ARM: 7773/1: PJ4B: Add support for errata 4742

This commit fixes the regression on Armada 370 (the kernal hang during
boot) introduced by the commit: "ARM: 7691/1: mm: kill unused
TLB_CAN_READ_FROM_L1_CACHE and use ALT_SMP instead".

When coming out of either a Wait for Interrupt (WFI) or a Wait for
Event (WFE) IDLE states, a specific timing sensitivity exists between
the retiring WFI/WFE instructions and the newly issued subsequent
instructions. This sensitivity can result in a CPU hang scenario.  The
workaround is to insert either a Data Synchronization Barrier (DSB) or
Data Memory Barrier (DMB) command immediately after the WFI/WFE
instruction.

This commit was based on the work of Lior Amsalem, but heavily
modified to apply the errata fix dynamically according to the
processor type thanks to the suggestions of Russell King and Nicolas
Pitre.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Willy Tarreau <w@1wt.eu>
Cc: <stable@vger.kernel.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2651b1da1c56..136f263ed47b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1087,6 +1087,20 @@ if !MMU
 source "arch/arm/Kconfig-nommu"
 endif
 
+config PJ4B_ERRATA_4742
+        bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
+        depends on CPU_PJ4B && MACH_ARMADA_370
+        default y
+        help
+          When coming out of either a Wait for Interrupt (WFI) or a Wait for
+          Event (WFE) IDLE states, a specific timing sensitivity exists between
+          the retiring WFI/WFE instructions and the newly issued subsequent
+          instructions.  This sensitivity can result in a CPU hang scenario.
+          Workaround:
+          The software must insert either a Data Synchronization Barrier (DSB)
+          or Data Memory Barrier (DMB) command immediately after the WFI/WFE
+          instruction
+
 config ARM_ERRATA_326103
         bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
         depends on CPU_V6