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

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Freescale i.MX drm driver
   4  *
   5  * Copyright (C) 2011 Sascha Hauer, Pengutronix
   6  */
   7 #include <linux/component.h>
   8 #include <linux/device.h>
   9 #include <linux/dma-buf.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <drm/drmP.h>
  13 #include <drm/drm_atomic.h>
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_fb_cma_helper.h>
  16 #include <drm/drm_fb_helper.h>
  17 #include <drm/drm_gem_cma_helper.h>
  18 #include <drm/drm_gem_framebuffer_helper.h>
  19 #include <drm/drm_of.h>
  20 #include <drm/drm_plane_helper.h>
  21 #include <drm/drm_probe_helper.h>
  22 #include <video/imx-ipu-v3.h>
  23
  24 #include "imx-drm.h"
  25 #include "ipuv3-plane.h"
  26
  27 #define MAX_CRTC        4
  28
  29 static int legacyfb_depth = 16;
  30 module_param(legacyfb_depth, int, 0444);
  31
  32 DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);
  33
  34 void imx_drm_connector_destroy(struct drm_connector *connector)
  35 {
  36         drm_connector_unregister(connector);
  37         drm_connector_cleanup(connector);
  38 }
  39 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
  40
  41 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
  42 {
  43         drm_encoder_cleanup(encoder);
  44 }
  45 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
  46
  47 static int imx_drm_atomic_check(struct drm_device *dev,
  48                                 struct drm_atomic_state *state)
  49 {
  50         int ret;
  51
  52         ret = drm_atomic_helper_check(dev, state);
  53         if (ret)
  54                 return ret;
  55
  56         /*
  57          * Check modeset again in case crtc_state->mode_changed is
  58          * updated in plane's ->atomic_check callback.
  59          */
  60         ret = drm_atomic_helper_check_modeset(dev, state);
  61         if (ret)
  62                 return ret;
  63
  64         /* Assign PRG/PRE channels and check if all constrains are satisfied. */
  65         ret = ipu_planes_assign_pre(dev, state);
  66         if (ret)
  67                 return ret;
  68
  69         return ret;
  70 }
  71
  72 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
  73         .fb_create = drm_gem_fb_create,
  74         .atomic_check = imx_drm_atomic_check,
  75         .atomic_commit = drm_atomic_helper_commit,
  76 };
  77
  78 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
  79 {
  80         struct drm_device *dev = state->dev;
  81         struct drm_plane *plane;
  82         struct drm_plane_state *old_plane_state, *new_plane_state;
  83         bool plane_disabling = false;
  84         int i;
  85
  86         drm_atomic_helper_commit_modeset_disables(dev, state);
  87
  88         drm_atomic_helper_commit_planes(dev, state,
  89                                 DRM_PLANE_COMMIT_ACTIVE_ONLY |
  90                                 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
  91
  92         drm_atomic_helper_commit_modeset_enables(dev, state);
  93
  94         for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
  95                 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
  96                         plane_disabling = true;
  97         }
  98
  99         /*
 100          * The flip done wait is only strictly required by imx-drm if a deferred
 101          * plane disable is in-flight. As the core requires blocking commits
 102          * to wait for the flip it is done here unconditionally. This keeps the
 103          * workitem around a bit longer than required for the majority of
 104          * non-blocking commits, but we accept that for the sake of simplicity.
 105          */
 106         drm_atomic_helper_wait_for_flip_done(dev, state);
 107
 108         if (plane_disabling) {
 109                 for_each_old_plane_in_state(state, plane, old_plane_state, i)
 110                         ipu_plane_disable_deferred(plane);
 111
 112         }
 113
 114         drm_atomic_helper_commit_hw_done(state);
 115 }
 116
 117 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
 118         .atomic_commit_tail = imx_drm_atomic_commit_tail,
 119 };
 120
 121
 122 int imx_drm_encoder_parse_of(struct drm_device *drm,
 123         struct drm_encoder *encoder, struct device_node *np)
 124 {
 125         uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
 126
 127         /*
 128          * If we failed to find the CRTC(s) which this encoder is
 129          * supposed to be connected to, it's because the CRTC has
 130          * not been registered yet.  Defer probing, and hope that
 131          * the required CRTC is added later.
 132          */
 133         if (crtc_mask == 0)
 134                 return -EPROBE_DEFER;
 135
 136         encoder->possible_crtcs = crtc_mask;
 137
 138         /* FIXME: this is the mask of outputs which can clone this output. */
 139         encoder->possible_clones = ~0;
 140
 141         return 0;
 142 }
 143 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 144
 145 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 146         /* none so far */
 147 };
 148
 149 static struct drm_driver imx_drm_driver = {
 150         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 151                                   DRIVER_ATOMIC,
 152         .gem_free_object_unlocked = drm_gem_cma_free_object,
 153         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 154         .dumb_create            = drm_gem_cma_dumb_create,
 155
 156         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 157         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 158         .gem_prime_import       = drm_gem_prime_import,
 159         .gem_prime_export       = drm_gem_prime_export,
 160         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 161         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 162         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 163         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 164         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 165         .ioctls                 = imx_drm_ioctls,
 166         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 167         .fops                   = &imx_drm_driver_fops,
 168         .name                   = "imx-drm",
 169         .desc                   = "i.MX DRM graphics",
 170         .date                   = "20120507",
 171         .major                  = 1,
 172         .minor                  = 0,
 173         .patchlevel             = 0,
 174 };
 175
 176 static int compare_of(struct device *dev, void *data)
 177 {
 178         struct device_node *np = data;
 179
 180         /* Special case for DI, dev->of_node may not be set yet */
 181         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 182                 struct ipu_client_platformdata *pdata = dev->platform_data;
 183
 184                 return pdata->of_node == np;
 185         }
 186
 187         /* Special case for LDB, one device for two channels */
 188         if (of_node_cmp(np->name, "lvds-channel") == 0) {
 189                 np = of_get_parent(np);
 190                 of_node_put(np);
 191         }
 192
 193         return dev->of_node == np;
 194 }
 195
 196 static int imx_drm_bind(struct device *dev)
 197 {
 198         struct drm_device *drm;
 199         int ret;
 200
 201         drm = drm_dev_alloc(&imx_drm_driver, dev);
 202         if (IS_ERR(drm))
 203                 return PTR_ERR(drm);
 204
 205         /*
 206          * enable drm irq mode.
 207          * - with irq_enabled = true, we can use the vblank feature.
 208          *
 209          * P.S. note that we wouldn't use drm irq handler but
 210          *      just specific driver own one instead because
 211          *      drm framework supports only one irq handler and
 212          *      drivers can well take care of their interrupts
 213          */
 214         drm->irq_enabled = true;
 215
 216         /*
 217          * set max width and height as default value(4096x4096).
 218          * this value would be used to check framebuffer size limitation
 219          * at drm_mode_addfb().
 220          */
 221         drm->mode_config.min_width = 1;
 222         drm->mode_config.min_height = 1;
 223         drm->mode_config.max_width = 4096;
 224         drm->mode_config.max_height = 4096;
 225         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 226         drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
 227         drm->mode_config.allow_fb_modifiers = true;
 228         drm->mode_config.normalize_zpos = true;
 229
 230         drm_mode_config_init(drm);
 231
 232         ret = drm_vblank_init(drm, MAX_CRTC);
 233         if (ret)
 234                 goto err_kms;
 235
 236         dev_set_drvdata(dev, drm);
 237
 238         /* Now try and bind all our sub-components */
 239         ret = component_bind_all(dev, drm);
 240         if (ret)
 241                 goto err_kms;
 242
 243         drm_mode_config_reset(drm);
 244
 245         /*
 246          * All components are now initialised, so setup the fb helper.
 247          * The fb helper takes copies of key hardware information, so the
 248          * crtcs/connectors/encoders must not change after this point.
 249          */
 250         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 251                 dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 252                 legacyfb_depth = 16;
 253         }
 254
 255         drm_kms_helper_poll_init(drm);
 256
 257         ret = drm_dev_register(drm, 0);
 258         if (ret)
 259                 goto err_poll_fini;
 260
 261         drm_fbdev_generic_setup(drm, legacyfb_depth);
 262
 263         return 0;
 264
 265 err_poll_fini:
 266         drm_kms_helper_poll_fini(drm);
 267         component_unbind_all(drm->dev, drm);
 268 err_kms:
 269         drm_mode_config_cleanup(drm);
 270         drm_dev_put(drm);
 271
 272         return ret;
 273 }
 274
 275 static void imx_drm_unbind(struct device *dev)
 276 {
 277         struct drm_device *drm = dev_get_drvdata(dev);
 278
 279         drm_dev_unregister(drm);
 280
 281         drm_kms_helper_poll_fini(drm);
 282
 283         drm_mode_config_cleanup(drm);
 284
 285         component_unbind_all(drm->dev, drm);
 286         dev_set_drvdata(dev, NULL);
 287
 288         drm_dev_put(drm);
 289 }
 290
 291 static const struct component_master_ops imx_drm_ops = {
 292         .bind = imx_drm_bind,
 293         .unbind = imx_drm_unbind,
 294 };
 295
 296 static int imx_drm_platform_probe(struct platform_device *pdev)
 297 {
 298         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 299
 300         if (!ret)
 301                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 302
 303         return ret;
 304 }
 305
 306 static int imx_drm_platform_remove(struct platform_device *pdev)
 307 {
 308         component_master_del(&pdev->dev, &imx_drm_ops);
 309         return 0;
 310 }
 311
 312 #ifdef CONFIG_PM_SLEEP
 313 static int imx_drm_suspend(struct device *dev)
 314 {
 315         struct drm_device *drm_dev = dev_get_drvdata(dev);
 316
 317         return drm_mode_config_helper_suspend(drm_dev);
 318 }
 319
 320 static int imx_drm_resume(struct device *dev)
 321 {
 322         struct drm_device *drm_dev = dev_get_drvdata(dev);
 323
 324         return drm_mode_config_helper_resume(drm_dev);
 325 }
 326 #endif
 327
 328 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 329
 330 static const struct of_device_id imx_drm_dt_ids[] = {
 331         { .compatible = "fsl,imx-display-subsystem", },
 332         { /* sentinel */ },
 333 };
 334 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 335
 336 static struct platform_driver imx_drm_pdrv = {
 337         .probe          = imx_drm_platform_probe,
 338         .remove         = imx_drm_platform_remove,
 339         .driver         = {
 340                 .name   = "imx-drm",
 341                 .pm     = &imx_drm_pm_ops,
 342                 .of_match_table = imx_drm_dt_ids,
 343         },
 344 };
 345
 346 static struct platform_driver * const drivers[] = {
 347         &imx_drm_pdrv,
 348         &ipu_drm_driver,
 349 };
 350
 351 static int __init imx_drm_init(void)
 352 {
 353         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 354 }
 355 module_init(imx_drm_init);
 356
 357 static void __exit imx_drm_exit(void)
 358 {
 359         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 360 }
 361 module_exit(imx_drm_exit);
 362
 363 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 364 MODULE_DESCRIPTION("i.MX drm driver core");
 365 MODULE_LICENSE("GPL");