To reduce LCD dma interruption (i.e. LCD artifacts during pcmcia transfers) we
can raise it's priority
by means of LCSBSCNTR and ARB_CNTRL registers.
I used the following values on c3000:
LCDBSCNTR = 2
ARB_CNTRL = 0x01800f11
Those registers can be set in spitc.c/common_init, but I guess that the pm code
patched to restore regs after suspend.
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