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/module.h> 10 #include <linux/platform_device.h> 11 #include <linux/err.h> 12 #include <linux/clk.h> 13 #include <linux/of_graph.h> 14 #include <linux/component.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/drmP.h> 21 #include <drm/drm_atomic_helper.h> 22 #include <drm/drm_crtc.h> 23 #include <drm/drm_of.h> 24 #include <drm/drm_panel.h> 25 #include <drm/drm_probe_helper.h> 26 27 #include <drm/bridge/analogix_dp.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 if (ret) { 111 DRM_DEV_ERROR(dp->dev, 112 "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_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->dev = dev; 163 dp->drm_dev = drm_dev; 164 165 dp->plat_data.dev_type = EXYNOS_DP; 166 dp->plat_data.power_on_start = exynos_dp_poweron; 167 dp->plat_data.power_off = exynos_dp_poweroff; 168 dp->plat_data.attach = exynos_dp_bridge_attach; 169 dp->plat_data.get_modes = exynos_dp_get_modes; 170 171 if (!dp->plat_data.panel && !dp->ptn_bridge) { 172 ret = exynos_dp_dt_parse_panel(dp); 173 if (ret) 174 return ret; 175 } 176 177 drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, 178 DRM_MODE_ENCODER_TMDS, NULL); 179 180 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 181 182 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 183 if (ret < 0) 184 return ret; 185 186 dp->plat_data.encoder = encoder; 187 188 dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data); 189 if (IS_ERR(dp->adp)) { 190 dp->encoder.funcs->destroy(&dp->encoder); 191 return PTR_ERR(dp->adp); 192 } 193 194 return 0; 195 } 196 197 static void exynos_dp_unbind(struct device *dev, struct device *master, 198 void *data) 199 { 200 struct exynos_dp_device *dp = dev_get_drvdata(dev); 201 202 analogix_dp_unbind(dp->adp); 203 dp->encoder.funcs->destroy(&dp->encoder); 204 } 205 206 static const struct component_ops exynos_dp_ops = { 207 .bind = exynos_dp_bind, 208 .unbind = exynos_dp_unbind, 209 }; 210 211 static int exynos_dp_probe(struct platform_device *pdev) 212 { 213 struct device *dev = &pdev->dev; 214 struct device_node *np; 215 struct exynos_dp_device *dp; 216 struct drm_panel *panel; 217 struct drm_bridge *bridge; 218 int ret; 219 220 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 221 GFP_KERNEL); 222 if (!dp) 223 return -ENOMEM; 224 225 /* 226 * We just use the drvdata until driver run into component 227 * add function, and then we would set drvdata to null, so 228 * that analogix dp driver would take charge of the drvdata. 229 */ 230 platform_set_drvdata(pdev, dp); 231 232 /* This is for the backward compatibility. */ 233 np = of_parse_phandle(dev->of_node, "panel", 0); 234 if (np) { 235 dp->plat_data.panel = of_drm_find_panel(np); 236 237 of_node_put(np); 238 if (IS_ERR(dp->plat_data.panel)) 239 return PTR_ERR(dp->plat_data.panel); 240 241 goto out; 242 } 243 244 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 245 if (ret) 246 return ret; 247 248 /* The remote port can be either a panel or a bridge */ 249 dp->plat_data.panel = panel; 250 dp->plat_data.skip_connector = !!bridge; 251 dp->ptn_bridge = bridge; 252 253 out: 254 return component_add(&pdev->dev, &exynos_dp_ops); 255 } 256 257 static int exynos_dp_remove(struct platform_device *pdev) 258 { 259 component_del(&pdev->dev, &exynos_dp_ops); 260 261 return 0; 262 } 263 264 #ifdef CONFIG_PM 265 static int exynos_dp_suspend(struct device *dev) 266 { 267 struct exynos_dp_device *dp = dev_get_drvdata(dev); 268 269 return analogix_dp_suspend(dp->adp); 270 } 271 272 static int exynos_dp_resume(struct device *dev) 273 { 274 struct exynos_dp_device *dp = dev_get_drvdata(dev); 275 276 return analogix_dp_resume(dp->adp); 277 } 278 #endif 279 280 static const struct dev_pm_ops exynos_dp_pm_ops = { 281 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) 282 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 283 pm_runtime_force_resume) 284 }; 285 286 static const struct of_device_id exynos_dp_match[] = { 287 { .compatible = "samsung,exynos5-dp" }, 288 {}, 289 }; 290 MODULE_DEVICE_TABLE(of, exynos_dp_match); 291 292 struct platform_driver dp_driver = { 293 .probe = exynos_dp_probe, 294 .remove = exynos_dp_remove, 295 .driver = { 296 .name = "exynos-dp", 297 .owner = THIS_MODULE, 298 .pm = &exynos_dp_pm_ops, 299 .of_match_table = exynos_dp_match, 300 }, 301 }; 302 303 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 304 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 305 MODULE_LICENSE("GPL v2"); 306