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/drm_simple_kms_helper.h> 29 #include <drm/exynos_drm.h> 30 31 #include "exynos_drm_crtc.h" 32 33 #define to_dp(nm) container_of(nm, struct exynos_dp_device, nm) 34 35 struct exynos_dp_device { 36 struct drm_encoder encoder; 37 struct drm_connector *connector; 38 struct drm_bridge *ptn_bridge; 39 struct drm_device *drm_dev; 40 struct device *dev; 41 42 struct videomode vm; 43 struct analogix_dp_device *adp; 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_DEV_ERROR(dp->dev, 84 "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 0); 112 if (ret) { 113 DRM_DEV_ERROR(dp->dev, 114 "Failed to attach bridge to drm\n"); 115 return ret; 116 } 117 } 118 119 return 0; 120 } 121 122 static void exynos_dp_mode_set(struct drm_encoder *encoder, 123 struct drm_display_mode *mode, 124 struct drm_display_mode *adjusted_mode) 125 { 126 } 127 128 static void exynos_dp_nop(struct drm_encoder *encoder) 129 { 130 /* do nothing */ 131 } 132 133 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = { 134 .mode_set = exynos_dp_mode_set, 135 .enable = exynos_dp_nop, 136 .disable = exynos_dp_nop, 137 }; 138 139 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp) 140 { 141 int ret; 142 143 ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE); 144 if (ret) { 145 DRM_DEV_ERROR(dp->dev, 146 "failed: of_get_videomode() : %d\n", ret); 147 return ret; 148 } 149 return 0; 150 } 151 152 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 153 { 154 struct exynos_dp_device *dp = dev_get_drvdata(dev); 155 struct drm_encoder *encoder = &dp->encoder; 156 struct drm_device *drm_dev = data; 157 int ret; 158 159 dp->drm_dev = drm_dev; 160 161 if (!dp->plat_data.panel && !dp->ptn_bridge) { 162 ret = exynos_dp_dt_parse_panel(dp); 163 if (ret) 164 return ret; 165 } 166 167 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS); 168 169 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 170 171 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 172 if (ret < 0) 173 return ret; 174 175 dp->plat_data.encoder = encoder; 176 177 ret = analogix_dp_bind(dp->adp, dp->drm_dev); 178 if (ret) 179 dp->encoder.funcs->destroy(&dp->encoder); 180 181 return ret; 182 } 183 184 static void exynos_dp_unbind(struct device *dev, struct device *master, 185 void *data) 186 { 187 struct exynos_dp_device *dp = dev_get_drvdata(dev); 188 189 analogix_dp_unbind(dp->adp); 190 dp->encoder.funcs->destroy(&dp->encoder); 191 } 192 193 static const struct component_ops exynos_dp_ops = { 194 .bind = exynos_dp_bind, 195 .unbind = exynos_dp_unbind, 196 }; 197 198 static int exynos_dp_probe(struct platform_device *pdev) 199 { 200 struct device *dev = &pdev->dev; 201 struct device_node *np; 202 struct exynos_dp_device *dp; 203 struct drm_panel *panel; 204 struct drm_bridge *bridge; 205 int ret; 206 207 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 208 GFP_KERNEL); 209 if (!dp) 210 return -ENOMEM; 211 212 dp->dev = dev; 213 /* 214 * We just use the drvdata until driver run into component 215 * add function, and then we would set drvdata to null, so 216 * that analogix dp driver would take charge of the drvdata. 217 */ 218 platform_set_drvdata(pdev, dp); 219 220 /* This is for the backward compatibility. */ 221 np = of_parse_phandle(dev->of_node, "panel", 0); 222 if (np) { 223 dp->plat_data.panel = of_drm_find_panel(np); 224 225 of_node_put(np); 226 if (IS_ERR(dp->plat_data.panel)) 227 return PTR_ERR(dp->plat_data.panel); 228 229 goto out; 230 } 231 232 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 233 if (ret) 234 return ret; 235 236 /* The remote port can be either a panel or a bridge */ 237 dp->plat_data.panel = panel; 238 dp->plat_data.dev_type = EXYNOS_DP; 239 dp->plat_data.power_on_start = exynos_dp_poweron; 240 dp->plat_data.power_off = exynos_dp_poweroff; 241 dp->plat_data.attach = exynos_dp_bridge_attach; 242 dp->plat_data.get_modes = exynos_dp_get_modes; 243 dp->plat_data.skip_connector = !!bridge; 244 245 dp->ptn_bridge = bridge; 246 247 out: 248 dp->adp = analogix_dp_probe(dev, &dp->plat_data); 249 if (IS_ERR(dp->adp)) 250 return PTR_ERR(dp->adp); 251 252 return component_add(&pdev->dev, &exynos_dp_ops); 253 } 254 255 static int exynos_dp_remove(struct platform_device *pdev) 256 { 257 struct exynos_dp_device *dp = platform_get_drvdata(pdev); 258 259 component_del(&pdev->dev, &exynos_dp_ops); 260 analogix_dp_remove(dp->adp); 261 262 return 0; 263 } 264 265 #ifdef CONFIG_PM 266 static int exynos_dp_suspend(struct device *dev) 267 { 268 struct exynos_dp_device *dp = dev_get_drvdata(dev); 269 270 return analogix_dp_suspend(dp->adp); 271 } 272 273 static int exynos_dp_resume(struct device *dev) 274 { 275 struct exynos_dp_device *dp = dev_get_drvdata(dev); 276 277 return analogix_dp_resume(dp->adp); 278 } 279 #endif 280 281 static const struct dev_pm_ops exynos_dp_pm_ops = { 282 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) 283 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 284 pm_runtime_force_resume) 285 }; 286 287 static const struct of_device_id exynos_dp_match[] = { 288 { .compatible = "samsung,exynos5-dp" }, 289 {}, 290 }; 291 MODULE_DEVICE_TABLE(of, exynos_dp_match); 292 293 struct platform_driver dp_driver = { 294 .probe = exynos_dp_probe, 295 .remove = exynos_dp_remove, 296 .driver = { 297 .name = "exynos-dp", 298 .owner = THIS_MODULE, 299 .pm = &exynos_dp_pm_ops, 300 .of_match_table = exynos_dp_match, 301 }, 302 }; 303 304 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 305 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 306 MODULE_LICENSE("GPL v2"); 307