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If our 32-bit usec timer is close to overflow, we may deep sleep several times in succession without making any adjustment to our count, causing deadlines on the other side (eg. HOOK_TICK expiration) to be reached much slower than expected. Avoid this by not entering deep sleep if our timer is about to overflow. This will result in a <= HOOK_TICK_INTERVAL (200ms interval) period of not entering deep sleep, every ~4300 seconds. BUG=chrome-os-partner:59240 BRANCH=gru TEST=Verify 3x kevin units survive 16 hours in S3 without EC watchdog. Change-Id: I2126458be8820f78212e19c2bb79242ff1194f6f Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/409673 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>
36 lines
997 B
C
36 lines
997 B
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* NPCX-specific hwtimer module for Chrome EC */
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#ifndef __CROS_EC_HWTIMER_CHIP_H
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#define __CROS_EC_HWTIMER_CHIP_H
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/* Channel definition for ITIM */
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#define ITIM_EVENT_NO ITIM16_1
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#define ITIM_WDG_NO ITIM16_5
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/* Use ITIM32 as main hardware timer */
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#define TICK_ITIM32_MAX_CNT 0xFFFFFFFF
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/* Maximum deadline of event */
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#define EVT_MAX_EXPIRED_US TICK_ITIM32_MAX_CNT
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/* Clock source for ITIM16 */
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enum ITIM_SOURCE_CLOCK_T {
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ITIM_SOURCE_CLOCK_APB2 = 0,
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ITIM_SOURCE_CLOCK_32K = 1,
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};
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/* Initialize ITIM16 timer */
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void init_hw_timer(int itim_no, enum ITIM_SOURCE_CLOCK_T source);
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/* Returns the counter value of event timer */
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uint16_t __hw_clock_event_count(void);
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/* Returns time delay because of deep idle */
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uint32_t __hw_clock_get_sleep_time(uint16_t pre_evt_cnt);
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#endif /* __CROS_EC_HWTIMER_CHIP_H */
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