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Commit 42c4dafe authored by Catalin Marinas's avatar Catalin Marinas Committed by Russell King
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ARM: 6202/1: Do not ARM_DMA_MEM_BUFFERABLE on RealView boards with L210/L220 



RealView boards with certain revisions of the L210/L220 cache controller
may have issues (hardware deadlock) with the mandatory barriers (DSB
followed by an L2 cache sync) when ARM_DMA_MEM_BUFFERABLE is enabled.
The patch disables ARM_DMA_MEM_BUFFERABLE for these boards.

Tested-by: default avatarLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 2503a5ec

arch/arm/mm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -813,6 +813,8 @@ config ARM_L1_CACHE_SHIFT 


config ARM_DMA_MEM_BUFFERABLE

	bool "Use non-cacheable memory for DMA" if CPU_V6 && !CPU_V7

	depends on !(MACH_REALVIEW_PB1176 || REALVIEW_EB_ARM11MP || \

		     MACH_REALVIEW_PB11MP)

	default y if CPU_V6 || CPU_V7

	help

	  Historically, the kernel has used strongly ordered mappings to