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_ATOMIC,
 151         .gem_free_object_unlocked = drm_gem_cma_free_object,
 152         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 153         .dumb_create            = drm_gem_cma_dumb_create,
 154
 155         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 156         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 157         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 158         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 159         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 160         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 161         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 162         .ioctls                 = imx_drm_ioctls,
 163         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 164         .fops                   = &imx_drm_driver_fops,
 165         .name                   = "imx-drm",
 166         .desc                   = "i.MX DRM graphics",
 167         .date                   = "20120507",
 168         .major                  = 1,
 169         .minor                  = 0,
 170         .patchlevel             = 0,
 171 };
 172
 173 static int compare_of(struct device *dev, void *data)
 174 {
 175         struct device_node *np = data;
 176
 177         /* Special case for DI, dev->of_node may not be set yet */
 178         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 179                 struct ipu_client_platformdata *pdata = dev->platform_data;
 180
 181                 return pdata->of_node == np;
 182         }
 183
 184         /* Special case for LDB, one device for two channels */
 185         if (of_node_name_eq(np, "lvds-channel")) {
 186                 np = of_get_parent(np);
 187                 of_node_put(np);
 188         }
 189
 190         return dev->of_node == np;
 191 }
 192
 193 static int imx_drm_bind(struct device *dev)
 194 {
 195         struct drm_device *drm;
 196         int ret;
 197
 198         drm = drm_dev_alloc(&imx_drm_driver, dev);
 199         if (IS_ERR(drm))
 200                 return PTR_ERR(drm);
 201
 202         /*
 203          * enable drm irq mode.
 204          * - with irq_enabled = true, we can use the vblank feature.
 205          *
 206          * P.S. note that we wouldn't use drm irq handler but
 207          *      just specific driver own one instead because
 208          *      drm framework supports only one irq handler and
 209          *      drivers can well take care of their interrupts
 210          */
 211         drm->irq_enabled = true;
 212
 213         /*
 214          * set max width and height as default value(4096x4096).
 215          * this value would be used to check framebuffer size limitation
 216          * at drm_mode_addfb().
 217          */
 218         drm->mode_config.min_width = 1;
 219         drm->mode_config.min_height = 1;
 220         drm->mode_config.max_width = 4096;
 221         drm->mode_config.max_height = 4096;
 222         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 223         drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
 224         drm->mode_config.allow_fb_modifiers = true;
 225         drm->mode_config.normalize_zpos = true;
 226
 227         drm_mode_config_init(drm);
 228
 229         ret = drm_vblank_init(drm, MAX_CRTC);
 230         if (ret)
 231                 goto err_kms;
 232
 233         dev_set_drvdata(dev, drm);
 234
 235         /* Now try and bind all our sub-components */
 236         ret = component_bind_all(dev, drm);
 237         if (ret)
 238                 goto err_kms;
 239
 240         drm_mode_config_reset(drm);
 241
 242         /*
 243          * All components are now initialised, so setup the fb helper.
 244          * The fb helper takes copies of key hardware information, so the
 245          * crtcs/connectors/encoders must not change after this point.
 246          */
 247         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 248                 dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 249                 legacyfb_depth = 16;
 250         }
 251
 252         drm_kms_helper_poll_init(drm);
 253
 254         ret = drm_dev_register(drm, 0);
 255         if (ret)
 256                 goto err_poll_fini;
 257
 258         drm_fbdev_generic_setup(drm, legacyfb_depth);
 259
 260         return 0;
 261
 262 err_poll_fini:
 263         drm_kms_helper_poll_fini(drm);
 264         component_unbind_all(drm->dev, drm);
 265 err_kms:
 266         drm_mode_config_cleanup(drm);
 267         drm_dev_put(drm);
 268
 269         return ret;
 270 }
 271
 272 static void imx_drm_unbind(struct device *dev)
 273 {
 274         struct drm_device *drm = dev_get_drvdata(dev);
 275
 276         drm_dev_unregister(drm);
 277
 278         drm_kms_helper_poll_fini(drm);
 279
 280         drm_mode_config_cleanup(drm);
 281
 282         component_unbind_all(drm->dev, drm);
 283         dev_set_drvdata(dev, NULL);
 284
 285         drm_dev_put(drm);
 286 }
 287
 288 static const struct component_master_ops imx_drm_ops = {
 289         .bind = imx_drm_bind,
 290         .unbind = imx_drm_unbind,
 291 };
 292
 293 static int imx_drm_platform_probe(struct platform_device *pdev)
 294 {
 295         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 296
 297         if (!ret)
 298                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 299
 300         return ret;
 301 }
 302
 303 static int imx_drm_platform_remove(struct platform_device *pdev)
 304 {
 305         component_master_del(&pdev->dev, &imx_drm_ops);
 306         return 0;
 307 }
 308
 309 #ifdef CONFIG_PM_SLEEP
 310 static int imx_drm_suspend(struct device *dev)
 311 {
 312         struct drm_device *drm_dev = dev_get_drvdata(dev);
 313
 314         return drm_mode_config_helper_suspend(drm_dev);
 315 }
 316
 317 static int imx_drm_resume(struct device *dev)
 318 {
 319         struct drm_device *drm_dev = dev_get_drvdata(dev);
 320
 321         return drm_mode_config_helper_resume(drm_dev);
 322 }
 323 #endif
 324
 325 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 326
 327 static const struct of_device_id imx_drm_dt_ids[] = {
 328         { .compatible = "fsl,imx-display-subsystem", },
 329         { /* sentinel */ },
 330 };
 331 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 332
 333 static struct platform_driver imx_drm_pdrv = {
 334         .probe          = imx_drm_platform_probe,
 335         .remove         = imx_drm_platform_remove,
 336         .driver         = {
 337                 .name   = "imx-drm",
 338                 .pm     = &imx_drm_pm_ops,
 339                 .of_match_table = imx_drm_dt_ids,
 340         },
 341 };
 342
 343 static struct platform_driver * const drivers[] = {
 344         &imx_drm_pdrv,
 345         &ipu_drm_driver,
 346 };
 347
 348 static int __init imx_drm_init(void)
 349 {
 350         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 351 }
 352 module_init(imx_drm_init);
 353
 354 static void __exit imx_drm_exit(void)
 355 {
 356         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 357 }
 358 module_exit(imx_drm_exit);
 359
 360 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 361 MODULE_DESCRIPTION("i.MX drm driver core");
 362 MODULE_LICENSE("GPL");