drivers/gpu/drm/imx/imx-drm-core.c

   1 /*
   2  * Freescale i.MX drm driver
   3  *
   4  * Copyright (C) 2011 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16 #include <linux/component.h>
  17 #include <linux/device.h>
  18 #include <linux/dma-buf.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <drm/drmP.h>
  22 #include <drm/drm_atomic.h>
  23 #include <drm/drm_atomic_helper.h>
  24 #include <drm/drm_fb_helper.h>
  25 #include <drm/drm_crtc_helper.h>
  26 #include <drm/drm_gem_cma_helper.h>
  27 #include <drm/drm_gem_framebuffer_helper.h>
  28 #include <drm/drm_fb_cma_helper.h>
  29 #include <drm/drm_plane_helper.h>
  30 #include <drm/drm_of.h>
  31 #include <video/imx-ipu-v3.h>
  32
  33 #include "imx-drm.h"
  34 #include "ipuv3-plane.h"
  35
  36 #define MAX_CRTC        4
  37
  38 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
  39 static int legacyfb_depth = 16;
  40 module_param(legacyfb_depth, int, 0444);
  41 #endif
  42
  43 DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);
  44
  45 void imx_drm_connector_destroy(struct drm_connector *connector)
  46 {
  47         drm_connector_unregister(connector);
  48         drm_connector_cleanup(connector);
  49 }
  50 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
  51
  52 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
  53 {
  54         drm_encoder_cleanup(encoder);
  55 }
  56 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
  57
  58 static int imx_drm_atomic_check(struct drm_device *dev,
  59                                 struct drm_atomic_state *state)
  60 {
  61         int ret;
  62
  63         ret = drm_atomic_helper_check_modeset(dev, state);
  64         if (ret)
  65                 return ret;
  66
  67         ret = drm_atomic_helper_check_planes(dev, state);
  68         if (ret)
  69                 return ret;
  70
  71         /*
  72          * Check modeset again in case crtc_state->mode_changed is
  73          * updated in plane's ->atomic_check callback.
  74          */
  75         ret = drm_atomic_helper_check_modeset(dev, state);
  76         if (ret)
  77                 return ret;
  78
  79         /* Assign PRG/PRE channels and check if all constrains are satisfied. */
  80         ret = ipu_planes_assign_pre(dev, state);
  81         if (ret)
  82                 return ret;
  83
  84         return ret;
  85 }
  86
  87 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
  88         .fb_create = drm_gem_fb_create,
  89         .output_poll_changed = drm_fb_helper_output_poll_changed,
  90         .atomic_check = imx_drm_atomic_check,
  91         .atomic_commit = drm_atomic_helper_commit,
  92 };
  93
  94 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
  95 {
  96         struct drm_device *dev = state->dev;
  97         struct drm_plane *plane;
  98         struct drm_plane_state *old_plane_state, *new_plane_state;
  99         bool plane_disabling = false;
 100         int i;
 101
 102         drm_atomic_helper_commit_modeset_disables(dev, state);
 103
 104         drm_atomic_helper_commit_planes(dev, state,
 105                                 DRM_PLANE_COMMIT_ACTIVE_ONLY |
 106                                 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
 107
 108         drm_atomic_helper_commit_modeset_enables(dev, state);
 109
 110         for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
 111                 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
 112                         plane_disabling = true;
 113         }
 114
 115         /*
 116          * The flip done wait is only strictly required by imx-drm if a deferred
 117          * plane disable is in-flight. As the core requires blocking commits
 118          * to wait for the flip it is done here unconditionally. This keeps the
 119          * workitem around a bit longer than required for the majority of
 120          * non-blocking commits, but we accept that for the sake of simplicity.
 121          */
 122         drm_atomic_helper_wait_for_flip_done(dev, state);
 123
 124         if (plane_disabling) {
 125                 for_each_old_plane_in_state(state, plane, old_plane_state, i)
 126                         ipu_plane_disable_deferred(plane);
 127
 128         }
 129
 130         drm_atomic_helper_commit_hw_done(state);
 131 }
 132
 133 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
 134         .atomic_commit_tail = imx_drm_atomic_commit_tail,
 135 };
 136
 137
 138 int imx_drm_encoder_parse_of(struct drm_device *drm,
 139         struct drm_encoder *encoder, struct device_node *np)
 140 {
 141         uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
 142
 143         /*
 144          * If we failed to find the CRTC(s) which this encoder is
 145          * supposed to be connected to, it's because the CRTC has
 146          * not been registered yet.  Defer probing, and hope that
 147          * the required CRTC is added later.
 148          */
 149         if (crtc_mask == 0)
 150                 return -EPROBE_DEFER;
 151
 152         encoder->possible_crtcs = crtc_mask;
 153
 154         /* FIXME: this is the mask of outputs which can clone this output. */
 155         encoder->possible_clones = ~0;
 156
 157         return 0;
 158 }
 159 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 160
 161 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 162         /* none so far */
 163 };
 164
 165 static struct drm_driver imx_drm_driver = {
 166         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 167                                   DRIVER_ATOMIC,
 168         .lastclose              = drm_fb_helper_lastclose,
 169         .gem_free_object_unlocked = drm_gem_cma_free_object,
 170         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 171         .dumb_create            = drm_gem_cma_dumb_create,
 172
 173         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 174         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 175         .gem_prime_import       = drm_gem_prime_import,
 176         .gem_prime_export       = drm_gem_prime_export,
 177         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 178         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 179         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 180         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 181         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 182         .ioctls                 = imx_drm_ioctls,
 183         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 184         .fops                   = &imx_drm_driver_fops,
 185         .name                   = "imx-drm",
 186         .desc                   = "i.MX DRM graphics",
 187         .date                   = "20120507",
 188         .major                  = 1,
 189         .minor                  = 0,
 190         .patchlevel             = 0,
 191 };
 192
 193 static int compare_of(struct device *dev, void *data)
 194 {
 195         struct device_node *np = data;
 196
 197         /* Special case for DI, dev->of_node may not be set yet */
 198         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 199                 struct ipu_client_platformdata *pdata = dev->platform_data;
 200
 201                 return pdata->of_node == np;
 202         }
 203
 204         /* Special case for LDB, one device for two channels */
 205         if (of_node_cmp(np->name, "lvds-channel") == 0) {
 206                 np = of_get_parent(np);
 207                 of_node_put(np);
 208         }
 209
 210         return dev->of_node == np;
 211 }
 212
 213 static int imx_drm_bind(struct device *dev)
 214 {
 215         struct drm_device *drm;
 216         int ret;
 217
 218         drm = drm_dev_alloc(&imx_drm_driver, dev);
 219         if (IS_ERR(drm))
 220                 return PTR_ERR(drm);
 221
 222         /*
 223          * enable drm irq mode.
 224          * - with irq_enabled = true, we can use the vblank feature.
 225          *
 226          * P.S. note that we wouldn't use drm irq handler but
 227          *      just specific driver own one instead because
 228          *      drm framework supports only one irq handler and
 229          *      drivers can well take care of their interrupts
 230          */
 231         drm->irq_enabled = true;
 232
 233         /*
 234          * set max width and height as default value(4096x4096).
 235          * this value would be used to check framebuffer size limitation
 236          * at drm_mode_addfb().
 237          */
 238         drm->mode_config.min_width = 1;
 239         drm->mode_config.min_height = 1;
 240         drm->mode_config.max_width = 4096;
 241         drm->mode_config.max_height = 4096;
 242         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 243         drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
 244         drm->mode_config.allow_fb_modifiers = true;
 245
 246         drm_mode_config_init(drm);
 247
 248         ret = drm_vblank_init(drm, MAX_CRTC);
 249         if (ret)
 250                 goto err_kms;
 251
 252         dev_set_drvdata(dev, drm);
 253
 254         /* Now try and bind all our sub-components */
 255         ret = component_bind_all(dev, drm);
 256         if (ret)
 257                 goto err_kms;
 258
 259         drm_mode_config_reset(drm);
 260
 261         /*
 262          * All components are now initialised, so setup the fb helper.
 263          * The fb helper takes copies of key hardware information, so the
 264          * crtcs/connectors/encoders must not change after this point.
 265          */
 266 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 267         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 268                 dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 269                 legacyfb_depth = 16;
 270         }
 271         ret = drm_fb_cma_fbdev_init(drm, legacyfb_depth, MAX_CRTC);
 272         if (ret)
 273                 goto err_unbind;
 274 #endif
 275
 276         drm_kms_helper_poll_init(drm);
 277
 278         ret = drm_dev_register(drm, 0);
 279         if (ret)
 280                 goto err_fbhelper;
 281
 282         return 0;
 283
 284 err_fbhelper:
 285         drm_kms_helper_poll_fini(drm);
 286 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 287         drm_fb_cma_fbdev_fini(drm);
 288 err_unbind:
 289 #endif
 290         component_unbind_all(drm->dev, drm);
 291 err_kms:
 292         drm_mode_config_cleanup(drm);
 293         drm_dev_put(drm);
 294
 295         return ret;
 296 }
 297
 298 static void imx_drm_unbind(struct device *dev)
 299 {
 300         struct drm_device *drm = dev_get_drvdata(dev);
 301
 302         drm_dev_unregister(drm);
 303
 304         drm_kms_helper_poll_fini(drm);
 305
 306         drm_fb_cma_fbdev_fini(drm);
 307
 308         drm_mode_config_cleanup(drm);
 309
 310         component_unbind_all(drm->dev, drm);
 311         dev_set_drvdata(dev, NULL);
 312
 313         drm_dev_put(drm);
 314 }
 315
 316 static const struct component_master_ops imx_drm_ops = {
 317         .bind = imx_drm_bind,
 318         .unbind = imx_drm_unbind,
 319 };
 320
 321 static int imx_drm_platform_probe(struct platform_device *pdev)
 322 {
 323         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 324
 325         if (!ret)
 326                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 327
 328         return ret;
 329 }
 330
 331 static int imx_drm_platform_remove(struct platform_device *pdev)
 332 {
 333         component_master_del(&pdev->dev, &imx_drm_ops);
 334         return 0;
 335 }
 336
 337 #ifdef CONFIG_PM_SLEEP
 338 static int imx_drm_suspend(struct device *dev)
 339 {
 340         struct drm_device *drm_dev = dev_get_drvdata(dev);
 341
 342         return drm_mode_config_helper_suspend(drm_dev);
 343 }
 344
 345 static int imx_drm_resume(struct device *dev)
 346 {
 347         struct drm_device *drm_dev = dev_get_drvdata(dev);
 348
 349         return drm_mode_config_helper_resume(drm_dev);
 350 }
 351 #endif
 352
 353 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 354
 355 static const struct of_device_id imx_drm_dt_ids[] = {
 356         { .compatible = "fsl,imx-display-subsystem", },
 357         { /* sentinel */ },
 358 };
 359 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 360
 361 static struct platform_driver imx_drm_pdrv = {
 362         .probe          = imx_drm_platform_probe,
 363         .remove         = imx_drm_platform_remove,
 364         .driver         = {
 365                 .name   = "imx-drm",
 366                 .pm     = &imx_drm_pm_ops,
 367                 .of_match_table = imx_drm_dt_ids,
 368         },
 369 };
 370
 371 static struct platform_driver * const drivers[] = {
 372         &imx_drm_pdrv,
 373         &ipu_drm_driver,
 374 };
 375
 376 static int __init imx_drm_init(void)
 377 {
 378         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 379 }
 380 module_init(imx_drm_init);
 381
 382 static void __exit imx_drm_exit(void)
 383 {
 384         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 385 }
 386 module_exit(imx_drm_exit);
 387
 388 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 389 MODULE_DESCRIPTION("i.MX drm driver core");
 390 MODULE_LICENSE("GPL");