ARM: 7345/1: errata: update workaround for A9 erratum #743622

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

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b259c7c644e357a9999c3767fd34431d8c39ae8a..ab3740ec79a397f9ab153c61b95b736cefcedda0 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1272,7 +1272,7 @@ 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 40cc7aa1017d0d8040e314299a97d1ddc936bf59..82ef81da155bff96e678584760dfd9ceda3b5a39 100644 (file)
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -352,9 +352,7 @@ __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