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 78 if (dp->plat_data.panel) 79 return 0; 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 0; 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 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 return ret; 114 } 115 116 return 0; 117 } 118 119 static void exynos_dp_mode_set(struct drm_encoder *encoder, 120 struct drm_display_mode *mode, 121 struct drm_display_mode *adjusted_mode) 122 { 123 } 124 125 static void exynos_dp_nop(struct drm_encoder *encoder) 126 { 127 /* do nothing */ 128 } 129 130 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = { 131 .mode_set = exynos_dp_mode_set, 132 .enable = exynos_dp_nop, 133 .disable = exynos_dp_nop, 134 }; 135 136 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp) 137 { 138 int ret; 139 140 ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE); 141 if (ret) { 142 DRM_DEV_ERROR(dp->dev, 143 "failed: of_get_videomode() : %d\n", ret); 144 return ret; 145 } 146 return 0; 147 } 148 149 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 150 { 151 struct exynos_dp_device *dp = dev_get_drvdata(dev); 152 struct drm_encoder *encoder = &dp->encoder; 153 struct drm_device *drm_dev = data; 154 int ret; 155 156 dp->drm_dev = drm_dev; 157 158 if (!dp->plat_data.panel && !dp->ptn_bridge) { 159 ret = exynos_dp_dt_parse_panel(dp); 160 if (ret) 161 return ret; 162 } 163 164 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS); 165 166 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 167 168 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 169 if (ret < 0) 170 return ret; 171 172 dp->plat_data.encoder = encoder; 173 174 ret = analogix_dp_bind(dp->adp, dp->drm_dev); 175 if (ret) 176 dp->encoder.funcs->destroy(&dp->encoder); 177 178 return ret; 179 } 180 181 static void exynos_dp_unbind(struct device *dev, struct device *master, 182 void *data) 183 { 184 struct exynos_dp_device *dp = dev_get_drvdata(dev); 185 186 analogix_dp_unbind(dp->adp); 187 dp->encoder.funcs->destroy(&dp->encoder); 188 } 189 190 static const struct component_ops exynos_dp_ops = { 191 .bind = exynos_dp_bind, 192 .unbind = exynos_dp_unbind, 193 }; 194 195 static int exynos_dp_probe(struct platform_device *pdev) 196 { 197 struct device *dev = &pdev->dev; 198 struct device_node *np; 199 struct exynos_dp_device *dp; 200 struct drm_panel *panel; 201 struct drm_bridge *bridge; 202 int ret; 203 204 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 205 GFP_KERNEL); 206 if (!dp) 207 return -ENOMEM; 208 209 dp->dev = dev; 210 /* 211 * We just use the drvdata until driver run into component 212 * add function, and then we would set drvdata to null, so 213 * that analogix dp driver would take charge of the drvdata. 214 */ 215 platform_set_drvdata(pdev, dp); 216 217 /* This is for the backward compatibility. */ 218 np = of_parse_phandle(dev->of_node, "panel", 0); 219 if (np) { 220 dp->plat_data.panel = of_drm_find_panel(np); 221 222 of_node_put(np); 223 if (IS_ERR(dp->plat_data.panel)) 224 return PTR_ERR(dp->plat_data.panel); 225 226 goto out; 227 } 228 229 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge); 230 if (ret) 231 return ret; 232 233 /* The remote port can be either a panel or a bridge */ 234 dp->plat_data.panel = panel; 235 dp->plat_data.dev_type = EXYNOS_DP; 236 dp->plat_data.power_on = exynos_dp_poweron; 237 dp->plat_data.power_off = exynos_dp_poweroff; 238 dp->plat_data.attach = exynos_dp_bridge_attach; 239 dp->plat_data.get_modes = exynos_dp_get_modes; 240 dp->plat_data.skip_connector = !!bridge; 241 242 dp->ptn_bridge = bridge; 243 244 out: 245 dp->adp = analogix_dp_probe(dev, &dp->plat_data); 246 if (IS_ERR(dp->adp)) 247 return PTR_ERR(dp->adp); 248 249 return component_add(&pdev->dev, &exynos_dp_ops); 250 } 251 252 static void exynos_dp_remove(struct platform_device *pdev) 253 { 254 component_del(&pdev->dev, &exynos_dp_ops); 255 } 256 257 static int exynos_dp_suspend(struct device *dev) 258 { 259 struct exynos_dp_device *dp = dev_get_drvdata(dev); 260 261 return analogix_dp_suspend(dp->adp); 262 } 263 264 static int exynos_dp_resume(struct device *dev) 265 { 266 struct exynos_dp_device *dp = dev_get_drvdata(dev); 267 268 return analogix_dp_resume(dp->adp); 269 } 270 271 static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend, 272 exynos_dp_resume, NULL); 273 274 static const struct of_device_id exynos_dp_match[] = { 275 { .compatible = "samsung,exynos5-dp" }, 276 {}, 277 }; 278 MODULE_DEVICE_TABLE(of, exynos_dp_match); 279 280 struct platform_driver dp_driver = { 281 .probe = exynos_dp_probe, 282 .remove_new = exynos_dp_remove, 283 .driver = { 284 .name = "exynos-dp", 285 .pm = pm_ptr(&exynos_dp_pm_ops), 286 .of_match_table = exynos_dp_match, 287 }, 288 }; 289 290 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 291 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 292 MODULE_LICENSE("GPL v2"); 293