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/gpio/consumer.h> 8 #include <linux/pinctrl/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 20 #include "tilcdc_drv.h" 21 #include "tilcdc_panel.h" 22 23 struct panel_module { 24 struct tilcdc_module base; 25 struct tilcdc_panel_info *info; 26 struct display_timings *timings; 27 struct backlight_device *backlight; 28 struct gpio_desc *enable_gpio; 29 }; 30 #define to_panel_module(x) container_of(x, struct panel_module, base) 31 32 33 /* 34 * Encoder: 35 */ 36 37 struct panel_encoder { 38 struct drm_encoder base; 39 struct panel_module *mod; 40 }; 41 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base) 42 43 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode) 44 { 45 struct panel_encoder *panel_encoder = to_panel_encoder(encoder); 46 struct backlight_device *backlight = panel_encoder->mod->backlight; 47 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio; 48 49 if (backlight) { 50 backlight->props.power = mode == DRM_MODE_DPMS_ON ? 51 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; 52 backlight_update_status(backlight); 53 } 54 55 if (gpio) 56 gpiod_set_value_cansleep(gpio, 57 mode == DRM_MODE_DPMS_ON ? 1 : 0); 58 } 59 60 static void panel_encoder_prepare(struct drm_encoder *encoder) 61 { 62 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); 63 } 64 65 static void panel_encoder_commit(struct drm_encoder *encoder) 66 { 67 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON); 68 } 69 70 static void panel_encoder_mode_set(struct drm_encoder *encoder, 71 struct drm_display_mode *mode, 72 struct drm_display_mode *adjusted_mode) 73 { 74 /* nothing needed */ 75 } 76 77 static const struct drm_encoder_funcs panel_encoder_funcs = { 78 .destroy = drm_encoder_cleanup, 79 }; 80 81 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = { 82 .dpms = panel_encoder_dpms, 83 .prepare = panel_encoder_prepare, 84 .commit = panel_encoder_commit, 85 .mode_set = panel_encoder_mode_set, 86 }; 87 88 static struct drm_encoder *panel_encoder_create(struct drm_device *dev, 89 struct panel_module *mod) 90 { 91 struct panel_encoder *panel_encoder; 92 struct drm_encoder *encoder; 93 int ret; 94 95 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder), 96 GFP_KERNEL); 97 if (!panel_encoder) 98 return NULL; 99 100 panel_encoder->mod = mod; 101 102 encoder = &panel_encoder->base; 103 encoder->possible_crtcs = 1; 104 105 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs, 106 DRM_MODE_ENCODER_LVDS, NULL); 107 if (ret < 0) 108 goto fail; 109 110 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs); 111 112 return encoder; 113 114 fail: 115 drm_encoder_cleanup(encoder); 116 return NULL; 117 } 118 119 /* 120 * Connector: 121 */ 122 123 struct panel_connector { 124 struct drm_connector base; 125 126 struct drm_encoder *encoder; /* our connected encoder */ 127 struct panel_module *mod; 128 }; 129 #define to_panel_connector(x) container_of(x, struct panel_connector, base) 130 131 132 static void panel_connector_destroy(struct drm_connector *connector) 133 { 134 drm_connector_unregister(connector); 135 drm_connector_cleanup(connector); 136 } 137 138 static int panel_connector_get_modes(struct drm_connector *connector) 139 { 140 struct drm_device *dev = connector->dev; 141 struct panel_connector *panel_connector = to_panel_connector(connector); 142 struct display_timings *timings = panel_connector->mod->timings; 143 int i; 144 145 for (i = 0; i < timings->num_timings; i++) { 146 struct drm_display_mode *mode = drm_mode_create(dev); 147 struct videomode vm; 148 149 if (videomode_from_timings(timings, &vm, i)) 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 *bl_node, *node = pdev->dev.of_node; 307 struct panel_module *panel_mod; 308 struct tilcdc_module *mod; 309 struct pinctrl *pinctrl; 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 bl_node = of_parse_phandle(node, "backlight", 0); 323 if (bl_node) { 324 panel_mod->backlight = of_find_backlight_by_node(bl_node); 325 of_node_put(bl_node); 326 327 if (!panel_mod->backlight) 328 return -EPROBE_DEFER; 329 330 dev_info(&pdev->dev, "found backlight\n"); 331 } 332 333 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 334 GPIOD_OUT_LOW); 335 if (IS_ERR(panel_mod->enable_gpio)) { 336 ret = PTR_ERR(panel_mod->enable_gpio); 337 dev_err(&pdev->dev, "failed to request enable GPIO\n"); 338 goto fail_backlight; 339 } 340 341 if (panel_mod->enable_gpio) 342 dev_info(&pdev->dev, "found enable GPIO\n"); 343 344 mod = &panel_mod->base; 345 pdev->dev.platform_data = mod; 346 347 tilcdc_module_init(mod, "panel", &panel_module_ops); 348 349 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 350 if (IS_ERR(pinctrl)) 351 dev_warn(&pdev->dev, "pins are not configured\n"); 352 353 panel_mod->timings = of_get_display_timings(node); 354 if (!panel_mod->timings) { 355 dev_err(&pdev->dev, "could not get panel timings\n"); 356 ret = -EINVAL; 357 goto fail_free; 358 } 359 360 panel_mod->info = of_get_panel_info(node); 361 if (!panel_mod->info) { 362 dev_err(&pdev->dev, "could not get panel info\n"); 363 ret = -EINVAL; 364 goto fail_timings; 365 } 366 367 return 0; 368 369 fail_timings: 370 display_timings_release(panel_mod->timings); 371 372 fail_free: 373 tilcdc_module_cleanup(mod); 374 375 fail_backlight: 376 if (panel_mod->backlight) 377 put_device(&panel_mod->backlight->dev); 378 return ret; 379 } 380 381 static int panel_remove(struct platform_device *pdev) 382 { 383 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); 384 struct panel_module *panel_mod = to_panel_module(mod); 385 struct backlight_device *backlight = panel_mod->backlight; 386 387 if (backlight) 388 put_device(&backlight->dev); 389 390 display_timings_release(panel_mod->timings); 391 392 tilcdc_module_cleanup(mod); 393 kfree(panel_mod->info); 394 395 return 0; 396 } 397 398 static const struct of_device_id panel_of_match[] = { 399 { .compatible = "ti,tilcdc,panel", }, 400 { }, 401 }; 402 403 struct platform_driver panel_driver = { 404 .probe = panel_probe, 405 .remove = panel_remove, 406 .driver = { 407 .owner = THIS_MODULE, 408 .name = "tilcdc-panel", 409 .of_match_table = panel_of_match, 410 }, 411 }; 412 413 int __init tilcdc_panel_init(void) 414 { 415 return platform_driver_register(&panel_driver); 416 } 417 418 void __exit tilcdc_panel_fini(void) 419 { 420 platform_driver_unregister(&panel_driver); 421 } 422