Albert Lee wrote:
Jeff,
Patch 3/3: Fix pdc2027x ATAPI DMA lost irq problem
Description:
Sometimes pdc2027x will lost irq after ATAPI DMA data transfer.
With the previous rule (cmd->request_bufflen % 256), the ATAPI DMA irq
lost
problem still occurs during the test.
Root cause for the irq lost is unknown. I've tried your ATAPI DMA
alignment
patch, but the problem still occurs, even the buffer is aligned. I guess
it is pdc2027x hardware problem.
The following workarounds are adapted from the Promise pdc618 GPL driver.
They seems know about the problem and has the workaround.
I think this needs to be investigated a bit more, but the pdc618 driver
does it, we may need to do this eventually.
Jeff
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