From: Catalin Marinas <catalin.marinas@arm.com>
Date: Mon, 21 Jun 2010 14:10:07 +0000 (+0100)
Subject: ARM: 6188/1: Add a config option for the ARM11MPCore DMA cache maintenance workaround
X-Git-Tag: v2.6.35-rc4~1^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad642d9f58f1af6e96efccb5f84e52c6d01db5c4;p=pandora-kernel.git

ARM: 6188/1: Add a config option for the ARM11MPCore DMA cache maintenance workaround

Commit f4d6477f introduced a workaround for the lack of hardware
broadcasting of the cache maintenance operations on ARM11MPCore.
However, the workaround is only valid on CPUs that do not do speculative
loads into the D-cache.

This patch adds a Kconfig option with the corresponding help to make the
above clear. When the DMA_CACHE_RWFO option is disabled, the kernel
behaviour is that prior to the f4d6477f commit. This also allows ARMv6
UP processors with speculative loads to work correctly.

For other processors, a different workaround may be needed.

Cc: Ronen Shitrit <rshitrit@marvell.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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