linux-kernel - Re: Unknown SATA PIIX PCI device ID 0x29b6

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Date:	Sun, 9 Mar 2008 22:24:04 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Tejun Heo <htejun@...il.com>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>, linux-ide@...r.kernel.org
Subject: Re: Unknown SATA PIIX PCI device ID 0x29b6

On Sun, 9 Mar 2008, Tejun Heo wrote:

> Guennadi Liakhovetski wrote:
> > On Fri, 7 Mar 2008, Tejun Heo wrote:
> > 
> >>> Looks like almost a minute to me? On another occurence I see about 1.5 
> >>> minutes, then "port is slow to respond, please be patient (Status 0x80)" 
> >>> has been repeated 3 times. On cold-plug also 3 times, I think, about the 
> >>> same time then (time is not updated in the log).
> >> I see.  Does the attached patch make any difference?
> > 
> > diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> > index 4fbcce7..abebdcc 100644
> > --- a/drivers/ata/libata-core.c
> > +++ b/drivers/ata/libata-core.c
> > @@ -6712,6 +6712,7 @@ int sata_link_init_spd(struct ata_link *link)
> >  	spd = (scontrol >> 4) & 0xf;
> >  	if (spd)
> >  		link->hw_sata_spd_limit &= (1 << spd) - 1;
> > +	link->hw_sata_spd_limit = 1;
> >  
> >  	ata_force_spd_limit(link);
> >  
> > Hm, this would force 1.5Gbps on all ports and devices, right? Cannot I 
> > just boot with "libata.force=4:1.5Gbps"?
> 
> Yeap, you can do that.  Wasn't sure you were using .25-rc or .24.

Yctually it was 2.6.24 before, rebuilt 2.6.25-rc4, booted as above, it did 
say:

ata4: FORCE: PHY spd limit set to 1.5Gbps

but hot-plugging the drive still took 50 seconds to recover.

Thanks
Guennadi
---
Guennadi Liakhovetski
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