Re: [RFC] mmc: sdhci: work around broken dma boundary behavior

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>From Chris Ball:

> > Some SD host  controllers (noticed on an integrated JMicron
> > SD reader on an HP  Pavilion dv5-1250eo laptop) don't update
> > the dma address register before  signaling a dma interrupt due
> > to a dma boundary. Update the register  manually to the next
> > boundary (by default 512KiB), at which the transfer  stopped.
> >
> > As long as each transfer is at most 512KiB in size  (guaranteed
> > by a BUG_ON in sdhci_prepare_data()) and the boundary is  kept
> > at the default value, this fix is needed at most once per
> >  transfer. Smaller boundaries are taken care of by counting
> > the  transferred bytes.
> >
> > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=28462
> >
> >  Signed-off-by: Mikko Vinni <mmvinni@xxxxxxxxx>
> 
> I know you  posted this as an RFC, but I've pushed it to mmc-next for
> testing now, and  will plan on merging it for .40 if everything goes well.

Ok, thanks.

Mikko


> Thanks very  much!
> 
> - Chris.
> 


      
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