xilinx_intc: Fix writes into MER register
The MER register only has two valid bits. This is now used by the linux kernel to auto-detect endianness, and causes Linux 3.15-rc1 and later to hang when run under qemu-microblaze. Mask valid bits before writing the register to solve the problem. Signed-off-by: NGuenter Roeck <linux@roeck-us.net> Reviewed-by: NEdgar E. Iglesias <edgar.iglesias@gmail.com> [Edgar: Untabified] Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@gmail.com>
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