1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Texas Instruments 4 * Author: Rob Clark <robdclark@gmail.com> 5 */ 6 7 #include <linux/backlight.h> 8 #include <linux/gpio/consumer.h> 9 #include <linux/platform_device.h> 10 11 #include <video/display_timing.h> 12 #include <video/of_display_timing.h> 13 #include <video/videomode.h> 14 15 #include <drm/drm_atomic_state_helper.h> 16 #include <drm/drm_connector.h> 17 #include <drm/drm_modeset_helper_vtables.h> 18 #include <drm/drm_probe_helper.h> 19 #include <drm/drm_simple_kms_helper.h> 20 21 #include "tilcdc_drv.h" 22 #include "tilcdc_panel.h" 23 24 struct panel_module { 25 struct tilcdc_module base; 26 struct tilcdc_panel_info *info; 27 struct display_timings *timings; 28 struct backlight_device *backlight; 29 struct gpio_desc *enable_gpio; 30 }; 31 #define to_panel_module(x) container_of(x, struct panel_module, base) 32 33 34 /* 35 * Encoder: 36 */ 37 38 struct panel_encoder { 39 struct drm_encoder base; 40 struct panel_module *mod; 41 }; 42 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base) 43 44 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode) 45 { 46 struct panel_encoder *panel_encoder = to_panel_encoder(encoder); 47 struct backlight_device *backlight = panel_encoder->mod->backlight; 48 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio; 49 50 if (backlight) { 51 backlight->props.power = mode == DRM_MODE_DPMS_ON ? 52 BACKLIGHT_POWER_ON : BACKLIGHT_POWER_OFF; 53 backlight_update_status(backlight); 54 } 55 56 if (gpio) 57 gpiod_set_value_cansleep(gpio, 58 mode == DRM_MODE_DPMS_ON ? 1 : 0); 59 } 60 61 static void panel_encoder_prepare(struct drm_encoder *encoder) 62 { 63 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); 64 } 65 66 static void panel_encoder_commit(struct drm_encoder *encoder) 67 { 68 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON); 69 } 70 71 static void panel_encoder_mode_set(struct drm_encoder *encoder, 72 struct drm_display_mode *mode, 73 struct drm_display_mode *adjusted_mode) 74 { 75 /* nothing needed */ 76 } 77 78 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = { 79 .dpms = panel_encoder_dpms, 80 .prepare = panel_encoder_prepare, 81 .commit = panel_encoder_commit, 82 .mode_set = panel_encoder_mode_set, 83 }; 84 85 static struct drm_encoder *panel_encoder_create(struct drm_device *dev, 86 struct panel_module *mod) 87 { 88 struct panel_encoder *panel_encoder; 89 struct drm_encoder *encoder; 90 int ret; 91 92 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder), 93 GFP_KERNEL); 94 if (!panel_encoder) 95 return NULL; 96 97 panel_encoder->mod = mod; 98 99 encoder = &panel_encoder->base; 100 encoder->possible_crtcs = 1; 101 102 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS); 103 if (ret < 0) 104 goto fail; 105 106 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs); 107 108 return encoder; 109 110 fail: 111 drm_encoder_cleanup(encoder); 112 return NULL; 113 } 114 115 /* 116 * Connector: 117 */ 118 119 struct panel_connector { 120 struct drm_connector base; 121 122 struct drm_encoder *encoder; /* our connected encoder */ 123 struct panel_module *mod; 124 }; 125 #define to_panel_connector(x) container_of(x, struct panel_connector, base) 126 127 128 static void panel_connector_destroy(struct drm_connector *connector) 129 { 130 drm_connector_unregister(connector); 131 drm_connector_cleanup(connector); 132 } 133 134 static int panel_connector_get_modes(struct drm_connector *connector) 135 { 136 struct drm_device *dev = connector->dev; 137 struct panel_connector *panel_connector = to_panel_connector(connector); 138 struct display_timings *timings = panel_connector->mod->timings; 139 int i; 140 141 for (i = 0; i < timings->num_timings; i++) { 142 struct drm_display_mode *mode; 143 struct videomode vm; 144 145 if (videomode_from_timings(timings, &vm, i)) 146 break; 147 148 mode = drm_mode_create(dev); 149 if (!mode) 150 break; 151 152 drm_display_mode_from_videomode(&vm, mode); 153 154 mode->type = DRM_MODE_TYPE_DRIVER; 155 156 if (timings->native_mode == i) 157 mode->type |= DRM_MODE_TYPE_PREFERRED; 158 159 drm_mode_set_name(mode); 160 drm_mode_probed_add(connector, mode); 161 } 162 163 return i; 164 } 165 166 static struct drm_encoder *panel_connector_best_encoder( 167 struct drm_connector *connector) 168 { 169 struct panel_connector *panel_connector = to_panel_connector(connector); 170 return panel_connector->encoder; 171 } 172 173 static const struct drm_connector_funcs panel_connector_funcs = { 174 .destroy = panel_connector_destroy, 175 .fill_modes = drm_helper_probe_single_connector_modes, 176 .reset = drm_atomic_helper_connector_reset, 177 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 178 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 179 }; 180 181 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = { 182 .get_modes = panel_connector_get_modes, 183 .best_encoder = panel_connector_best_encoder, 184 }; 185 186 static struct drm_connector *panel_connector_create(struct drm_device *dev, 187 struct panel_module *mod, struct drm_encoder *encoder) 188 { 189 struct panel_connector *panel_connector; 190 struct drm_connector *connector; 191 int ret; 192 193 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector), 194 GFP_KERNEL); 195 if (!panel_connector) 196 return NULL; 197 198 panel_connector->encoder = encoder; 199 panel_connector->mod = mod; 200 201 connector = &panel_connector->base; 202 203 drm_connector_init(dev, connector, &panel_connector_funcs, 204 DRM_MODE_CONNECTOR_LVDS); 205 drm_connector_helper_add(connector, &panel_connector_helper_funcs); 206 207 connector->interlace_allowed = 0; 208 connector->doublescan_allowed = 0; 209 210 ret = drm_connector_attach_encoder(connector, encoder); 211 if (ret) 212 goto fail; 213 214 return connector; 215 216 fail: 217 panel_connector_destroy(connector); 218 return NULL; 219 } 220 221 /* 222 * Module: 223 */ 224 225 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) 226 { 227 struct panel_module *panel_mod = to_panel_module(mod); 228 struct tilcdc_drm_private *priv = dev->dev_private; 229 struct drm_encoder *encoder; 230 struct drm_connector *connector; 231 232 encoder = panel_encoder_create(dev, panel_mod); 233 if (!encoder) 234 return -ENOMEM; 235 236 connector = panel_connector_create(dev, panel_mod, encoder); 237 if (!connector) 238 return -ENOMEM; 239 240 priv->encoders[priv->num_encoders++] = encoder; 241 priv->connectors[priv->num_connectors++] = connector; 242 243 tilcdc_crtc_set_panel_info(priv->crtc, 244 to_panel_encoder(encoder)->mod->info); 245 246 return 0; 247 } 248 249 static const struct tilcdc_module_ops panel_module_ops = { 250 .modeset_init = panel_modeset_init, 251 }; 252 253 /* 254 * Device: 255 */ 256 257 /* maybe move this somewhere common if it is needed by other outputs? */ 258 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) 259 { 260 struct device_node *info_np; 261 struct tilcdc_panel_info *info; 262 int ret = 0; 263 264 if (!np) { 265 pr_err("%s: no devicenode given\n", __func__); 266 return NULL; 267 } 268 269 info_np = of_get_child_by_name(np, "panel-info"); 270 if (!info_np) { 271 pr_err("%s: could not find panel-info node\n", __func__); 272 return NULL; 273 } 274 275 info = kzalloc(sizeof(*info), GFP_KERNEL); 276 if (!info) 277 goto put_node; 278 279 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); 280 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); 281 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); 282 ret |= of_property_read_u32(info_np, "bpp", &info->bpp); 283 ret |= of_property_read_u32(info_np, "fdd", &info->fdd); 284 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); 285 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); 286 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); 287 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); 288 289 /* optional: */ 290 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); 291 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); 292 293 if (ret) { 294 pr_err("%s: error reading panel-info properties\n", __func__); 295 kfree(info); 296 info = NULL; 297 } 298 299 put_node: 300 of_node_put(info_np); 301 return info; 302 } 303 304 static int panel_probe(struct platform_device *pdev) 305 { 306 struct device_node *node = pdev->dev.of_node; 307 struct backlight_device *backlight; 308 struct panel_module *panel_mod; 309 struct tilcdc_module *mod; 310 int ret; 311 312 /* bail out early if no DT data: */ 313 if (!node) { 314 dev_err(&pdev->dev, "device-tree data is missing\n"); 315 return -ENXIO; 316 } 317 318 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL); 319 if (!panel_mod) 320 return -ENOMEM; 321 322 backlight = devm_of_find_backlight(&pdev->dev); 323 if (IS_ERR(backlight)) 324 return PTR_ERR(backlight); 325 panel_mod->backlight = backlight; 326 327 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 328 GPIOD_OUT_LOW); 329 if (IS_ERR(panel_mod->enable_gpio)) { 330 ret = PTR_ERR(panel_mod->enable_gpio); 331 dev_err(&pdev->dev, "failed to request enable GPIO\n"); 332 goto fail_backlight; 333 } 334 335 if (panel_mod->enable_gpio) 336 dev_info(&pdev->dev, "found enable GPIO\n"); 337 338 mod = &panel_mod->base; 339 pdev->dev.platform_data = mod; 340 341 tilcdc_module_init(mod, "panel", &panel_module_ops); 342 343 panel_mod->timings = of_get_display_timings(node); 344 if (!panel_mod->timings) { 345 dev_err(&pdev->dev, "could not get panel timings\n"); 346 ret = -EINVAL; 347 goto fail_free; 348 } 349 350 panel_mod->info = of_get_panel_info(node); 351 if (!panel_mod->info) { 352 dev_err(&pdev->dev, "could not get panel info\n"); 353 ret = -EINVAL; 354 goto fail_timings; 355 } 356 357 return 0; 358 359 fail_timings: 360 display_timings_release(panel_mod->timings); 361 362 fail_free: 363 tilcdc_module_cleanup(mod); 364 365 fail_backlight: 366 if (panel_mod->backlight) 367 put_device(&panel_mod->backlight->dev); 368 return ret; 369 } 370 371 static void panel_remove(struct platform_device *pdev) 372 { 373 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); 374 struct panel_module *panel_mod = to_panel_module(mod); 375 struct backlight_device *backlight = panel_mod->backlight; 376 377 if (backlight) 378 put_device(&backlight->dev); 379 380 display_timings_release(panel_mod->timings); 381 382 tilcdc_module_cleanup(mod); 383 kfree(panel_mod->info); 384 } 385 386 static const struct of_device_id panel_of_match[] = { 387 { .compatible = "ti,tilcdc,panel", }, 388 { }, 389 }; 390 391 static struct platform_driver panel_driver = { 392 .probe = panel_probe, 393 .remove_new = panel_remove, 394 .driver = { 395 .name = "tilcdc-panel", 396 .of_match_table = panel_of_match, 397 }, 398 }; 399 400 int __init tilcdc_panel_init(void) 401 { 402 return platform_driver_register(&panel_driver); 403 } 404 405 void __exit tilcdc_panel_fini(void) 406 { 407 platform_driver_unregister(&panel_driver); 408 } 409