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 <icenowy@sipeed.com>
diff --git a/plat/allwinner/common/sunxi_cpu_ops.c b/plat/allwinner/common/sunxi_cpu_ops.c
index 420b507..8a29dbb 100644
--- a/plat/allwinner/common/sunxi_cpu_ops.c
+++ b/plat/allwinner/common/sunxi_cpu_ops.c
@@ -42,6 +42,7 @@
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. */