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/bridge/of-display-mode-bridge.h> 23 #include <drm/drm_atomic_helper.h> 24 #include <drm/drm_bridge.h> 25 #include <drm/drm_bridge_connector.h> 26 #include <drm/drm_crtc.h> 27 #include <drm/drm_encoder.h> 28 #include <drm/drm_of.h> 29 #include <drm/drm_panel.h> 30 #include <drm/drm_print.h> 31 #include <drm/drm_probe_helper.h> 32 #include <drm/exynos_drm.h> 33 34 #include "exynos_drm_crtc.h" 35 36 #define to_dp(nm) container_of(nm, struct exynos_dp_device, nm) 37 38 struct exynos_dp_device { 39 struct drm_encoder encoder; 40 struct drm_device *drm_dev; 41 struct device *dev; 42 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 void exynos_dp_mode_set(struct drm_encoder *encoder, 72 struct drm_display_mode *mode, 73 struct drm_display_mode *adjusted_mode) 74 { 75 } 76 77 static void exynos_dp_nop(struct drm_encoder *encoder) 78 { 79 /* do nothing */ 80 } 81 82 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = { 83 .destroy = drm_encoder_cleanup, 84 }; 85 86 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = { 87 .mode_set = exynos_dp_mode_set, 88 .enable = exynos_dp_nop, 89 .disable = exynos_dp_nop, 90 }; 91 92 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 93 { 94 struct exynos_dp_device *dp = dev_get_drvdata(dev); 95 struct drm_encoder *encoder = &dp->encoder; 96 struct drm_device *drm_dev = data; 97 struct drm_connector *connector; 98 int ret; 99 100 dp->drm_dev = drm_dev; 101 102 ret = drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, 103 DRM_MODE_ENCODER_TMDS, NULL); 104 if (ret) { 105 dev_err(dp->dev, "Failed to initialize encoder\n"); 106 return ret; 107 } 108 109 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 110 111 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 112 if (ret < 0) 113 return ret; 114 115 dp->plat_data.encoder = encoder; 116 117 ret = analogix_dp_bind(dp->adp, dp->drm_dev); 118 if (ret) { 119 dp->encoder.funcs->destroy(&dp->encoder); 120 return ret; 121 } 122 123 connector = drm_bridge_connector_init(dp->drm_dev, dp->plat_data.encoder); 124 if (IS_ERR(connector)) { 125 ret = PTR_ERR(connector); 126 dev_err(dp->dev, "Failed to initialize bridge_connector\n"); 127 return ret; 128 } 129 130 return 0; 131 } 132 133 static void exynos_dp_unbind(struct device *dev, struct device *master, 134 void *data) 135 { 136 struct exynos_dp_device *dp = dev_get_drvdata(dev); 137 138 analogix_dp_unbind(dp->adp); 139 dp->encoder.funcs->destroy(&dp->encoder); 140 } 141 142 static const struct component_ops exynos_dp_ops = { 143 .bind = exynos_dp_bind, 144 .unbind = exynos_dp_unbind, 145 }; 146 147 static int exynos_dp_probe(struct platform_device *pdev) 148 { 149 struct device *dev = &pdev->dev; 150 struct device_node *np; 151 struct exynos_dp_device *dp; 152 153 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 154 GFP_KERNEL); 155 if (!dp) 156 return -ENOMEM; 157 158 dp->dev = dev; 159 /* 160 * We just use the drvdata until driver run into component 161 * add function, and then we would set drvdata to null, so 162 * that analogix dp driver would take charge of the drvdata. 163 */ 164 platform_set_drvdata(pdev, dp); 165 166 /* This is for the backward compatibility. */ 167 np = of_parse_phandle(dev->of_node, "panel", 0); 168 if (np) { 169 dp->plat_data.panel = of_drm_find_panel(np); 170 171 of_node_put(np); 172 if (IS_ERR(dp->plat_data.panel)) 173 return PTR_ERR(dp->plat_data.panel); 174 175 goto out; 176 } 177 178 if (of_get_display_timings(dev->of_node)) { 179 dp->plat_data.next_bridge = devm_drm_of_display_mode_bridge(dp->dev, 180 dp->dev->of_node, 181 DRM_MODE_CONNECTOR_eDP); 182 if (IS_ERR(dp->plat_data.next_bridge)) 183 return PTR_ERR(dp->plat_data.next_bridge); 184 } 185 186 /* The remote port can be either a panel or a bridge */ 187 dp->plat_data.dev_type = EXYNOS_DP; 188 dp->plat_data.power_on = exynos_dp_poweron; 189 dp->plat_data.power_off = exynos_dp_poweroff; 190 dp->plat_data.ops = &exynos_dp_ops; 191 192 out: 193 dp->adp = analogix_dp_probe(dev, &dp->plat_data); 194 if (IS_ERR(dp->adp)) { 195 /* 196 * The driver core does not invoke remove() for failed probes, 197 * so release the probe-time panel reference here. 198 */ 199 if (dp->plat_data.panel) 200 drm_panel_put(dp->plat_data.panel); 201 return PTR_ERR(dp->adp); 202 } 203 204 if (dp->plat_data.panel || dp->plat_data.next_bridge) 205 return component_add(&pdev->dev, &exynos_dp_ops); 206 else 207 return analogix_dp_finish_probe(dp->adp); 208 } 209 210 static void exynos_dp_remove(struct platform_device *pdev) 211 { 212 struct exynos_dp_device *dp = platform_get_drvdata(pdev); 213 214 /* 215 * Release the probe-time reference from of_drm_find_panel(). If bind 216 * ran, the panel_bridge holds a second reference that devm cleanup 217 * will release when the bridge is destroyed after remove() returns. 218 */ 219 if (dp->plat_data.panel) 220 drm_panel_put(dp->plat_data.panel); 221 222 component_del(&pdev->dev, &exynos_dp_ops); 223 } 224 225 static int exynos_dp_suspend(struct device *dev) 226 { 227 struct exynos_dp_device *dp = dev_get_drvdata(dev); 228 229 return analogix_dp_suspend(dp->adp); 230 } 231 232 static int exynos_dp_resume(struct device *dev) 233 { 234 struct exynos_dp_device *dp = dev_get_drvdata(dev); 235 236 return analogix_dp_resume(dp->adp); 237 } 238 239 static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend, 240 exynos_dp_resume, NULL); 241 242 static const struct of_device_id exynos_dp_match[] = { 243 { .compatible = "samsung,exynos5-dp" }, 244 {}, 245 }; 246 MODULE_DEVICE_TABLE(of, exynos_dp_match); 247 248 struct platform_driver dp_driver = { 249 .probe = exynos_dp_probe, 250 .remove = exynos_dp_remove, 251 .driver = { 252 .name = "exynos-dp", 253 .pm = pm_ptr(&exynos_dp_pm_ops), 254 .of_match_table = exynos_dp_match, 255 }, 256 }; 257 258 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 259 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 260 MODULE_LICENSE("GPL v2"); 261