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 return NULL; 106 107 panel_encoder->mod = mod; 108 109 encoder = &panel_encoder->base; 110 encoder->possible_crtcs = 1; 111 112 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs, 113 DRM_MODE_ENCODER_LVDS, NULL); 114 if (ret < 0) 115 goto fail; 116 117 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs); 118 119 return encoder; 120 121 fail: 122 drm_encoder_cleanup(encoder); 123 return NULL; 124 } 125 126 /* 127 * Connector: 128 */ 129 130 struct panel_connector { 131 struct drm_connector base; 132 133 struct drm_encoder *encoder; /* our connected encoder */ 134 struct panel_module *mod; 135 }; 136 #define to_panel_connector(x) container_of(x, struct panel_connector, base) 137 138 139 static void panel_connector_destroy(struct drm_connector *connector) 140 { 141 drm_connector_unregister(connector); 142 drm_connector_cleanup(connector); 143 } 144 145 static int panel_connector_get_modes(struct drm_connector *connector) 146 { 147 struct drm_device *dev = connector->dev; 148 struct panel_connector *panel_connector = to_panel_connector(connector); 149 struct display_timings *timings = panel_connector->mod->timings; 150 int i; 151 152 for (i = 0; i < timings->num_timings; i++) { 153 struct drm_display_mode *mode = drm_mode_create(dev); 154 struct videomode vm; 155 156 if (videomode_from_timings(timings, &vm, i)) 157 break; 158 159 drm_display_mode_from_videomode(&vm, mode); 160 161 mode->type = DRM_MODE_TYPE_DRIVER; 162 163 if (timings->native_mode == i) 164 mode->type |= DRM_MODE_TYPE_PREFERRED; 165 166 drm_mode_set_name(mode); 167 drm_mode_probed_add(connector, mode); 168 } 169 170 return i; 171 } 172 173 static int panel_connector_mode_valid(struct drm_connector *connector, 174 struct drm_display_mode *mode) 175 { 176 struct tilcdc_drm_private *priv = connector->dev->dev_private; 177 /* our only constraints are what the crtc can generate: */ 178 return tilcdc_crtc_mode_valid(priv->crtc, mode); 179 } 180 181 static struct drm_encoder *panel_connector_best_encoder( 182 struct drm_connector *connector) 183 { 184 struct panel_connector *panel_connector = to_panel_connector(connector); 185 return panel_connector->encoder; 186 } 187 188 static const struct drm_connector_funcs panel_connector_funcs = { 189 .destroy = panel_connector_destroy, 190 .fill_modes = drm_helper_probe_single_connector_modes, 191 .reset = drm_atomic_helper_connector_reset, 192 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 193 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 194 }; 195 196 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = { 197 .get_modes = panel_connector_get_modes, 198 .mode_valid = panel_connector_mode_valid, 199 .best_encoder = panel_connector_best_encoder, 200 }; 201 202 static struct drm_connector *panel_connector_create(struct drm_device *dev, 203 struct panel_module *mod, struct drm_encoder *encoder) 204 { 205 struct panel_connector *panel_connector; 206 struct drm_connector *connector; 207 int ret; 208 209 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector), 210 GFP_KERNEL); 211 if (!panel_connector) 212 return NULL; 213 214 panel_connector->encoder = encoder; 215 panel_connector->mod = mod; 216 217 connector = &panel_connector->base; 218 219 drm_connector_init(dev, connector, &panel_connector_funcs, 220 DRM_MODE_CONNECTOR_LVDS); 221 drm_connector_helper_add(connector, &panel_connector_helper_funcs); 222 223 connector->interlace_allowed = 0; 224 connector->doublescan_allowed = 0; 225 226 ret = drm_connector_attach_encoder(connector, encoder); 227 if (ret) 228 goto fail; 229 230 return connector; 231 232 fail: 233 panel_connector_destroy(connector); 234 return NULL; 235 } 236 237 /* 238 * Module: 239 */ 240 241 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) 242 { 243 struct panel_module *panel_mod = to_panel_module(mod); 244 struct tilcdc_drm_private *priv = dev->dev_private; 245 struct drm_encoder *encoder; 246 struct drm_connector *connector; 247 248 encoder = panel_encoder_create(dev, panel_mod); 249 if (!encoder) 250 return -ENOMEM; 251 252 connector = panel_connector_create(dev, panel_mod, encoder); 253 if (!connector) 254 return -ENOMEM; 255 256 priv->encoders[priv->num_encoders++] = encoder; 257 priv->connectors[priv->num_connectors++] = connector; 258 259 tilcdc_crtc_set_panel_info(priv->crtc, 260 to_panel_encoder(encoder)->mod->info); 261 262 return 0; 263 } 264 265 static const struct tilcdc_module_ops panel_module_ops = { 266 .modeset_init = panel_modeset_init, 267 }; 268 269 /* 270 * Device: 271 */ 272 273 /* maybe move this somewhere common if it is needed by other outputs? */ 274 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) 275 { 276 struct device_node *info_np; 277 struct tilcdc_panel_info *info; 278 int ret = 0; 279 280 if (!np) { 281 pr_err("%s: no devicenode given\n", __func__); 282 return NULL; 283 } 284 285 info_np = of_get_child_by_name(np, "panel-info"); 286 if (!info_np) { 287 pr_err("%s: could not find panel-info node\n", __func__); 288 return NULL; 289 } 290 291 info = kzalloc(sizeof(*info), GFP_KERNEL); 292 if (!info) 293 goto put_node; 294 295 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); 296 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); 297 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); 298 ret |= of_property_read_u32(info_np, "bpp", &info->bpp); 299 ret |= of_property_read_u32(info_np, "fdd", &info->fdd); 300 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); 301 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); 302 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); 303 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); 304 305 /* optional: */ 306 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); 307 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); 308 309 if (ret) { 310 pr_err("%s: error reading panel-info properties\n", __func__); 311 kfree(info); 312 info = NULL; 313 } 314 315 put_node: 316 of_node_put(info_np); 317 return info; 318 } 319 320 static int panel_probe(struct platform_device *pdev) 321 { 322 struct device_node *bl_node, *node = pdev->dev.of_node; 323 struct panel_module *panel_mod; 324 struct tilcdc_module *mod; 325 struct pinctrl *pinctrl; 326 int ret; 327 328 /* bail out early if no DT data: */ 329 if (!node) { 330 dev_err(&pdev->dev, "device-tree data is missing\n"); 331 return -ENXIO; 332 } 333 334 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL); 335 if (!panel_mod) 336 return -ENOMEM; 337 338 bl_node = of_parse_phandle(node, "backlight", 0); 339 if (bl_node) { 340 panel_mod->backlight = of_find_backlight_by_node(bl_node); 341 of_node_put(bl_node); 342 343 if (!panel_mod->backlight) 344 return -EPROBE_DEFER; 345 346 dev_info(&pdev->dev, "found backlight\n"); 347 } 348 349 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 350 GPIOD_OUT_LOW); 351 if (IS_ERR(panel_mod->enable_gpio)) { 352 ret = PTR_ERR(panel_mod->enable_gpio); 353 dev_err(&pdev->dev, "failed to request enable GPIO\n"); 354 goto fail_backlight; 355 } 356 357 if (panel_mod->enable_gpio) 358 dev_info(&pdev->dev, "found enable GPIO\n"); 359 360 mod = &panel_mod->base; 361 pdev->dev.platform_data = mod; 362 363 tilcdc_module_init(mod, "panel", &panel_module_ops); 364 365 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 366 if (IS_ERR(pinctrl)) 367 dev_warn(&pdev->dev, "pins are not configured\n"); 368 369 panel_mod->timings = of_get_display_timings(node); 370 if (!panel_mod->timings) { 371 dev_err(&pdev->dev, "could not get panel timings\n"); 372 ret = -EINVAL; 373 goto fail_free; 374 } 375 376 panel_mod->info = of_get_panel_info(node); 377 if (!panel_mod->info) { 378 dev_err(&pdev->dev, "could not get panel info\n"); 379 ret = -EINVAL; 380 goto fail_timings; 381 } 382 383 return 0; 384 385 fail_timings: 386 display_timings_release(panel_mod->timings); 387 388 fail_free: 389 tilcdc_module_cleanup(mod); 390 391 fail_backlight: 392 if (panel_mod->backlight) 393 put_device(&panel_mod->backlight->dev); 394 return ret; 395 } 396 397 static int panel_remove(struct platform_device *pdev) 398 { 399 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); 400 struct panel_module *panel_mod = to_panel_module(mod); 401 struct backlight_device *backlight = panel_mod->backlight; 402 403 if (backlight) 404 put_device(&backlight->dev); 405 406 display_timings_release(panel_mod->timings); 407 408 tilcdc_module_cleanup(mod); 409 kfree(panel_mod->info); 410 411 return 0; 412 } 413 414 static const 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 = "tilcdc-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