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 static int imx_drm_atomic_check(struct drm_device *dev,
  46                                 struct drm_atomic_state *state)
  47 {
  48         int ret;
  49
  50         ret = drm_atomic_helper_check(dev, state);
  51         if (ret)
  52                 return ret;
  53
  54         /*
  55          * Check modeset again in case crtc_state->mode_changed is
  56          * updated in plane's ->atomic_check callback.
  57          */
  58         ret = drm_atomic_helper_check_modeset(dev, state);
  59         if (ret)
  60                 return ret;
  61
  62         /* Assign PRG/PRE channels and check if all constrains are satisfied. */
  63         ret = ipu_planes_assign_pre(dev, state);
  64         if (ret)
  65                 return ret;
  66
  67         return ret;
  68 }
  69
  70 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
  71         .fb_create = drm_gem_fb_create,
  72         .atomic_check = imx_drm_atomic_check,
  73         .atomic_commit = drm_atomic_helper_commit,
  74 };
  75
  76 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
  77 {
  78         struct drm_device *dev = state->dev;
  79         struct drm_plane *plane;
  80         struct drm_plane_state *old_plane_state, *new_plane_state;
  81         bool plane_disabling = false;
  82         int i;
  83
  84         drm_atomic_helper_commit_modeset_disables(dev, state);
  85
  86         drm_atomic_helper_commit_planes(dev, state,
  87                                 DRM_PLANE_COMMIT_ACTIVE_ONLY |
  88                                 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
  89
  90         drm_atomic_helper_commit_modeset_enables(dev, state);
  91
  92         for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
  93                 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
  94                         plane_disabling = true;
  95         }
  96
  97         /*
  98          * The flip done wait is only strictly required by imx-drm if a deferred
  99          * plane disable is in-flight. As the core requires blocking commits
 100          * to wait for the flip it is done here unconditionally. This keeps the
 101          * workitem around a bit longer than required for the majority of
 102          * non-blocking commits, but we accept that for the sake of simplicity.
 103          */
 104         drm_atomic_helper_wait_for_flip_done(dev, state);
 105
 106         if (plane_disabling) {
 107                 for_each_old_plane_in_state(state, plane, old_plane_state, i)
 108                         ipu_plane_disable_deferred(plane);
 109
 110         }
 111
 112         drm_atomic_helper_commit_hw_done(state);
 113 }
 114
 115 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
 116         .atomic_commit_tail = imx_drm_atomic_commit_tail,
 117 };
 118
 119
 120 int imx_drm_encoder_parse_of(struct drm_device *drm,
 121         struct drm_encoder *encoder, struct device_node *np)
 122 {
 123         uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
 124
 125         /*
 126          * If we failed to find the CRTC(s) which this encoder is
 127          * supposed to be connected to, it's because the CRTC has
 128          * not been registered yet.  Defer probing, and hope that
 129          * the required CRTC is added later.
 130          */
 131         if (crtc_mask == 0)
 132                 return -EPROBE_DEFER;
 133
 134         encoder->possible_crtcs = crtc_mask;
 135
 136         /* FIXME: cloning support not clear, disable it all for now */
 137         encoder->possible_clones = 0;
 138
 139         return 0;
 140 }
 141 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 142
 143 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 144         /* none so far */
 145 };
 146
 147 static struct drm_driver imx_drm_driver = {
 148         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 149         DRM_GEM_CMA_DRIVER_OPS,
 150         .ioctls                 = imx_drm_ioctls,
 151         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 152         .fops                   = &imx_drm_driver_fops,
 153         .name                   = "imx-drm",
 154         .desc                   = "i.MX DRM graphics",
 155         .date                   = "20120507",
 156         .major                  = 1,
 157         .minor                  = 0,
 158         .patchlevel             = 0,
 159 };
 160
 161 static int compare_of(struct device *dev, void *data)
 162 {
 163         struct device_node *np = data;
 164
 165         /* Special case for DI, dev->of_node may not be set yet */
 166         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 167                 struct ipu_client_platformdata *pdata = dev->platform_data;
 168
 169                 return pdata->of_node == np;
 170         }
 171
 172         /* Special case for LDB, one device for two channels */
 173         if (of_node_name_eq(np, "lvds-channel")) {
 174                 np = of_get_parent(np);
 175                 of_node_put(np);
 176         }
 177
 178         return dev->of_node == np;
 179 }
 180
 181 static int imx_drm_bind(struct device *dev)
 182 {
 183         struct drm_device *drm;
 184         int ret;
 185
 186         drm = drm_dev_alloc(&imx_drm_driver, dev);
 187         if (IS_ERR(drm))
 188                 return PTR_ERR(drm);
 189
 190         /*
 191          * enable drm irq mode.
 192          * - with irq_enabled = true, we can use the vblank feature.
 193          *
 194          * P.S. note that we wouldn't use drm irq handler but
 195          *      just specific driver own one instead because
 196          *      drm framework supports only one irq handler and
 197          *      drivers can well take care of their interrupts
 198          */
 199         drm->irq_enabled = true;
 200
 201         /*
 202          * set max width and height as default value(4096x4096).
 203          * this value would be used to check framebuffer size limitation
 204          * at drm_mode_addfb().
 205          */
 206         drm->mode_config.min_width = 1;
 207         drm->mode_config.min_height = 1;
 208         drm->mode_config.max_width = 4096;
 209         drm->mode_config.max_height = 4096;
 210         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 211         drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
 212         drm->mode_config.allow_fb_modifiers = true;
 213         drm->mode_config.normalize_zpos = true;
 214
 215         drm_mode_config_init(drm);
 216
 217         ret = drm_vblank_init(drm, MAX_CRTC);
 218         if (ret)
 219                 goto err_kms;
 220
 221         dev_set_drvdata(dev, drm);
 222
 223         /* Now try and bind all our sub-components */
 224         ret = component_bind_all(dev, drm);
 225         if (ret)
 226                 goto err_kms;
 227
 228         drm_mode_config_reset(drm);
 229
 230         /*
 231          * All components are now initialised, so setup the fb helper.
 232          * The fb helper takes copies of key hardware information, so the
 233          * crtcs/connectors/encoders must not change after this point.
 234          */
 235         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 236                 dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 237                 legacyfb_depth = 16;
 238         }
 239
 240         drm_kms_helper_poll_init(drm);
 241
 242         ret = drm_dev_register(drm, 0);
 243         if (ret)
 244                 goto err_poll_fini;
 245
 246         drm_fbdev_generic_setup(drm, legacyfb_depth);
 247
 248         return 0;
 249
 250 err_poll_fini:
 251         drm_kms_helper_poll_fini(drm);
 252         component_unbind_all(drm->dev, drm);
 253 err_kms:
 254         drm_mode_config_cleanup(drm);
 255         drm_dev_put(drm);
 256
 257         return ret;
 258 }
 259
 260 static void imx_drm_unbind(struct device *dev)
 261 {
 262         struct drm_device *drm = dev_get_drvdata(dev);
 263
 264         drm_dev_unregister(drm);
 265
 266         drm_kms_helper_poll_fini(drm);
 267
 268         component_unbind_all(drm->dev, drm);
 269
 270         drm_mode_config_cleanup(drm);
 271
 272         dev_set_drvdata(dev, NULL);
 273
 274         drm_dev_put(drm);
 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");