1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Samsung SoC DP (Display Port) interface driver. 4 * 5 * Copyright (C) 2012 Samsung Electronics Co., Ltd. 6 * Author: Jingoo Han <jg1.han@samsung.com> 7 */ 8 9 #include <linux/clk.h> 10 #include <linux/component.h> 11 #include <linux/err.h> 12 #include <linux/module.h> 13 #include <linux/of_graph.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm_runtime.h> 16 #include <video/of_display_timing.h> 17 #include <video/of_videomode.h> 18 #include <video/videomode.h> 19 20 #include <drm/bridge/analogix_dp.h> 21 #include <drm/drm_atomic_helper.h> 22 #include <drm/drm_bridge.h> 23 #include <drm/drm_crtc.h> 24 #include <drm/drm_of.h> 25 #include <drm/drm_panel.h> 26 #include <drm/drm_print.h> 27 #include <drm/drm_probe_helper.h> 28 #include <drm/exynos_drm.h> 29 30 #include "exynos_drm_crtc.h" 31 32 #define to_dp(nm) container_of(nm, struct exynos_dp_device, nm) 33 34 struct exynos_dp_device { 35 struct drm_encoder encoder; 36 struct drm_connector *connector; 37 struct drm_bridge *ptn_bridge; 38 struct drm_device *drm_dev; 39 struct device *dev; 40 41 struct videomode vm; 42 struct analogix_dp_device *adp; 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_DEV_ERROR(dp->dev, 83 "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 0); 111 if (ret) { 112 DRM_DEV_ERROR(dp->dev, 113 "Failed to attach bridge to drm\n"); 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_DEV_ERROR(dp->dev, 149 "failed: of_get_videomode() : %d\n", ret); 150 return ret; 151 } 152 return 0; 153 } 154 155 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 156 { 157 struct exynos_dp_device *dp = dev_get_drvdata(dev); 158 struct drm_encoder *encoder = &dp->encoder; 159 struct drm_device *drm_dev = data; 160 int ret; 161 162 dp->drm_dev = drm_dev; 163 164 if (!dp->plat_data.panel && !dp->ptn_bridge) { 165 ret = exynos_dp_dt_parse_panel(dp); 166 if (ret) 167 return ret; 168 } 169 170 drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, 171 DRM_MODE_ENCODER_TMDS, NULL); 172 173 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 174 175 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 176 if (ret < 0) 177 return ret; 178 179 dp->plat_data.encoder = encoder; 180 181 ret = analogix_dp_bind(dp->adp, dp->drm_dev); 182 if (ret) 183 dp->encoder.funcs->destroy(&dp->encoder); 184 185 return ret; 186 } 187 188 static void exynos_dp_unbind(struct device *dev, struct device *master, 189 void *data) 190 { 191 struct exynos_dp_device *dp = dev_get_drvdata(dev); 192 193 analogix_dp_unbind(dp->adp); 194 dp->encoder.funcs->destroy(&dp->encoder); 195 } 196 197 static const struct component_ops exynos_dp_ops = { 198 .bind = exynos_dp_bind, 199 .unbind = exynos_dp_unbind, 200 }; 201 202 static int exynos_dp_probe(struct platform_device *pdev) 203 { 204 struct device *dev = &pdev->dev; 205 struct device_node *np; 206 struct exynos_dp_device *dp; 207 struct drm_panel *panel; 208 struct drm_bridge *bridge; 209 int ret; 210 211 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 212 GFP_KERNEL); 213 if (!dp) 214 return -ENOMEM; 215 216 dp->dev = dev; 217 /* 218 * We just use the drvdata until driver run into component 219 * add function, and then we would set drvdata to null, so 220 * that analogix dp driver would take charge of the drvdata. 221 */ 222 platform_set_drvdata(pdev, dp); 223 224 /* This is for the backward compatibility. */ 225 np = of_parse_phandle(dev->of_node, "panel", 0); 226 if (np) { 227 dp->plat_data.panel = of_drm_find_panel(np); 228 229 of_node_put(np); 230 if (IS_ERR(dp->plat_data.panel)) 231 return PTR_ERR(dp->plat_data.panel); 232 233 goto out; 234 } 235 236 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 237 if (ret) 238 return ret; 239 240 /* The remote port can be either a panel or a bridge */ 241 dp->plat_data.panel = panel; 242 dp->plat_data.dev_type = EXYNOS_DP; 243 dp->plat_data.power_on_start = exynos_dp_poweron; 244 dp->plat_data.power_off = exynos_dp_poweroff; 245 dp->plat_data.attach = exynos_dp_bridge_attach; 246 dp->plat_data.get_modes = exynos_dp_get_modes; 247 dp->plat_data.skip_connector = !!bridge; 248 249 dp->ptn_bridge = bridge; 250 251 out: 252 dp->adp = analogix_dp_probe(dev, &dp->plat_data); 253 if (IS_ERR(dp->adp)) 254 return PTR_ERR(dp->adp); 255 256 return component_add(&pdev->dev, &exynos_dp_ops); 257 } 258 259 static int exynos_dp_remove(struct platform_device *pdev) 260 { 261 struct exynos_dp_device *dp = platform_get_drvdata(pdev); 262 263 component_del(&pdev->dev, &exynos_dp_ops); 264 analogix_dp_remove(dp->adp); 265 266 return 0; 267 } 268 269 #ifdef CONFIG_PM 270 static int exynos_dp_suspend(struct device *dev) 271 { 272 struct exynos_dp_device *dp = dev_get_drvdata(dev); 273 274 return analogix_dp_suspend(dp->adp); 275 } 276 277 static int exynos_dp_resume(struct device *dev) 278 { 279 struct exynos_dp_device *dp = dev_get_drvdata(dev); 280 281 return analogix_dp_resume(dp->adp); 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 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 288 pm_runtime_force_resume) 289 }; 290 291 static const struct of_device_id exynos_dp_match[] = { 292 { .compatible = "samsung,exynos5-dp" }, 293 {}, 294 }; 295 MODULE_DEVICE_TABLE(of, exynos_dp_match); 296 297 struct platform_driver dp_driver = { 298 .probe = exynos_dp_probe, 299 .remove = exynos_dp_remove, 300 .driver = { 301 .name = "exynos-dp", 302 .owner = THIS_MODULE, 303 .pm = &exynos_dp_pm_ops, 304 .of_match_table = exynos_dp_match, 305 }, 306 }; 307 308 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 309 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 310 MODULE_LICENSE("GPL v2"); 311