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fix(plat/allwinner): delay after enabling CPU power

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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>
This commit is contained in:
Icenowy Zheng 2021-07-22 09:32:57 +08:00 • committed by Icenowy Zheng
parent 9fcefe38d5
commit 86a7429e47
1 changed files with 1 additions and 0 deletions
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plat/allwinner/common/sunxi_cpu_ops.c
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@ -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. */