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 <linux/gpio/consumer.h> 22 #include <video/display_timing.h> 23 #include <video/of_display_timing.h> 24 #include <video/videomode.h> 25 #include <drm/drm_atomic_helper.h> 26 27 #include "tilcdc_drv.h" 28 #include "tilcdc_panel.h" 29 30 struct panel_module { 31 struct tilcdc_module base; 32 struct tilcdc_panel_info *info; 33 struct display_timings *timings; 34 struct backlight_device *backlight; 35 struct gpio_desc *enable_gpio; 36 }; 37 #define to_panel_module(x) container_of(x, struct panel_module, base) 38 39 40 /* 41 * Encoder: 42 */ 43 44 struct panel_encoder { 45 struct drm_encoder base; 46 struct panel_module *mod; 47 }; 48 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base) 49 50 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode) 51 { 52 struct panel_encoder *panel_encoder = to_panel_encoder(encoder); 53 struct backlight_device *backlight = panel_encoder->mod->backlight; 54 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio; 55 56 if (backlight) { 57 backlight->props.power = mode == DRM_MODE_DPMS_ON ? 58 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; 59 backlight_update_status(backlight); 60 } 61 62 if (gpio) 63 gpiod_set_value_cansleep(gpio, 64 mode == DRM_MODE_DPMS_ON ? 1 : 0); 65 } 66 67 static void panel_encoder_prepare(struct drm_encoder *encoder) 68 { 69 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); 70 } 71 72 static void panel_encoder_commit(struct drm_encoder *encoder) 73 { 74 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON); 75 } 76 77 static void panel_encoder_mode_set(struct drm_encoder *encoder, 78 struct drm_display_mode *mode, 79 struct drm_display_mode *adjusted_mode) 80 { 81 /* nothing needed */ 82 } 83 84 static const struct drm_encoder_funcs panel_encoder_funcs = { 85 .destroy = drm_encoder_cleanup, 86 }; 87 88 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = { 89 .dpms = panel_encoder_dpms, 90 .prepare = panel_encoder_prepare, 91 .commit = panel_encoder_commit, 92 .mode_set = panel_encoder_mode_set, 93 }; 94 95 static struct drm_encoder *panel_encoder_create(struct drm_device *dev, 96 struct panel_module *mod) 97 { 98 struct panel_encoder *panel_encoder; 99 struct drm_encoder *encoder; 100 int ret; 101 102 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder), 103 GFP_KERNEL); 104 if (!panel_encoder) { 105 dev_err(dev->dev, "allocation failed\n"); 106 return NULL; 107 } 108 109 panel_encoder->mod = mod; 110 111 encoder = &panel_encoder->base; 112 encoder->possible_crtcs = 1; 113 114 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs, 115 DRM_MODE_ENCODER_LVDS, NULL); 116 if (ret < 0) 117 goto fail; 118 119 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs); 120 121 return encoder; 122 123 fail: 124 drm_encoder_cleanup(encoder); 125 return NULL; 126 } 127 128 /* 129 * Connector: 130 */ 131 132 struct panel_connector { 133 struct drm_connector base; 134 135 struct drm_encoder *encoder; /* our connected encoder */ 136 struct panel_module *mod; 137 }; 138 #define to_panel_connector(x) container_of(x, struct panel_connector, base) 139 140 141 static void panel_connector_destroy(struct drm_connector *connector) 142 { 143 drm_connector_unregister(connector); 144 drm_connector_cleanup(connector); 145 } 146 147 static enum drm_connector_status panel_connector_detect( 148 struct drm_connector *connector, 149 bool force) 150 { 151 return connector_status_connected; 152 } 153 154 static int panel_connector_get_modes(struct drm_connector *connector) 155 { 156 struct drm_device *dev = connector->dev; 157 struct panel_connector *panel_connector = to_panel_connector(connector); 158 struct display_timings *timings = panel_connector->mod->timings; 159 int i; 160 161 for (i = 0; i < timings->num_timings; i++) { 162 struct drm_display_mode *mode = drm_mode_create(dev); 163 struct videomode vm; 164 165 if (videomode_from_timings(timings, &vm, i)) 166 break; 167 168 drm_display_mode_from_videomode(&vm, mode); 169 170 mode->type = DRM_MODE_TYPE_DRIVER; 171 172 if (timings->native_mode == i) 173 mode->type |= DRM_MODE_TYPE_PREFERRED; 174 175 drm_mode_set_name(mode); 176 drm_mode_probed_add(connector, mode); 177 } 178 179 return i; 180 } 181 182 static int panel_connector_mode_valid(struct drm_connector *connector, 183 struct drm_display_mode *mode) 184 { 185 struct tilcdc_drm_private *priv = connector->dev->dev_private; 186 /* our only constraints are what the crtc can generate: */ 187 return tilcdc_crtc_mode_valid(priv->crtc, mode); 188 } 189 190 static struct drm_encoder *panel_connector_best_encoder( 191 struct drm_connector *connector) 192 { 193 struct panel_connector *panel_connector = to_panel_connector(connector); 194 return panel_connector->encoder; 195 } 196 197 static const struct drm_connector_funcs panel_connector_funcs = { 198 .destroy = panel_connector_destroy, 199 .dpms = drm_atomic_helper_connector_dpms, 200 .detect = panel_connector_detect, 201 .fill_modes = drm_helper_probe_single_connector_modes, 202 .reset = drm_atomic_helper_connector_reset, 203 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 204 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 205 }; 206 207 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = { 208 .get_modes = panel_connector_get_modes, 209 .mode_valid = panel_connector_mode_valid, 210 .best_encoder = panel_connector_best_encoder, 211 }; 212 213 static struct drm_connector *panel_connector_create(struct drm_device *dev, 214 struct panel_module *mod, struct drm_encoder *encoder) 215 { 216 struct panel_connector *panel_connector; 217 struct drm_connector *connector; 218 int ret; 219 220 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector), 221 GFP_KERNEL); 222 if (!panel_connector) { 223 dev_err(dev->dev, "allocation failed\n"); 224 return NULL; 225 } 226 227 panel_connector->encoder = encoder; 228 panel_connector->mod = mod; 229 230 connector = &panel_connector->base; 231 232 drm_connector_init(dev, connector, &panel_connector_funcs, 233 DRM_MODE_CONNECTOR_LVDS); 234 drm_connector_helper_add(connector, &panel_connector_helper_funcs); 235 236 connector->interlace_allowed = 0; 237 connector->doublescan_allowed = 0; 238 239 ret = drm_mode_connector_attach_encoder(connector, encoder); 240 if (ret) 241 goto fail; 242 243 drm_connector_register(connector); 244 245 return connector; 246 247 fail: 248 panel_connector_destroy(connector); 249 return NULL; 250 } 251 252 /* 253 * Module: 254 */ 255 256 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) 257 { 258 struct panel_module *panel_mod = to_panel_module(mod); 259 struct tilcdc_drm_private *priv = dev->dev_private; 260 struct drm_encoder *encoder; 261 struct drm_connector *connector; 262 263 encoder = panel_encoder_create(dev, panel_mod); 264 if (!encoder) 265 return -ENOMEM; 266 267 connector = panel_connector_create(dev, panel_mod, encoder); 268 if (!connector) 269 return -ENOMEM; 270 271 priv->encoders[priv->num_encoders++] = encoder; 272 priv->connectors[priv->num_connectors++] = connector; 273 274 tilcdc_crtc_set_panel_info(priv->crtc, 275 to_panel_encoder(encoder)->mod->info); 276 277 return 0; 278 } 279 280 static const struct tilcdc_module_ops panel_module_ops = { 281 .modeset_init = panel_modeset_init, 282 }; 283 284 /* 285 * Device: 286 */ 287 288 /* maybe move this somewhere common if it is needed by other outputs? */ 289 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) 290 { 291 struct device_node *info_np; 292 struct tilcdc_panel_info *info; 293 int ret = 0; 294 295 if (!np) { 296 pr_err("%s: no devicenode given\n", __func__); 297 return NULL; 298 } 299 300 info_np = of_get_child_by_name(np, "panel-info"); 301 if (!info_np) { 302 pr_err("%s: could not find panel-info node\n", __func__); 303 return NULL; 304 } 305 306 info = kzalloc(sizeof(*info), GFP_KERNEL); 307 if (!info) { 308 pr_err("%s: allocation failed\n", __func__); 309 of_node_put(info_np); 310 return NULL; 311 } 312 313 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); 314 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); 315 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); 316 ret |= of_property_read_u32(info_np, "bpp", &info->bpp); 317 ret |= of_property_read_u32(info_np, "fdd", &info->fdd); 318 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); 319 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); 320 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); 321 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); 322 323 /* optional: */ 324 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); 325 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); 326 327 if (ret) { 328 pr_err("%s: error reading panel-info properties\n", __func__); 329 kfree(info); 330 of_node_put(info_np); 331 return NULL; 332 } 333 of_node_put(info_np); 334 335 return info; 336 } 337 338 static int panel_probe(struct platform_device *pdev) 339 { 340 struct device_node *bl_node, *node = pdev->dev.of_node; 341 struct panel_module *panel_mod; 342 struct tilcdc_module *mod; 343 struct pinctrl *pinctrl; 344 int ret; 345 346 /* bail out early if no DT data: */ 347 if (!node) { 348 dev_err(&pdev->dev, "device-tree data is missing\n"); 349 return -ENXIO; 350 } 351 352 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL); 353 if (!panel_mod) 354 return -ENOMEM; 355 356 bl_node = of_parse_phandle(node, "backlight", 0); 357 if (bl_node) { 358 panel_mod->backlight = of_find_backlight_by_node(bl_node); 359 of_node_put(bl_node); 360 361 if (!panel_mod->backlight) 362 return -EPROBE_DEFER; 363 364 dev_info(&pdev->dev, "found backlight\n"); 365 } 366 367 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 368 GPIOD_OUT_LOW); 369 if (IS_ERR(panel_mod->enable_gpio)) { 370 ret = PTR_ERR(panel_mod->enable_gpio); 371 dev_err(&pdev->dev, "failed to request enable GPIO\n"); 372 goto fail_backlight; 373 } 374 375 if (panel_mod->enable_gpio) 376 dev_info(&pdev->dev, "found enable GPIO\n"); 377 378 mod = &panel_mod->base; 379 pdev->dev.platform_data = mod; 380 381 tilcdc_module_init(mod, "panel", &panel_module_ops); 382 383 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 384 if (IS_ERR(pinctrl)) 385 dev_warn(&pdev->dev, "pins are not configured\n"); 386 387 panel_mod->timings = of_get_display_timings(node); 388 if (!panel_mod->timings) { 389 dev_err(&pdev->dev, "could not get panel timings\n"); 390 ret = -EINVAL; 391 goto fail_free; 392 } 393 394 panel_mod->info = of_get_panel_info(node); 395 if (!panel_mod->info) { 396 dev_err(&pdev->dev, "could not get panel info\n"); 397 ret = -EINVAL; 398 goto fail_timings; 399 } 400 401 return 0; 402 403 fail_timings: 404 display_timings_release(panel_mod->timings); 405 406 fail_free: 407 tilcdc_module_cleanup(mod); 408 409 fail_backlight: 410 if (panel_mod->backlight) 411 put_device(&panel_mod->backlight->dev); 412 return ret; 413 } 414 415 static int panel_remove(struct platform_device *pdev) 416 { 417 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); 418 struct panel_module *panel_mod = to_panel_module(mod); 419 struct backlight_device *backlight = panel_mod->backlight; 420 421 if (backlight) 422 put_device(&backlight->dev); 423 424 display_timings_release(panel_mod->timings); 425 426 tilcdc_module_cleanup(mod); 427 kfree(panel_mod->info); 428 429 return 0; 430 } 431 432 static struct of_device_id panel_of_match[] = { 433 { .compatible = "ti,tilcdc,panel", }, 434 { }, 435 }; 436 437 struct platform_driver panel_driver = { 438 .probe = panel_probe, 439 .remove = panel_remove, 440 .driver = { 441 .owner = THIS_MODULE, 442 .name = "panel", 443 .of_match_table = panel_of_match, 444 }, 445 }; 446 447 int __init tilcdc_panel_init(void) 448 { 449 return platform_driver_register(&panel_driver); 450 } 451 452 void __exit tilcdc_panel_fini(void) 453 { 454 platform_driver_unregister(&panel_driver); 455 } 456