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authorCatalin Marinas <catalin.marinas@arm.com>2008-11-10 14:14:11 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2008-11-10 14:14:11 +0000
commit8553cb67d2318db327071018fc81084cbabccc46 (patch)
treef2db64a188cbf2cce745720bf3d279daa2768609 /arch/arm/mm/proc-v7.S
parent73b63efaac7352c9e2bf1570fac98fd44a99f8f9 (diff)
downloadop-kernel-dev-8553cb67d2318db327071018fc81084cbabccc46.zip
op-kernel-dev-8553cb67d2318db327071018fc81084cbabccc46.tar.gz
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.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 721b7d5..0e11d97 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)
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