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

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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: d29bc581ef
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;
uint32_t i;
uint32_t id;
write32(&rk3399_grf->iomux_pwm_0, IOMUX_PWM_0); /* GPU */
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 = 0.9: 2860
*/
if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN) && (board_id() <= 2))
duty_ns = 1906; /* 1.1v */
else
duty_ns = 2860; /* 0.9v */
duty_ns = 2860; /* 0.9v */
if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN)) {
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++)
pwm_init(i, 3337, duty_ns);