diff options
| author | Ranjani Vaidyanathan <ra5478@freescale.com> | 2012-09-02 10:32:35 -0500 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2012-09-05 13:14:18 +0800 |
| commit | 4b0fc8e0e6a428e4080a2de6f96d16a522dc5b31 (patch) | |
| tree | 94f6fe26b86734e1d5b994595fc2d86fb606cfbe | |
| parent | 5a1f83697948a0d03176946e121abe52fb19831d (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 |