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