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| author |   Catalin Marinas <catalin.marinas@arm.com> | 2008-11-10 14:14:11 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2008-11-10 14:14:11 +0000 |
| commit | 8553cb67d2318db327071018fc81084cbabccc46 (patch) | |
| tree | f2db64a188cbf2cce745720bf3d279daa2768609 /arch/arm/mm/proc-v7.S | |
| parent | ARMv7: Add SMP initialisation to proc-v7.S (diff) | |
| download | linux-dev-8553cb67d2318db327071018fc81084cbabccc46.tar.xz linux-dev-8553cb67d2318db327071018fc81084cbabccc46.zip | |
Modern processors may need to drain the WB before WFI
Since WFI may cause the processor to enter a low-power mode, data may
still be in the write buffer. This patch adds a DSB (or DWB) to the
cpu_(v6|v7)_do_idle functions before the WFI.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm/mm/proc-v7.S')
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 721b7d53bfd8..0e11d9716a7d 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -63,6 +63,7 @@ ENDPROC(cpu_v7_reset) * IRQs are already disabled. */ ENTRY(cpu_v7_do_idle) + dsb @ WFI may enter a low-power mode wfi mov pc, lr ENDPROC(cpu_v7_do_idle) |