1 // SPDX-License-Identifier: GPL-2.0
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
10 #include <drm/drm_atomic_helper.h>
11 #include <drm/drm_crtc_helper.h>
13 static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
15 struct vkms_output *output = container_of(timer, struct vkms_output,
17 struct drm_crtc *crtc = &output->crtc;
21 ret = drm_crtc_handle_vblank(crtc);
23 DRM_ERROR("vkms failure on handling vblank");
25 ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
28 return HRTIMER_RESTART;
31 static int vkms_enable_vblank(struct drm_crtc *crtc)
33 struct drm_device *dev = crtc->dev;
34 unsigned int pipe = drm_crtc_index(crtc);
35 struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
36 struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
38 drm_calc_timestamping_constants(crtc, &crtc->mode);
40 hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
41 out->vblank_hrtimer.function = &vkms_vblank_simulate;
42 out->period_ns = ktime_set(0, vblank->framedur_ns);
43 hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL);
48 static void vkms_disable_vblank(struct drm_crtc *crtc)
50 struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
52 hrtimer_cancel(&out->vblank_hrtimer);
55 bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
56 int *max_error, ktime_t *vblank_time,
59 struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
60 struct vkms_output *output = &vkmsdev->output;
62 *vblank_time = output->vblank_hrtimer.node.expires;
67 static const struct drm_crtc_funcs vkms_crtc_funcs = {
68 .set_config = drm_atomic_helper_set_config,
69 .destroy = drm_crtc_cleanup,
70 .page_flip = drm_atomic_helper_page_flip,
71 .reset = drm_atomic_helper_crtc_reset,
72 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
73 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
74 .enable_vblank = vkms_enable_vblank,
75 .disable_vblank = vkms_disable_vblank,
78 static void vkms_crtc_atomic_enable(struct drm_crtc *crtc,
79 struct drm_crtc_state *old_state)
81 drm_crtc_vblank_on(crtc);
84 static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
85 struct drm_crtc_state *old_state)
87 drm_crtc_vblank_off(crtc);
90 static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
91 struct drm_crtc_state *old_crtc_state)
95 if (crtc->state->event) {
96 spin_lock_irqsave(&crtc->dev->event_lock, flags);
98 if (drm_crtc_vblank_get(crtc) != 0)
99 drm_crtc_send_vblank_event(crtc, crtc->state->event);
101 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
103 spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
105 crtc->state->event = NULL;
109 static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
110 .atomic_flush = vkms_crtc_atomic_flush,
111 .atomic_enable = vkms_crtc_atomic_enable,
112 .atomic_disable = vkms_crtc_atomic_disable,
115 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
116 struct drm_plane *primary, struct drm_plane *cursor)
120 ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
121 &vkms_crtc_funcs, NULL);
123 DRM_ERROR("Failed to init CRTC\n");
127 drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);