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 } 338