From b7588e3bdcdb2ee073a6a66a4c882b23feaaa0e6 Mon Sep 17 00:00:00 2001 From: Nitin Garg Date: Wed, 2 Apr 2014 08:55:02 -0500 Subject: ARM: Add workaround for Cortex-A9 errata 761320 Full cache line writes to the same memory region from at least two processors might deadlock the processor. Exists on r1, r2, r3 revisions. Signed-off-by: Nitin Garg Acked-by: Fabio Estevam --- arch/arm/cpu/armv7/start.S | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/arm/cpu/armv7') diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index f3830c8471..27be451a89 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -222,6 +222,11 @@ ENTRY(cpu_init_cp15) orr r0, r0, #1 << 11 @ set bit #11 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register #endif +#ifdef CONFIG_ARM_ERRATA_761320 + mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register + orr r0, r0, #1 << 21 @ set bit #21 + mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register +#endif mov pc, lr @ back to my caller ENDPROC(cpu_init_cp15) -- cgit