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auron: enable power limiting for thermal control

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Limit power to 12W at 90C and remove limit at 85C.

BUG=chrome-os-partner:33995
BRANCH=none
TEST=manual:

To have the CPU consume maximum power it is necessary to stress
both the CPU and the GPU.  Bastion (chrome.supergiantgames.com)
and/or webglsamples.googlecode.com can be useful for this.

Testing this properly requires a script to report the running
average power readings.  The watch_power.sh script is attached
to this issue in the partner tracker.

1) Run watch_power.sh continuously:
localhost ~ # watch -n 0 bash -e /tmp/watch_power_v2.sh
2) Start WebGL Aquarium (or other stress apps).  The power draw should
be close to 15W if under enough load.
3) Watch until temperature climbs above 90C and is caught by
the thermal zone 10 second poll, this can be sped up by blocking
or removing the fan.
4) The ACPI thermal zone states should change to reflect that
active[2] is now enabled and power consumption should drop to 12W.
5) Stop the stress apps and wait until the CPU cools off again,
enable the fan again if it was removed.
6) The ACPI thermal zone state should switch back to active[3].

Signed-off-by: Wei Shun Chang <wei.shun.chang@intel.com>
Change-Id: If6be36f7b8eed9347ed60b90e5a265f4f8d31548
Reviewed-on: https://chromium-review.googlesource.com/231382
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
This commit is contained in:
Wei Shun Chang 2014-11-22 03:20:41 +08:00 • committed by chrome-internal-fetch
commit 426d141d6e
3 changed files with 100 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

83
src/mainboard/google/auron/acpi/thermal.asl
View file

@ -17,6 +17,8 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <mainboard/google/auron/thermal.h>
// Thermal Zone
Scope (\_TZ)
@ -118,6 +120,87 @@ Scope (\_TZ)
Return (Local0)
}
/* CTDP Down */
Method (_AC0) {
If (LLessEqual (\FLVL, 0)) {
Return (CTOK (CTL_TDP_THRESHOLD_OFF))
} Else {
Return (CTOK (CTL_TDP_THRESHOLD_ON))
}
}
/* CTDP Nominal */
Method (_AC1) {
If (LLessEqual (\FLVL, 1)) {
Return (CTOK (CTL_TDP_THRESHILD_NORMAL))
} Else {
Return (CTOK (CTL_TDP_THRESHILD_NORMAL))
}
}
Name (_AL0, Package () { TDP0 })
Name (_AL1, Package () { TDP1 })
PowerResource (TNP0, 0, 0)
{
Method (_STA) {
If (LLessEqual (\FLVL, 0)) {
Return (One)
} Else {
Return (Zero)
}
}
Method (_ON) {
Store (0, \FLVL)
/* Enable Power Limit */
\_SB.PCI0.MCHC.CTLE (CTL_TDP_POWER_LIMIT)
Notify (\_TZ.THRM, 0x81)
}
Method (_OFF) {
Store (1, \FLVL)
/* Disable Power Limit */
\_SB.PCI0.MCHC.CTLD ()
Notify (\_TZ.THRM, 0x81)
}
}
PowerResource (TNP1, 0, 0)
{
Method (_STA) {
If (LLessEqual (\FLVL, 1)) {
Return (One)
} Else {
Return (Zero)
}
}
Method (_ON) {
Store (1, \FLVL)
Notify (\_TZ.THRM, 0x81)
}
Method (_OFF) {
Store (1, \FLVL)
Notify (\_TZ.THRM, 0x81)
}
}
Device (TDP0)
{
Name (_HID, EISAID ("PNP0C0B"))
Name (_UID, 0)
Name (_PR0, Package () { TNP0 })
}
Device (TDP1)
{
Name (_HID, EISAID ("PNP0C0B"))
Name (_UID, 1)
Name (_PR0, Package () { TNP1 })
}
}
}

15
src/mainboard/google/auron/acpi_tables.c
View file

@ -35,6 +35,16 @@
extern const unsigned char AmlCode[];
static void acpi_update_thermal_table(global_nvs_t *gnvs)
{
gnvs->tmps = CTL_TDP_SENSOR_ID;
gnvs->tcrt = CRITICAL_TEMPERATURE;
gnvs->tpsv = PASSIVE_TEMPERATURE;
gnvs->tmax = MAX_TEMPERATURE;
gnvs->flvl = 1;
}
static void acpi_create_gnvs(global_nvs_t *gnvs)
{
acpi_init_gnvs(gnvs);
@ -45,10 +55,7 @@ static void acpi_create_gnvs(global_nvs_t *gnvs)
/* Disable USB ports in S5 */
gnvs->s5u0 = 0;
gnvs->tmps = TEMPERATURE_SENSOR_ID;
gnvs->tcrt = CRITICAL_TEMPERATURE;
gnvs->tpsv = PASSIVE_TEMPERATURE;
gnvs->tmax = MAX_TEMPERATURE;
acpi_update_thermal_table(gnvs);
}
unsigned long acpi_fill_madt(unsigned long current)

7
src/mainboard/google/auron/thermal.h
View file

@ -20,7 +20,12 @@
#ifndef THERMAL_H
#define THERMAL_H
#define TEMPERATURE_SENSOR_ID 0 /* PECI */
/* Control TDP Settings */
#define CTL_TDP_SENSOR_ID 0 /* PECI */
#define CTL_TDP_POWER_LIMIT 12 /* 12W */
#define CTL_TDP_THRESHILD_NORMAL 0 /*Normal TDP Threshold*/
#define CTL_TDP_THRESHOLD_OFF 85 /* Normal at 85C */
#define CTL_TDP_THRESHOLD_ON 90 /* Limited at 90C */
/* Temperature which OS will shutdown at */
#define CRITICAL_TEMPERATURE 104