linux-kernel - Re: 2.6.18-rc7-git1: AHCI not seeing devices on ICH8 mobo (DG965RY)

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Date:	Sun, 17 Sep 2006 20:48:26 -0700
From:	"Robin H. Johnson" <robbat2@...too.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	"Robin H. Johnson" <robbat2@...too.org>,
	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.18-rc7-git1: AHCI not seeing devices on ICH8 mobo (DG965RY)

On Sun, Sep 17, 2006 at 04:49:29PM +0900, Tejun Heo wrote:
> On Sat, Sep 16, 2006 at 02:08:57PM -0700, Robin H. Johnson wrote:
> > I recompiled libata and AHCI using the ATA_DEBUG and ATA_VERBOSE_DEBUG
> > defines, and got an interesting trace.
> > 
> > In specific, look at port_idx 2/3, being all zeros in ahci_host_init.
> > 
> > I'm digging into it further now, but something makes me suspect that
> > base addresses for ports 3/4 are wrong.
> > 
> > Full file at:
> > http://orbis-terrarum.net/~robbat2/x86_64-mmconfig-failure/2.6.18-rc7-git1-libata-ahci-verbose-failure.dmesg
> 
> Can you please try the attached patch?
Yes your patch fixes it perfectly - it's a better version of an almost
working fix I hacked up after my previous email.

Some patch review comments below as well.

Signed-off-by: Robin H. Johnson <robbat2@...too.org>

> @@ -186,9 +187,11 @@ struct ahci_host_priv {
>  	unsigned long		flags;
>  	u32			cap;	/* cache of HOST_CAP register */
>  	u32			port_map; /* cache of HOST_PORTS_IMPL reg */
> +	int			port_tbl[AHCI_MAX_PORTS];
>  };
maybe u8 instead of int?
also a comment - /* mapping of port_idx to the implemented port */

> +	if (n_ports == 0) {
> +		dev_printk(KERN_ERR, &pdev->dev, "0 port implemented\n");
> +		return -EINVAL;
> +	}
Use plural form (0 ports), or negative (No ports) instead.

-- 
Robin Hugh Johnson
E-Mail     : robbat2@...too.org
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

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