Hello Everyone,
I am facing a peculiar problem. I am working on the u-wire
interface of OMAP5912. The kernel I am using is pretty old (linux
2.6.16). But it works pretty well for OMAP5912. The u-wire interface
on OMAP5912 supports TX via DMA (RX via DMA is not available). If I
perform the DMA transfer for TX, it works, but very slowly. However,
instead of stopping at a wait_for_completion() for the DMA callback
(complete()) to happen (the usual approach) if I keep the ARM busy
with some kind of register access (not necessarily a u-wire register),
the DMA transfer happens real fast.
Has anyone faced this kind of issue before (not necessarily u-wire
interface). Please share your experience. I am looking for clues.
Best regards,
Uthappa
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