diff options
| author | Lin Huang <hl@rock-chips.com> | 2016-07-08 14:30:18 +0800 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-07-15 00:38:04 +0200 |
| commit | a406c2a954830e8cad2efdd4210f1a240c5342bc (patch) | |
| tree | 7ebc27a4a65364c4a58418f6a93d547ff327faa3 /src/soc/rockchip/rk3399 | |
| parent | 05627831826cab096789bd19f004b33a4cd70c0e (diff) | |
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>
Diffstat (limited to 'src/soc/rockchip/rk3399')
| -rw-r--r-- | src/soc/rockchip/rk3399/romstage.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/src/soc/rockchip/rk3399/romstage.c b/src/soc/rockchip/rk3399/romstage.c index b65a9adc87..11454d3d04 100644 --- a/src/soc/rockchip/rk3399/romstage.c +++ b/src/soc/rockchip/rk3399/romstage.c @@ -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); |