diff options
| author | Ranjani Vaidyanathan <ra5478@freescale.com> | 2012-09-02 10:32:35 -0500 |
|---|---|---|
| committer | Ranjani Vaidyanathan <ra5478@freescale.com> | 2012-09-03 01:27:41 -0500 |
| commit | f3ff4c24af4d5bff0bb275e79c779c22d1263797 (patch) | |
| tree | 5da0573f4e5c010745143d494e44f8f207ea75e2 | |
| parent | d81da79b27f8205c915b9ab78972742964e6436a (diff) | |
ENGR00222834 MX6x-A9 prefetcher should not access DDR before IO is restored
Add enough nops to suspend code when exiting due to a pending
interrupt. This is required so that we can guarantee that the
prefetch unit will not bring DDR out of self-refresh before
all of the DDR's IO pads are restored.
Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
| -rw-r--r-- | arch/arm/mach-mx6/mx6_suspend.S | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/arm/mach-mx6/mx6_suspend.S b/arch/arm/mach-mx6/mx6_suspend.S index 0b9dc57b0091..0533ad1b20ef 100644 --- a/arch/arm/mach-mx6/mx6_suspend.S +++ b/arch/arm/mach-mx6/mx6_suspend.S @@ -884,6 +884,40 @@ sl_io_restore: sl_ddr_io_restore ddr_io_restore_done: + /* Add enough nops so that the + * prefetcher will not get instructions + * from DDR before its IO pads + * are restored. + */ + nop + nop + nop + nop + nop + + nop + nop + nop + nop + nop + + nop + nop + nop + nop + nop + + nop + nop + nop + nop + nop + + nop + nop + nop + nop + nop mrc p15, 0, r1, c1, c0, 0 orr r1, r1, #(1 << 2) @ Enable the C bit |