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google/gru: change kevin boot-time center logic voltage to 925mV 

Kevin's center logic isn't super clean so it needs 925 mV for center
logic.  All newer gru variants only need 900 mV.

BRANCH=gru
BUG=b:37429075
TEST=Reboot tests

Change-Id: I8c3bd6c245700b23c27cd5758c35c9993f801cb4
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/479463
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/19357
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Douglas Anderson 2017-04-17 13:18:11 -07:00 committed by Julius Werner
parent 38bee539b1
commit 992c7dba7e
1 changed files with 7 additions and 1 deletions
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8
src/mainboard/google/gru/romstage.c
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@ -38,7 +38,13 @@ static void init_dvs_outputs(void)
{
pwm_regulator_configure(PWM_REGULATOR_GPU, 900);
pwm_regulator_configure(PWM_REGULATOR_BIG, 900);
pwm_regulator_configure(PWM_REGULATOR_CENTERLOG, 900);
/* Kevin's logic rail has some ripple, so up the voltage a bit */
if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN))
pwm_regulator_configure(PWM_REGULATOR_CENTERLOG, 925);
else
pwm_regulator_configure(PWM_REGULATOR_CENTERLOG, 900);
/* Allow time for the regulators to settle */
udelay(500);
}