynos_dp_match, 287 }, 288 }; 289 290 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 291 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 292 MODULE_LICENSE("GPL v2"); 293