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
   8 #include <linux/component.h>
   9 #include <linux/device.h>
  10 #include <linux/dma-buf.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13
  14 #include <video/imx-ipu-v3.h>
  15
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_drv.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_gem_cma_helper.h>
  22 #include <drm/drm_gem_framebuffer_helper.h>
  23 #include <drm/drm_of.h>
  24 #include <drm/drm_plane_helper.h>
  25 #include <drm/drm_probe_helper.h>
  26 #include <drm/drm_vblank.h>
  27
  28 #include "imx-drm.h"
  29 #include "ipuv3-plane.h"
  30
  31 #define MAX_CRTC        4
  32
  33 static int legacyfb_depth = 16;
  34 module_param(legacyfb_depth, int, 0444);
  35
  36 DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);
  37
  38 void imx_drm_connector_destroy(struct drm_connector *connector)
  39 {
  40         drm_connector_unregister(connector);
  41         drm_connector_cleanup(connector);
  42 }
  43 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
  44
  45 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
  46 {
  47         drm_encoder_cleanup(encoder);
  48 }
  49 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
  50
  51 static int imx_drm_atomic_check(struct drm_device *dev,
  52                                 struct drm_atomic_state *state)
  53 {
  54         int ret;
  55
  56         ret = drm_atomic_helper_check(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_ATOMIC,
 155         .gem_free_object_unlocked = drm_gem_cma_free_object,
 156         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 157         .dumb_create            = drm_gem_cma_dumb_create,
 158
 159         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 160         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 161         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 162         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 163         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 164         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 165         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 166         .ioctls                 = imx_drm_ioctls,
 167         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 168         .fops                   = &imx_drm_driver_fops,
 169         .name                   = "imx-drm",
 170         .desc                   = "i.MX DRM graphics",
 171         .date                   = "20120507",
 172         .major                  = 1,
 173         .minor                  = 0,
 174         .patchlevel             = 0,
 175 };
 176
 177 static int compare_of(struct device *dev, void *data)
 178 {
 179         struct device_node *np = data;
 180
 181         /* Special case for DI, dev->of_node may not be set yet */
 182         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 183                 struct ipu_client_platformdata *pdata = dev->platform_data;
 184
 185                 return pdata->of_node == np;
 186         }
 187
 188         /* Special case for LDB, one device for two channels */
 189         if (of_node_name_eq(np, "lvds-channel")) {
 190                 np = of_get_parent(np);
 191                 of_node_put(np);
 192         }
 193
 194         return dev->of_node == np;
 195 }
 196
 197 static int imx_drm_bind(struct device *dev)
 198 {
 199         struct drm_device *drm;
 200         int ret;
 201
 202         drm = drm_dev_alloc(&imx_drm_driver, dev);
 203         if (IS_ERR(drm))
 204                 return PTR_ERR(drm);
 205
 206         /*
 207          * enable drm irq mode.
 208          * - with irq_enabled = true, we can use the vblank feature.
 209          *
 210          * P.S. note that we wouldn't use drm irq handler but
 211          *      just specific driver own one instead because
 212          *      drm framework supports only one irq handler and
 213          *      drivers can well take care of their interrupts
 214          */
 215         drm->irq_enabled = true;
 216
 217         /*
 218          * set max width and height as default value(4096x4096).
 219          * this value would be used to check framebuffer size limitation
 220          * at drm_mode_addfb().
 221          */
 222         drm->mode_config.min_width = 1;
 223         drm->mode_config.min_height = 1;
 224         drm->mode_config.max_width = 4096;
 225         drm->mode_config.max_height = 4096;
 226         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 227         drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
 228         drm->mode_config.allow_fb_modifiers = true;
 229         drm->mode_config.normalize_zpos = true;
 230
 231         drm_mode_config_init(drm);
 232
 233         ret = drm_vblank_init(drm, MAX_CRTC);
 234         if (ret)
 235                 goto err_kms;
 236
 237         dev_set_drvdata(dev, drm);
 238
 239         /* Now try and bind all our sub-components */
 240         ret = component_bind_all(dev, drm);
 241         if (ret)
 242                 goto err_kms;
 243
 244         drm_mode_config_reset(drm);
 245
 246         /*
 247          * All components are now initialised, so setup the fb helper.
 248          * The fb helper takes copies of key hardware information, so the
 249          * crtcs/connectors/encoders must not change after this point.
 250          */
 251         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 252                 dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 253                 legacyfb_depth = 16;
 254         }
 255
 256         drm_kms_helper_poll_init(drm);
 257
 258         ret = drm_dev_register(drm, 0);
 259         if (ret)
 260                 goto err_poll_fini;
 261
 262         drm_fbdev_generic_setup(drm, legacyfb_depth);
 263
 264         return 0;
 265
 266 err_poll_fini:
 267         drm_kms_helper_poll_fini(drm);
 268         component_unbind_all(drm->dev, drm);
 269 err_kms:
 270         drm_mode_config_cleanup(drm);
 271         drm_dev_put(drm);
 272
 273         return ret;
 274 }
 275
 276 static void imx_drm_unbind(struct device *dev)
 277 {
 278         struct drm_device *drm = dev_get_drvdata(dev);
 279
 280         drm_dev_unregister(drm);
 281
 282         drm_kms_helper_poll_fini(drm);
 283
 284         drm_mode_config_cleanup(drm);
 285
 286         component_unbind_all(drm->dev, drm);
 287         dev_set_drvdata(dev, NULL);
 288
 289         drm_dev_put(drm);
 290 }
 291
 292 static const struct component_master_ops imx_drm_ops = {
 293         .bind = imx_drm_bind,
 294         .unbind = imx_drm_unbind,
 295 };
 296
 297 static int imx_drm_platform_probe(struct platform_device *pdev)
 298 {
 299         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 300
 301         if (!ret)
 302                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 303
 304         return ret;
 305 }
 306
 307 static int imx_drm_platform_remove(struct platform_device *pdev)
 308 {
 309         component_master_del(&pdev->dev, &imx_drm_ops);
 310         return 0;
 311 }
 312
 313 #ifdef CONFIG_PM_SLEEP
 314 static int imx_drm_suspend(struct device *dev)
 315 {
 316         struct drm_device *drm_dev = dev_get_drvdata(dev);
 317
 318         return drm_mode_config_helper_suspend(drm_dev);
 319 }
 320
 321 static int imx_drm_resume(struct device *dev)
 322 {
 323         struct drm_device *drm_dev = dev_get_drvdata(dev);
 324
 325         return drm_mode_config_helper_resume(drm_dev);
 326 }
 327 #endif
 328
 329 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 330
 331 static const struct of_device_id imx_drm_dt_ids[] = {
 332         { .compatible = "fsl,imx-display-subsystem", },
 333         { /* sentinel */ },
 334 };
 335 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 336
 337 static struct platform_driver imx_drm_pdrv = {
 338         .probe          = imx_drm_platform_probe,
 339         .remove         = imx_drm_platform_remove,
 340         .driver         = {
 341                 .name   = "imx-drm",
 342                 .pm     = &imx_drm_pm_ops,
 343                 .of_match_table = imx_drm_dt_ids,
 344         },
 345 };
 346
 347 static struct platform_driver * const drivers[] = {
 348         &imx_drm_pdrv,
 349         &ipu_drm_driver,
 350 };
 351
 352 static int __init imx_drm_init(void)
 353 {
 354         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 355 }
 356 module_init(imx_drm_init);
 357
 358 static void __exit imx_drm_exit(void)
 359 {
 360         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 361 }
 362 module_exit(imx_drm_exit);
 363
 364 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 365 MODULE_DESCRIPTION("i.MX drm driver core");
 366 MODULE_LICENSE("GPL");