Messages in this thread |  | | Subject | Re: Linux 2.4.21-pre3-ac4 | From | Benjamin Herrenschmidt <> | Date | 14 Jan 2003 18:52:49 +0100 |
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On Tue, 2003-01-14 at 18:49, Ross Biro wrote: > Benjamin Herrenschmidt wrote: > > >Ok, but PIIX runs on intel platforms with real IOs, so there is no need > >to perform a read... If we go the hwif->IOSYNC() way, we might well set > >it up to no-op on x86 PIO iops by default and read of alt-status on > >other archs if it's safe enough on other controllers/drives... > > > I believe that this will corrupt any inprogress UDMA transfer on the > promise 20265 chip and probably others. It would be better to read the > dma registers for the Promise controllers.
You mean on the chip's other channel ? As we discussed earlier, we don't need to enforce this delay at all for DMA as we wait for the DMA controller to complete in the interrupt anyway. Or did I miss a race ?
Ben.
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