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

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Date:	Sat, 8 Mar 2008 23:47:09 +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 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"?

Thanks
Guennadi
---
Guennadi Liakhovetski
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