ARM: mvebu: completely disable hardware I/O coherency
The current hardware I/O coherency is known to cause problems with DMA coherent buffers, as it still requires explicit I/O synchronization barriers, which is not compatible with the semantics expected by the Linux DMA coherent buffers API. So, in order to have enough time to validate a new solution based on automatic I/O synchronization barriers, this commit disables hardware I/O coherency entirely. Future patches will re-enable it. Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: <stable@vger.kernel.org> # v3.8+ Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
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