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 if (ret) { 111 DRM_DEV_ERROR(dp->dev, 112 "Failed to attach bridge to drm\n"); 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_DEV_ERROR(dp->dev, 148 "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); 235 236 of_node_put(np); 237 if (IS_ERR(dp->plat_data.panel)) 238 return PTR_ERR(dp->plat_data.panel); 239 240 goto out; 241 } 242 243 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 244 if (ret) 245 return ret; 246 247 /* The remote port can be either a panel or a bridge */ 248 dp->plat_data.panel = panel; 249 dp->plat_data.skip_connector = !!bridge; 250 dp->ptn_bridge = bridge; 251 252 out: 253 return component_add(&pdev->dev, &exynos_dp_ops); 254 } 255 256 static int exynos_dp_remove(struct platform_device *pdev) 257 { 258 component_del(&pdev->dev, &exynos_dp_ops); 259 260 return 0; 261 } 262 263 #ifdef CONFIG_PM 264 static int exynos_dp_suspend(struct device *dev) 265 { 266 struct exynos_dp_device *dp = dev_get_drvdata(dev); 267 268 return analogix_dp_suspend(dp->adp); 269 } 270 271 static int exynos_dp_resume(struct device *dev) 272 { 273 struct exynos_dp_device *dp = dev_get_drvdata(dev); 274 275 return analogix_dp_resume(dp->adp); 276 } 277 #endif 278 279 static const struct dev_pm_ops exynos_dp_pm_ops = { 280 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) 281 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 282 pm_runtime_force_resume) 283 }; 284 285 static const struct of_device_id exynos_dp_match[] = { 286 { .compatible = "samsung,exynos5-dp" }, 287 {}, 288 }; 289 MODULE_DEVICE_TABLE(of, exynos_dp_match); 290 291 struct platform_driver dp_driver = { 292 .probe = exynos_dp_probe, 293 .remove = exynos_dp_remove, 294 .driver = { 295 .name = "exynos-dp", 296 .owner = THIS_MODULE, 297 .pm = &exynos_dp_pm_ops, 298 .of_match_table = exynos_dp_match, 299 }, 300 }; 301 302 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 303 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 304 MODULE_LICENSE("GPL v2"); 305