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