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, 86 DRM_PLANE_COMMIT_ACTIVE_ONLY); 87 88 drm_atomic_helper_commit_modeset_enables(dev, old_state); 89 90 drm_atomic_helper_wait_for_flip_done(dev, old_state); 91 92 drm_atomic_helper_commit_hw_done(old_state); 93 94 drm_atomic_helper_cleanup_planes(dev, old_state); 95 } 96 97 static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = { 98 .atomic_commit_tail = komeda_kms_commit_tail, 99 }; 100 101 static int komeda_plane_state_list_add(struct drm_plane_state *plane_st, 102 struct list_head *zorder_list) 103 { 104 struct komeda_plane_state *new = to_kplane_st(plane_st); 105 struct komeda_plane_state *node, *last; 106 107 last = list_empty(zorder_list) ? 108 NULL : list_last_entry(zorder_list, typeof(*last), zlist_node); 109 110 /* Considering the list sequence is zpos increasing, so if list is empty 111 * or the zpos of new node bigger than the last node in list, no need 112 * loop and just insert the new one to the tail of the list. 113 */ 114 if (!last || (new->base.zpos > last->base.zpos)) { 115 list_add_tail(&new->zlist_node, zorder_list); 116 return 0; 117 } 118 119 /* Build the list by zpos increasing */ 120 list_for_each_entry(node, zorder_list, zlist_node) { 121 if (new->base.zpos < node->base.zpos) { 122 list_add_tail(&new->zlist_node, &node->zlist_node); 123 break; 124 } else if (node->base.zpos == new->base.zpos) { 125 struct drm_plane *a = node->base.plane; 126 struct drm_plane *b = new->base.plane; 127 128 /* Komeda doesn't support setting a same zpos for 129 * different planes. 130 */ 131 DRM_DEBUG_ATOMIC("PLANE: %s and PLANE: %s are configured same zpos: %d.\n", 132 a->name, b->name, node->base.zpos); 133 return -EINVAL; 134 } 135 } 136 137 return 0; 138 } 139 140 static int komeda_crtc_normalize_zpos(struct drm_crtc *crtc, 141 struct drm_crtc_state *crtc_st) 142 { 143 struct drm_atomic_state *state = crtc_st->state; 144 struct komeda_crtc *kcrtc = to_kcrtc(crtc); 145 struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st); 146 struct komeda_plane_state *kplane_st; 147 struct drm_plane_state *plane_st; 148 struct drm_plane *plane; 149 struct list_head zorder_list; 150 int order = 0, err; 151 152 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n", 153 crtc->base.id, crtc->name); 154 155 INIT_LIST_HEAD(&zorder_list); 156 157 /* This loop also added all effected planes into the new state */ 158 drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) { 159 plane_st = drm_atomic_get_plane_state(state, plane); 160 if (IS_ERR(plane_st)) 161 return PTR_ERR(plane_st); 162 163 /* Build a list by zpos increasing */ 164 err = komeda_plane_state_list_add(plane_st, &zorder_list); 165 if (err) 166 return err; 167 } 168 169 kcrtc_st->max_slave_zorder = 0; 170 171 list_for_each_entry(kplane_st, &zorder_list, zlist_node) { 172 plane_st = &kplane_st->base; 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 *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_new_crtc_in_state(state, crtc, 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 free_component_binding; 308 309 err = mdev->funcs->enable_irq(mdev); 310 if (err) 311 goto free_component_binding; 312 313 drm->irq_enabled = true; 314 315 drm_kms_helper_poll_init(drm); 316 317 err = drm_dev_register(drm, 0); 318 if (err) 319 goto free_interrupts; 320 321 return kms; 322 323 free_interrupts: 324 drm_kms_helper_poll_fini(drm); 325 drm->irq_enabled = false; 326 mdev->funcs->disable_irq(mdev); 327 free_component_binding: 328 component_unbind_all(mdev->dev, drm); 329 cleanup_mode_config: 330 drm_mode_config_cleanup(drm); 331 komeda_kms_cleanup_private_objs(kms); 332 drm->dev_private = NULL; 333 drm_dev_put(drm); 334 free_kms: 335 kfree(kms); 336 return ERR_PTR(err); 337 } 338 339 void komeda_kms_detach(struct komeda_kms_dev *kms) 340 { 341 struct drm_device *drm = &kms->base; 342 struct komeda_dev *mdev = drm->dev_private; 343 344 drm_dev_unregister(drm); 345 drm_kms_helper_poll_fini(drm); 346 drm_atomic_helper_shutdown(drm); 347 drm->irq_enabled = false; 348 mdev->funcs->disable_irq(mdev); 349 component_unbind_all(mdev->dev, drm); 350 drm_mode_config_cleanup(drm); 351 komeda_kms_cleanup_private_objs(kms); 352 drm->dev_private = NULL; 353 drm_dev_put(drm); 354 } 355