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authorJulius Werner <jwerner@chromium.org>2014-11-10 19:53:45 -0800
committerPatrick Georgi <pgeorgi@google.com>2015-04-10 20:50:29 +0200
commit63451c73bd8fc587247b2e75587b1137fdbebf38 (patch)
tree0608f1b055b9ed922ad6a2ba044895222bd88d9b /src/mainboard/google/veyron_jerry
parent539e856643f9a7396638c05db5c4dbfb136e292b (diff)
downloadcoreboot-63451c73bd8fc587247b2e75587b1137fdbebf38.tar.xz
veyron_jerry: Port CPU overshoot prevention
This patch ports commit 567f616f (rk3288: slowly raise to max cpu voltage to prevent overshoot) to Veyron_Jerry. It also fixes include ordering and some comment grammar in the affected code. BRANCH=None BUG=chrome-os-partner:32716 TEST=None Change-Id: I4ac14a38e4b3acc4926d4f51f409ff12d9c841cf Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 679014bc843788e8d4d5f5c7470ae76f8be5e942 Original-Change-Id: I9c0aba40ddd8a0852391df184034baa740d063df Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/228938 Original-Reviewed-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: http://review.coreboot.org/9550 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/mainboard/google/veyron_jerry')
-rw-r--r--src/mainboard/google/veyron_jerry/bootblock.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/src/mainboard/google/veyron_jerry/bootblock.c b/src/mainboard/google/veyron_jerry/bootblock.c
index b34199dfe5..30b00e1145 100644
--- a/src/mainboard/google/veyron_jerry/bootblock.c
+++ b/src/mainboard/google/veyron_jerry/bootblock.c
@@ -20,6 +20,7 @@
#include <arch/io.h>
#include <bootblock_common.h>
+#include <delay.h>
#include <soc/clock.h>
#include <soc/i2c.h>
#include <soc/grf.h>
@@ -32,11 +33,16 @@
void bootblock_mainboard_init(void)
{
- /* cpu frequency will up to 1.8GHz, so the buck1 must up to 1.3v */
+ /* Up VDD_CPU (BUCK1) to 1.4V to support max CPU frequency (1.8GHz). */
setbits_le32(&rk3288_pmu->iomux_i2c0scl, IOMUX_I2C0SCL);
setbits_le32(&rk3288_pmu->iomux_i2c0sda, IOMUX_I2C0SDA);
i2c_init(PMIC_BUS, 400*KHz);
- rk808_configure_buck(PMIC_BUS, 1, 1300);
+
+ /* Slowly raise to max CPU voltage to prevent overshoot */
+ rk808_configure_buck(PMIC_BUS, 1, 1200);
+ udelay(175);/* Must wait for voltage to stabilize,2mV/us */
+ rk808_configure_buck(PMIC_BUS, 1, 1400);
+ udelay(100);/* Must wait for voltage to stabilize,2mV/us */
rkclk_configure_cpu();
/* i2c1 for tpm */