[PATCH] arm64: Extend workaround for erratum 1024718 to all versions of Cortex-A55

Suzuki K Poulose suzuki.poulose at arm.com
Wed Feb 3 18:00:57 EST 2021

The erratum 1024718 affects Cortex-A55 r0p0 to r2p0. However
we apply the work around for r0p0 - r1p0. Unfortunately this
won't be fixed for the future revisions for the CPU. Thus
extend the work around for all versions of A55, to cover
for r2p0 and any future revisions.

Cc: stable at vger.kernel.org
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: James Morse <james.morse at arm.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko at socionext.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
 arch/arm64/kernel/cpufeature.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index e99eddec0a46..db400ca77427 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1455,7 +1455,7 @@ static bool cpu_has_broken_dbm(void)
 	/* List of CPUs which have broken DBM support. */
 	static const struct midr_range cpus[] = {
 #ifdef CONFIG_ARM64_ERRATUM_1024718
-		MIDR_RANGE(MIDR_CORTEX_A55, 0, 0, 1, 0),  // A55 r0p0 -r1p0
 		/* Kryo4xx Silver (rdpe => r1p0) */

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