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authorAaron Wu2014-10-22 13:45:58 +0800
committerSteven Miao2015-04-23 21:34:32 +0800
commitef7dcaf1e7bbf7adaaf45cac1c1d208929fb25e5 (patch)
treeda1b1bfd00bcffd8628ca34082d227e81f43dafa
parentbb717b33aa6b01abcc78c7a18dec343a3bde9574 (diff)
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>
-rw-r--r--arch/blackfin/mach-common/pm.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/pm.c b/arch/blackfin/mach-common/pm.c
index 1387a94bcfd5..a66d979ec651 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();