From: Will Deacon Date: Fri, 24 Feb 2012 11:12:38 +0000 (+0100) Subject: ARM: 7345/1: errata: update workaround for A9 erratum #743622 X-Git-Tag: v3.3-rc7~18^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=efbc74ace95338484f8d732037b99c7c77098fce;p=platform%2Fkernel%2Flinux-stable.git ARM: 7345/1: errata: update workaround for A9 erratum #743622 Erratum #743622 affects all r2 variants of the Cortex-A9 processor, so ensure that the workaround is applied regardless of the revision. Cc: Reported-by: Russell King Signed-off-by: Will Deacon Signed-off-by: Russell King --- diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a48aecc..dfb0312 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1280,7 +1280,7 @@ config ARM_ERRATA_743622 depends on CPU_V7 help This option enables the workaround for the 743622 Cortex-A9 - (r2p0..r2p2) erratum. Under very rare conditions, a faulty + (r2p*) erratum. Under very rare conditions, a faulty optimisation in the Cortex-A9 Store Buffer may lead to data corruption. This workaround sets a specific bit in the diagnostic register of the Cortex-A9 which disables the Store Buffer diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 0404ccb..f1c8486 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -230,9 +230,7 @@ __v7_setup: mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register #endif #ifdef CONFIG_ARM_ERRATA_743622 - teq r6, #0x20 @ present in r2p0 - teqne r6, #0x21 @ present in r2p1 - teqne r6, #0x22 @ present in r2p2 + teq r5, #0x00200000 @ only present in r2p* mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register orreq r10, r10, #1 << 6 @ set bit #6 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register