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superio/ite: configure EC for fans to full at thermal limit 

This applies to the automatic fan control mode of the environment
controller (EC). Previously the affected bit was always cleared while
the default value is 1 according to datasheets. Add a variable that can
be set per mainboard in devicetree.cb.

In the IT8783E datasheet that bit is marked as reserved.

Signed-off-by: Michael Büchler <michael.buechler@posteo.net>
Change-Id: Ie74102ac0d54be33558c161c9c84594d121772b1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44165
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
This commit is contained in:
Michael Büchler 2020-06-01 23:22:10 +02:00 committed by Felix Held
parent a2bb4553a5
commit e693b1d549
3 changed files with 16 additions and 10 deletions
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6
src/superio/ite/common/env_ctrl.c
View File

@ -113,6 +113,7 @@ static void fan_smartconfig(const u16 base, const u8 fan,
u8 pwm_ctrl;
u8 pwm_start = 0;
u8 pwm_auto = 0;
u8 delta_temp;
if (mode == FAN_SMART_SOFTWARE) {
pwm_ctrl = ITE_EC_FAN_CTL_PWM_MODE_SOFTWARE;
@ -145,8 +146,11 @@ static void fan_smartconfig(const u16 base, const u8 fan,
/* Full speed above 127°C by default */
pnp_write_hwm5_index(base, ITE_EC_FAN_CTL_TEMP_LIMIT_FULL(fan),
conf->tmp_full ? conf->tmp_full : 127);
delta_temp = ITE_EC_FAN_CTL_DELTA_TEMP_INTRVL(conf->tmp_delta);
delta_temp |= ITE_EC_FAN_CTL_FULL_AT_THRML_LMT(conf->full_lmt);
pnp_write_hwm5_index(base, ITE_EC_FAN_CTL_DELTA_TEMP(fan),
ITE_EC_FAN_CTL_DELTA_TEMP_INTRVL(conf->tmp_delta));
delta_temp);
}
pnp_write_hwm5_index(base, ITE_EC_FAN_CTL_PWM_CONTROL(fan), pwm_ctrl);

1
src/superio/ite/common/env_ctrl.h
View File

@ -185,6 +185,7 @@ static const u8 ITE_EC_TEMP_ADJUST[] = { 0x56, 0x57, 0x59 };
/* Common for ITE_EC_FAN_CTL_DELTA_TEMP */
#define ITE_EC_FAN_CTL_DELTA_TEMP_INTRVL(c) ((c) & 0x1f)
#define ITE_EC_FAN_CTL_FULL_AT_THRML_LMT(x) (((x) & 0x1) << 6)
#define ITE_EC_FAN_CTL_TARGET_ZONE(x) (0x66 + ((x)-1) * 8)
#define ITE_EC_FAN_CTL_TARGET_ZONE_MASK 0x0f

5
src/superio/ite/common/env_ctrl_chip.h
View File

@ -54,8 +54,9 @@ struct ite_ec_fan_smartconfig {
u8 tmp_off; /* turn fan off below (°C) */
u8 tmp_start; /* turn fan on above (°C) */
u8 tmp_full; /* 100% duty cycle above (°C) */
u8 tmp_delta; /* adapt fan speed when temperature
changed by at least `tmp_delta`°C */
u8 tmp_delta; /* adapt fan speed when temperature changed by
at least `tmp_delta`°C */
u8 full_lmt; /* force fan to full PWM at thermal limit */
u8 smoothing; /* enable smoothing */
u8 pwm_start; /* start at this duty cycle (%) */
u8 slope; /* increase duty cycle by `slope`%/°C */