linux-kernel - [ 53/68] ARM: 7345/1: errata: update workaround for A9 erratum #743622

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Date:	Fri, 09 Mar 2012 11:03:07 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Russell King <rmk+kernel@....linux.org.uk>,
	Will Deacon <will.deacon@....com>
Subject: [ 53/68] ARM: 7345/1: errata: update workaround for A9 erratum #743622

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Will Deacon <will.deacon@....com>

commit efbc74ace95338484f8d732037b99c7c77098fce upstream.

Erratum #743622 affects all r2 variants of the Cortex-A9 processor, so
ensure that the workaround is applied regardless of the revision.

Reported-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/Kconfig      |    2 +-
 arch/arm/mm/proc-v7.S |    4 +---
 2 files changed, 2 insertions(+), 4 deletions(-)

--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1179,7 +1179,7 @@ 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
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -344,9 +344,7 @@ __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


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