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_managed.h>
  18 #include <drm/drm_probe_helper.h>
  19 #include <drm/drm_vblank.h>
  20
  21 #include "komeda_dev.h"
  22 #include "komeda_framebuffer.h"
  23 #include "komeda_kms.h"
  24
  25 DEFINE_DRM_GEM_CMA_FOPS(komeda_cma_fops);
  26
  27 static int komeda_gem_cma_dumb_create(struct drm_file *file,
  28                                       struct drm_device *dev,
  29                                       struct drm_mode_create_dumb *args)
  30 {
  31         struct komeda_dev *mdev = dev->dev_private;
  32         u32 pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  33
  34         args->pitch = ALIGN(pitch, mdev->chip.bus_width);
  35
  36         return drm_gem_cma_dumb_create_internal(file, dev, args);
  37 }
  38
  39 static irqreturn_t komeda_kms_irq_handler(int irq, void *data)
  40 {
  41         struct drm_device *drm = data;
  42         struct komeda_dev *mdev = drm->dev_private;
  43         struct komeda_kms_dev *kms = to_kdev(drm);
  44         struct komeda_events evts;
  45         irqreturn_t status;
  46         u32 i;
  47
  48         /* Call into the CHIP to recognize events */
  49         memset(&evts, 0, sizeof(evts));
  50         status = mdev->funcs->irq_handler(mdev, &evts);
  51
  52         komeda_print_events(&evts, drm);
  53
  54         /* Notify the crtc to handle the events */
  55         for (i = 0; i < kms->n_crtcs; i++)
  56                 komeda_crtc_handle_event(&kms->crtcs[i], &evts);
  57
  58         return status;
  59 }
  60
  61 static const struct drm_driver komeda_kms_driver = {
  62         .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
  63         .lastclose                      = drm_fb_helper_lastclose,
  64         DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(komeda_gem_cma_dumb_create),
  65         .fops = &komeda_cma_fops,
  66         .name = "komeda",
  67         .desc = "Arm Komeda Display Processor driver",
  68         .date = "20181101",
  69         .major = 0,
  70         .minor = 1,
  71 };
  72
  73 static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
  74 {
  75         struct drm_device *dev = old_state->dev;
  76
  77         drm_atomic_helper_commit_modeset_disables(dev, old_state);
  78
  79         drm_atomic_helper_commit_planes(dev, old_state,
  80                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
  81
  82         drm_atomic_helper_commit_modeset_enables(dev, old_state);
  83
  84         drm_atomic_helper_wait_for_flip_done(dev, old_state);
  85
  86         drm_atomic_helper_commit_hw_done(old_state);
  87
  88         drm_atomic_helper_cleanup_planes(dev, old_state);
  89 }
  90
  91 static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
  92         .atomic_commit_tail = komeda_kms_commit_tail,
  93 };
  94
  95 static int komeda_plane_state_list_add(struct drm_plane_state *plane_st,
  96                                        struct list_head *zorder_list)
  97 {
  98         struct komeda_plane_state *new = to_kplane_st(plane_st);
  99         struct komeda_plane_state *node, *last;
 100
 101         last = list_empty(zorder_list) ?
 102                NULL : list_last_entry(zorder_list, typeof(*last), zlist_node);
 103
 104         /* Considering the list sequence is zpos increasing, so if list is empty
 105          * or the zpos of new node bigger than the last node in list, no need
 106          * loop and just insert the new one to the tail of the list.
 107          */
 108         if (!last || (new->base.zpos > last->base.zpos)) {
 109                 list_add_tail(&new->zlist_node, zorder_list);
 110                 return 0;
 111         }
 112
 113         /* Build the list by zpos increasing */
 114         list_for_each_entry(node, zorder_list, zlist_node) {
 115                 if (new->base.zpos < node->base.zpos) {
 116                         list_add_tail(&new->zlist_node, &node->zlist_node);
 117                         break;
 118                 } else if (node->base.zpos == new->base.zpos) {
 119                         struct drm_plane *a = node->base.plane;
 120                         struct drm_plane *b = new->base.plane;
 121
 122                         /* Komeda doesn't support setting a same zpos for
 123                          * different planes.
 124                          */
 125                         DRM_DEBUG_ATOMIC("PLANE: %s and PLANE: %s are configured same zpos: %d.\n",
 126                                          a->name, b->name, node->base.zpos);
 127                         return -EINVAL;
 128                 }
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int komeda_crtc_normalize_zpos(struct drm_crtc *crtc,
 135                                       struct drm_crtc_state *crtc_st)
 136 {
 137         struct drm_atomic_state *state = crtc_st->state;
 138         struct komeda_crtc *kcrtc = to_kcrtc(crtc);
 139         struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
 140         struct komeda_plane_state *kplane_st;
 141         struct drm_plane_state *plane_st;
 142         struct drm_plane *plane;
 143         struct list_head zorder_list;
 144         int order = 0, err;
 145
 146         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
 147                          crtc->base.id, crtc->name);
 148
 149         INIT_LIST_HEAD(&zorder_list);
 150
 151         /* This loop also added all effected planes into the new state */
 152         drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) {
 153                 plane_st = drm_atomic_get_plane_state(state, plane);
 154                 if (IS_ERR(plane_st))
 155                         return PTR_ERR(plane_st);
 156
 157                 /* Build a list by zpos increasing */
 158                 err = komeda_plane_state_list_add(plane_st, &zorder_list);
 159                 if (err)
 160                         return err;
 161         }
 162
 163         kcrtc_st->max_slave_zorder = 0;
 164
 165         list_for_each_entry(kplane_st, &zorder_list, zlist_node) {
 166                 plane_st = &kplane_st->base;
 167                 plane = plane_st->plane;
 168
 169                 plane_st->normalized_zpos = order++;
 170                 /* When layer_split has been enabled, one plane will be handled
 171                  * by two separated komeda layers (left/right), which may needs
 172                  * two zorders.
 173                  * - zorder: for left_layer for left display part.
 174                  * - zorder + 1: will be reserved for right layer.
 175                  */
 176                 if (to_kplane_st(plane_st)->layer_split)
 177                         order++;
 178
 179                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n",
 180                                  plane->base.id, plane->name,
 181                                  plane_st->zpos, plane_st->normalized_zpos);
 182
 183                 /* calculate max slave zorder */
 184                 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes))
 185                         kcrtc_st->max_slave_zorder =
 186                                 max(plane_st->normalized_zpos,
 187                                     kcrtc_st->max_slave_zorder);
 188         }
 189
 190         crtc_st->zpos_changed = true;
 191
 192         return 0;
 193 }
 194
 195 static int komeda_kms_check(struct drm_device *dev,
 196                             struct drm_atomic_state *state)
 197 {
 198         struct drm_crtc *crtc;
 199         struct drm_crtc_state *new_crtc_st;
 200         int i, err;
 201
 202         err = drm_atomic_helper_check_modeset(dev, state);
 203         if (err)
 204                 return err;
 205
 206         /* Komeda need to re-calculate resource assumption in every commit
 207          * so need to add all affected_planes (even unchanged) to
 208          * drm_atomic_state.
 209          */
 210         for_each_new_crtc_in_state(state, crtc, new_crtc_st, i) {
 211                 err = drm_atomic_add_affected_planes(state, crtc);
 212                 if (err)
 213                         return err;
 214
 215                 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st);
 216                 if (err)
 217                         return err;
 218         }
 219
 220         err = drm_atomic_helper_check_planes(dev, state);
 221         if (err)
 222                 return err;
 223
 224         return 0;
 225 }
 226
 227 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
 228         .fb_create              = komeda_fb_create,
 229         .atomic_check           = komeda_kms_check,
 230         .atomic_commit          = drm_atomic_helper_commit,
 231 };
 232
 233 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
 234                                         struct komeda_dev *mdev)
 235 {
 236         struct drm_mode_config *config = &kms->base.mode_config;
 237
 238         drm_mode_config_init(&kms->base);
 239
 240         komeda_kms_setup_crtcs(kms, mdev);
 241
 242         /* Get value from dev */
 243         config->min_width       = 0;
 244         config->min_height      = 0;
 245         config->max_width       = 4096;
 246         config->max_height      = 4096;
 247         config->allow_fb_modifiers = true;
 248
 249         config->funcs = &komeda_mode_config_funcs;
 250         config->helper_private = &komeda_mode_config_helpers;
 251 }
 252
 253 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
 254 {
 255         struct komeda_kms_dev *kms;
 256         struct drm_device *drm;
 257         int err;
 258
 259         kms = devm_drm_dev_alloc(mdev->dev, &komeda_kms_driver,
 260                                  struct komeda_kms_dev, base);
 261         if (IS_ERR(kms))
 262                 return kms;
 263
 264         drm = &kms->base;
 265
 266         drm->dev_private = mdev;
 267
 268         komeda_kms_mode_config_init(kms, mdev);
 269
 270         err = komeda_kms_add_private_objs(kms, mdev);
 271         if (err)
 272                 goto cleanup_mode_config;
 273
 274         err = komeda_kms_add_planes(kms, mdev);
 275         if (err)
 276                 goto cleanup_mode_config;
 277
 278         err = drm_vblank_init(drm, kms->n_crtcs);
 279         if (err)
 280                 goto cleanup_mode_config;
 281
 282         err = komeda_kms_add_crtcs(kms, mdev);
 283         if (err)
 284                 goto cleanup_mode_config;
 285
 286         err = komeda_kms_add_wb_connectors(kms, mdev);
 287         if (err)
 288                 goto cleanup_mode_config;
 289
 290         err = component_bind_all(mdev->dev, kms);
 291         if (err)
 292                 goto cleanup_mode_config;
 293
 294         drm_mode_config_reset(drm);
 295
 296         err = devm_request_irq(drm->dev, mdev->irq,
 297                                komeda_kms_irq_handler, IRQF_SHARED,
 298                                drm->driver->name, drm);
 299         if (err)
 300                 goto free_component_binding;
 301
 302         drm->irq_enabled = true;
 303
 304         drm_kms_helper_poll_init(drm);
 305
 306         err = drm_dev_register(drm, 0);
 307         if (err)
 308                 goto free_interrupts;
 309
 310         return kms;
 311
 312 free_interrupts:
 313         drm_kms_helper_poll_fini(drm);
 314         drm->irq_enabled = false;
 315 free_component_binding:
 316         component_unbind_all(mdev->dev, drm);
 317 cleanup_mode_config:
 318         drm_mode_config_cleanup(drm);
 319         komeda_kms_cleanup_private_objs(kms);
 320         drm->dev_private = NULL;
 321         return ERR_PTR(err);
 322 }
 323
 324 void komeda_kms_detach(struct komeda_kms_dev *kms)
 325 {
 326         struct drm_device *drm = &kms->base;
 327         struct komeda_dev *mdev = drm->dev_private;
 328
 329         drm_dev_unregister(drm);
 330         drm_kms_helper_poll_fini(drm);
 331         drm_atomic_helper_shutdown(drm);
 332         drm->irq_enabled = false;
 333         component_unbind_all(mdev->dev, drm);
 334         drm_mode_config_cleanup(drm);
 335         komeda_kms_cleanup_private_objs(kms);
 336         drm->dev_private = NULL;
 337 }