mirror of https://gitee.com/openkylin/linux.git
146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "msm_drv.h"
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#include "mdp_kms.h"
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struct mdp_irq_wait {
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struct mdp_irq irq;
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int count;
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};
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static DECLARE_WAIT_QUEUE_HEAD(wait_event);
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static DEFINE_SPINLOCK(list_lock);
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static void update_irq(struct mdp_kms *mdp_kms)
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{
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struct mdp_irq *irq;
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uint32_t irqmask = mdp_kms->vblank_mask;
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BUG_ON(!spin_is_locked(&list_lock));
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list_for_each_entry(irq, &mdp_kms->irq_list, node)
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irqmask |= irq->irqmask;
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mdp_kms->funcs->set_irqmask(mdp_kms, irqmask);
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}
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static void update_irq_unlocked(struct mdp_kms *mdp_kms)
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{
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unsigned long flags;
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spin_lock_irqsave(&list_lock, flags);
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update_irq(mdp_kms);
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spin_unlock_irqrestore(&list_lock, flags);
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}
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void mdp_dispatch_irqs(struct mdp_kms *mdp_kms, uint32_t status)
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{
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struct mdp_irq *handler, *n;
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unsigned long flags;
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spin_lock_irqsave(&list_lock, flags);
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mdp_kms->in_irq = true;
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list_for_each_entry_safe(handler, n, &mdp_kms->irq_list, node) {
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if (handler->irqmask & status) {
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spin_unlock_irqrestore(&list_lock, flags);
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handler->irq(handler, handler->irqmask & status);
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spin_lock_irqsave(&list_lock, flags);
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}
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}
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mdp_kms->in_irq = false;
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update_irq(mdp_kms);
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spin_unlock_irqrestore(&list_lock, flags);
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}
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void mdp_update_vblank_mask(struct mdp_kms *mdp_kms, uint32_t mask, bool enable)
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{
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unsigned long flags;
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spin_lock_irqsave(&list_lock, flags);
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if (enable)
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mdp_kms->vblank_mask |= mask;
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else
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mdp_kms->vblank_mask &= ~mask;
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update_irq(mdp_kms);
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spin_unlock_irqrestore(&list_lock, flags);
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}
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static void wait_irq(struct mdp_irq *irq, uint32_t irqstatus)
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{
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struct mdp_irq_wait *wait =
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container_of(irq, struct mdp_irq_wait, irq);
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wait->count--;
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wake_up_all(&wait_event);
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}
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void mdp_irq_wait(struct mdp_kms *mdp_kms, uint32_t irqmask)
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{
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struct mdp_irq_wait wait = {
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.irq = {
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.irq = wait_irq,
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.irqmask = irqmask,
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},
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.count = 1,
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};
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mdp_irq_register(mdp_kms, &wait.irq);
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wait_event_timeout(wait_event, (wait.count <= 0),
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msecs_to_jiffies(100));
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mdp_irq_unregister(mdp_kms, &wait.irq);
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}
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void mdp_irq_register(struct mdp_kms *mdp_kms, struct mdp_irq *irq)
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{
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unsigned long flags;
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bool needs_update = false;
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spin_lock_irqsave(&list_lock, flags);
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if (!irq->registered) {
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irq->registered = true;
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list_add(&irq->node, &mdp_kms->irq_list);
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needs_update = !mdp_kms->in_irq;
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}
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spin_unlock_irqrestore(&list_lock, flags);
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if (needs_update)
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update_irq_unlocked(mdp_kms);
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}
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void mdp_irq_unregister(struct mdp_kms *mdp_kms, struct mdp_irq *irq)
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{
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unsigned long flags;
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bool needs_update = false;
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spin_lock_irqsave(&list_lock, flags);
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if (irq->registered) {
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irq->registered = false;
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list_del(&irq->node);
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needs_update = !mdp_kms->in_irq;
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}
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spin_unlock_irqrestore(&list_lock, flags);
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if (needs_update)
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update_irq_unlocked(mdp_kms);
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}
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