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