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 .dpms = drm_atomic_helper_connector_dpms, 193 .fill_modes = drm_helper_probe_single_connector_modes, 194 .reset = drm_atomic_helper_connector_reset, 195 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 196 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 197 }; 198 199 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = { 200 .get_modes = panel_connector_get_modes, 201 .mode_valid = panel_connector_mode_valid, 202 .best_encoder = panel_connector_best_encoder, 203 }; 204 205 static struct drm_connector *panel_connector_create(struct drm_device *dev, 206 struct panel_module *mod, struct drm_encoder *encoder) 207 { 208 struct panel_connector *panel_connector; 209 struct drm_connector *connector; 210 int ret; 211 212 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector), 213 GFP_KERNEL); 214 if (!panel_connector) { 215 dev_err(dev->dev, "allocation failed\n"); 216 return NULL; 217 } 218 219 panel_connector->encoder = encoder; 220 panel_connector->mod = mod; 221 222 connector = &panel_connector->base; 223 224 drm_connector_init(dev, connector, &panel_connector_funcs, 225 DRM_MODE_CONNECTOR_LVDS); 226 drm_connector_helper_add(connector, &panel_connector_helper_funcs); 227 228 connector->interlace_allowed = 0; 229 connector->doublescan_allowed = 0; 230 231 ret = drm_mode_connector_attach_encoder(connector, encoder); 232 if (ret) 233 goto fail; 234 235 return connector; 236 237 fail: 238 panel_connector_destroy(connector); 239 return NULL; 240 } 241 242 /* 243 * Module: 244 */ 245 246 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) 247 { 248 struct panel_module *panel_mod = to_panel_module(mod); 249 struct tilcdc_drm_private *priv = dev->dev_private; 250 struct drm_encoder *encoder; 251 struct drm_connector *connector; 252 253 encoder = panel_encoder_create(dev, panel_mod); 254 if (!encoder) 255 return -ENOMEM; 256 257 connector = panel_connector_create(dev, panel_mod, encoder); 258 if (!connector) 259 return -ENOMEM; 260 261 priv->encoders[priv->num_encoders++] = encoder; 262 priv->connectors[priv->num_connectors++] = connector; 263 264 tilcdc_crtc_set_panel_info(priv->crtc, 265 to_panel_encoder(encoder)->mod->info); 266 267 return 0; 268 } 269 270 static const struct tilcdc_module_ops panel_module_ops = { 271 .modeset_init = panel_modeset_init, 272 }; 273 274 /* 275 * Device: 276 */ 277 278 /* maybe move this somewhere common if it is needed by other outputs? */ 279 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) 280 { 281 struct device_node *info_np; 282 struct tilcdc_panel_info *info; 283 int ret = 0; 284 285 if (!np) { 286 pr_err("%s: no devicenode given\n", __func__); 287 return NULL; 288 } 289 290 info_np = of_get_child_by_name(np, "panel-info"); 291 if (!info_np) { 292 pr_err("%s: could not find panel-info node\n", __func__); 293 return NULL; 294 } 295 296 info = kzalloc(sizeof(*info), GFP_KERNEL); 297 if (!info) { 298 pr_err("%s: allocation failed\n", __func__); 299 of_node_put(info_np); 300 return NULL; 301 } 302 303 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); 304 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); 305 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); 306 ret |= of_property_read_u32(info_np, "bpp", &info->bpp); 307 ret |= of_property_read_u32(info_np, "fdd", &info->fdd); 308 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); 309 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); 310 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); 311 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); 312 313 /* optional: */ 314 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); 315 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); 316 317 if (ret) { 318 pr_err("%s: error reading panel-info properties\n", __func__); 319 kfree(info); 320 of_node_put(info_np); 321 return NULL; 322 } 323 of_node_put(info_np); 324 325 return info; 326 } 327 328 static int panel_probe(struct platform_device *pdev) 329 { 330 struct device_node *bl_node, *node = pdev->dev.of_node; 331 struct panel_module *panel_mod; 332 struct tilcdc_module *mod; 333 struct pinctrl *pinctrl; 334 int ret; 335 336 /* bail out early if no DT data: */ 337 if (!node) { 338 dev_err(&pdev->dev, "device-tree data is missing\n"); 339 return -ENXIO; 340 } 341 342 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL); 343 if (!panel_mod) 344 return -ENOMEM; 345 346 bl_node = of_parse_phandle(node, "backlight", 0); 347 if (bl_node) { 348 panel_mod->backlight = of_find_backlight_by_node(bl_node); 349 of_node_put(bl_node); 350 351 if (!panel_mod->backlight) 352 return -EPROBE_DEFER; 353 354 dev_info(&pdev->dev, "found backlight\n"); 355 } 356 357 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 358 GPIOD_OUT_LOW); 359 if (IS_ERR(panel_mod->enable_gpio)) { 360 ret = PTR_ERR(panel_mod->enable_gpio); 361 dev_err(&pdev->dev, "failed to request enable GPIO\n"); 362 goto fail_backlight; 363 } 364 365 if (panel_mod->enable_gpio) 366 dev_info(&pdev->dev, "found enable GPIO\n"); 367 368 mod = &panel_mod->base; 369 pdev->dev.platform_data = mod; 370 371 tilcdc_module_init(mod, "panel", &panel_module_ops); 372 373 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 374 if (IS_ERR(pinctrl)) 375 dev_warn(&pdev->dev, "pins are not configured\n"); 376 377 panel_mod->timings = of_get_display_timings(node); 378 if (!panel_mod->timings) { 379 dev_err(&pdev->dev, "could not get panel timings\n"); 380 ret = -EINVAL; 381 goto fail_free; 382 } 383 384 panel_mod->info = of_get_panel_info(node); 385 if (!panel_mod->info) { 386 dev_err(&pdev->dev, "could not get panel info\n"); 387 ret = -EINVAL; 388 goto fail_timings; 389 } 390 391 return 0; 392 393 fail_timings: 394 display_timings_release(panel_mod->timings); 395 396 fail_free: 397 tilcdc_module_cleanup(mod); 398 399 fail_backlight: 400 if (panel_mod->backlight) 401 put_device(&panel_mod->backlight->dev); 402 return ret; 403 } 404 405 static int panel_remove(struct platform_device *pdev) 406 { 407 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); 408 struct panel_module *panel_mod = to_panel_module(mod); 409 struct backlight_device *backlight = panel_mod->backlight; 410 411 if (backlight) 412 put_device(&backlight->dev); 413 414 display_timings_release(panel_mod->timings); 415 416 tilcdc_module_cleanup(mod); 417 kfree(panel_mod->info); 418 419 return 0; 420 } 421 422 static struct of_device_id panel_of_match[] = { 423 { .compatible = "ti,tilcdc,panel", }, 424 { }, 425 }; 426 427 struct platform_driver panel_driver = { 428 .probe = panel_probe, 429 .remove = panel_remove, 430 .driver = { 431 .owner = THIS_MODULE, 432 .name = "panel", 433 .of_match_table = panel_of_match, 434 }, 435 }; 436 437 int __init tilcdc_panel_init(void) 438 { 439 return platform_driver_register(&panel_driver); 440 } 441 442 void __exit tilcdc_panel_fini(void) 443 { 444 platform_driver_unregister(&panel_driver); 445 } 446