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pm: sometimes wake up from suspend to RAM would fail

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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>
This commit is contained in:
Aaron Wu 2014-10-22 13:45:58 +08:00 committed by Steven Miao
parent bb717b33aa
commit ef7dcaf1e7
1 changed files with 2 additions and 0 deletions
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2
arch/blackfin/mach-common/pm.c
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@ -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();