threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/*
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* Copyright (C) 2015 MediaTek Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <mt-plat/mtk_ccci_common.h>
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#include <linux/wait.h>
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static wait_queue_head_t time_update_notify_queue_head;
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static spinlock_t wait_count_lock;
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static unsigned int wait_count;
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static unsigned int get_update;
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static unsigned int api_ready;
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void ccci_timer_for_md_init(void)
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{
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init_waitqueue_head(&time_update_notify_queue_head);
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spin_lock_init(&wait_count_lock);
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wait_count = 0;
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get_update = 0;
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/* update in order */
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mb();
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api_ready = 1;
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}
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int wait_time_update_notify(void)
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{ /* Only support one wait currently */
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int ret = -1;
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unsigned long flags;
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if (api_ready) {
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/* Update wait count ++ */
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spin_lock_irqsave(&wait_count_lock, flags);
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wait_count++;
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spin_unlock_irqrestore(&wait_count_lock, flags);
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ret = wait_event_interruptible(
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time_update_notify_queue_head,
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get_update);
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if (ret != -ERESTARTSYS)
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get_update = 0;
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/* Update wait count -- */
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spin_lock_irqsave(&wait_count_lock, flags);
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wait_count--;
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spin_unlock_irqrestore(&wait_count_lock, flags);
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}
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return ret;
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}
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void notify_time_update(void)
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{
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unsigned long flags;
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if (!api_ready)
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return; /* API not ready */
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get_update = 1;
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spin_lock_irqsave(&wait_count_lock, flags);
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if (wait_count)
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wake_up_all(&time_update_notify_queue_head);
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spin_unlock_irqrestore(&wait_count_lock, flags);
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}
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