[U-Boot] [PATCH] arm/layerscape: Fix non-boot cpus cannot correctly fall in spin table

[Dongsheng Wang]

From: Wang Dongsheng <dongsheng.wang at freescale.com>

Bootrom will put cpus into WFE state when boot cpu release cpus, so
target cpu cannot correctly go to spin state.

Add 'sev' to wakeup non-boot cpu that hold on bootrom space, let target
cpu can fall into u-boot spin table.

Signed-off-by: Wang Dongsheng <dongsheng.wang at freescale.com>

diff --git a/arch/arm/cpu/armv7/ls102xa/cpu.c b/arch/arm/cpu/armv7/ls102xa/cpu.c
index 75f0d8c..1f82893 100644
--- a/arch/arm/cpu/armv7/ls102xa/cpu.c
+++ b/arch/arm/cpu/armv7/ls102xa/cpu.c
@@ -344,5 +344,13 @@ void smp_kick_all_cpus(void)
 	struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
 
 	out_be32(&gur->brrl, 0x2);
+
+	/*
+	 * LS1 STANDBYWFE is not captured outside the ARM module in the soc.
+	 * So add a delay to wait bootrom execute WFE.
+	 */
+	udelay(1);
+
+	asm volatile("sev");
 }
 #endif
-- 
2.1.0.27.g96db324