From 789fcfd7ae1f605826ec9b75b96381aad3ded568 Mon Sep 17 00:00:00 2001 From: Nitin Garg Date: Tue, 31 Mar 2015 20:37:36 -0500 Subject: MLK-10524: iMX6x: Implement workaround for Cortex-A9 errata 845369 Under very rare timing circumstances, transitioning into streaming mode might create a data corruption. Present on Two or more processors or 1 core with ACP, all revisions. This erratum can be worked round by setting bit[22] of the undocumented Diagnostic Control Register to 1. Signed-off-by: Nitin Garg (cherry picked from commit 70ad44e523680de67dd8b7a7505d7f27799980ee) --- arch/arm/cpu/armv7/start.S | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 5ed0f45..db77adb 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -164,6 +164,11 @@ ENTRY(cpu_init_cp15) orr r0, r0, #1 << 21 @ set bit #21 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register #endif +#ifdef CONFIG_ARM_ERRATA_845369 + mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register + orr r0, r0, #1 << 22 @ set bit #22 + mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register +#endif mov r5, lr @ Store my Caller mrc p15, 0, r1, c0, c0, 0 @ r1 has Read Main ID Register (MIDR) -- cgit v1.1