Re: More information on ATI IXP failure in git9

[Andi Kleen <ak@suse.de>]

On Monday 26 June 2006 10:57, Tejun Heo wrote:
> Tejun Heo wrote:
> > Hello, Andi.
> > 
> > Andi Kleen wrote:
> >> Still doesn't work with it - see 
> >> http://one.firstfloor.org/~andi/sata3.jpg
> > 
> > * SATA_IRQ bit is stuck (on all other sil controllers, this gets cleared 
> > when SError is cleared)
> > 
> > * whenever interrupt occurs (from itself or from any other ones sharing 
> > the IRQ), irq handler sees SATA_IRQ bit set and thus thinks it just 
> > received phy status changed IRQ.
> > 
> > * phy status change aborts the active command, so no command gets 
> > completed.
> > 
> > I'm attaching two patches.  The first one tries to clear SATA_IRQ by 
> > writing 1 to it in thaw() assuming the bit is implemented as W1C (which 
> > BTW is out of spec).  The second one kills SATA_IRQ handling completely. 
> >  I wish the first one works but if not I'll update the second one such 
> > that it applies only to ATI IXP.
> 
> And another one, just in case they were crazy enough to implement the 
> bit as RW.

patch0 + this one also don't work (zero err_mask etc.) 

-Andi