1 /* 2 * Copyright (C) 2012 Texas Instruments 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <linux/pinctrl/pinmux.h> 19 #include <linux/pinctrl/consumer.h> 20 #include <linux/backlight.h> 21 #include <video/display_timing.h> 22 #include <video/of_display_timing.h> 23 #include <video/videomode.h> 24 25 #include "tilcdc_drv.h" 26 27 struct panel_module { 28 struct tilcdc_module base; 29 struct tilcdc_panel_info *info; 30 struct display_timings *timings; 31 struct backlight_device *backlight; 32 }; 33 #define to_panel_module(x) container_of(x, struct panel_module, base) 34 35 36 /* 37 * Encoder: 38 */ 39 40 struct panel_encoder { 41 struct drm_encoder base; 42 struct panel_module *mod; 43 }; 44 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base) 45 46 47 static void panel_encoder_destroy(struct drm_encoder *encoder) 48 { 49 struct panel_encoder *panel_encoder = to_panel_encoder(encoder); 50 drm_encoder_cleanup(encoder); 51 kfree(panel_encoder); 52 } 53 54 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode) 55 { 56 struct panel_encoder *panel_encoder = to_panel_encoder(encoder); 57 struct backlight_device *backlight = panel_encoder->mod->backlight; 58 59 if (!backlight) 60 return; 61 62 backlight->props.power = mode == DRM_MODE_DPMS_ON 63 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; 64 backlight_update_status(backlight); 65 } 66 67 static bool panel_encoder_mode_fixup(struct drm_encoder *encoder, 68 const struct drm_display_mode *mode, 69 struct drm_display_mode *adjusted_mode) 70 { 71 /* nothing needed */ 72 return true; 73 } 74 75 static void panel_encoder_prepare(struct drm_encoder *encoder) 76 { 77 struct panel_encoder *panel_encoder = to_panel_encoder(encoder); 78 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); 79 tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info); 80 } 81 82 static void panel_encoder_commit(struct drm_encoder *encoder) 83 { 84 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON); 85 } 86 87 static void panel_encoder_mode_set(struct drm_encoder *encoder, 88 struct drm_display_mode *mode, 89 struct drm_display_mode *adjusted_mode) 90 { 91 /* nothing needed */ 92 } 93 94 static const struct drm_encoder_funcs panel_encoder_funcs = { 95 .destroy = panel_encoder_destroy, 96 }; 97 98 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = { 99 .dpms = panel_encoder_dpms, 100 .mode_fixup = panel_encoder_mode_fixup, 101 .prepare = panel_encoder_prepare, 102 .commit = panel_encoder_commit, 103 .mode_set = panel_encoder_mode_set, 104 }; 105 106 static struct drm_encoder *panel_encoder_create(struct drm_device *dev, 107 struct panel_module *mod) 108 { 109 struct panel_encoder *panel_encoder; 110 struct drm_encoder *encoder; 111 int ret; 112 113 panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL); 114 if (!panel_encoder) { 115 dev_err(dev->dev, "allocation failed\n"); 116 return NULL; 117 } 118 119 panel_encoder->mod = mod; 120 121 encoder = &panel_encoder->base; 122 encoder->possible_crtcs = 1; 123 124 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs, 125 DRM_MODE_ENCODER_LVDS); 126 if (ret < 0) 127 goto fail; 128 129 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs); 130 131 return encoder; 132 133 fail: 134 panel_encoder_destroy(encoder); 135 return NULL; 136 } 137 138 /* 139 * Connector: 140 */ 141 142 struct panel_connector { 143 struct drm_connector base; 144 145 struct drm_encoder *encoder; /* our connected encoder */ 146 struct panel_module *mod; 147 }; 148 #define to_panel_connector(x) container_of(x, struct panel_connector, base) 149 150 151 static void panel_connector_destroy(struct drm_connector *connector) 152 { 153 struct panel_connector *panel_connector = to_panel_connector(connector); 154 drm_connector_cleanup(connector); 155 kfree(panel_connector); 156 } 157 158 static enum drm_connector_status panel_connector_detect( 159 struct drm_connector *connector, 160 bool force) 161 { 162 return connector_status_connected; 163 } 164 165 static int panel_connector_get_modes(struct drm_connector *connector) 166 { 167 struct drm_device *dev = connector->dev; 168 struct panel_connector *panel_connector = to_panel_connector(connector); 169 struct display_timings *timings = panel_connector->mod->timings; 170 int i; 171 172 for (i = 0; i < timings->num_timings; i++) { 173 struct drm_display_mode *mode = drm_mode_create(dev); 174 struct videomode vm; 175 176 if (videomode_from_timings(timings, &vm, i)) 177 break; 178 179 drm_display_mode_from_videomode(&vm, mode); 180 181 mode->type = DRM_MODE_TYPE_DRIVER; 182 183 if (timings->native_mode == i) 184 mode->type |= DRM_MODE_TYPE_PREFERRED; 185 186 drm_mode_set_name(mode); 187 drm_mode_probed_add(connector, mode); 188 } 189 190 return i; 191 } 192 193 static int panel_connector_mode_valid(struct drm_connector *connector, 194 struct drm_display_mode *mode) 195 { 196 struct tilcdc_drm_private *priv = connector->dev->dev_private; 197 /* our only constraints are what the crtc can generate: */ 198 return tilcdc_crtc_mode_valid(priv->crtc, mode); 199 } 200 201 static struct drm_encoder *panel_connector_best_encoder( 202 struct drm_connector *connector) 203 { 204 struct panel_connector *panel_connector = to_panel_connector(connector); 205 return panel_connector->encoder; 206 } 207 208 static const struct drm_connector_funcs panel_connector_funcs = { 209 .destroy = panel_connector_destroy, 210 .dpms = drm_helper_connector_dpms, 211 .detect = panel_connector_detect, 212 .fill_modes = drm_helper_probe_single_connector_modes, 213 }; 214 215 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = { 216 .get_modes = panel_connector_get_modes, 217 .mode_valid = panel_connector_mode_valid, 218 .best_encoder = panel_connector_best_encoder, 219 }; 220 221 static struct drm_connector *panel_connector_create(struct drm_device *dev, 222 struct panel_module *mod, struct drm_encoder *encoder) 223 { 224 struct panel_connector *panel_connector; 225 struct drm_connector *connector; 226 int ret; 227 228 panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL); 229 if (!panel_connector) { 230 dev_err(dev->dev, "allocation failed\n"); 231 return NULL; 232 } 233 234 panel_connector->encoder = encoder; 235 panel_connector->mod = mod; 236 237 connector = &panel_connector->base; 238 239 drm_connector_init(dev, connector, &panel_connector_funcs, 240 DRM_MODE_CONNECTOR_LVDS); 241 drm_connector_helper_add(connector, &panel_connector_helper_funcs); 242 243 connector->interlace_allowed = 0; 244 connector->doublescan_allowed = 0; 245 246 ret = drm_mode_connector_attach_encoder(connector, encoder); 247 if (ret) 248 goto fail; 249 250 drm_sysfs_connector_add(connector); 251 252 return connector; 253 254 fail: 255 panel_connector_destroy(connector); 256 return NULL; 257 } 258 259 /* 260 * Module: 261 */ 262 263 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) 264 { 265 struct panel_module *panel_mod = to_panel_module(mod); 266 struct tilcdc_drm_private *priv = dev->dev_private; 267 struct drm_encoder *encoder; 268 struct drm_connector *connector; 269 270 encoder = panel_encoder_create(dev, panel_mod); 271 if (!encoder) 272 return -ENOMEM; 273 274 connector = panel_connector_create(dev, panel_mod, encoder); 275 if (!connector) 276 return -ENOMEM; 277 278 priv->encoders[priv->num_encoders++] = encoder; 279 priv->connectors[priv->num_connectors++] = connector; 280 281 return 0; 282 } 283 284 static void panel_destroy(struct tilcdc_module *mod) 285 { 286 struct panel_module *panel_mod = to_panel_module(mod); 287 288 if (panel_mod->timings) { 289 display_timings_release(panel_mod->timings); 290 kfree(panel_mod->timings); 291 } 292 293 tilcdc_module_cleanup(mod); 294 kfree(panel_mod->info); 295 kfree(panel_mod); 296 } 297 298 static const struct tilcdc_module_ops panel_module_ops = { 299 .modeset_init = panel_modeset_init, 300 .destroy = panel_destroy, 301 }; 302 303 /* 304 * Device: 305 */ 306 307 /* maybe move this somewhere common if it is needed by other outputs? */ 308 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) 309 { 310 struct device_node *info_np; 311 struct tilcdc_panel_info *info; 312 int ret = 0; 313 314 if (!np) { 315 pr_err("%s: no devicenode given\n", __func__); 316 return NULL; 317 } 318 319 info_np = of_get_child_by_name(np, "panel-info"); 320 if (!info_np) { 321 pr_err("%s: could not find panel-info node\n", __func__); 322 return NULL; 323 } 324 325 info = kzalloc(sizeof(*info), GFP_KERNEL); 326 if (!info) { 327 pr_err("%s: allocation failed\n", __func__); 328 return NULL; 329 } 330 331 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); 332 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); 333 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); 334 ret |= of_property_read_u32(info_np, "bpp", &info->bpp); 335 ret |= of_property_read_u32(info_np, "fdd", &info->fdd); 336 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); 337 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); 338 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); 339 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); 340 341 /* optional: */ 342 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); 343 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); 344 345 if (ret) { 346 pr_err("%s: error reading panel-info properties\n", __func__); 347 kfree(info); 348 return NULL; 349 } 350 351 return info; 352 } 353 354 static struct of_device_id panel_of_match[]; 355 356 static int panel_probe(struct platform_device *pdev) 357 { 358 struct device_node *node = pdev->dev.of_node; 359 struct panel_module *panel_mod; 360 struct tilcdc_module *mod; 361 struct pinctrl *pinctrl; 362 int ret = -EINVAL; 363 364 365 /* bail out early if no DT data: */ 366 if (!node) { 367 dev_err(&pdev->dev, "device-tree data is missing\n"); 368 return -ENXIO; 369 } 370 371 panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL); 372 if (!panel_mod) 373 return -ENOMEM; 374 375 mod = &panel_mod->base; 376 377 tilcdc_module_init(mod, "panel", &panel_module_ops); 378 379 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 380 if (IS_ERR(pinctrl)) 381 dev_warn(&pdev->dev, "pins are not configured\n"); 382 383 384 panel_mod->timings = of_get_display_timings(node); 385 if (!panel_mod->timings) { 386 dev_err(&pdev->dev, "could not get panel timings\n"); 387 goto fail; 388 } 389 390 panel_mod->info = of_get_panel_info(node); 391 if (!panel_mod->info) { 392 dev_err(&pdev->dev, "could not get panel info\n"); 393 goto fail; 394 } 395 396 mod->preferred_bpp = panel_mod->info->bpp; 397 398 panel_mod->backlight = of_find_backlight_by_node(node); 399 if (panel_mod->backlight) 400 dev_info(&pdev->dev, "found backlight\n"); 401 402 return 0; 403 404 fail: 405 panel_destroy(mod); 406 return ret; 407 } 408 409 static int panel_remove(struct platform_device *pdev) 410 { 411 return 0; 412 } 413 414 static struct of_device_id panel_of_match[] = { 415 { .compatible = "ti,tilcdc,panel", }, 416 { }, 417 }; 418 419 struct platform_driver panel_driver = { 420 .probe = panel_probe, 421 .remove = panel_remove, 422 .driver = { 423 .owner = THIS_MODULE, 424 .name = "panel", 425 .of_match_table = panel_of_match, 426 }, 427 }; 428 429 int __init tilcdc_panel_init(void) 430 { 431 return platform_driver_register(&panel_driver); 432 } 433 434 void __exit tilcdc_panel_fini(void) 435 { 436 platform_driver_unregister(&panel_driver); 437 } 438