From 38bee539b12c11c3bba453858b748fd741097f76 Mon Sep 17 00:00:00 2001
From: Derek Basehore <dbasehore@chromium.org>
Date: Wed, 21 Sep 2016 17:42:26 -0700
Subject: google/gru: change center logic voltage to 900mV

It seems that we should only ever run at 900mV on center logic.
Changing it to 950mV before might have just masked over problems that
are now fixed.

BRANCH=none
BUG=chrome-os-partner:56940
TEST=on kevin, run
stressapptest -M 1536 -s 1000

Change-Id: I5a09b1b403df800396bb2f2e8c76d14a4519d44a
Signed-off-by: Derek Basehore <dbasehore@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/391032
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Commit-Queue: Lin Huang <hl@rock-chips.com>
Tested-by: Lin Huang <hl@rock-chips.com>
Reviewed-on: https://review.coreboot.org/19356
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
---
 src/mainboard/google/gru/romstage.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/mainboard/google/gru/romstage.c b/src/mainboard/google/gru/romstage.c
index 7f84a2a2a1..4ea53181ae 100644
--- a/src/mainboard/google/gru/romstage.c
+++ b/src/mainboard/google/gru/romstage.c
@@ -21,6 +21,7 @@
 #include <cbfs.h>
 #include <cbmem.h>
 #include <console/console.h>
+#include <delay.h>
 #include <program_loading.h>
 #include <romstage_handoff.h>
 #include <soc/addressmap.h>
@@ -37,7 +38,9 @@ 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, 950);
+	pwm_regulator_configure(PWM_REGULATOR_CENTERLOG, 900);
+	/* Allow time for the regulators to settle */
+	udelay(500);
 }
 
 static void prepare_usb(void)
-- 
cgit v1.2.3