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 output mode 31 */ 32 enum atmel_hlcdc_connector_rgb_mode { 33 ATMEL_HLCDC_CONNECTOR_RGB444, 34 ATMEL_HLCDC_CONNECTOR_RGB565, 35 ATMEL_HLCDC_CONNECTOR_RGB666, 36 ATMEL_HLCDC_CONNECTOR_RGB888, 37 }; 38 39 /** 40 * Atmel HLCDC RGB connector structure 41 * 42 * This structure stores RGB slave device information. 43 * 44 * @connector: DRM connector 45 * @encoder: DRM encoder 46 * @dc: pointer to the atmel_hlcdc_dc structure 47 * @dpms: current DPMS mode 48 */ 49 struct atmel_hlcdc_rgb_output { 50 struct drm_connector connector; 51 struct drm_encoder encoder; 52 struct atmel_hlcdc_dc *dc; 53 int dpms; 54 }; 55 56 static inline struct atmel_hlcdc_rgb_output * 57 drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector) 58 { 59 return container_of(connector, struct atmel_hlcdc_rgb_output, 60 connector); 61 } 62 63 static inline struct atmel_hlcdc_rgb_output * 64 drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder) 65 { 66 return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder); 67 } 68 69 /** 70 * Atmel HLCDC Panel device structure 71 * 72 * This structure is specialization of the slave device structure to 73 * interface with drm panels. 74 * 75 * @base: base slave device fields 76 * @panel: drm panel attached to this slave device 77 */ 78 struct atmel_hlcdc_panel { 79 struct atmel_hlcdc_rgb_output base; 80 struct drm_panel *panel; 81 }; 82 83 static inline struct atmel_hlcdc_panel * 84 atmel_hlcdc_rgb_output_to_panel(struct atmel_hlcdc_rgb_output *output) 85 { 86 return container_of(output, struct atmel_hlcdc_panel, base); 87 } 88 89 static void atmel_hlcdc_panel_encoder_enable(struct drm_encoder *encoder) 90 { 91 struct atmel_hlcdc_rgb_output *rgb = 92 drm_encoder_to_atmel_hlcdc_rgb_output(encoder); 93 struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb); 94 95 drm_panel_enable(panel->panel); 96 } 97 98 static void atmel_hlcdc_panel_encoder_disable(struct drm_encoder *encoder) 99 { 100 struct atmel_hlcdc_rgb_output *rgb = 101 drm_encoder_to_atmel_hlcdc_rgb_output(encoder); 102 struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb); 103 104 drm_panel_disable(panel->panel); 105 } 106 107 static bool 108 atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder, 109 const struct drm_display_mode *mode, 110 struct drm_display_mode *adjusted) 111 { 112 return true; 113 } 114 115 static void 116 atmel_hlcdc_rgb_encoder_mode_set(struct drm_encoder *encoder, 117 struct drm_display_mode *mode, 118 struct drm_display_mode *adjusted) 119 { 120 struct atmel_hlcdc_rgb_output *rgb = 121 drm_encoder_to_atmel_hlcdc_rgb_output(encoder); 122 struct drm_display_info *info = &rgb->connector.display_info; 123 unsigned int cfg; 124 125 cfg = 0; 126 127 if (info->num_bus_formats) { 128 switch (info->bus_formats[0]) { 129 case MEDIA_BUS_FMT_RGB666_1X18: 130 cfg |= ATMEL_HLCDC_CONNECTOR_RGB666 << 8; 131 break; 132 case MEDIA_BUS_FMT_RGB888_1X24: 133 cfg |= ATMEL_HLCDC_CONNECTOR_RGB888 << 8; 134 break; 135 default: 136 break; 137 } 138 } 139 140 regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5), 141 ATMEL_HLCDC_MODE_MASK, 142 cfg); 143 } 144 145 static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = { 146 .mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup, 147 .mode_set = atmel_hlcdc_rgb_encoder_mode_set, 148 .disable = atmel_hlcdc_panel_encoder_disable, 149 .enable = atmel_hlcdc_panel_encoder_enable, 150 }; 151 152 static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder) 153 { 154 drm_encoder_cleanup(encoder); 155 memset(encoder, 0, sizeof(*encoder)); 156 } 157 158 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = { 159 .destroy = atmel_hlcdc_rgb_encoder_destroy, 160 }; 161 162 static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector) 163 { 164 struct atmel_hlcdc_rgb_output *rgb = 165 drm_connector_to_atmel_hlcdc_rgb_output(connector); 166 struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb); 167 168 return panel->panel->funcs->get_modes(panel->panel); 169 } 170 171 static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector, 172 struct drm_display_mode *mode) 173 { 174 struct atmel_hlcdc_rgb_output *rgb = 175 drm_connector_to_atmel_hlcdc_rgb_output(connector); 176 177 return atmel_hlcdc_dc_mode_valid(rgb->dc, mode); 178 } 179 180 181 182 static struct drm_encoder * 183 atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector) 184 { 185 struct atmel_hlcdc_rgb_output *rgb = 186 drm_connector_to_atmel_hlcdc_rgb_output(connector); 187 188 return &rgb->encoder; 189 } 190 191 static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = { 192 .get_modes = atmel_hlcdc_panel_get_modes, 193 .mode_valid = atmel_hlcdc_rgb_mode_valid, 194 .best_encoder = atmel_hlcdc_rgb_best_encoder, 195 }; 196 197 static enum drm_connector_status 198 atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force) 199 { 200 return connector_status_connected; 201 } 202 203 static void 204 atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector) 205 { 206 struct atmel_hlcdc_rgb_output *rgb = 207 drm_connector_to_atmel_hlcdc_rgb_output(connector); 208 struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb); 209 210 drm_panel_detach(panel->panel); 211 drm_connector_cleanup(connector); 212 } 213 214 static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = { 215 .dpms = drm_atomic_helper_connector_dpms, 216 .detect = atmel_hlcdc_panel_connector_detect, 217 .fill_modes = drm_helper_probe_single_connector_modes, 218 .destroy = atmel_hlcdc_panel_connector_destroy, 219 .reset = drm_atomic_helper_connector_reset, 220 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 221 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 222 }; 223 224 static int atmel_hlcdc_create_panel_output(struct drm_device *dev, 225 struct of_endpoint *ep) 226 { 227 struct atmel_hlcdc_dc *dc = dev->dev_private; 228 struct device_node *np; 229 struct drm_panel *p = NULL; 230 struct atmel_hlcdc_panel *panel; 231 int ret; 232 233 np = of_graph_get_remote_port_parent(ep->local_node); 234 if (!np) 235 return -EINVAL; 236 237 p = of_drm_find_panel(np); 238 of_node_put(np); 239 240 if (!p) 241 return -EPROBE_DEFER; 242 243 panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL); 244 if (!panel) 245 return -EINVAL; 246 247 panel->base.dpms = DRM_MODE_DPMS_OFF; 248 249 panel->base.dc = dc; 250 251 drm_encoder_helper_add(&panel->base.encoder, 252 &atmel_hlcdc_panel_encoder_helper_funcs); 253 ret = drm_encoder_init(dev, &panel->base.encoder, 254 &atmel_hlcdc_panel_encoder_funcs, 255 DRM_MODE_ENCODER_LVDS); 256 if (ret) 257 return ret; 258 259 panel->base.connector.dpms = DRM_MODE_DPMS_OFF; 260 panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT; 261 drm_connector_helper_add(&panel->base.connector, 262 &atmel_hlcdc_panel_connector_helper_funcs); 263 ret = drm_connector_init(dev, &panel->base.connector, 264 &atmel_hlcdc_panel_connector_funcs, 265 DRM_MODE_CONNECTOR_LVDS); 266 if (ret) 267 goto err_encoder_cleanup; 268 269 drm_mode_connector_attach_encoder(&panel->base.connector, 270 &panel->base.encoder); 271 panel->base.encoder.possible_crtcs = 0x1; 272 273 drm_panel_attach(p, &panel->base.connector); 274 panel->panel = p; 275 276 return 0; 277 278 err_encoder_cleanup: 279 drm_encoder_cleanup(&panel->base.encoder); 280 281 return ret; 282 } 283 284 int atmel_hlcdc_create_outputs(struct drm_device *dev) 285 { 286 struct device_node *port_np, *np; 287 struct of_endpoint ep; 288 int ret; 289 290 port_np = of_get_child_by_name(dev->dev->of_node, "port"); 291 if (!port_np) 292 return -EINVAL; 293 294 np = of_get_child_by_name(port_np, "endpoint"); 295 of_node_put(port_np); 296 297 if (!np) 298 return -EINVAL; 299 300 ret = of_graph_parse_endpoint(np, &ep); 301 of_node_put(port_np); 302 303 if (ret) 304 return ret; 305 306 /* We currently only support panel output */ 307 return atmel_hlcdc_create_panel_output(dev, &ep); 308 } 309