drivers/gpu/drm/arm/display/komeda/komeda_kms.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
   4  * Author: James.Qian.Wang <james.qian.wang@arm.com>
   5  *
   6  */
   7 #include <linux/component.h>
   8 #include <linux/interrupt.h>
   9
  10 #include <drm/drm_atomic.h>
  11 #include <drm/drm_atomic_helper.h>
  12 #include <drm/drm_drv.h>
  13 #include <drm/drm_fb_helper.h>
  14 #include <drm/drm_gem_cma_helper.h>
  15 #include <drm/drm_gem_framebuffer_helper.h>
  16 #include <drm/drm_irq.h>
  17 #include <drm/drm_vblank.h>
  18 #include <drm/drm_probe_helper.h>
  19
  20 #include "komeda_dev.h"
  21 #include "komeda_framebuffer.h"
  22 #include "komeda_kms.h"
  23
  24 DEFINE_DRM_GEM_CMA_FOPS(komeda_cma_fops);
  25
  26 static int komeda_gem_cma_dumb_create(struct drm_file *file,
  27                                       struct drm_device *dev,
  28                                       struct drm_mode_create_dumb *args)
  29 {
  30         struct komeda_dev *mdev = dev->dev_private;
  31         u32 pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  32
  33         args->pitch = ALIGN(pitch, mdev->chip.bus_width);
  34
  35         return drm_gem_cma_dumb_create_internal(file, dev, args);
  36 }
  37
  38 static irqreturn_t komeda_kms_irq_handler(int irq, void *data)
  39 {
  40         struct drm_device *drm = data;
  41         struct komeda_dev *mdev = drm->dev_private;
  42         struct komeda_kms_dev *kms = to_kdev(drm);
  43         struct komeda_events evts;
  44         irqreturn_t status;
  45         u32 i;
  46
  47         /* Call into the CHIP to recognize events */
  48         memset(&evts, 0, sizeof(evts));
  49         status = mdev->funcs->irq_handler(mdev, &evts);
  50
  51         /* Notify the crtc to handle the events */
  52         for (i = 0; i < kms->n_crtcs; i++)
  53                 komeda_crtc_handle_event(&kms->crtcs[i], &evts);
  54
  55         return status;
  56 }
  57
  58 static struct drm_driver komeda_kms_driver = {
  59         .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC |
  60                            DRIVER_PRIME | DRIVER_HAVE_IRQ,
  61         .lastclose                      = drm_fb_helper_lastclose,
  62         .gem_free_object_unlocked       = drm_gem_cma_free_object,
  63         .gem_vm_ops                     = &drm_gem_cma_vm_ops,
  64         .dumb_create                    = komeda_gem_cma_dumb_create,
  65         .prime_handle_to_fd             = drm_gem_prime_handle_to_fd,
  66         .prime_fd_to_handle             = drm_gem_prime_fd_to_handle,
  67         .gem_prime_export               = drm_gem_prime_export,
  68         .gem_prime_import               = drm_gem_prime_import,
  69         .gem_prime_get_sg_table         = drm_gem_cma_prime_get_sg_table,
  70         .gem_prime_import_sg_table      = drm_gem_cma_prime_import_sg_table,
  71         .gem_prime_vmap                 = drm_gem_cma_prime_vmap,
  72         .gem_prime_vunmap               = drm_gem_cma_prime_vunmap,
  73         .gem_prime_mmap                 = drm_gem_cma_prime_mmap,
  74         .fops = &komeda_cma_fops,
  75         .name = "komeda",
  76         .desc = "Arm Komeda Display Processor driver",
  77         .date = "20181101",
  78         .major = 0,
  79         .minor = 1,
  80 };
  81
  82 static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
  83 {
  84         struct drm_device *dev = old_state->dev;
  85
  86         drm_atomic_helper_commit_modeset_disables(dev, old_state);
  87
  88         drm_atomic_helper_commit_planes(dev, old_state, 0);
  89
  90         drm_atomic_helper_commit_modeset_enables(dev, old_state);
  91
  92         drm_atomic_helper_wait_for_flip_done(dev, old_state);
  93
  94         drm_atomic_helper_commit_hw_done(old_state);
  95
  96         drm_atomic_helper_cleanup_planes(dev, old_state);
  97 }
  98
  99 static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
 100         .atomic_commit_tail = komeda_kms_commit_tail,
 101 };
 102
 103 static int komeda_plane_state_list_add(struct drm_plane_state *plane_st,
 104                                        struct list_head *zorder_list)
 105 {
 106         struct komeda_plane_state *new = to_kplane_st(plane_st);
 107         struct komeda_plane_state *node, *last;
 108
 109         last = list_empty(zorder_list) ?
 110                NULL : list_last_entry(zorder_list, typeof(*last), zlist_node);
 111
 112         /* Considering the list sequence is zpos increasing, so if list is empty
 113          * or the zpos of new node bigger than the last node in list, no need
 114          * loop and just insert the new one to the tail of the list.
 115          */
 116         if (!last || (new->base.zpos > last->base.zpos)) {
 117                 list_add_tail(&new->zlist_node, zorder_list);
 118                 return 0;
 119         }
 120
 121         /* Build the list by zpos increasing */
 122         list_for_each_entry(node, zorder_list, zlist_node) {
 123                 if (new->base.zpos < node->base.zpos) {
 124                         list_add_tail(&new->zlist_node, &node->zlist_node);
 125                         break;
 126                 } else if (node->base.zpos == new->base.zpos) {
 127                         struct drm_plane *a = node->base.plane;
 128                         struct drm_plane *b = new->base.plane;
 129
 130                         /* Komeda doesn't support setting a same zpos for
 131                          * different planes.
 132                          */
 133                         DRM_DEBUG_ATOMIC("PLANE: %s and PLANE: %s are configured same zpos: %d.\n",
 134                                          a->name, b->name, node->base.zpos);
 135                         return -EINVAL;
 136                 }
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int komeda_crtc_normalize_zpos(struct drm_crtc *crtc,
 143                                       struct drm_crtc_state *crtc_st)
 144 {
 145         struct drm_atomic_state *state = crtc_st->state;
 146         struct komeda_crtc *kcrtc = to_kcrtc(crtc);
 147         struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
 148         struct komeda_plane_state *kplane_st;
 149         struct drm_plane_state *plane_st;
 150         struct drm_framebuffer *fb;
 151         struct drm_plane *plane;
 152         struct list_head zorder_list;
 153         int order = 0, err;
 154
 155         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
 156                          crtc->base.id, crtc->name);
 157
 158         INIT_LIST_HEAD(&zorder_list);
 159
 160         /* This loop also added all effected planes into the new state */
 161         drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) {
 162                 plane_st = drm_atomic_get_plane_state(state, plane);
 163                 if (IS_ERR(plane_st))
 164                         return PTR_ERR(plane_st);
 165
 166                 /* Build a list by zpos increasing */
 167                 err = komeda_plane_state_list_add(plane_st, &zorder_list);
 168                 if (err)
 169                         return err;
 170         }
 171
 172         kcrtc_st->max_slave_zorder = 0;
 173
 174         list_for_each_entry(kplane_st, &zorder_list, zlist_node) {
 175                 plane_st = &kplane_st->base;
 176                 fb = plane_st->fb;
 177                 plane = plane_st->plane;
 178
 179                 plane_st->normalized_zpos = order++;
 180                 /* When layer_split has been enabled, one plane will be handled
 181                  * by two separated komeda layers (left/right), which may needs
 182                  * two zorders.
 183                  * - zorder: for left_layer for left display part.
 184                  * - zorder + 1: will be reserved for right layer.
 185                  */
 186                 if (to_kplane_st(plane_st)->layer_split)
 187                         order++;
 188
 189                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n",
 190                                  plane->base.id, plane->name,
 191                                  plane_st->zpos, plane_st->normalized_zpos);
 192
 193                 /* calculate max slave zorder */
 194                 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes))
 195                         kcrtc_st->max_slave_zorder =
 196                                 max(plane_st->normalized_zpos,
 197                                     kcrtc_st->max_slave_zorder);
 198         }
 199
 200         crtc_st->zpos_changed = true;
 201
 202         return 0;
 203 }
 204
 205 static int komeda_kms_check(struct drm_device *dev,
 206                             struct drm_atomic_state *state)
 207 {
 208         struct drm_crtc *crtc;
 209         struct drm_crtc_state *old_crtc_st, *new_crtc_st;
 210         int i, err;
 211
 212         err = drm_atomic_helper_check_modeset(dev, state);
 213         if (err)
 214                 return err;
 215
 216         /* Komeda need to re-calculate resource assumption in every commit
 217          * so need to add all affected_planes (even unchanged) to
 218          * drm_atomic_state.
 219          */
 220         for_each_oldnew_crtc_in_state(state, crtc, old_crtc_st, new_crtc_st, i) {
 221                 err = drm_atomic_add_affected_planes(state, crtc);
 222                 if (err)
 223                         return err;
 224
 225                 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st);
 226                 if (err)
 227                         return err;
 228         }
 229
 230         err = drm_atomic_helper_check_planes(dev, state);
 231         if (err)
 232                 return err;
 233
 234         return 0;
 235 }
 236
 237 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
 238         .fb_create              = komeda_fb_create,
 239         .atomic_check           = komeda_kms_check,
 240         .atomic_commit          = drm_atomic_helper_commit,
 241 };
 242
 243 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
 244                                         struct komeda_dev *mdev)
 245 {
 246         struct drm_mode_config *config = &kms->base.mode_config;
 247
 248         drm_mode_config_init(&kms->base);
 249
 250         komeda_kms_setup_crtcs(kms, mdev);
 251
 252         /* Get value from dev */
 253         config->min_width       = 0;
 254         config->min_height      = 0;
 255         config->max_width       = 4096;
 256         config->max_height      = 4096;
 257         config->allow_fb_modifiers = true;
 258
 259         config->funcs = &komeda_mode_config_funcs;
 260         config->helper_private = &komeda_mode_config_helpers;
 261 }
 262
 263 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
 264 {
 265         struct komeda_kms_dev *kms = kzalloc(sizeof(*kms), GFP_KERNEL);
 266         struct drm_device *drm;
 267         int err;
 268
 269         if (!kms)
 270                 return ERR_PTR(-ENOMEM);
 271
 272         drm = &kms->base;
 273         err = drm_dev_init(drm, &komeda_kms_driver, mdev->dev);
 274         if (err)
 275                 goto free_kms;
 276
 277         drm->dev_private = mdev;
 278
 279         komeda_kms_mode_config_init(kms, mdev);
 280
 281         err = komeda_kms_add_private_objs(kms, mdev);
 282         if (err)
 283                 goto cleanup_mode_config;
 284
 285         err = komeda_kms_add_planes(kms, mdev);
 286         if (err)
 287                 goto cleanup_mode_config;
 288
 289         err = drm_vblank_init(drm, kms->n_crtcs);
 290         if (err)
 291                 goto cleanup_mode_config;
 292
 293         err = komeda_kms_add_crtcs(kms, mdev);
 294         if (err)
 295                 goto cleanup_mode_config;
 296
 297         err = komeda_kms_add_wb_connectors(kms, mdev);
 298         if (err)
 299                 goto cleanup_mode_config;
 300
 301         err = component_bind_all(mdev->dev, kms);
 302         if (err)
 303                 goto cleanup_mode_config;
 304
 305         drm_mode_config_reset(drm);
 306
 307         err = devm_request_irq(drm->dev, mdev->irq,
 308                                komeda_kms_irq_handler, IRQF_SHARED,
 309                                drm->driver->name, drm);
 310         if (err)
 311                 goto cleanup_mode_config;
 312
 313         err = mdev->funcs->enable_irq(mdev);
 314         if (err)
 315                 goto cleanup_mode_config;
 316
 317         drm->irq_enabled = true;
 318
 319         drm_kms_helper_poll_init(drm);
 320
 321         err = drm_dev_register(drm, 0);
 322         if (err)
 323                 goto cleanup_mode_config;
 324
 325         return kms;
 326
 327 cleanup_mode_config:
 328         drm_kms_helper_poll_fini(drm);
 329         drm->irq_enabled = false;
 330         drm_mode_config_cleanup(drm);
 331         komeda_kms_cleanup_private_objs(kms);
 332 free_kms:
 333         kfree(kms);
 334         return ERR_PTR(err);
 335 }
 336
 337 void komeda_kms_detach(struct komeda_kms_dev *kms)
 338 {
 339         struct drm_device *drm = &kms->base;
 340         struct komeda_dev *mdev = drm->dev_private;
 341
 342         drm->irq_enabled = false;
 343         mdev->funcs->disable_irq(mdev);
 344         drm_dev_unregister(drm);
 345         drm_kms_helper_poll_fini(drm);
 346         component_unbind_all(mdev->dev, drm);
 347         komeda_kms_cleanup_private_objs(kms);
 348         drm_mode_config_cleanup(drm);
 349         drm->dev_private = NULL;
 350         drm_dev_put(drm);
 351 }