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, drm);
  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,
  88                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
  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_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                 plane = plane_st->plane;
 176
 177                 plane_st->normalized_zpos = order++;
 178                 /* When layer_split has been enabled, one plane will be handled
 179                  * by two separated komeda layers (left/right), which may needs
 180                  * two zorders.
 181                  * - zorder: for left_layer for left display part.
 182                  * - zorder + 1: will be reserved for right layer.
 183                  */
 184                 if (to_kplane_st(plane_st)->layer_split)
 185                         order++;
 186
 187                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n",
 188                                  plane->base.id, plane->name,
 189                                  plane_st->zpos, plane_st->normalized_zpos);
 190
 191                 /* calculate max slave zorder */
 192                 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes))
 193                         kcrtc_st->max_slave_zorder =
 194                                 max(plane_st->normalized_zpos,
 195                                     kcrtc_st->max_slave_zorder);
 196         }
 197
 198         crtc_st->zpos_changed = true;
 199
 200         return 0;
 201 }
 202
 203 static int komeda_kms_check(struct drm_device *dev,
 204                             struct drm_atomic_state *state)
 205 {
 206         struct drm_crtc *crtc;
 207         struct drm_crtc_state *new_crtc_st;
 208         int i, err;
 209
 210         err = drm_atomic_helper_check_modeset(dev, state);
 211         if (err)
 212                 return err;
 213
 214         /* Komeda need to re-calculate resource assumption in every commit
 215          * so need to add all affected_planes (even unchanged) to
 216          * drm_atomic_state.
 217          */
 218         for_each_new_crtc_in_state(state, crtc, new_crtc_st, i) {
 219                 err = drm_atomic_add_affected_planes(state, crtc);
 220                 if (err)
 221                         return err;
 222
 223                 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st);
 224                 if (err)
 225                         return err;
 226         }
 227
 228         err = drm_atomic_helper_check_planes(dev, state);
 229         if (err)
 230                 return err;
 231
 232         return 0;
 233 }
 234
 235 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
 236         .fb_create              = komeda_fb_create,
 237         .atomic_check           = komeda_kms_check,
 238         .atomic_commit          = drm_atomic_helper_commit,
 239 };
 240
 241 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
 242                                         struct komeda_dev *mdev)
 243 {
 244         struct drm_mode_config *config = &kms->base.mode_config;
 245
 246         drm_mode_config_init(&kms->base);
 247
 248         komeda_kms_setup_crtcs(kms, mdev);
 249
 250         /* Get value from dev */
 251         config->min_width       = 0;
 252         config->min_height      = 0;
 253         config->max_width       = 4096;
 254         config->max_height      = 4096;
 255         config->allow_fb_modifiers = true;
 256
 257         config->funcs = &komeda_mode_config_funcs;
 258         config->helper_private = &komeda_mode_config_helpers;
 259 }
 260
 261 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
 262 {
 263         struct komeda_kms_dev *kms = kzalloc(sizeof(*kms), GFP_KERNEL);
 264         struct drm_device *drm;
 265         int err;
 266
 267         if (!kms)
 268                 return ERR_PTR(-ENOMEM);
 269
 270         drm = &kms->base;
 271         err = drm_dev_init(drm, &komeda_kms_driver, mdev->dev);
 272         if (err)
 273                 goto free_kms;
 274
 275         drm->dev_private = mdev;
 276
 277         komeda_kms_mode_config_init(kms, mdev);
 278
 279         err = komeda_kms_add_private_objs(kms, mdev);
 280         if (err)
 281                 goto cleanup_mode_config;
 282
 283         err = komeda_kms_add_planes(kms, mdev);
 284         if (err)
 285                 goto cleanup_mode_config;
 286
 287         err = drm_vblank_init(drm, kms->n_crtcs);
 288         if (err)
 289                 goto cleanup_mode_config;
 290
 291         err = komeda_kms_add_crtcs(kms, mdev);
 292         if (err)
 293                 goto cleanup_mode_config;
 294
 295         err = komeda_kms_add_wb_connectors(kms, mdev);
 296         if (err)
 297                 goto cleanup_mode_config;
 298
 299         err = component_bind_all(mdev->dev, kms);
 300         if (err)
 301                 goto cleanup_mode_config;
 302
 303         drm_mode_config_reset(drm);
 304
 305         err = devm_request_irq(drm->dev, mdev->irq,
 306                                komeda_kms_irq_handler, IRQF_SHARED,
 307                                drm->driver->name, drm);
 308         if (err)
 309                 goto free_component_binding;
 310
 311         drm->irq_enabled = true;
 312
 313         drm_kms_helper_poll_init(drm);
 314
 315         err = drm_dev_register(drm, 0);
 316         if (err)
 317                 goto free_interrupts;
 318
 319         return kms;
 320
 321 free_interrupts:
 322         drm_kms_helper_poll_fini(drm);
 323         drm->irq_enabled = false;
 324 free_component_binding:
 325         component_unbind_all(mdev->dev, drm);
 326 cleanup_mode_config:
 327         drm_mode_config_cleanup(drm);
 328         komeda_kms_cleanup_private_objs(kms);
 329         drm->dev_private = NULL;
 330         drm_dev_put(drm);
 331 free_kms:
 332         kfree(kms);
 333         return ERR_PTR(err);
 334 }
 335
 336 void komeda_kms_detach(struct komeda_kms_dev *kms)
 337 {
 338         struct drm_device *drm = &kms->base;
 339         struct komeda_dev *mdev = drm->dev_private;
 340
 341         drm_dev_unregister(drm);
 342         drm_kms_helper_poll_fini(drm);
 343         drm_atomic_helper_shutdown(drm);
 344         drm->irq_enabled = false;
 345         component_unbind_all(mdev->dev, drm);
 346         drm_mode_config_cleanup(drm);
 347         komeda_kms_cleanup_private_objs(kms);
 348         drm->dev_private = NULL;
 349         drm_dev_put(drm);
 350 }