On Sad, 2005-05-28 at 14:38, Pierre Ossman wrote:
> I've been having some problems with ISA DMA transfers failing. They work
> fine until the machine does a suspend-to-ram. After that all DMA
> transfers stall. Does perhaps the DMA controller need a kick in the ***
> after a suspend? I'm no expert on the ISA DMA controller so I could use
> some help here.
The DMA controller has some bits of state which are potentially in need
of restoration as well as a need to ensure you don't suspend while it is
running I would imagine. Even for bus masters I believe you would need
to restore the DMA enable bits.
See include/asm-i386/dma.h but note that some registers have side
effects and the dma_outb etc are used to get required delays on some PCs
Alan
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