1 /* 2 * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com> 3 * Copyright (C) 2017 Broadcom 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of 8 * the License, or (at your option) any later version. 9 */ 10 11 #include <drm/drmP.h> 12 #include <drm/drm_panel.h> 13 #include <drm/drm_atomic_helper.h> 14 #include <drm/drm_connector.h> 15 #include <drm/drm_crtc_helper.h> 16 #include <drm/drm_encoder.h> 17 #include <drm/drm_modeset_helper_vtables.h> 18 #include <drm/drm_panel.h> 19 20 struct panel_bridge { 21 struct drm_bridge bridge; 22 struct drm_connector connector; 23 struct drm_panel *panel; 24 u32 connector_type; 25 }; 26 27 static inline struct panel_bridge * 28 drm_bridge_to_panel_bridge(struct drm_bridge *bridge) 29 { 30 return container_of(bridge, struct panel_bridge, bridge); 31 } 32 33 static inline struct panel_bridge * 34 drm_connector_to_panel_bridge(struct drm_connector *connector) 35 { 36 return container_of(connector, struct panel_bridge, connector); 37 } 38 39 static int panel_bridge_connector_get_modes(struct drm_connector *connector) 40 { 41 struct panel_bridge *panel_bridge = 42 drm_connector_to_panel_bridge(connector); 43 44 return drm_panel_get_modes(panel_bridge->panel); 45 } 46 47 static const struct drm_connector_helper_funcs 48 panel_bridge_connector_helper_funcs = { 49 .get_modes = panel_bridge_connector_get_modes, 50 }; 51 52 static const struct drm_connector_funcs panel_bridge_connector_funcs = { 53 .reset = drm_atomic_helper_connector_reset, 54 .fill_modes = drm_helper_probe_single_connector_modes, 55 .destroy = drm_connector_cleanup, 56 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 57 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 58 }; 59 60 static int panel_bridge_attach(struct drm_bridge *bridge) 61 { 62 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 63 struct drm_connector *connector = &panel_bridge->connector; 64 int ret; 65 66 if (!bridge->encoder) { 67 DRM_ERROR("Missing encoder\n"); 68 return -ENODEV; 69 } 70 71 drm_connector_helper_add(connector, 72 &panel_bridge_connector_helper_funcs); 73 74 ret = drm_connector_init(bridge->dev, connector, 75 &panel_bridge_connector_funcs, 76 panel_bridge->connector_type); 77 if (ret) { 78 DRM_ERROR("Failed to initialize connector\n"); 79 return ret; 80 } 81 82 drm_connector_attach_encoder(&panel_bridge->connector, 83 bridge->encoder); 84 85 ret = drm_panel_attach(panel_bridge->panel, &panel_bridge->connector); 86 if (ret < 0) 87 return ret; 88 89 return 0; 90 } 91 92 static void panel_bridge_detach(struct drm_bridge *bridge) 93 { 94 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 95 96 drm_panel_detach(panel_bridge->panel); 97 } 98 99 static void panel_bridge_pre_enable(struct drm_bridge *bridge) 100 { 101 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 102 103 drm_panel_prepare(panel_bridge->panel); 104 } 105 106 static void panel_bridge_enable(struct drm_bridge *bridge) 107 { 108 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 109 110 drm_panel_enable(panel_bridge->panel); 111 } 112 113 static void panel_bridge_disable(struct drm_bridge *bridge) 114 { 115 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 116 117 drm_panel_disable(panel_bridge->panel); 118 } 119 120 static void panel_bridge_post_disable(struct drm_bridge *bridge) 121 { 122 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 123 124 drm_panel_unprepare(panel_bridge->panel); 125 } 126 127 static const struct drm_bridge_funcs panel_bridge_bridge_funcs = { 128 .attach = panel_bridge_attach, 129 .detach = panel_bridge_detach, 130 .pre_enable = panel_bridge_pre_enable, 131 .enable = panel_bridge_enable, 132 .disable = panel_bridge_disable, 133 .post_disable = panel_bridge_post_disable, 134 }; 135 136 /** 137 * drm_panel_bridge_add - Creates a drm_bridge and drm_connector that 138 * just calls the appropriate functions from drm_panel. 139 * 140 * @panel: The drm_panel being wrapped. Must be non-NULL. 141 * @connector_type: The DRM_MODE_CONNECTOR_* for the connector to be 142 * created. 143 * 144 * For drivers converting from directly using drm_panel: The expected 145 * usage pattern is that during either encoder module probe or DSI 146 * host attach, a drm_panel will be looked up through 147 * drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to 148 * wrap that panel in the new bridge, and the result can then be 149 * passed to drm_bridge_attach(). The drm_panel_prepare() and related 150 * functions can be dropped from the encoder driver (they're now 151 * called by the KMS helpers before calling into the encoder), along 152 * with connector creation. When done with the bridge, 153 * drm_bridge_detach() should be called as normal, then 154 * drm_panel_bridge_remove() to free it. 155 */ 156 struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel, 157 u32 connector_type) 158 { 159 struct panel_bridge *panel_bridge; 160 161 if (!panel) 162 return ERR_PTR(-EINVAL); 163 164 panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge), 165 GFP_KERNEL); 166 if (!panel_bridge) 167 return ERR_PTR(-ENOMEM); 168 169 panel_bridge->connector_type = connector_type; 170 panel_bridge->panel = panel; 171 172 panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs; 173 #ifdef CONFIG_OF 174 panel_bridge->bridge.of_node = panel->dev->of_node; 175 #endif 176 177 drm_bridge_add(&panel_bridge->bridge); 178 179 return &panel_bridge->bridge; 180 } 181 EXPORT_SYMBOL(drm_panel_bridge_add); 182 183 /** 184 * drm_panel_bridge_remove - Unregisters and frees a drm_bridge 185 * created by drm_panel_bridge_add(). 186 * 187 * @bridge: The drm_bridge being freed. 188 */ 189 void drm_panel_bridge_remove(struct drm_bridge *bridge) 190 { 191 struct panel_bridge *panel_bridge; 192 193 if (!bridge) 194 return; 195 196 if (bridge->funcs != &panel_bridge_bridge_funcs) 197 return; 198 199 panel_bridge = drm_bridge_to_panel_bridge(bridge); 200 201 drm_bridge_remove(bridge); 202 devm_kfree(panel_bridge->panel->dev, bridge); 203 } 204 EXPORT_SYMBOL(drm_panel_bridge_remove); 205 206 static void devm_drm_panel_bridge_release(struct device *dev, void *res) 207 { 208 struct drm_bridge **bridge = res; 209 210 drm_panel_bridge_remove(*bridge); 211 } 212 213 struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev, 214 struct drm_panel *panel, 215 u32 connector_type) 216 { 217 struct drm_bridge **ptr, *bridge; 218 219 ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr), 220 GFP_KERNEL); 221 if (!ptr) 222 return ERR_PTR(-ENOMEM); 223 224 bridge = drm_panel_bridge_add(panel, connector_type); 225 if (!IS_ERR(bridge)) { 226 *ptr = bridge; 227 devres_add(dev, ptr); 228 } else { 229 devres_free(ptr); 230 } 231 232 return bridge; 233 } 234 EXPORT_SYMBOL(devm_drm_panel_bridge_add); 235