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
  19 #include "komeda_dev.h"
  20 #include "komeda_framebuffer.h"
  21 #include "komeda_kms.h"
  22
  23 DEFINE_DRM_GEM_CMA_FOPS(komeda_cma_fops);
  24
  25 static int komeda_gem_cma_dumb_create(struct drm_file *file,
  26                                       struct drm_device *dev,
  27                                       struct drm_mode_create_dumb *args)
  28 {
  29         struct komeda_dev *mdev = dev->dev_private;
  30         u32 pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  31
  32         args->pitch = ALIGN(pitch, mdev->chip.bus_width);
  33
  34         return drm_gem_cma_dumb_create_internal(file, dev, args);
  35 }
  36
  37 static irqreturn_t komeda_kms_irq_handler(int irq, void *data)
  38 {
  39         struct drm_device *drm = data;
  40         struct komeda_dev *mdev = drm->dev_private;
  41         struct komeda_kms_dev *kms = to_kdev(drm);
  42         struct komeda_events evts;
  43         irqreturn_t status;
  44         u32 i;
  45
  46         /* Call into the CHIP to recognize events */
  47         memset(&evts, 0, sizeof(evts));
  48         status = mdev->funcs->irq_handler(mdev, &evts);
  49
  50         /* Notify the crtc to handle the events */
  51         for (i = 0; i < kms->n_crtcs; i++)
  52                 komeda_crtc_handle_event(&kms->crtcs[i], &evts);
  53
  54         return status;
  55 }
  56
  57 static struct drm_driver komeda_kms_driver = {
  58         .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC |
  59                            DRIVER_PRIME | DRIVER_HAVE_IRQ,
  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_export               = drm_gem_prime_export,
  67         .gem_prime_import               = drm_gem_prime_import,
  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_framebuffer *fb;
 150         struct drm_plane *plane;
 151         struct list_head zorder_list;
 152         int order = 0, err;
 153
 154         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
 155                          crtc->base.id, crtc->name);
 156
 157         INIT_LIST_HEAD(&zorder_list);
 158
 159         /* This loop also added all effected planes into the new state */
 160         drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) {
 161                 plane_st = drm_atomic_get_plane_state(state, plane);
 162                 if (IS_ERR(plane_st))
 163                         return PTR_ERR(plane_st);
 164
 165                 /* Build a list by zpos increasing */
 166                 err = komeda_plane_state_list_add(plane_st, &zorder_list);
 167                 if (err)
 168                         return err;
 169         }
 170
 171         kcrtc_st->max_slave_zorder = 0;
 172
 173         list_for_each_entry(kplane_st, &zorder_list, zlist_node) {
 174                 plane_st = &kplane_st->base;
 175                 fb = plane_st->fb;
 176                 plane = plane_st->plane;
 177
 178                 plane_st->normalized_zpos = order++;
 179                 /* When layer_split has been enabled, one plane will be handled
 180                  * by two separated komeda layers (left/right), which may needs
 181                  * two zorders.
 182                  * - zorder: for left_layer for left display part.
 183                  * - zorder + 1: will be reserved for right layer.
 184                  */
 185                 if (to_kplane_st(plane_st)->layer_split)
 186                         order++;
 187
 188                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n",
 189                                  plane->base.id, plane->name,
 190                                  plane_st->zpos, plane_st->normalized_zpos);
 191
 192                 /* calculate max slave zorder */
 193                 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes))
 194                         kcrtc_st->max_slave_zorder =
 195                                 max(plane_st->normalized_zpos,
 196                                     kcrtc_st->max_slave_zorder);
 197         }
 198
 199         crtc_st->zpos_changed = true;
 200
 201         return 0;
 202 }
 203
 204 static int komeda_kms_check(struct drm_device *dev,
 205                             struct drm_atomic_state *state)
 206 {
 207         struct drm_crtc *crtc;
 208         struct drm_crtc_state *old_crtc_st, *new_crtc_st;
 209         int i, err;
 210
 211         err = drm_atomic_helper_check_modeset(dev, state);
 212         if (err)
 213                 return err;
 214
 215         /* Komeda need to re-calculate resource assumption in every commit
 216          * so need to add all affected_planes (even unchanged) to
 217          * drm_atomic_state.
 218          */
 219         for_each_oldnew_crtc_in_state(state, crtc, old_crtc_st, new_crtc_st, i) {
 220                 err = drm_atomic_add_affected_planes(state, crtc);
 221                 if (err)
 222                         return err;
 223
 224                 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st);
 225                 if (err)
 226                         return err;
 227         }
 228
 229         err = drm_atomic_helper_check_planes(dev, state);
 230         if (err)
 231                 return err;
 232
 233         return 0;
 234 }
 235
 236 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
 237         .fb_create              = komeda_fb_create,
 238         .atomic_check           = komeda_kms_check,
 239         .atomic_commit          = drm_atomic_helper_commit,
 240 };
 241
 242 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
 243                                         struct komeda_dev *mdev)
 244 {
 245         struct drm_mode_config *config = &kms->base.mode_config;
 246
 247         drm_mode_config_init(&kms->base);
 248
 249         komeda_kms_setup_crtcs(kms, mdev);
 250
 251         /* Get value from dev */
 252         config->min_width       = 0;
 253         config->min_height      = 0;
 254         config->max_width       = 4096;
 255         config->max_height      = 4096;
 256         config->allow_fb_modifiers = true;
 257
 258         config->funcs = &komeda_mode_config_funcs;
 259         config->helper_private = &komeda_mode_config_helpers;
 260 }
 261
 262 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
 263 {
 264         struct komeda_kms_dev *kms = kzalloc(sizeof(*kms), GFP_KERNEL);
 265         struct drm_device *drm;
 266         int err;
 267
 268         if (!kms)
 269                 return ERR_PTR(-ENOMEM);
 270
 271         drm = &kms->base;
 272         err = drm_dev_init(drm, &komeda_kms_driver, mdev->dev);
 273         if (err)
 274                 goto free_kms;
 275
 276         drm->dev_private = mdev;
 277
 278         komeda_kms_mode_config_init(kms, mdev);
 279
 280         err = komeda_kms_add_private_objs(kms, mdev);
 281         if (err)
 282                 goto cleanup_mode_config;
 283
 284         err = komeda_kms_add_planes(kms, mdev);
 285         if (err)
 286                 goto cleanup_mode_config;
 287
 288         err = drm_vblank_init(drm, kms->n_crtcs);
 289         if (err)
 290                 goto cleanup_mode_config;
 291
 292         err = komeda_kms_add_crtcs(kms, mdev);
 293         if (err)
 294                 goto cleanup_mode_config;
 295
 296         err = komeda_kms_add_wb_connectors(kms, mdev);
 297         if (err)
 298                 goto cleanup_mode_config;
 299
 300         err = component_bind_all(mdev->dev, kms);
 301         if (err)
 302                 goto cleanup_mode_config;
 303
 304         drm_mode_config_reset(drm);
 305
 306         err = devm_request_irq(drm->dev, mdev->irq,
 307                                komeda_kms_irq_handler, IRQF_SHARED,
 308                                drm->driver->name, drm);
 309         if (err)
 310                 goto cleanup_mode_config;
 311
 312         err = mdev->funcs->enable_irq(mdev);
 313         if (err)
 314                 goto cleanup_mode_config;
 315
 316         drm->irq_enabled = true;
 317
 318         err = drm_dev_register(drm, 0);
 319         if (err)
 320                 goto cleanup_mode_config;
 321
 322         return kms;
 323
 324 cleanup_mode_config:
 325         drm->irq_enabled = false;
 326         drm_mode_config_cleanup(drm);
 327         komeda_kms_cleanup_private_objs(kms);
 328 free_kms:
 329         kfree(kms);
 330         return ERR_PTR(err);
 331 }
 332
 333 void komeda_kms_detach(struct komeda_kms_dev *kms)
 334 {
 335         struct drm_device *drm = &kms->base;
 336         struct komeda_dev *mdev = drm->dev_private;
 337
 338         drm->irq_enabled = false;
 339         mdev->funcs->disable_irq(mdev);
 340         drm_dev_unregister(drm);
 341         component_unbind_all(mdev->dev, drm);
 342         komeda_kms_cleanup_private_objs(kms);
 343         drm_mode_config_cleanup(drm);
 344         drm->dev_private = NULL;
 345         drm_dev_put(drm);
 346 }