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); 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, 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_plane *plane; 150 struct list_head zorder_list; 151 int order = 0, err; 152 153 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n", 154 crtc->base.id, crtc->name); 155 156 INIT_LIST_HEAD(&zorder_list); 157 158 /* This loop also added all effected planes into the new state */ 159 drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) { 160 plane_st = drm_atomic_get_plane_state(state, plane); 161 if (IS_ERR(plane_st)) 162 return PTR_ERR(plane_st); 163 164 /* Build a list by zpos increasing */ 165 err = komeda_plane_state_list_add(plane_st, &zorder_list); 166 if (err) 167 return err; 168 } 169 170 kcrtc_st->max_slave_zorder = 0; 171 172 list_for_each_entry(kplane_st, &zorder_list, zlist_node) { 173 plane_st = &kplane_st->base; 174 plane = plane_st->plane; 175 176 plane_st->normalized_zpos = order++; 177 /* When layer_split has been enabled, one plane will be handled 178 * by two separated komeda layers (left/right), which may needs 179 * two zorders. 180 * - zorder: for left_layer for left display part. 181 * - zorder + 1: will be reserved for right layer. 182 */ 183 if (to_kplane_st(plane_st)->layer_split) 184 order++; 185 186 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n", 187 plane->base.id, plane->name, 188 plane_st->zpos, plane_st->normalized_zpos); 189 190 /* calculate max slave zorder */ 191 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes)) 192 kcrtc_st->max_slave_zorder = 193 max(plane_st->normalized_zpos, 194 kcrtc_st->max_slave_zorder); 195 } 196 197 crtc_st->zpos_changed = true; 198 199 return 0; 200 } 201 202 static int komeda_kms_check(struct drm_device *dev, 203 struct drm_atomic_state *state) 204 { 205 struct drm_crtc *crtc; 206 struct drm_crtc_state *new_crtc_st; 207 int i, err; 208 209 err = drm_atomic_helper_check_modeset(dev, state); 210 if (err) 211 return err; 212 213 /* Komeda need to re-calculate resource assumption in every commit 214 * so need to add all affected_planes (even unchanged) to 215 * drm_atomic_state. 216 */ 217 for_each_new_crtc_in_state(state, crtc, new_crtc_st, i) { 218 err = drm_atomic_add_affected_planes(state, crtc); 219 if (err) 220 return err; 221 222 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st); 223 if (err) 224 return err; 225 } 226 227 err = drm_atomic_helper_check_planes(dev, state); 228 if (err) 229 return err; 230 231 return 0; 232 } 233 234 static const struct drm_mode_config_funcs komeda_mode_config_funcs = { 235 .fb_create = komeda_fb_create, 236 .atomic_check = komeda_kms_check, 237 .atomic_commit = drm_atomic_helper_commit, 238 }; 239 240 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms, 241 struct komeda_dev *mdev) 242 { 243 struct drm_mode_config *config = &kms->base.mode_config; 244 245 drm_mode_config_init(&kms->base); 246 247 komeda_kms_setup_crtcs(kms, mdev); 248 249 /* Get value from dev */ 250 config->min_width = 0; 251 config->min_height = 0; 252 config->max_width = 4096; 253 config->max_height = 4096; 254 config->allow_fb_modifiers = true; 255 256 config->funcs = &komeda_mode_config_funcs; 257 config->helper_private = &komeda_mode_config_helpers; 258 } 259 260 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev) 261 { 262 struct komeda_kms_dev *kms = kzalloc(sizeof(*kms), GFP_KERNEL); 263 struct drm_device *drm; 264 int err; 265 266 if (!kms) 267 return ERR_PTR(-ENOMEM); 268 269 drm = &kms->base; 270 err = drm_dev_init(drm, &komeda_kms_driver, mdev->dev); 271 if (err) 272 goto free_kms; 273 274 drm->dev_private = mdev; 275 276 komeda_kms_mode_config_init(kms, mdev); 277 278 err = komeda_kms_add_private_objs(kms, mdev); 279 if (err) 280 goto cleanup_mode_config; 281 282 err = komeda_kms_add_planes(kms, mdev); 283 if (err) 284 goto cleanup_mode_config; 285 286 err = drm_vblank_init(drm, kms->n_crtcs); 287 if (err) 288 goto cleanup_mode_config; 289 290 err = komeda_kms_add_crtcs(kms, mdev); 291 if (err) 292 goto cleanup_mode_config; 293 294 err = komeda_kms_add_wb_connectors(kms, mdev); 295 if (err) 296 goto cleanup_mode_config; 297 298 err = component_bind_all(mdev->dev, kms); 299 if (err) 300 goto cleanup_mode_config; 301 302 drm_mode_config_reset(drm); 303 304 err = devm_request_irq(drm->dev, mdev->irq, 305 komeda_kms_irq_handler, IRQF_SHARED, 306 drm->driver->name, drm); 307 if (err) 308 goto free_component_binding; 309 310 err = mdev->funcs->enable_irq(mdev); 311 if (err) 312 goto free_component_binding; 313 314 drm->irq_enabled = true; 315 316 drm_kms_helper_poll_init(drm); 317 318 err = drm_dev_register(drm, 0); 319 if (err) 320 goto free_interrupts; 321 322 return kms; 323 324 free_interrupts: 325 drm_kms_helper_poll_fini(drm); 326 drm->irq_enabled = false; 327 mdev->funcs->disable_irq(mdev); 328 free_component_binding: 329 component_unbind_all(mdev->dev, drm); 330 cleanup_mode_config: 331 drm_mode_config_cleanup(drm); 332 komeda_kms_cleanup_private_objs(kms); 333 drm->dev_private = NULL; 334 drm_dev_put(drm); 335 free_kms: 336 kfree(kms); 337 return ERR_PTR(err); 338 } 339 340 void komeda_kms_detach(struct komeda_kms_dev *kms) 341 { 342 struct drm_device *drm = &kms->base; 343 struct komeda_dev *mdev = drm->dev_private; 344 345 drm_dev_unregister(drm); 346 drm_kms_helper_poll_fini(drm); 347 drm_atomic_helper_shutdown(drm); 348 drm->irq_enabled = false; 349 mdev->funcs->disable_irq(mdev); 350 component_unbind_all(mdev->dev, drm); 351 drm_mode_config_cleanup(drm); 352 komeda_kms_cleanup_private_objs(kms); 353 drm->dev_private = NULL; 354 drm_dev_put(drm); 355 } 356