1c8b75bcaSEric Anholt /* 2c8b75bcaSEric Anholt * Copyright (C) 2015 Broadcom 3c8b75bcaSEric Anholt * 4c8b75bcaSEric Anholt * This program is free software; you can redistribute it and/or modify 5c8b75bcaSEric Anholt * it under the terms of the GNU General Public License version 2 as 6c8b75bcaSEric Anholt * published by the Free Software Foundation. 7c8b75bcaSEric Anholt */ 8c8b75bcaSEric Anholt 9c8b75bcaSEric Anholt /** 10c8b75bcaSEric Anholt * DOC: VC4 KMS 11c8b75bcaSEric Anholt * 12c8b75bcaSEric Anholt * This is the general code for implementing KMS mode setting that 13c8b75bcaSEric Anholt * doesn't clearly associate with any of the other objects (plane, 14c8b75bcaSEric Anholt * crtc, HDMI encoder). 15c8b75bcaSEric Anholt */ 16c8b75bcaSEric Anholt 17c8b75bcaSEric Anholt #include "drm_crtc.h" 18b501baccSEric Anholt #include "drm_atomic.h" 19c8b75bcaSEric Anholt #include "drm_atomic_helper.h" 20c8b75bcaSEric Anholt #include "drm_crtc_helper.h" 21c8b75bcaSEric Anholt #include "drm_plane_helper.h" 22c8b75bcaSEric Anholt #include "drm_fb_cma_helper.h" 23c8b75bcaSEric Anholt #include "vc4_drv.h" 24c8b75bcaSEric Anholt 2548666d56SDerek Foreman static void vc4_output_poll_changed(struct drm_device *dev) 2648666d56SDerek Foreman { 2748666d56SDerek Foreman struct vc4_dev *vc4 = to_vc4_dev(dev); 2848666d56SDerek Foreman 2948666d56SDerek Foreman if (vc4->fbdev) 3048666d56SDerek Foreman drm_fbdev_cma_hotplug_event(vc4->fbdev); 3148666d56SDerek Foreman } 3248666d56SDerek Foreman 33b501baccSEric Anholt struct vc4_commit { 34b501baccSEric Anholt struct drm_device *dev; 35b501baccSEric Anholt struct drm_atomic_state *state; 36b501baccSEric Anholt struct vc4_seqno_cb cb; 37b501baccSEric Anholt }; 38b501baccSEric Anholt 39b501baccSEric Anholt static void 40b501baccSEric Anholt vc4_atomic_complete_commit(struct vc4_commit *c) 41b501baccSEric Anholt { 42b501baccSEric Anholt struct drm_atomic_state *state = c->state; 43b501baccSEric Anholt struct drm_device *dev = state->dev; 44b501baccSEric Anholt struct vc4_dev *vc4 = to_vc4_dev(dev); 45b501baccSEric Anholt 46b501baccSEric Anholt drm_atomic_helper_commit_modeset_disables(dev, state); 47b501baccSEric Anholt 48b501baccSEric Anholt drm_atomic_helper_commit_planes(dev, state, false); 49b501baccSEric Anholt 50b501baccSEric Anholt drm_atomic_helper_commit_modeset_enables(dev, state); 51b501baccSEric Anholt 526674a904SEric Anholt /* Make sure that drm_atomic_helper_wait_for_vblanks() 536674a904SEric Anholt * actually waits for vblank. If we're doing a full atomic 546674a904SEric Anholt * modeset (as opposed to a vc4_update_plane() short circuit), 556674a904SEric Anholt * then we need to wait for scanout to be done with our 566674a904SEric Anholt * display lists before we free it and potentially reallocate 576674a904SEric Anholt * and overwrite the dlist memory with a new modeset. 586674a904SEric Anholt */ 596674a904SEric Anholt state->legacy_cursor_update = false; 606674a904SEric Anholt 61b501baccSEric Anholt drm_atomic_helper_wait_for_vblanks(dev, state); 62b501baccSEric Anholt 63b501baccSEric Anholt drm_atomic_helper_cleanup_planes(dev, state); 64b501baccSEric Anholt 65b501baccSEric Anholt drm_atomic_state_free(state); 66b501baccSEric Anholt 67b501baccSEric Anholt up(&vc4->async_modeset); 68b501baccSEric Anholt 69b501baccSEric Anholt kfree(c); 70b501baccSEric Anholt } 71b501baccSEric Anholt 72b501baccSEric Anholt static void 73b501baccSEric Anholt vc4_atomic_complete_commit_seqno_cb(struct vc4_seqno_cb *cb) 74b501baccSEric Anholt { 75b501baccSEric Anholt struct vc4_commit *c = container_of(cb, struct vc4_commit, cb); 76b501baccSEric Anholt 77b501baccSEric Anholt vc4_atomic_complete_commit(c); 78b501baccSEric Anholt } 79b501baccSEric Anholt 80b501baccSEric Anholt static struct vc4_commit *commit_init(struct drm_atomic_state *state) 81b501baccSEric Anholt { 82b501baccSEric Anholt struct vc4_commit *c = kzalloc(sizeof(*c), GFP_KERNEL); 83b501baccSEric Anholt 84b501baccSEric Anholt if (!c) 85b501baccSEric Anholt return NULL; 86b501baccSEric Anholt c->dev = state->dev; 87b501baccSEric Anholt c->state = state; 88b501baccSEric Anholt 89b501baccSEric Anholt return c; 90b501baccSEric Anholt } 91b501baccSEric Anholt 92b501baccSEric Anholt /** 93b501baccSEric Anholt * vc4_atomic_commit - commit validated state object 94b501baccSEric Anholt * @dev: DRM device 95b501baccSEric Anholt * @state: the driver state object 96b501baccSEric Anholt * @async: asynchronous commit 97b501baccSEric Anholt * 98b501baccSEric Anholt * This function commits a with drm_atomic_helper_check() pre-validated state 99b501baccSEric Anholt * object. This can still fail when e.g. the framebuffer reservation fails. For 100b501baccSEric Anholt * now this doesn't implement asynchronous commits. 101b501baccSEric Anholt * 102b501baccSEric Anholt * RETURNS 103b501baccSEric Anholt * Zero for success or -errno. 104b501baccSEric Anholt */ 105b501baccSEric Anholt static int vc4_atomic_commit(struct drm_device *dev, 106b501baccSEric Anholt struct drm_atomic_state *state, 107b501baccSEric Anholt bool async) 108b501baccSEric Anholt { 109b501baccSEric Anholt struct vc4_dev *vc4 = to_vc4_dev(dev); 110b501baccSEric Anholt int ret; 111b501baccSEric Anholt int i; 112b501baccSEric Anholt uint64_t wait_seqno = 0; 113b501baccSEric Anholt struct vc4_commit *c; 114b501baccSEric Anholt 115b501baccSEric Anholt c = commit_init(state); 116b501baccSEric Anholt if (!c) 117b501baccSEric Anholt return -ENOMEM; 118b501baccSEric Anholt 119b501baccSEric Anholt /* Make sure that any outstanding modesets have finished. */ 120b501baccSEric Anholt ret = down_interruptible(&vc4->async_modeset); 121b501baccSEric Anholt if (ret) { 122b501baccSEric Anholt kfree(c); 123b501baccSEric Anholt return ret; 124b501baccSEric Anholt } 125b501baccSEric Anholt 126b501baccSEric Anholt ret = drm_atomic_helper_prepare_planes(dev, state); 127b501baccSEric Anholt if (ret) { 128b501baccSEric Anholt kfree(c); 129b501baccSEric Anholt up(&vc4->async_modeset); 130b501baccSEric Anholt return ret; 131b501baccSEric Anholt } 132b501baccSEric Anholt 133b501baccSEric Anholt for (i = 0; i < dev->mode_config.num_total_plane; i++) { 134b501baccSEric Anholt struct drm_plane *plane = state->planes[i]; 135b501baccSEric Anholt struct drm_plane_state *new_state = state->plane_states[i]; 136b501baccSEric Anholt 137b501baccSEric Anholt if (!plane) 138b501baccSEric Anholt continue; 139b501baccSEric Anholt 140b501baccSEric Anholt if ((plane->state->fb != new_state->fb) && new_state->fb) { 141b501baccSEric Anholt struct drm_gem_cma_object *cma_bo = 142b501baccSEric Anholt drm_fb_cma_get_gem_obj(new_state->fb, 0); 143b501baccSEric Anholt struct vc4_bo *bo = to_vc4_bo(&cma_bo->base); 144b501baccSEric Anholt 145b501baccSEric Anholt wait_seqno = max(bo->seqno, wait_seqno); 146b501baccSEric Anholt } 147b501baccSEric Anholt } 148b501baccSEric Anholt 149b501baccSEric Anholt /* 150b501baccSEric Anholt * This is the point of no return - everything below never fails except 151b501baccSEric Anholt * when the hw goes bonghits. Which means we can commit the new state on 152b501baccSEric Anholt * the software side now. 153b501baccSEric Anholt */ 154b501baccSEric Anholt 155b501baccSEric Anholt drm_atomic_helper_swap_state(dev, state); 156b501baccSEric Anholt 157b501baccSEric Anholt /* 158b501baccSEric Anholt * Everything below can be run asynchronously without the need to grab 159b501baccSEric Anholt * any modeset locks at all under one condition: It must be guaranteed 160b501baccSEric Anholt * that the asynchronous work has either been cancelled (if the driver 161b501baccSEric Anholt * supports it, which at least requires that the framebuffers get 162b501baccSEric Anholt * cleaned up with drm_atomic_helper_cleanup_planes()) or completed 163b501baccSEric Anholt * before the new state gets committed on the software side with 164b501baccSEric Anholt * drm_atomic_helper_swap_state(). 165b501baccSEric Anholt * 166b501baccSEric Anholt * This scheme allows new atomic state updates to be prepared and 167b501baccSEric Anholt * checked in parallel to the asynchronous completion of the previous 168b501baccSEric Anholt * update. Which is important since compositors need to figure out the 169b501baccSEric Anholt * composition of the next frame right after having submitted the 170b501baccSEric Anholt * current layout. 171b501baccSEric Anholt */ 172b501baccSEric Anholt 173b501baccSEric Anholt if (async) { 174b501baccSEric Anholt vc4_queue_seqno_cb(dev, &c->cb, wait_seqno, 175b501baccSEric Anholt vc4_atomic_complete_commit_seqno_cb); 176b501baccSEric Anholt } else { 177b501baccSEric Anholt vc4_wait_for_seqno(dev, wait_seqno, ~0ull, false); 178b501baccSEric Anholt vc4_atomic_complete_commit(c); 179b501baccSEric Anholt } 180b501baccSEric Anholt 181b501baccSEric Anholt return 0; 182b501baccSEric Anholt } 183b501baccSEric Anholt 184c8b75bcaSEric Anholt static const struct drm_mode_config_funcs vc4_mode_funcs = { 18548666d56SDerek Foreman .output_poll_changed = vc4_output_poll_changed, 186c8b75bcaSEric Anholt .atomic_check = drm_atomic_helper_check, 187b501baccSEric Anholt .atomic_commit = vc4_atomic_commit, 188c8b75bcaSEric Anholt .fb_create = drm_fb_cma_create, 189c8b75bcaSEric Anholt }; 190c8b75bcaSEric Anholt 191c8b75bcaSEric Anholt int vc4_kms_load(struct drm_device *dev) 192c8b75bcaSEric Anholt { 19348666d56SDerek Foreman struct vc4_dev *vc4 = to_vc4_dev(dev); 194c8b75bcaSEric Anholt int ret; 195c8b75bcaSEric Anholt 196b501baccSEric Anholt sema_init(&vc4->async_modeset, 1); 197b501baccSEric Anholt 198c8b75bcaSEric Anholt ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 199c8b75bcaSEric Anholt if (ret < 0) { 200c8b75bcaSEric Anholt dev_err(dev->dev, "failed to initialize vblank\n"); 201c8b75bcaSEric Anholt return ret; 202c8b75bcaSEric Anholt } 203c8b75bcaSEric Anholt 204c8b75bcaSEric Anholt dev->mode_config.max_width = 2048; 205c8b75bcaSEric Anholt dev->mode_config.max_height = 2048; 206c8b75bcaSEric Anholt dev->mode_config.funcs = &vc4_mode_funcs; 207c8b75bcaSEric Anholt dev->mode_config.preferred_depth = 24; 208b501baccSEric Anholt dev->mode_config.async_page_flip = true; 209b501baccSEric Anholt 21098a44504SDerek Foreman dev->vblank_disable_allowed = true; 211c8b75bcaSEric Anholt 212c8b75bcaSEric Anholt drm_mode_config_reset(dev); 213c8b75bcaSEric Anholt 21448666d56SDerek Foreman vc4->fbdev = drm_fbdev_cma_init(dev, 32, 215c8b75bcaSEric Anholt dev->mode_config.num_crtc, 216c8b75bcaSEric Anholt dev->mode_config.num_connector); 21748666d56SDerek Foreman if (IS_ERR(vc4->fbdev)) 21848666d56SDerek Foreman vc4->fbdev = NULL; 219c8b75bcaSEric Anholt 220c8b75bcaSEric Anholt drm_kms_helper_poll_init(dev); 221c8b75bcaSEric Anholt 222c8b75bcaSEric Anholt return 0; 223c8b75bcaSEric Anholt } 224