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rockchip/rk3399: set kevin rev3 pwm regulator initial value to 0.95v 

kevin rev3 pwm regulator ripple is still not great, especially for
center logic. To make sdram at 800MHz stable, raise it to 0.95v.

BRANCH=none
BUG=chrome-os-partner:54871
TEST=run "stressapptest -M 1024 -s 1000" on kevin board and pass

Change-Id: If4a15eb7398eea8214cb58422bca7cfb5f4a051a
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: d29bc581effb0008eb196685aa22dd65b5d478a5
Original-Change-Id: Ideec9c3ab2f919af732719ed2f6a702068d99c8f
Original-Signed-off-by: Lin Huang <hl@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/359130
Original-Commit-Ready: Douglas Anderson <dianders@chromium.org>
Original-Reviewed-by: Douglas Anderson <dianders@chromium.org>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/15659
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Lin Huang 2016-07-08 14:30:18 +08:00 committed by Martin Roth
parent 0562783182
commit a406c2a954
1 changed files with 10 additions and 4 deletions
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14
src/soc/rockchip/rk3399/romstage.c
View File

@ -41,6 +41,7 @@ static void init_dvs_outputs(void)
{ {
int duty_ns; int duty_ns;
uint32_t i; uint32_t i;
uint32_t id;
write32(&rk3399_grf->iomux_pwm_0, IOMUX_PWM_0); /* GPU */ write32(&rk3399_grf->iomux_pwm_0, IOMUX_PWM_0); /* GPU */
write32(&rk3399_grf->iomux_pwm_1, IOMUX_PWM_1); /* Big */ write32(&rk3399_grf->iomux_pwm_1, IOMUX_PWM_1); /* Big */
@ -76,10 +77,15 @@ static void init_dvs_outputs(void)
* period = 3337, volt = 1.0: 2383 * period = 3337, volt = 1.0: 2383
* period = 3337, volt = 0.9: 2860 * period = 3337, volt = 0.9: 2860
*/ */
if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN) && (board_id() <= 2)) duty_ns = 2860; /* 0.9v */
duty_ns = 1906; /* 1.1v */
else if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN)) {
duty_ns = 2860; /* 0.9v */ id = board_id();
if (id <= 2)
duty_ns = 1906; /* 1.1v */
else if (id == 3)
duty_ns = 2621; /* 0.95v */
}
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
pwm_init(i, 3337, duty_ns); pwm_init(i, 3337, duty_ns);