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