1 /* 2 * Copyright (C) 2014 Traphandler 3 * Copyright (C) 2014 Free Electrons 4 * Copyright (C) 2014 Atmel 5 * 6 * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com> 7 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License version 2 as published by 11 * the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but WITHOUT 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 16 * more details. 17 * 18 * You should have received a copy of the GNU General Public License along with 19 * this program. If not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include <linux/of_graph.h> 23 24 #include <drm/drmP.h> 25 #include <drm/drm_panel.h> 26 27 #include "atmel_hlcdc_dc.h" 28 29 /** 30 * Atmel HLCDC RGB connector structure 31 * 32 * This structure stores RGB slave device information. 33 * 34 * @connector: DRM connector 35 * @encoder: DRM encoder 36 * @dc: pointer to the atmel_hlcdc_dc structure 37 * @panel: panel connected on the RGB output 38 */ 39 struct atmel_hlcdc_rgb_output { 40 struct drm_connector connector; 41 struct drm_encoder encoder; 42 struct atmel_hlcdc_dc *dc; 43 struct drm_panel *panel; 44 }; 45 46 static inline struct atmel_hlcdc_rgb_output * 47 drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector) 48 { 49 return container_of(connector, struct atmel_hlcdc_rgb_output, 50 connector); 51 } 52 53 static inline struct atmel_hlcdc_rgb_output * 54 drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder) 55 { 56 return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder); 57 } 58 59 static void atmel_hlcdc_rgb_encoder_enable(struct drm_encoder *encoder) 60 { 61 struct atmel_hlcdc_rgb_output *rgb = 62 drm_encoder_to_atmel_hlcdc_rgb_output(encoder); 63 64 if (rgb->panel) { 65 drm_panel_prepare(rgb->panel); 66 drm_panel_enable(rgb->panel); 67 } 68 } 69 70 static void atmel_hlcdc_rgb_encoder_disable(struct drm_encoder *encoder) 71 { 72 struct atmel_hlcdc_rgb_output *rgb = 73 drm_encoder_to_atmel_hlcdc_rgb_output(encoder); 74 75 if (rgb->panel) { 76 drm_panel_disable(rgb->panel); 77 drm_panel_unprepare(rgb->panel); 78 } 79 } 80 81 static const struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = { 82 .disable = atmel_hlcdc_rgb_encoder_disable, 83 .enable = atmel_hlcdc_rgb_encoder_enable, 84 }; 85 86 static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder) 87 { 88 drm_encoder_cleanup(encoder); 89 memset(encoder, 0, sizeof(*encoder)); 90 } 91 92 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = { 93 .destroy = atmel_hlcdc_rgb_encoder_destroy, 94 }; 95 96 static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector) 97 { 98 struct atmel_hlcdc_rgb_output *rgb = 99 drm_connector_to_atmel_hlcdc_rgb_output(connector); 100 101 if (rgb->panel) 102 return rgb->panel->funcs->get_modes(rgb->panel); 103 104 return 0; 105 } 106 107 static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector, 108 struct drm_display_mode *mode) 109 { 110 struct atmel_hlcdc_rgb_output *rgb = 111 drm_connector_to_atmel_hlcdc_rgb_output(connector); 112 113 return atmel_hlcdc_dc_mode_valid(rgb->dc, mode); 114 } 115 116 static const struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = { 117 .get_modes = atmel_hlcdc_panel_get_modes, 118 .mode_valid = atmel_hlcdc_rgb_mode_valid, 119 }; 120 121 static enum drm_connector_status 122 atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force) 123 { 124 struct atmel_hlcdc_rgb_output *rgb = 125 drm_connector_to_atmel_hlcdc_rgb_output(connector); 126 127 if (rgb->panel) 128 return connector_status_connected; 129 130 return connector_status_disconnected; 131 } 132 133 static void 134 atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector) 135 { 136 struct atmel_hlcdc_rgb_output *rgb = 137 drm_connector_to_atmel_hlcdc_rgb_output(connector); 138 139 if (rgb->panel) 140 drm_panel_detach(rgb->panel); 141 142 drm_connector_cleanup(connector); 143 } 144 145 static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = { 146 .dpms = drm_atomic_helper_connector_dpms, 147 .detect = atmel_hlcdc_panel_connector_detect, 148 .fill_modes = drm_helper_probe_single_connector_modes, 149 .destroy = atmel_hlcdc_panel_connector_destroy, 150 .reset = drm_atomic_helper_connector_reset, 151 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 152 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 153 }; 154 155 static int atmel_hlcdc_check_endpoint(struct drm_device *dev, 156 const struct of_endpoint *ep) 157 { 158 struct device_node *np; 159 void *obj; 160 161 np = of_graph_get_remote_port_parent(ep->local_node); 162 163 obj = of_drm_find_panel(np); 164 if (!obj) 165 obj = of_drm_find_bridge(np); 166 167 of_node_put(np); 168 169 return obj ? 0 : -EPROBE_DEFER; 170 } 171 172 static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, 173 const struct of_endpoint *ep) 174 { 175 struct atmel_hlcdc_dc *dc = dev->dev_private; 176 struct atmel_hlcdc_rgb_output *output; 177 struct device_node *np; 178 struct drm_panel *panel; 179 struct drm_bridge *bridge; 180 int ret; 181 182 output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL); 183 if (!output) 184 return -EINVAL; 185 186 output->dc = dc; 187 188 drm_encoder_helper_add(&output->encoder, 189 &atmel_hlcdc_panel_encoder_helper_funcs); 190 ret = drm_encoder_init(dev, &output->encoder, 191 &atmel_hlcdc_panel_encoder_funcs, 192 DRM_MODE_ENCODER_NONE, NULL); 193 if (ret) 194 return ret; 195 196 output->encoder.possible_crtcs = 0x1; 197 198 np = of_graph_get_remote_port_parent(ep->local_node); 199 200 ret = -EPROBE_DEFER; 201 202 panel = of_drm_find_panel(np); 203 if (panel) { 204 of_node_put(np); 205 output->connector.dpms = DRM_MODE_DPMS_OFF; 206 output->connector.polled = DRM_CONNECTOR_POLL_CONNECT; 207 drm_connector_helper_add(&output->connector, 208 &atmel_hlcdc_panel_connector_helper_funcs); 209 ret = drm_connector_init(dev, &output->connector, 210 &atmel_hlcdc_panel_connector_funcs, 211 DRM_MODE_CONNECTOR_Unknown); 212 if (ret) 213 goto err_encoder_cleanup; 214 215 drm_mode_connector_attach_encoder(&output->connector, 216 &output->encoder); 217 218 ret = drm_panel_attach(panel, &output->connector); 219 if (ret) { 220 drm_connector_cleanup(&output->connector); 221 goto err_encoder_cleanup; 222 } 223 224 output->panel = panel; 225 226 return 0; 227 } 228 229 bridge = of_drm_find_bridge(np); 230 of_node_put(np); 231 232 if (bridge) { 233 ret = drm_bridge_attach(&output->encoder, bridge, NULL); 234 if (!ret) 235 return 0; 236 } 237 238 err_encoder_cleanup: 239 drm_encoder_cleanup(&output->encoder); 240 241 return ret; 242 } 243 244 int atmel_hlcdc_create_outputs(struct drm_device *dev) 245 { 246 struct device_node *ep_np = NULL; 247 struct of_endpoint ep; 248 int ret; 249 250 for_each_endpoint_of_node(dev->dev->of_node, ep_np) { 251 ret = of_graph_parse_endpoint(ep_np, &ep); 252 if (!ret) 253 ret = atmel_hlcdc_check_endpoint(dev, &ep); 254 255 if (ret) { 256 of_node_put(ep_np); 257 return ret; 258 } 259 } 260 261 for_each_endpoint_of_node(dev->dev->of_node, ep_np) { 262 ret = of_graph_parse_endpoint(ep_np, &ep); 263 if (!ret) 264 ret = atmel_hlcdc_attach_endpoint(dev, &ep); 265 266 if (ret) { 267 of_node_put(ep_np); 268 return ret; 269 } 270 } 271 272 return 0; 273 } 274