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_probe_helper.h>
  18 #include <drm/drm_vblank.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         komeda_print_events(&evts);
  52
  53         /* Notify the crtc to handle the events */
  54         for (i = 0; i < kms->n_crtcs; i++)
  55                 komeda_crtc_handle_event(&kms->crtcs[i], &evts);
  56
  57         return status;
  58 }
  59
  60 static struct drm_driver komeda_kms_driver = {
  61         .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
  62         .lastclose                      = drm_fb_helper_lastclose,
  63         .gem_free_object_unlocked       = drm_gem_cma_free_object,
  64         .gem_vm_ops                     = &drm_gem_cma_vm_ops,
  65         .dumb_create                    = komeda_gem_cma_dumb_create,
  66         .prime_handle_to_fd             = drm_gem_prime_handle_to_fd,
  67         .prime_fd_to_handle             = drm_gem_prime_fd_to_handle,
  68         .gem_prime_get_sg_table         = drm_gem_cma_prime_get_sg_table,
  69         .gem_prime_import_sg_table      = drm_gem_cma_prime_import_sg_table,
  70         .gem_prime_vmap                 = drm_gem_cma_prime_vmap,
  71         .gem_prime_vunmap               = drm_gem_cma_prime_vunmap,
  72         .gem_prime_mmap                 = drm_gem_cma_prime_mmap,
  73         .fops = &komeda_cma_fops,
  74         .name = "komeda",
  75         .desc = "Arm Komeda Display Processor driver",
  76         .date = "20181101",
  77         .major = 0,
  78         .minor = 1,
  79 };
  80
  81 static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
  82 {
  83         struct drm_device *dev = old_state->dev;
  84
  85         drm_atomic_helper_commit_modeset_disables(dev, old_state);
  86
  87         drm_atomic_helper_commit_planes(dev, old_state, 0);
  88
  89         drm_atomic_helper_commit_modeset_enables(dev, old_state);
  90
  91         drm_atomic_helper_wait_for_flip_done(dev, old_state);
  92
  93         drm_atomic_helper_commit_hw_done(old_state);
  94
  95         drm_atomic_helper_cleanup_planes(dev, old_state);
  96 }
  97
  98 static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
  99         .atomic_commit_tail = komeda_kms_commit_tail,
 100 };
 101
 102 static int komeda_plane_state_list_add(struct drm_plane_state *plane_st,
 103                                        struct list_head *zorder_list)
 104 {
 105         struct komeda_plane_state *new = to_kplane_st(plane_st);
 106         struct komeda_plane_state *node, *last;
 107
 108         last = list_empty(zorder_list) ?
 109                NULL : list_last_entry(zorder_list, typeof(*last), zlist_node);
 110
 111         /* Considering the list sequence is zpos increasing, so if list is empty
 112          * or the zpos of new node bigger than the last node in list, no need
 113          * loop and just insert the new one to the tail of the list.
 114          */
 115         if (!last || (new->base.zpos > last->base.zpos)) {
 116                 list_add_tail(&new->zlist_node, zorder_list);
 117                 return 0;
 118         }
 119
 120         /* Build the list by zpos increasing */
 121         list_for_each_entry(node, zorder_list, zlist_node) {
 122                 if (new->base.zpos < node->base.zpos) {
 123                         list_add_tail(&new->zlist_node, &node->zlist_node);
 124                         break;
 125                 } else if (node->base.zpos == new->base.zpos) {
 126                         struct drm_plane *a = node->base.plane;
 127                         struct drm_plane *b = new->base.plane;
 128
 129                         /* Komeda doesn't support setting a same zpos for
 130                          * different planes.
 131                          */
 132                         DRM_DEBUG_ATOMIC("PLANE: %s and PLANE: %s are configured same zpos: %d.\n",
 133                                          a->name, b->name, node->base.zpos);
 134                         return -EINVAL;
 135                 }
 136         }
 137
 138         return 0;
 139 }
 140
 141 static int komeda_crtc_normalize_zpos(struct drm_crtc *crtc,
 142                                       struct drm_crtc_state *crtc_st)
 143 {
 144         struct drm_atomic_state *state = crtc_st->state;
 145         struct komeda_crtc *kcrtc = to_kcrtc(crtc);
 146         struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
 147         struct komeda_plane_state *kplane_st;
 148         struct drm_plane_state *plane_st;
 149         struct drm_plane *plane;
 150         struct list_head zorder_list;
 151         int order = 0, err;
 152
 153         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
 154                          crtc->base.id, crtc->name);
 155
 156         INIT_LIST_HEAD(&zorder_list);
 157
 158         /* This loop also added all effected planes into the new state */
 159         drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) {
 160                 plane_st = drm_atomic_get_plane_state(state, plane);
 161                 if (IS_ERR(plane_st))
 162                         return PTR_ERR(plane_st);
 163
 164                 /* Build a list by zpos increasing */
 165                 err = komeda_plane_state_list_add(plane_st, &zorder_list);
 166                 if (err)
 167                         return err;
 168         }
 169
 170         kcrtc_st->max_slave_zorder = 0;
 171
 172         list_for_each_entry(kplane_st, &zorder_list, zlist_node) {
 173                 plane_st = &kplane_st->base;
 174                 plane = plane_st->plane;
 175
 176                 plane_st->normalized_zpos = order++;
 177                 /* When layer_split has been enabled, one plane will be handled
 178                  * by two separated komeda layers (left/right), which may needs
 179                  * two zorders.
 180                  * - zorder: for left_layer for left display part.
 181                  * - zorder + 1: will be reserved for right layer.
 182                  */
 183                 if (to_kplane_st(plane_st)->layer_split)
 184                         order++;
 185
 186                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n",
 187                                  plane->base.id, plane->name,
 188                                  plane_st->zpos, plane_st->normalized_zpos);
 189
 190                 /* calculate max slave zorder */
 191                 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes))
 192                         kcrtc_st->max_slave_zorder =
 193                                 max(plane_st->normalized_zpos,
 194                                     kcrtc_st->max_slave_zorder);
 195         }
 196
 197         crtc_st->zpos_changed = true;
 198
 199         return 0;
 200 }
 201
 202 static int komeda_kms_check(struct drm_device *dev,
 203                             struct drm_atomic_state *state)
 204 {
 205         struct drm_crtc *crtc;
 206         struct drm_crtc_state *new_crtc_st;
 207         int i, err;
 208
 209         err = drm_atomic_helper_check_modeset(dev, state);
 210         if (err)
 211                 return err;
 212
 213         /* Komeda need to re-calculate resource assumption in every commit
 214          * so need to add all affected_planes (even unchanged) to
 215          * drm_atomic_state.
 216          */
 217         for_each_new_crtc_in_state(state, crtc, new_crtc_st, i) {
 218                 err = drm_atomic_add_affected_planes(state, crtc);
 219                 if (err)
 220                         return err;
 221
 222                 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st);
 223                 if (err)
 224                         return err;
 225         }
 226
 227         err = drm_atomic_helper_check_planes(dev, state);
 228         if (err)
 229                 return err;
 230
 231         return 0;
 232 }
 233
 234 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
 235         .fb_create              = komeda_fb_create,
 236         .atomic_check           = komeda_kms_check,
 237         .atomic_commit          = drm_atomic_helper_commit,
 238 };
 239
 240 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
 241                                         struct komeda_dev *mdev)
 242 {
 243         struct drm_mode_config *config = &kms->base.mode_config;
 244
 245         drm_mode_config_init(&kms->base);
 246
 247         komeda_kms_setup_crtcs(kms, mdev);
 248
 249         /* Get value from dev */
 250         config->min_width       = 0;
 251         config->min_height      = 0;
 252         config->max_width       = 4096;
 253         config->max_height      = 4096;
 254         config->allow_fb_modifiers = true;
 255
 256         config->funcs = &komeda_mode_config_funcs;
 257         config->helper_private = &komeda_mode_config_helpers;
 258 }
 259
 260 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
 261 {
 262         struct komeda_kms_dev *kms = kzalloc(sizeof(*kms), GFP_KERNEL);
 263         struct drm_device *drm;
 264         int err;
 265
 266         if (!kms)
 267                 return ERR_PTR(-ENOMEM);
 268
 269         drm = &kms->base;
 270         err = drm_dev_init(drm, &komeda_kms_driver, mdev->dev);
 271         if (err)
 272                 goto free_kms;
 273
 274         drm->dev_private = mdev;
 275
 276         komeda_kms_mode_config_init(kms, mdev);
 277
 278         err = komeda_kms_add_private_objs(kms, mdev);
 279         if (err)
 280                 goto cleanup_mode_config;
 281
 282         err = komeda_kms_add_planes(kms, mdev);
 283         if (err)
 284                 goto cleanup_mode_config;
 285
 286         err = drm_vblank_init(drm, kms->n_crtcs);
 287         if (err)
 288                 goto cleanup_mode_config;
 289
 290         err = komeda_kms_add_crtcs(kms, mdev);
 291         if (err)
 292                 goto cleanup_mode_config;
 293
 294         err = komeda_kms_add_wb_connectors(kms, mdev);
 295         if (err)
 296                 goto cleanup_mode_config;
 297
 298         err = component_bind_all(mdev->dev, kms);
 299         if (err)
 300                 goto cleanup_mode_config;
 301
 302         drm_mode_config_reset(drm);
 303
 304         err = devm_request_irq(drm->dev, mdev->irq,
 305                                komeda_kms_irq_handler, IRQF_SHARED,
 306                                drm->driver->name, drm);
 307         if (err)
 308                 goto free_component_binding;
 309
 310         err = mdev->funcs->enable_irq(mdev);
 311         if (err)
 312                 goto free_component_binding;
 313
 314         drm->irq_enabled = true;
 315
 316         drm_kms_helper_poll_init(drm);
 317
 318         err = drm_dev_register(drm, 0);
 319         if (err)
 320                 goto free_interrupts;
 321
 322         return kms;
 323
 324 free_interrupts:
 325         drm_kms_helper_poll_fini(drm);
 326         drm->irq_enabled = false;
 327         mdev->funcs->disable_irq(mdev);
 328 free_component_binding:
 329         component_unbind_all(mdev->dev, drm);
 330 cleanup_mode_config:
 331         drm_mode_config_cleanup(drm);
 332         komeda_kms_cleanup_private_objs(kms);
 333         drm->dev_private = NULL;
 334         drm_dev_put(drm);
 335 free_kms:
 336         kfree(kms);
 337         return ERR_PTR(err);
 338 }
 339
 340 void komeda_kms_detach(struct komeda_kms_dev *kms)
 341 {
 342         struct drm_device *drm = &kms->base;
 343         struct komeda_dev *mdev = drm->dev_private;
 344
 345         drm_dev_unregister(drm);
 346         drm_kms_helper_poll_fini(drm);
 347         drm_atomic_helper_shutdown(drm);
 348         drm->irq_enabled = false;
 349         mdev->funcs->disable_irq(mdev);
 350         component_unbind_all(mdev->dev, drm);
 351         drm_mode_config_cleanup(drm);
 352         komeda_kms_cleanup_private_objs(kms);
 353         drm->dev_private = NULL;
 354         drm_dev_put(drm);
 355 }