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_of.h> 28 #include <drm/drm_panel.h> 29 #include <drm/drm_print.h> 30 #include <drm/drm_probe_helper.h> 31 #include <drm/drm_simple_kms_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_helper_funcs exynos_dp_encoder_helper_funcs = { 83 .mode_set = exynos_dp_mode_set, 84 .enable = exynos_dp_nop, 85 .disable = exynos_dp_nop, 86 }; 87 88 static int exynos_dp_bind(struct device *dev, struct device *master, void *data) 89 { 90 struct exynos_dp_device *dp = dev_get_drvdata(dev); 91 struct drm_encoder *encoder = &dp->encoder; 92 struct drm_device *drm_dev = data; 93 struct drm_connector *connector; 94 int ret; 95 96 dp->drm_dev = drm_dev; 97 98 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS); 99 100 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); 101 102 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD); 103 if (ret < 0) 104 return ret; 105 106 dp->plat_data.encoder = encoder; 107 108 ret = analogix_dp_bind(dp->adp, dp->drm_dev); 109 if (ret) { 110 dp->encoder.funcs->destroy(&dp->encoder); 111 return ret; 112 } 113 114 connector = drm_bridge_connector_init(dp->drm_dev, dp->plat_data.encoder); 115 if (IS_ERR(connector)) { 116 ret = PTR_ERR(connector); 117 dev_err(dp->dev, "Failed to initialize bridge_connector\n"); 118 return ret; 119 } 120 121 return 0; 122 } 123 124 static void exynos_dp_unbind(struct device *dev, struct device *master, 125 void *data) 126 { 127 struct exynos_dp_device *dp = dev_get_drvdata(dev); 128 129 analogix_dp_unbind(dp->adp); 130 dp->encoder.funcs->destroy(&dp->encoder); 131 } 132 133 static const struct component_ops exynos_dp_ops = { 134 .bind = exynos_dp_bind, 135 .unbind = exynos_dp_unbind, 136 }; 137 138 static int exynos_dp_probe(struct platform_device *pdev) 139 { 140 struct device *dev = &pdev->dev; 141 struct device_node *np; 142 struct exynos_dp_device *dp; 143 144 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), 145 GFP_KERNEL); 146 if (!dp) 147 return -ENOMEM; 148 149 dp->dev = dev; 150 /* 151 * We just use the drvdata until driver run into component 152 * add function, and then we would set drvdata to null, so 153 * that analogix dp driver would take charge of the drvdata. 154 */ 155 platform_set_drvdata(pdev, dp); 156 157 /* This is for the backward compatibility. */ 158 np = of_parse_phandle(dev->of_node, "panel", 0); 159 if (np) { 160 dp->plat_data.panel = of_drm_find_panel(np); 161 162 of_node_put(np); 163 if (IS_ERR(dp->plat_data.panel)) 164 return PTR_ERR(dp->plat_data.panel); 165 166 goto out; 167 } 168 169 if (of_get_display_timings(dev->of_node)) { 170 dp->plat_data.next_bridge = devm_drm_of_display_mode_bridge(dp->dev, 171 dp->dev->of_node, 172 DRM_MODE_CONNECTOR_eDP); 173 if (IS_ERR(dp->plat_data.next_bridge)) 174 return PTR_ERR(dp->plat_data.next_bridge); 175 } 176 177 /* The remote port can be either a panel or a bridge */ 178 dp->plat_data.dev_type = EXYNOS_DP; 179 dp->plat_data.power_on = exynos_dp_poweron; 180 dp->plat_data.power_off = exynos_dp_poweroff; 181 dp->plat_data.ops = &exynos_dp_ops; 182 183 out: 184 dp->adp = analogix_dp_probe(dev, &dp->plat_data); 185 if (IS_ERR(dp->adp)) 186 return PTR_ERR(dp->adp); 187 188 if (dp->plat_data.panel || dp->plat_data.next_bridge) 189 return component_add(&pdev->dev, &exynos_dp_ops); 190 else 191 return analogix_dp_finish_probe(dp->adp); 192 } 193 194 static void exynos_dp_remove(struct platform_device *pdev) 195 { 196 component_del(&pdev->dev, &exynos_dp_ops); 197 } 198 199 static int exynos_dp_suspend(struct device *dev) 200 { 201 struct exynos_dp_device *dp = dev_get_drvdata(dev); 202 203 return analogix_dp_suspend(dp->adp); 204 } 205 206 static int exynos_dp_resume(struct device *dev) 207 { 208 struct exynos_dp_device *dp = dev_get_drvdata(dev); 209 210 return analogix_dp_resume(dp->adp); 211 } 212 213 static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend, 214 exynos_dp_resume, NULL); 215 216 static const struct of_device_id exynos_dp_match[] = { 217 { .compatible = "samsung,exynos5-dp" }, 218 {}, 219 }; 220 MODULE_DEVICE_TABLE(of, exynos_dp_match); 221 222 struct platform_driver dp_driver = { 223 .probe = exynos_dp_probe, 224 .remove = exynos_dp_remove, 225 .driver = { 226 .name = "exynos-dp", 227 .pm = pm_ptr(&exynos_dp_pm_ops), 228 .of_match_table = exynos_dp_match, 229 }, 230 }; 231 232 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 233 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension"); 234 MODULE_LICENSE("GPL v2"); 235