Re: [PATCH] ata_piix: fix pio/mwdma programming (for testing, don't apply)

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> > Yep and if the BIOS programmed the slave into DMA that might not be ideal.
> 
> How so?  The bit will be programmed by set_dmamode() right after
> set_piomode() is complete.

IFF we also put the device into a DMA mode. A blacklisted device would be
wrong.

> See the difference?  Smart one liners are dangerous.  ?* is _much_
> better than cryptic arithmetic.

Agreed

> 
> >> * MWDMA mode programming cleared udma_mask even when the controller
> >>   doesn't support UDMA.  This doesn't matter for your case.
> > 
> > Or on the actual hardware.
> 
> I was trying to make it more consistent with pio counterpart.  We can
> remove if() from set_piomode too.  Let's just keep things in sync
> between stuff including ide piix driver.

The one you must not touch is the UDMA register rather than added UDMA
bits in older registers.

Alan
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