From d1bdef008a33e4e9583606feb8747a4d0d249ef1 Mon Sep 17 00:00:00 2001 From: huang lin Date: Fri, 31 Oct 2014 16:40:42 +0800 Subject: rk3288: slowly raise to max cpu voltage to prevent overshoot slowly raise to max cpu voltage to prevent overshoot, and in our experience,when cpu run in 1.8GHz,the vdd_cpu must up to 1.4V BUG=chrome-os-partner:32716, chrome-os-partner:31896 TEST=Boot on veyron_pinky rev2,check the rk808 buck1 voltage 1400mv and measure the overshoot is 1440mv Change-Id: I759840bd8cf57a5589bf1862d04803f80f804164 Signed-off-by: Patrick Georgi Original-Commit-Id: 567f616ff091883ed3275b407859c9399db981b2 Original-Change-Id: I9bb739b49ae4b4f7a60133fa38b0fe51b95c0d78 Original-Signed-off-by: huang lin Original-Reviewed-on: https://chromium-review.googlesource.com/226753 Original-Reviewed-by: Doug Anderson Original-Reviewed-by: Julius Werner Reviewed-on: http://review.coreboot.org/9408 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/soc/rockchip/rk3288/rk808.c | 1 - 1 file changed, 1 deletion(-) (limited to 'src/soc/rockchip') diff --git a/src/soc/rockchip/rk3288/rk808.c b/src/soc/rockchip/rk3288/rk808.c index aa39b8d5ee..fea64e5ebe 100644 --- a/src/soc/rockchip/rk3288/rk808.c +++ b/src/soc/rockchip/rk3288/rk808.c @@ -98,5 +98,4 @@ void rk808_configure_buck(uint8_t bus, int buck, int millivolts) } rk808_clrsetbits(bus, buck_reg, 0x3f, vsel); rk808_clrsetbits(bus, DCDC_EN, 0, 1 << (buck - 1)); - udelay(225);/* Must wait for voltage to stabilize */ } -- cgit v1.2.3