From 86a7429e477786dad6fab002538aef825f4ca35a Mon Sep 17 00:00:00 2001 From: Icenowy Zheng Date: Thu, 22 Jul 2021 09:32:57 +0800 Subject: [PATCH] fix(plat/allwinner): delay after enabling CPU power Adds a 1us delay after enabling power to a CPU core, to prevent inrush-caused CPU crash before it's up. Change-Id: I8f4c1b0dc0d1d976b31ddc30efe7a77a1619b1b3 Signed-off-by: Icenowy Zheng --- plat/allwinner/common/sunxi_cpu_ops.c | 1 + 1 file changed, 1 insertion(+) diff --git a/plat/allwinner/common/sunxi_cpu_ops.c b/plat/allwinner/common/sunxi_cpu_ops.c index 420b507ab..8a29dbbd5 100644 --- a/plat/allwinner/common/sunxi_cpu_ops.c +++ b/plat/allwinner/common/sunxi_cpu_ops.c @@ -42,6 +42,7 @@ static void sunxi_cpu_enable_power(unsigned int cluster, unsigned int core) mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0xe0); mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0x80); mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0x00); + udelay(1); } /* We can't turn ourself off like this, but it works for other cores. */