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dptf: Add support for Passive Policies

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This patch adds support for emitting the Thermal Relationship Table, as
well as _PSV Methods, which together form the basis for DPTF Passive
Policies.

BUG=b:143539650
TEST=compiles

Change-Id: I82e1c9022999b0a2a733aa6cd9c98a850e6f5408
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41886
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Tim Wawrzynczak
2020-05-29 14:10:53 -06:00
committed by Patrick Georgi
parent c41f7f15c1
commit 7eb1136c27
4 changed files with 131 additions and 0 deletions
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23
src/include/acpi/acpigen_dptf.h
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@@ -27,6 +27,7 @@ enum {
/* A device can only define _AC0 .. _AC9 i.e. between 0 and 10 Active Cooling Methods */
DPTF_MAX_ACX = 10,
DPTF_MAX_ACTIVE_POLICIES = (DPTF_PARTICIPANT_COUNT-1),
DPTF_MAX_PASSIVE_POLICIES = (DPTF_PARTICIPANT_COUNT-1),
};
/* Active Policy */
@@ -44,6 +45,20 @@ struct dptf_active_policy {
} thresholds[DPTF_MAX_ACX];
};
/* Passive Policy */
struct dptf_passive_policy {
/* The device that can be throttled */
enum dptf_participant source;
/* The device that controls the throttling */
enum dptf_participant target;
/* How often to check the temperature for required throttling (ms) */
uint16_t period;
/* The trip point for turning on throttling (degrees C) */
uint8_t temp;
/* Relative priority between Policies */
uint8_t priority;
};
/*
* This function provides tables of temperature and corresponding fan or percent. When the
* temperature thresholds are met (_AC0 - _AC9), the fan is driven to corresponding percentage
@@ -51,6 +66,14 @@ struct dptf_active_policy {
*/
void dptf_write_active_policies(const struct dptf_active_policy *policies, int max_count);
/*
* This function uses the definition of the passive policies to write out _PSV Methods on all
* participants that define it. It also writes out the Thermal Relationship Table
* (\_SB.DPTF._TRT), which describes various passive (i.e., throttling) policies that can be
* applies when temperature sensors reach the _PSV threshold.
*/
void dptf_write_passive_policies(const struct dptf_passive_policy *policies, int max_count);
/* Helper method to open the scope for a given participant. */
void dptf_write_scope(enum dptf_participant participant);