1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7
8#include "msm_drv.h"
9#include "mdp_kms.h"
10
11
12struct mdp_irq_wait {
13	struct mdp_irq irq;
14	int count;
15};
16
17static DECLARE_WAIT_QUEUE_HEAD(wait_event);
18
19static DEFINE_SPINLOCK(list_lock);
20
21static void update_irq(struct mdp_kms *mdp_kms)
22{
23	struct mdp_irq *irq;
24	uint32_t irqmask = mdp_kms->vblank_mask;
25
26	assert_spin_locked(&list_lock);
27
28	list_for_each_entry(irq, &mdp_kms->irq_list, node)
29		irqmask |= irq->irqmask;
30
31	mdp_kms->funcs->set_irqmask(mdp_kms, irqmask, mdp_kms->cur_irq_mask);
32	mdp_kms->cur_irq_mask = irqmask;
33}
34
35/* if an mdp_irq's irqmask has changed, such as when mdp5 crtc<->encoder
36 * link changes, this must be called to figure out the new global irqmask
37 */
38void mdp_irq_update(struct mdp_kms *mdp_kms)
39{
40	unsigned long flags;
41	spin_lock_irqsave(&list_lock, flags);
42	update_irq(mdp_kms);
43	spin_unlock_irqrestore(&list_lock, flags);
44}
45
46void mdp_dispatch_irqs(struct mdp_kms *mdp_kms, uint32_t status)
47{
48	struct mdp_irq *handler, *n;
49	unsigned long flags;
50
51	spin_lock_irqsave(&list_lock, flags);
52	mdp_kms->in_irq = true;
53	list_for_each_entry_safe(handler, n, &mdp_kms->irq_list, node) {
54		if (handler->irqmask & status) {
55			spin_unlock_irqrestore(&list_lock, flags);
56			handler->irq(handler, handler->irqmask & status);
57			spin_lock_irqsave(&list_lock, flags);
58		}
59	}
60	mdp_kms->in_irq = false;
61	update_irq(mdp_kms);
62	spin_unlock_irqrestore(&list_lock, flags);
63
64}
65
66void mdp_update_vblank_mask(struct mdp_kms *mdp_kms, uint32_t mask, bool enable)
67{
68	unsigned long flags;
69
70	spin_lock_irqsave(&list_lock, flags);
71	if (enable)
72		mdp_kms->vblank_mask |= mask;
73	else
74		mdp_kms->vblank_mask &= ~mask;
75	update_irq(mdp_kms);
76	spin_unlock_irqrestore(&list_lock, flags);
77}
78
79static void wait_irq(struct mdp_irq *irq, uint32_t irqstatus)
80{
81	struct mdp_irq_wait *wait =
82			container_of(irq, struct mdp_irq_wait, irq);
83	wait->count--;
84	wake_up_all(&wait_event);
85}
86
87void mdp_irq_wait(struct mdp_kms *mdp_kms, uint32_t irqmask)
88{
89	struct mdp_irq_wait wait = {
90		.irq = {
91			.irq = wait_irq,
92			.irqmask = irqmask,
93		},
94		.count = 1,
95	};
96	mdp_irq_register(mdp_kms, &wait.irq);
97	wait_event_timeout(wait_event, (wait.count <= 0),
98			msecs_to_jiffies(100));
99	mdp_irq_unregister(mdp_kms, &wait.irq);
100}
101
102void mdp_irq_register(struct mdp_kms *mdp_kms, struct mdp_irq *irq)
103{
104	unsigned long flags;
105	bool needs_update = false;
106
107	spin_lock_irqsave(&list_lock, flags);
108
109	if (!irq->registered) {
110		irq->registered = true;
111		list_add(&irq->node, &mdp_kms->irq_list);
112		needs_update = !mdp_kms->in_irq;
113	}
114
115	spin_unlock_irqrestore(&list_lock, flags);
116
117	if (needs_update)
118		mdp_irq_update(mdp_kms);
119}
120
121void mdp_irq_unregister(struct mdp_kms *mdp_kms, struct mdp_irq *irq)
122{
123	unsigned long flags;
124	bool needs_update = false;
125
126	spin_lock_irqsave(&list_lock, flags);
127
128	if (irq->registered) {
129		irq->registered = false;
130		list_del(&irq->node);
131		needs_update = !mdp_kms->in_irq;
132	}
133
134	spin_unlock_irqrestore(&list_lock, flags);
135
136	if (needs_update)
137		mdp_irq_update(mdp_kms);
138}
139