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 int panel_connector_get_modes(struct drm_connector *connector) 148 { 149 struct drm_device *dev = connector->dev; 150 struct panel_connector *panel_connector = to_panel_connector(connector); 151 struct display_timings *timings = panel_connector->mod->timings; 152 int i; 153 154 for (i = 0; i < timings->num_timings; i++) { 155 struct drm_display_mode *mode = drm_mode_create(dev); 156 struct videomode vm; 157 158 if (videomode_from_timings(timings, &vm, i)) 159 break; 160 161 drm_display_mode_from_videomode(&vm, mode); 162 163 mode->type = DRM_MODE_TYPE_DRIVER; 164 165 if (timings->native_mode == i) 166 mode->type |= DRM_MODE_TYPE_PREFERRED; 167 168 drm_mode_set_name(mode); 169 drm_mode_probed_add(connector, mode); 170 } 171 172 return i; 173 } 174 175 static int panel_connector_mode_valid(struct drm_connector *connector, 176 struct drm_display_mode *mode) 177 { 178 struct tilcdc_drm_private *priv = connector->dev->dev_private; 179 /* our only constraints are what the crtc can generate: */ 180 return tilcdc_crtc_mode_valid(priv->crtc, mode); 181 } 182 183 static struct drm_encoder *panel_connector_best_encoder( 184 struct drm_connector *connector) 185 { 186 struct panel_connector *panel_connector = to_panel_connector(connector); 187 return panel_connector->encoder; 188 } 189 190 static const struct drm_connector_funcs panel_connector_funcs = { 191 .destroy = panel_connector_destroy, 192 .fill_modes = drm_helper_probe_single_connector_modes, 193 .reset = drm_atomic_helper_connector_reset, 194 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 195 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 196 }; 197 198 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = { 199 .get_modes = panel_connector_get_modes, 200 .mode_valid = panel_connector_mode_valid, 201 .best_encoder = panel_connector_best_encoder, 202 }; 203 204 static struct drm_connector *panel_connector_create(struct drm_device *dev, 205 struct panel_module *mod, struct drm_encoder *encoder) 206 { 207 struct panel_connector *panel_connector; 208 struct drm_connector *connector; 209 int ret; 210 211 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector), 212 GFP_KERNEL); 213 if (!panel_connector) { 214 dev_err(dev->dev, "allocation failed\n"); 215 return NULL; 216 } 217 218 panel_connector->encoder = encoder; 219 panel_connector->mod = mod; 220 221 connector = &panel_connector->base; 222 223 drm_connector_init(dev, connector, &panel_connector_funcs, 224 DRM_MODE_CONNECTOR_LVDS); 225 drm_connector_helper_add(connector, &panel_connector_helper_funcs); 226 227 connector->interlace_allowed = 0; 228 connector->doublescan_allowed = 0; 229 230 ret = drm_mode_connector_attach_encoder(connector, encoder); 231 if (ret) 232 goto fail; 233 234 return connector; 235 236 fail: 237 panel_connector_destroy(connector); 238 return NULL; 239 } 240 241 /* 242 * Module: 243 */ 244 245 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) 246 { 247 struct panel_module *panel_mod = to_panel_module(mod); 248 struct tilcdc_drm_private *priv = dev->dev_private; 249 struct drm_encoder *encoder; 250 struct drm_connector *connector; 251 252 encoder = panel_encoder_create(dev, panel_mod); 253 if (!encoder) 254 return -ENOMEM; 255 256 connector = panel_connector_create(dev, panel_mod, encoder); 257 if (!connector) 258 return -ENOMEM; 259 260 priv->encoders[priv->num_encoders++] = encoder; 261 priv->connectors[priv->num_connectors++] = connector; 262 263 tilcdc_crtc_set_panel_info(priv->crtc, 264 to_panel_encoder(encoder)->mod->info); 265 266 return 0; 267 } 268 269 static const struct tilcdc_module_ops panel_module_ops = { 270 .modeset_init = panel_modeset_init, 271 }; 272 273 /* 274 * Device: 275 */ 276 277 /* maybe move this somewhere common if it is needed by other outputs? */ 278 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) 279 { 280 struct device_node *info_np; 281 struct tilcdc_panel_info *info; 282 int ret = 0; 283 284 if (!np) { 285 pr_err("%s: no devicenode given\n", __func__); 286 return NULL; 287 } 288 289 info_np = of_get_child_by_name(np, "panel-info"); 290 if (!info_np) { 291 pr_err("%s: could not find panel-info node\n", __func__); 292 return NULL; 293 } 294 295 info = kzalloc(sizeof(*info), GFP_KERNEL); 296 if (!info) { 297 pr_err("%s: allocation failed\n", __func__); 298 of_node_put(info_np); 299 return NULL; 300 } 301 302 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); 303 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); 304 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); 305 ret |= of_property_read_u32(info_np, "bpp", &info->bpp); 306 ret |= of_property_read_u32(info_np, "fdd", &info->fdd); 307 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); 308 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); 309 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); 310 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); 311 312 /* optional: */ 313 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); 314 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); 315 316 if (ret) { 317 pr_err("%s: error reading panel-info properties\n", __func__); 318 kfree(info); 319 of_node_put(info_np); 320 return NULL; 321 } 322 of_node_put(info_np); 323 324 return info; 325 } 326 327 static int panel_probe(struct platform_device *pdev) 328 { 329 struct device_node *bl_node, *node = pdev->dev.of_node; 330 struct panel_module *panel_mod; 331 struct tilcdc_module *mod; 332 struct pinctrl *pinctrl; 333 int ret; 334 335 /* bail out early if no DT data: */ 336 if (!node) { 337 dev_err(&pdev->dev, "device-tree data is missing\n"); 338 return -ENXIO; 339 } 340 341 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL); 342 if (!panel_mod) 343 return -ENOMEM; 344 345 bl_node = of_parse_phandle(node, "backlight", 0); 346 if (bl_node) { 347 panel_mod->backlight = of_find_backlight_by_node(bl_node); 348 of_node_put(bl_node); 349 350 if (!panel_mod->backlight) 351 return -EPROBE_DEFER; 352 353 dev_info(&pdev->dev, "found backlight\n"); 354 } 355 356 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 357 GPIOD_OUT_LOW); 358 if (IS_ERR(panel_mod->enable_gpio)) { 359 ret = PTR_ERR(panel_mod->enable_gpio); 360 dev_err(&pdev->dev, "failed to request enable GPIO\n"); 361 goto fail_backlight; 362 } 363 364 if (panel_mod->enable_gpio) 365 dev_info(&pdev->dev, "found enable GPIO\n"); 366 367 mod = &panel_mod->base; 368 pdev->dev.platform_data = mod; 369 370 tilcdc_module_init(mod, "panel", &panel_module_ops); 371 372 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 373 if (IS_ERR(pinctrl)) 374 dev_warn(&pdev->dev, "pins are not configured\n"); 375 376 panel_mod->timings = of_get_display_timings(node); 377 if (!panel_mod->timings) { 378 dev_err(&pdev->dev, "could not get panel timings\n"); 379 ret = -EINVAL; 380 goto fail_free; 381 } 382 383 panel_mod->info = of_get_panel_info(node); 384 if (!panel_mod->info) { 385 dev_err(&pdev->dev, "could not get panel info\n"); 386 ret = -EINVAL; 387 goto fail_timings; 388 } 389 390 return 0; 391 392 fail_timings: 393 display_timings_release(panel_mod->timings); 394 395 fail_free: 396 tilcdc_module_cleanup(mod); 397 398 fail_backlight: 399 if (panel_mod->backlight) 400 put_device(&panel_mod->backlight->dev); 401 return ret; 402 } 403 404 static int panel_remove(struct platform_device *pdev) 405 { 406 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); 407 struct panel_module *panel_mod = to_panel_module(mod); 408 struct backlight_device *backlight = panel_mod->backlight; 409 410 if (backlight) 411 put_device(&backlight->dev); 412 413 display_timings_release(panel_mod->timings); 414 415 tilcdc_module_cleanup(mod); 416 kfree(panel_mod->info); 417 418 return 0; 419 } 420 421 static const struct of_device_id panel_of_match[] = { 422 { .compatible = "ti,tilcdc,panel", }, 423 { }, 424 }; 425 426 struct platform_driver panel_driver = { 427 .probe = panel_probe, 428 .remove = panel_remove, 429 .driver = { 430 .owner = THIS_MODULE, 431 .name = "panel", 432 .of_match_table = panel_of_match, 433 }, 434 }; 435 436 int __init tilcdc_panel_init(void) 437 { 438 return platform_driver_register(&panel_driver); 439 } 440 441 void __exit tilcdc_panel_fini(void) 442 { 443 platform_driver_unregister(&panel_driver); 444 } 445