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When EC sees discharge current hit BAT_MAX_DISCHG_CURRENT, we kick off a timer and ask AP to throttle. Then EC keeps monitoring discharge current. If the current doesn't drop below BAT_MAX_DISCHG_CURRENT - BAT_OCP_HYSTERESIS, we restart the timer and notify AP again, which shouldn't happen unless AP misses or ignores the first notification. When the timer expires, which means EC hasn't seen over-current for BAT_OCP_TIMEOUT_US, we ask AP to stop throttling. BUG=b:74321682, chromium:838754 BRANCH=scarlet TEST=manually test on scarlet, confirm EC sends EC_HOST_EVENT_THROTTLE_START and EC_HOST_EVENT_THROTTLE_STOP host events when entering/exiting OCP. Change-Id: I1e55fc23249596d8afec52a3885655ca9c1f2151 Signed-off-by: Philip Chen <philipchen@google.com> Reviewed-on: https://chromium-review.googlesource.com/994188 Commit-Ready: Philip Chen <philipchen@chromium.org> Tested-by: Philip Chen <philipchen@chromium.org> Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* Copyright (c) 2012 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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/* Common interface to throttle the AP */
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#ifndef __CROS_EC_THROTTLE_AP_H
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#define __CROS_EC_THROTTLE_AP_H
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/**
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* Level of throttling desired.
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*/
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enum throttle_level {
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THROTTLE_OFF = 0,
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THROTTLE_ON,
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};
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/**
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* Types of throttling desired. These are independent.
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*/
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enum throttle_type {
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THROTTLE_SOFT = 0, /* for example, host events */
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THROTTLE_HARD, /* for example, PROCHOT */
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NUM_THROTTLE_TYPES
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};
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/**
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* Possible sources for CPU throttling requests.
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*/
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enum throttle_sources {
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THROTTLE_SRC_THERMAL = 0,
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THROTTLE_SRC_BAT_DISCHG_CURRENT,
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};
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/**
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* Enable/disable CPU throttling.
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*
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* This is a virtual "OR" operation. Any caller can enable CPU throttling of
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* any type, but all callers must agree in order to disable that type.
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*
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* @param level Level of throttling desired
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* @param type Type of throttling desired
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* @param source Which task is requesting throttling
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*/
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#if defined(CONFIG_THROTTLE_AP) || \
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defined(CONFIG_THROTTLE_AP_ON_BAT_DISCHG_CURRENT)
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void throttle_ap(enum throttle_level level,
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enum throttle_type type,
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enum throttle_sources source);
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#else
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static inline void throttle_ap(enum throttle_level level,
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enum throttle_type type,
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enum throttle_sources source)
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{}
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#endif
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#endif /* __CROS_EC_THROTTLE_AP_H */
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