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 int imx_drm_dumb_create(struct drm_file *file_priv,
 149                                struct drm_device *drm,
 150                                struct drm_mode_create_dumb *args)
 151 {
 152         u32 width = args->width;
 153         int ret;
 154
 155         args->width = ALIGN(width, 8);
 156
 157         ret = drm_gem_cma_dumb_create(file_priv, drm, args);
 158         if (ret)
 159                 return ret;
 160
 161         args->width = width;
 162         return ret;
 163 }
 164
 165 static const struct drm_driver imx_drm_driver = {
 166         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 167         DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(imx_drm_dumb_create),
 168         .ioctls                 = imx_drm_ioctls,
 169         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 170         .fops                   = &imx_drm_driver_fops,
 171         .name                   = "imx-drm",
 172         .desc                   = "i.MX DRM graphics",
 173         .date                   = "20120507",
 174         .major                  = 1,
 175         .minor                  = 0,
 176         .patchlevel             = 0,
 177 };
 178
 179 static int compare_of(struct device *dev, void *data)
 180 {
 181         struct device_node *np = data;
 182
 183         /* Special case for DI, dev->of_node may not be set yet */
 184         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 185                 struct ipu_client_platformdata *pdata = dev->platform_data;
 186
 187                 return pdata->of_node == np;
 188         }
 189
 190         /* Special case for LDB, one device for two channels */
 191         if (of_node_name_eq(np, "lvds-channel")) {
 192                 np = of_get_parent(np);
 193                 of_node_put(np);
 194         }
 195
 196         return dev->of_node == np;
 197 }
 198
 199 static int imx_drm_bind(struct device *dev)
 200 {
 201         struct drm_device *drm;
 202         int ret;
 203
 204         drm = drm_dev_alloc(&imx_drm_driver, dev);
 205         if (IS_ERR(drm))
 206                 return PTR_ERR(drm);
 207
 208         /*
 209          * set max width and height as default value(4096x4096).
 210          * this value would be used to check framebuffer size limitation
 211          * at drm_mode_addfb().
 212          */
 213         drm->mode_config.min_width = 1;
 214         drm->mode_config.min_height = 1;
 215         drm->mode_config.max_width = 4096;
 216         drm->mode_config.max_height = 4096;
 217         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 218         drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
 219         drm->mode_config.normalize_zpos = true;
 220
 221         ret = drmm_mode_config_init(drm);
 222         if (ret)
 223                 goto err_kms;
 224
 225         ret = drm_vblank_init(drm, MAX_CRTC);
 226         if (ret)
 227                 goto err_kms;
 228
 229         dev_set_drvdata(dev, drm);
 230
 231         /* Now try and bind all our sub-components */
 232         ret = component_bind_all(dev, drm);
 233         if (ret)
 234                 goto err_kms;
 235
 236         drm_mode_config_reset(drm);
 237
 238         /*
 239          * All components are now initialised, so setup the fb helper.
 240          * The fb helper takes copies of key hardware information, so the
 241          * crtcs/connectors/encoders must not change after this point.
 242          */
 243         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 244                 dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 245                 legacyfb_depth = 16;
 246         }
 247
 248         drm_kms_helper_poll_init(drm);
 249
 250         ret = drm_dev_register(drm, 0);
 251         if (ret)
 252                 goto err_poll_fini;
 253
 254         drm_fbdev_generic_setup(drm, legacyfb_depth);
 255
 256         return 0;
 257
 258 err_poll_fini:
 259         drm_kms_helper_poll_fini(drm);
 260         component_unbind_all(drm->dev, drm);
 261 err_kms:
 262         drm_dev_put(drm);
 263
 264         return ret;
 265 }
 266
 267 static void imx_drm_unbind(struct device *dev)
 268 {
 269         struct drm_device *drm = dev_get_drvdata(dev);
 270
 271         drm_dev_unregister(drm);
 272
 273         drm_kms_helper_poll_fini(drm);
 274
 275         component_unbind_all(drm->dev, drm);
 276
 277         drm_dev_put(drm);
 278
 279         dev_set_drvdata(dev, NULL);
 280 }
 281
 282 static const struct component_master_ops imx_drm_ops = {
 283         .bind = imx_drm_bind,
 284         .unbind = imx_drm_unbind,
 285 };
 286
 287 static int imx_drm_platform_probe(struct platform_device *pdev)
 288 {
 289         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 290
 291         if (!ret)
 292                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 293
 294         return ret;
 295 }
 296
 297 static int imx_drm_platform_remove(struct platform_device *pdev)
 298 {
 299         component_master_del(&pdev->dev, &imx_drm_ops);
 300         return 0;
 301 }
 302
 303 #ifdef CONFIG_PM_SLEEP
 304 static int imx_drm_suspend(struct device *dev)
 305 {
 306         struct drm_device *drm_dev = dev_get_drvdata(dev);
 307
 308         return drm_mode_config_helper_suspend(drm_dev);
 309 }
 310
 311 static int imx_drm_resume(struct device *dev)
 312 {
 313         struct drm_device *drm_dev = dev_get_drvdata(dev);
 314
 315         return drm_mode_config_helper_resume(drm_dev);
 316 }
 317 #endif
 318
 319 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 320
 321 static const struct of_device_id imx_drm_dt_ids[] = {
 322         { .compatible = "fsl,imx-display-subsystem", },
 323         { /* sentinel */ },
 324 };
 325 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 326
 327 static struct platform_driver imx_drm_pdrv = {
 328         .probe          = imx_drm_platform_probe,
 329         .remove         = imx_drm_platform_remove,
 330         .driver         = {
 331                 .name   = "imx-drm",
 332                 .pm     = &imx_drm_pm_ops,
 333                 .of_match_table = imx_drm_dt_ids,
 334         },
 335 };
 336
 337 static struct platform_driver * const drivers[] = {
 338         &imx_drm_pdrv,
 339         &ipu_drm_driver,
 340 };
 341
 342 static int __init imx_drm_init(void)
 343 {
 344         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 345 }
 346 module_init(imx_drm_init);
 347
 348 static void __exit imx_drm_exit(void)
 349 {
 350         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 351 }
 352 module_exit(imx_drm_exit);
 353
 354 MODULE_AUTHOR("Sascha Hauer <[email protected]>");
 355 MODULE_DESCRIPTION("i.MX drm driver core");
 356 MODULE_LICENSE("GPL");