2 * Copyright (C) 2015 Broadcom
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
12 * This is the general code for implementing KMS mode setting that
13 * doesn't clearly associate with any of the other objects (plane,
14 * crtc, HDMI encoder).
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_atomic.h>
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_crtc_helper.h>
21 #include <drm/drm_plane_helper.h>
22 #include <drm/drm_fb_cma_helper.h>
23 #include <drm/drm_gem_framebuffer_helper.h>
26 static void vc4_output_poll_changed(struct drm_device *dev)
28 struct vc4_dev *vc4 = to_vc4_dev(dev);
30 drm_fbdev_cma_hotplug_event(vc4->fbdev);
34 vc4_atomic_complete_commit(struct drm_atomic_state *state)
36 struct drm_device *dev = state->dev;
37 struct vc4_dev *vc4 = to_vc4_dev(dev);
39 drm_atomic_helper_wait_for_fences(dev, state, false);
41 drm_atomic_helper_wait_for_dependencies(state);
43 drm_atomic_helper_commit_modeset_disables(dev, state);
45 drm_atomic_helper_commit_planes(dev, state, 0);
47 drm_atomic_helper_commit_modeset_enables(dev, state);
49 /* Make sure that drm_atomic_helper_wait_for_vblanks()
50 * actually waits for vblank. If we're doing a full atomic
51 * modeset (as opposed to a vc4_update_plane() short circuit),
52 * then we need to wait for scanout to be done with our
53 * display lists before we free it and potentially reallocate
54 * and overwrite the dlist memory with a new modeset.
56 state->legacy_cursor_update = false;
58 drm_atomic_helper_commit_hw_done(state);
60 drm_atomic_helper_wait_for_vblanks(dev, state);
62 drm_atomic_helper_cleanup_planes(dev, state);
64 drm_atomic_helper_commit_cleanup_done(state);
66 drm_atomic_state_put(state);
68 up(&vc4->async_modeset);
71 static void commit_work(struct work_struct *work)
73 struct drm_atomic_state *state = container_of(work,
74 struct drm_atomic_state,
76 vc4_atomic_complete_commit(state);
80 * vc4_atomic_commit - commit validated state object
82 * @state: the driver state object
83 * @nonblock: nonblocking commit
85 * This function commits a with drm_atomic_helper_check() pre-validated state
86 * object. This can still fail when e.g. the framebuffer reservation fails. For
87 * now this doesn't implement asynchronous commits.
90 * Zero for success or -errno.
92 static int vc4_atomic_commit(struct drm_device *dev,
93 struct drm_atomic_state *state,
96 struct vc4_dev *vc4 = to_vc4_dev(dev);
99 ret = drm_atomic_helper_setup_commit(state, nonblock);
103 INIT_WORK(&state->commit_work, commit_work);
105 ret = down_interruptible(&vc4->async_modeset);
109 ret = drm_atomic_helper_prepare_planes(dev, state);
111 up(&vc4->async_modeset);
116 ret = drm_atomic_helper_wait_for_fences(dev, state, true);
118 drm_atomic_helper_cleanup_planes(dev, state);
119 up(&vc4->async_modeset);
125 * This is the point of no return - everything below never fails except
126 * when the hw goes bonghits. Which means we can commit the new state on
127 * the software side now.
130 BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
133 * Everything below can be run asynchronously without the need to grab
134 * any modeset locks at all under one condition: It must be guaranteed
135 * that the asynchronous work has either been cancelled (if the driver
136 * supports it, which at least requires that the framebuffers get
137 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
138 * before the new state gets committed on the software side with
139 * drm_atomic_helper_swap_state().
141 * This scheme allows new atomic state updates to be prepared and
142 * checked in parallel to the asynchronous completion of the previous
143 * update. Which is important since compositors need to figure out the
144 * composition of the next frame right after having submitted the
148 drm_atomic_state_get(state);
150 queue_work(system_unbound_wq, &state->commit_work);
152 vc4_atomic_complete_commit(state);
157 static struct drm_framebuffer *vc4_fb_create(struct drm_device *dev,
158 struct drm_file *file_priv,
159 const struct drm_mode_fb_cmd2 *mode_cmd)
161 struct drm_mode_fb_cmd2 mode_cmd_local;
163 /* If the user didn't specify a modifier, use the
164 * vc4_set_tiling_ioctl() state for the BO.
166 if (!(mode_cmd->flags & DRM_MODE_FB_MODIFIERS)) {
167 struct drm_gem_object *gem_obj;
170 gem_obj = drm_gem_object_lookup(file_priv,
171 mode_cmd->handles[0]);
173 DRM_DEBUG("Failed to look up GEM BO %d\n",
174 mode_cmd->handles[0]);
175 return ERR_PTR(-ENOENT);
177 bo = to_vc4_bo(gem_obj);
179 mode_cmd_local = *mode_cmd;
182 mode_cmd_local.modifier[0] =
183 DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED;
185 mode_cmd_local.modifier[0] = DRM_FORMAT_MOD_NONE;
188 drm_gem_object_put_unlocked(gem_obj);
190 mode_cmd = &mode_cmd_local;
193 return drm_gem_fb_create(dev, file_priv, mode_cmd);
196 static const struct drm_mode_config_funcs vc4_mode_funcs = {
197 .output_poll_changed = vc4_output_poll_changed,
198 .atomic_check = drm_atomic_helper_check,
199 .atomic_commit = vc4_atomic_commit,
200 .fb_create = vc4_fb_create,
203 int vc4_kms_load(struct drm_device *dev)
205 struct vc4_dev *vc4 = to_vc4_dev(dev);
208 sema_init(&vc4->async_modeset, 1);
210 /* Set support for vblank irq fast disable, before drm_vblank_init() */
211 dev->vblank_disable_immediate = true;
213 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
215 dev_err(dev->dev, "failed to initialize vblank\n");
219 dev->mode_config.max_width = 2048;
220 dev->mode_config.max_height = 2048;
221 dev->mode_config.funcs = &vc4_mode_funcs;
222 dev->mode_config.preferred_depth = 24;
223 dev->mode_config.async_page_flip = true;
225 drm_mode_config_reset(dev);
227 if (dev->mode_config.num_connector) {
228 vc4->fbdev = drm_fbdev_cma_init(dev, 32,
229 dev->mode_config.num_connector);
230 if (IS_ERR(vc4->fbdev))
234 drm_kms_helper_poll_init(dev);