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.h> 14 #include <linux/of_graph.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_runtime.h> 17 #include <video/of_display_timing.h> 18 #include <video/of_videomode.h> 19 #include <video/videomode.h> 20 21 #include <drm/bridge/analogix_dp.h> 22 #include <drm/drm_atomic_helper.h> 23 #include <drm/drm_bridge.h> 24 #include <drm/drm_crtc.h> 25 #include <drm/drm_of.h> 26 #include <drm/drm_panel.h> 27 #include <drm/drm_print.h> 28 #include <drm/drm_probe_helper.h> 29 #include <drm/drm_simple_kms_helper.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_device *adp; 45 struct analogix_dp_plat_data plat_data; 46 }; 47 48 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data, 49 bool enable) 50 { 51 struct exynos_dp_device *dp = to_dp(plat_data); 52 struct drm_encoder *encoder = &dp->encoder; 53 54 if (!encoder->crtc) 55 return -EPERM; 56 57 exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable); 58 59 return 0; 60 } 61 62 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data) 63 { 64 return exynos_dp_crtc_clock_enable(plat_data, true); 65 } 66 67 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data) 68 { 69 return exynos_dp_crtc_clock_enable(plat_data, false); 70 } 71 72 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data, 73 struct drm_connector *connector) 74 { 75 struct exynos_dp_device *dp = to_dp(plat_data); 76 struct drm_display_mode *mode; 77 int num_modes = 0; 78 79 if (dp->plat_data.panel) 80 return num_modes; 81 82 mode = drm_mode_create(connector->dev); 83 if (!mode) { 84 DRM_DEV_ERROR(dp->dev, 85 "failed to create a new display mode.\n"); 86 return num_modes; 87 } 88 89 drm_display_mode_from_videomode(&dp->vm, mode); 90 connector->display_info.width_mm = mode->width_mm; 91 connector->display_info.height_mm = mode->height_mm; 92 93 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 94 drm_mode_set_name(mode); 95 drm_mode_probed_add(connector, mode); 96 97 return num_modes + 1; 98 } 99 100 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data, 101 struct drm_bridge *bridge, 102 struct drm_connector *connector) 103 { 104 struct exynos_dp_device *dp = to_dp(plat_data); 105 int ret; 106 107 dp->connector = connector; 108 109 /* Pre-empt DP connector creation if there's a bridge */ 110 if (dp->ptn_bridge) { 111 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge, 112 0); 113 if (ret) 114 return ret; 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 int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp) 138 { 139 int ret; 140 141 ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE); 142 if (ret) { 143 DRM_DEV_ERROR(dp->dev, 144 "failed: of_get_videomode() : %d\n", ret); 145 return ret; 146 } 147 return 0; 148 } 149 150 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 151 { 152 struct exynos_dp_device *dp = dev_get_drvdata(dev); 153 struct drm_encoder *encoder = &dp->encoder; 154 struct drm_device *drm_dev = data; 155 int ret; 156 157 dp->drm_dev = drm_dev; 158 159 if (!dp->plat_data.panel && !dp->ptn_bridge) { 160 ret = exynos_dp_dt_parse_panel(dp); 161 if (ret) 162 return ret; 163 } 164 165 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS); 166 167 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 168 169 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 170 if (ret < 0) 171 return ret; 172 173 dp->plat_data.encoder = encoder; 174 175 ret = analogix_dp_bind(dp->adp, dp->drm_dev); 176 if (ret) 177 dp->encoder.funcs->destroy(&dp->encoder); 178 179 return ret; 180 } 181 182 static void exynos_dp_unbind(struct device *dev, struct device *master, 183 void *data) 184 { 185 struct exynos_dp_device *dp = dev_get_drvdata(dev); 186 187 analogix_dp_unbind(dp->adp); 188 dp->encoder.funcs->destroy(&dp->encoder); 189 } 190 191 static const struct component_ops exynos_dp_ops = { 192 .bind = exynos_dp_bind, 193 .unbind = exynos_dp_unbind, 194 }; 195 196 static int exynos_dp_probe(struct platform_device *pdev) 197 { 198 struct device *dev = &pdev->dev; 199 struct device_node *np; 200 struct exynos_dp_device *dp; 201 struct drm_panel *panel; 202 struct drm_bridge *bridge; 203 int ret; 204 205 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 206 GFP_KERNEL); 207 if (!dp) 208 return -ENOMEM; 209 210 dp->dev = dev; 211 /* 212 * We just use the drvdata until driver run into component 213 * add function, and then we would set drvdata to null, so 214 * that analogix dp driver would take charge of the drvdata. 215 */ 216 platform_set_drvdata(pdev, dp); 217 218 /* This is for the backward compatibility. */ 219 np = of_parse_phandle(dev->of_node, "panel", 0); 220 if (np) { 221 dp->plat_data.panel = of_drm_find_panel(np); 222 223 of_node_put(np); 224 if (IS_ERR(dp->plat_data.panel)) 225 return PTR_ERR(dp->plat_data.panel); 226 227 goto out; 228 } 229 230 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 231 if (ret) 232 return ret; 233 234 /* The remote port can be either a panel or a bridge */ 235 dp->plat_data.panel = panel; 236 dp->plat_data.dev_type = EXYNOS_DP; 237 dp->plat_data.power_on_start = exynos_dp_poweron; 238 dp->plat_data.power_off = exynos_dp_poweroff; 239 dp->plat_data.attach = exynos_dp_bridge_attach; 240 dp->plat_data.get_modes = exynos_dp_get_modes; 241 dp->plat_data.skip_connector = !!bridge; 242 243 dp->ptn_bridge = bridge; 244 245 out: 246 dp->adp = analogix_dp_probe(dev, &dp->plat_data); 247 if (IS_ERR(dp->adp)) 248 return PTR_ERR(dp->adp); 249 250 return component_add(&pdev->dev, &exynos_dp_ops); 251 } 252 253 static int exynos_dp_remove(struct platform_device *pdev) 254 { 255 struct exynos_dp_device *dp = platform_get_drvdata(pdev); 256 257 component_del(&pdev->dev, &exynos_dp_ops); 258 analogix_dp_remove(dp->adp); 259 260 return 0; 261 } 262 263 static int exynos_dp_suspend(struct device *dev) 264 { 265 struct exynos_dp_device *dp = dev_get_drvdata(dev); 266 267 return analogix_dp_suspend(dp->adp); 268 } 269 270 static int exynos_dp_resume(struct device *dev) 271 { 272 struct exynos_dp_device *dp = dev_get_drvdata(dev); 273 274 return analogix_dp_resume(dp->adp); 275 } 276 277 static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend, 278 exynos_dp_resume, NULL); 279 280 static const struct of_device_id exynos_dp_match[] = { 281 { .compatible = "samsung,exynos5-dp" }, 282 {}, 283 }; 284 MODULE_DEVICE_TABLE(of, exynos_dp_match); 285 286 struct platform_driver dp_driver = { 287 .probe = exynos_dp_probe, 288 .remove = exynos_dp_remove, 289 .driver = { 290 .name = "exynos-dp", 291 .pm = pm_ptr(&exynos_dp_pm_ops), 292 .of_match_table = exynos_dp_match, 293 }, 294 }; 295 296 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 297 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 298 MODULE_LICENSE("GPL v2"); 299