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_managed.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_plane_helper.h>
  26 #include <drm/drm_probe_helper.h>
  27 #include <drm/drm_vblank.h>
  28
  29 #include "imx-drm.h"
  30 #include "ipuv3-plane.h"
  31
  32 #define MAX_CRTC        4
  33
  34 static int legacyfb_depth = 16;
  35 module_param(legacyfb_depth, int, 0444);
  36
  37 DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);
  38
  39 void imx_drm_connector_destroy(struct drm_connector *connector)
  40 {
  41         drm_connector_unregister(connector);
  42         drm_connector_cleanup(connector);
  43 }
  44 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
  45
  46 static int imx_drm_atomic_check(struct drm_device *dev,
  47                                 struct drm_atomic_state *state)
  48 {
  49         int ret;
  50
  51         ret = drm_atomic_helper_check(dev, state);
  52         if (ret)
  53                 return ret;
  54
  55         /*
  56          * Check modeset again in case crtc_state->mode_changed is
  57          * updated in plane's ->atomic_check callback.
  58          */
  59         ret = drm_atomic_helper_check_modeset(dev, state);
  60         if (ret)
  61                 return ret;
  62
  63         /* Assign PRG/PRE channels and check if all constrains are satisfied. */
  64         ret = ipu_planes_assign_pre(dev, state);
  65         if (ret)
  66                 return ret;
  67
  68         return ret;
  69 }
  70
  71 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
  72         .fb_create = drm_gem_fb_create,
  73         .atomic_check = imx_drm_atomic_check,
  74         .atomic_commit = drm_atomic_helper_commit,
  75 };
  76
  77 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
  78 {
  79         struct drm_device *dev = state->dev;
  80         struct drm_plane *plane;
  81         struct drm_plane_state *old_plane_state, *new_plane_state;
  82         bool plane_disabling = false;
  83         int i;
  84         bool fence_cookie = dma_fence_begin_signalling();
  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         dma_fence_end_signalling(fence_cookie);
 116 }
 117
 118 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
 119         .atomic_commit_tail = imx_drm_atomic_commit_tail,
 120 };
 121
 122
 123 int imx_drm_encoder_parse_of(struct drm_device *drm,
 124         struct drm_encoder *encoder, struct device_node *np)
 125 {
 126         uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
 127
 128         /*
 129          * If we failed to find the CRTC(s) which this encoder is
 130          * supposed to be connected to, it's because the CRTC has
 131          * not been registered yet.  Defer probing, and hope that
 132          * the required CRTC is added later.
 133          */
 134         if (crtc_mask == 0)
 135                 return -EPROBE_DEFER;
 136
 137         encoder->possible_crtcs = crtc_mask;
 138
 139         /* FIXME: cloning support not clear, disable it all for now */
 140         encoder->possible_clones = 0;
 141
 142         return 0;
 143 }
 144 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 145
 146 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 147         /* none so far */
 148 };
 149
 150 static int imx_drm_dumb_create(struct drm_file *file_priv,
 151                                struct drm_device *drm,
 152                                struct drm_mode_create_dumb *args)
 153 {
 154         u32 width = args->width;
 155         int ret;
 156
 157         args->width = ALIGN(width, 8);
 158
 159         ret = drm_gem_cma_dumb_create(file_priv, drm, args);
 160         if (ret)
 161                 return ret;
 162
 163         args->width = width;
 164         return ret;
 165 }
 166
 167 static const struct drm_driver imx_drm_driver = {
 168         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 169         DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(imx_drm_dumb_create),
 170         .ioctls                 = imx_drm_ioctls,
 171         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 172         .fops                   = &imx_drm_driver_fops,
 173         .name                   = "imx-drm",
 174         .desc                   = "i.MX DRM graphics",
 175         .date                   = "20120507",
 176         .major                  = 1,
 177         .minor                  = 0,
 178         .patchlevel             = 0,
 179 };
 180
 181 static int compare_of(struct device *dev, void *data)
 182 {
 183         struct device_node *np = data;
 184
 185         /* Special case for DI, dev->of_node may not be set yet */
 186         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 187                 struct ipu_client_platformdata *pdata = dev->platform_data;
 188
 189                 return pdata->of_node == np;
 190         }
 191
 192         /* Special case for LDB, one device for two channels */
 193         if (of_node_name_eq(np, "lvds-channel")) {
 194                 np = of_get_parent(np);
 195                 of_node_put(np);
 196         }
 197
 198         return dev->of_node == np;
 199 }
 200
 201 static int imx_drm_bind(struct device *dev)
 202 {
 203         struct drm_device *drm;
 204         int ret;
 205
 206         drm = drm_dev_alloc(&imx_drm_driver, dev);
 207         if (IS_ERR(drm))
 208                 return PTR_ERR(drm);
 209
 210         /*
 211          * enable drm irq mode.
 212          * - with irq_enabled = true, we can use the vblank feature.
 213          *
 214          * P.S. note that we wouldn't use drm irq handler but
 215          *      just specific driver own one instead because
 216          *      drm framework supports only one irq handler and
 217          *      drivers can well take care of their interrupts
 218          */
 219         drm->irq_enabled = true;
 220
 221         /*
 222          * set max width and height as default value(4096x4096).
 223          * this value would be used to check framebuffer size limitation
 224          * at drm_mode_addfb().
 225          */
 226         drm->mode_config.min_width = 1;
 227         drm->mode_config.min_height = 1;
 228         drm->mode_config.max_width = 4096;
 229         drm->mode_config.max_height = 4096;
 230         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 231         drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
 232         drm->mode_config.normalize_zpos = true;
 233
 234         ret = drmm_mode_config_init(drm);
 235         if (ret)
 236                 goto err_kms;
 237
 238         ret = drm_vblank_init(drm, MAX_CRTC);
 239         if (ret)
 240                 goto err_kms;
 241
 242         dev_set_drvdata(dev, drm);
 243
 244         /* Now try and bind all our sub-components */
 245         ret = component_bind_all(dev, drm);
 246         if (ret)
 247                 goto err_kms;
 248
 249         drm_mode_config_reset(drm);
 250
 251         /*
 252          * All components are now initialised, so setup the fb helper.
 253          * The fb helper takes copies of key hardware information, so the
 254          * crtcs/connectors/encoders must not change after this point.
 255          */
 256         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 257                 dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 258                 legacyfb_depth = 16;
 259         }
 260
 261         drm_kms_helper_poll_init(drm);
 262
 263         ret = drm_dev_register(drm, 0);
 264         if (ret)
 265                 goto err_poll_fini;
 266
 267         drm_fbdev_generic_setup(drm, legacyfb_depth);
 268
 269         return 0;
 270
 271 err_poll_fini:
 272         drm_kms_helper_poll_fini(drm);
 273         component_unbind_all(drm->dev, drm);
 274 err_kms:
 275         drm_dev_put(drm);
 276
 277         return ret;
 278 }
 279
 280 static void imx_drm_unbind(struct device *dev)
 281 {
 282         struct drm_device *drm = dev_get_drvdata(dev);
 283
 284         drm_dev_unregister(drm);
 285
 286         drm_kms_helper_poll_fini(drm);
 287
 288         component_unbind_all(drm->dev, drm);
 289
 290         drm_dev_put(drm);
 291
 292         dev_set_drvdata(dev, NULL);
 293 }
 294
 295 static const struct component_master_ops imx_drm_ops = {
 296         .bind = imx_drm_bind,
 297         .unbind = imx_drm_unbind,
 298 };
 299
 300 static int imx_drm_platform_probe(struct platform_device *pdev)
 301 {
 302         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 303
 304         if (!ret)
 305                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 306
 307         return ret;
 308 }
 309
 310 static int imx_drm_platform_remove(struct platform_device *pdev)
 311 {
 312         component_master_del(&pdev->dev, &imx_drm_ops);
 313         return 0;
 314 }
 315
 316 #ifdef CONFIG_PM_SLEEP
 317 static int imx_drm_suspend(struct device *dev)
 318 {
 319         struct drm_device *drm_dev = dev_get_drvdata(dev);
 320
 321         return drm_mode_config_helper_suspend(drm_dev);
 322 }
 323
 324 static int imx_drm_resume(struct device *dev)
 325 {
 326         struct drm_device *drm_dev = dev_get_drvdata(dev);
 327
 328         return drm_mode_config_helper_resume(drm_dev);
 329 }
 330 #endif
 331
 332 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 333
 334 static const struct of_device_id imx_drm_dt_ids[] = {
 335         { .compatible = "fsl,imx-display-subsystem", },
 336         { /* sentinel */ },
 337 };
 338 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 339
 340 static struct platform_driver imx_drm_pdrv = {
 341         .probe          = imx_drm_platform_probe,
 342         .remove         = imx_drm_platform_remove,
 343         .driver         = {
 344                 .name   = "imx-drm",
 345                 .pm     = &imx_drm_pm_ops,
 346                 .of_match_table = imx_drm_dt_ids,
 347         },
 348 };
 349
 350 static struct platform_driver * const drivers[] = {
 351         &imx_drm_pdrv,
 352         &ipu_drm_driver,
 353 };
 354
 355 static int __init imx_drm_init(void)
 356 {
 357         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 358 }
 359 module_init(imx_drm_init);
 360
 361 static void __exit imx_drm_exit(void)
 362 {
 363         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 364 }
 365 module_exit(imx_drm_exit);
 366
 367 MODULE_AUTHOR("Sascha Hauer <[email protected]>");
 368 MODULE_DESCRIPTION("i.MX drm driver core");
 369 MODULE_LICENSE("GPL");