From ea58440a8d25fb3be58af9a2fc7c31675d94843e Mon Sep 17 00:00:00 2001
From: Aaron Wu <Aaron.wu@analog.com>
Date: Wed, 22 Oct 2014 13:45:58 +0800
Subject: [PATCH] pm: sometimes wake up from suspend to RAM would fail

Sometimes it fails to wake up from suspend to RAM, this is because
we would flush the data cache by assemble command FLUSHINV before
suspend to RAM, and there is a delay between this command execution
and cache flush completion. Add a 1uS delay to works around this.

Signed-off-by: Aaron Wu <Aaron.wu@analog.com>
---
 arch/blackfin/mach-common/pm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/blackfin/mach-common/pm.c b/arch/blackfin/mach-common/pm.c
index 1387a94bcfd5a..a66d979ec6512 100644
--- a/arch/blackfin/mach-common/pm.c
+++ b/arch/blackfin/mach-common/pm.c
@@ -14,6 +14,7 @@
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/irq.h>
+#include <linux/delay.h>
 
 #include <asm/cplb.h>
 #include <asm/gpio.h>
@@ -180,6 +181,7 @@ int bfin_pm_suspend_mem_enter(void)
 
 #if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
 	flushinv_all_dcache();
+	udelay(1);
 #endif
 	_disable_dcplb();
 	_disable_icplb();
-- 
2.39.5