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 struct drm_driver komeda_kms_driver = { 62 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 63 .lastclose = drm_fb_helper_lastclose, 64 .gem_free_object_unlocked = drm_gem_cma_free_object, 65 .gem_vm_ops = &drm_gem_cma_vm_ops, 66 .dumb_create = komeda_gem_cma_dumb_create, 67 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 68 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 69 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 70 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 71 .gem_prime_vmap = drm_gem_cma_prime_vmap, 72 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 73 .gem_prime_mmap = drm_gem_cma_prime_mmap, 74 .fops = &komeda_cma_fops, 75 .name = "komeda", 76 .desc = "Arm Komeda Display Processor driver", 77 .date = "20181101", 78 .major = 0, 79 .minor = 1, 80 }; 81 82 static void komeda_kms_commit_tail(struct drm_atomic_state *old_state) 83 { 84 struct drm_device *dev = old_state->dev; 85 86 drm_atomic_helper_commit_modeset_disables(dev, old_state); 87 88 drm_atomic_helper_commit_planes(dev, old_state, 89 DRM_PLANE_COMMIT_ACTIVE_ONLY); 90 91 drm_atomic_helper_commit_modeset_enables(dev, old_state); 92 93 drm_atomic_helper_wait_for_flip_done(dev, old_state); 94 95 drm_atomic_helper_commit_hw_done(old_state); 96 97 drm_atomic_helper_cleanup_planes(dev, old_state); 98 } 99 100 static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = { 101 .atomic_commit_tail = komeda_kms_commit_tail, 102 }; 103 104 static int komeda_plane_state_list_add(struct drm_plane_state *plane_st, 105 struct list_head *zorder_list) 106 { 107 struct komeda_plane_state *new = to_kplane_st(plane_st); 108 struct komeda_plane_state *node, *last; 109 110 last = list_empty(zorder_list) ? 111 NULL : list_last_entry(zorder_list, typeof(*last), zlist_node); 112 113 /* Considering the list sequence is zpos increasing, so if list is empty 114 * or the zpos of new node bigger than the last node in list, no need 115 * loop and just insert the new one to the tail of the list. 116 */ 117 if (!last || (new->base.zpos > last->base.zpos)) { 118 list_add_tail(&new->zlist_node, zorder_list); 119 return 0; 120 } 121 122 /* Build the list by zpos increasing */ 123 list_for_each_entry(node, zorder_list, zlist_node) { 124 if (new->base.zpos < node->base.zpos) { 125 list_add_tail(&new->zlist_node, &node->zlist_node); 126 break; 127 } else if (node->base.zpos == new->base.zpos) { 128 struct drm_plane *a = node->base.plane; 129 struct drm_plane *b = new->base.plane; 130 131 /* Komeda doesn't support setting a same zpos for 132 * different planes. 133 */ 134 DRM_DEBUG_ATOMIC("PLANE: %s and PLANE: %s are configured same zpos: %d.\n", 135 a->name, b->name, node->base.zpos); 136 return -EINVAL; 137 } 138 } 139 140 return 0; 141 } 142 143 static int komeda_crtc_normalize_zpos(struct drm_crtc *crtc, 144 struct drm_crtc_state *crtc_st) 145 { 146 struct drm_atomic_state *state = crtc_st->state; 147 struct komeda_crtc *kcrtc = to_kcrtc(crtc); 148 struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st); 149 struct komeda_plane_state *kplane_st; 150 struct drm_plane_state *plane_st; 151 struct drm_plane *plane; 152 struct list_head zorder_list; 153 int order = 0, err; 154 155 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n", 156 crtc->base.id, crtc->name); 157 158 INIT_LIST_HEAD(&zorder_list); 159 160 /* This loop also added all effected planes into the new state */ 161 drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) { 162 plane_st = drm_atomic_get_plane_state(state, plane); 163 if (IS_ERR(plane_st)) 164 return PTR_ERR(plane_st); 165 166 /* Build a list by zpos increasing */ 167 err = komeda_plane_state_list_add(plane_st, &zorder_list); 168 if (err) 169 return err; 170 } 171 172 kcrtc_st->max_slave_zorder = 0; 173 174 list_for_each_entry(kplane_st, &zorder_list, zlist_node) { 175 plane_st = &kplane_st->base; 176 plane = plane_st->plane; 177 178 plane_st->normalized_zpos = order++; 179 /* When layer_split has been enabled, one plane will be handled 180 * by two separated komeda layers (left/right), which may needs 181 * two zorders. 182 * - zorder: for left_layer for left display part. 183 * - zorder + 1: will be reserved for right layer. 184 */ 185 if (to_kplane_st(plane_st)->layer_split) 186 order++; 187 188 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n", 189 plane->base.id, plane->name, 190 plane_st->zpos, plane_st->normalized_zpos); 191 192 /* calculate max slave zorder */ 193 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes)) 194 kcrtc_st->max_slave_zorder = 195 max(plane_st->normalized_zpos, 196 kcrtc_st->max_slave_zorder); 197 } 198 199 crtc_st->zpos_changed = true; 200 201 return 0; 202 } 203 204 static int komeda_kms_check(struct drm_device *dev, 205 struct drm_atomic_state *state) 206 { 207 struct drm_crtc *crtc; 208 struct drm_crtc_state *new_crtc_st; 209 int i, err; 210 211 err = drm_atomic_helper_check_modeset(dev, state); 212 if (err) 213 return err; 214 215 /* Komeda need to re-calculate resource assumption in every commit 216 * so need to add all affected_planes (even unchanged) to 217 * drm_atomic_state. 218 */ 219 for_each_new_crtc_in_state(state, crtc, new_crtc_st, i) { 220 err = drm_atomic_add_affected_planes(state, crtc); 221 if (err) 222 return err; 223 224 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st); 225 if (err) 226 return err; 227 } 228 229 err = drm_atomic_helper_check_planes(dev, state); 230 if (err) 231 return err; 232 233 return 0; 234 } 235 236 static const struct drm_mode_config_funcs komeda_mode_config_funcs = { 237 .fb_create = komeda_fb_create, 238 .atomic_check = komeda_kms_check, 239 .atomic_commit = drm_atomic_helper_commit, 240 }; 241 242 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms, 243 struct komeda_dev *mdev) 244 { 245 struct drm_mode_config *config = &kms->base.mode_config; 246 247 drm_mode_config_init(&kms->base); 248 249 komeda_kms_setup_crtcs(kms, mdev); 250 251 /* Get value from dev */ 252 config->min_width = 0; 253 config->min_height = 0; 254 config->max_width = 4096; 255 config->max_height = 4096; 256 config->allow_fb_modifiers = true; 257 258 config->funcs = &komeda_mode_config_funcs; 259 config->helper_private = &komeda_mode_config_helpers; 260 } 261 262 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev) 263 { 264 struct komeda_kms_dev *kms; 265 struct drm_device *drm; 266 int err; 267 268 kms = devm_drm_dev_alloc(mdev->dev, &komeda_kms_driver, 269 struct komeda_kms_dev, base); 270 if (IS_ERR(kms)) 271 return kms; 272 273 drm = &kms->base; 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 return ERR_PTR(err); 331 } 332 333 void komeda_kms_detach(struct komeda_kms_dev *kms) 334 { 335 struct drm_device *drm = &kms->base; 336 struct komeda_dev *mdev = drm->dev_private; 337 338 drm_dev_unregister(drm); 339 drm_kms_helper_poll_fini(drm); 340 drm_atomic_helper_shutdown(drm); 341 drm->irq_enabled = false; 342 component_unbind_all(mdev->dev, drm); 343 drm_mode_config_cleanup(drm); 344 komeda_kms_cleanup_private_objs(kms); 345 drm->dev_private = NULL; 346 } 347