linux-kernel - Re: [PATCH] pci: enable MSI on 8132

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Date:	Sun, 22 Feb 2009 16:17:20 +0100
From:	Prakash Punnoor <prakash@...noor.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Robert Hancock <hancockrwd@...il.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>, david@...g.hm,
	Matthew Wilcox <matthew@....cx>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org, DL-MPTFusionLinux@....com,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: enable MSI on 8132

On Sonntag 22 Februar 2009 13:54:54 Eric W. Biederman wrote:
> Prakesh could you try this patch instead?
>
> I think the problem is simply that the MCP55 ht mapping capability
> requires an address to be programed into it and it wasn't in your
> case.
>
> It should not hurt to enable one msi ht mapping capability too many.

I tried it, but unfortunately doesn't help. I run into the same issue.

>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index baad093..f7a0370 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -2017,10 +2017,19 @@ static void __devinit ht_enable_msi_mapping(struct
> pci_dev *dev) while (pos && ttl--) {
>  		u8 flags;
>
> -		if (pci_read_config_byte(dev, pos + HT_MSI_FLAGS,
> -					 &flags) == 0) {
> +		if (pci_read_config_byte(dev, pos + HT_MSI_FLAGS, &flags))
> +			return;
> +
> +		if (!(flags & HT_MSI_FLAGS_ENABLE)) {
>  			dev_info(&dev->dev, "Enabling HT MSI Mapping\n");
>
> +			if (!(flags & HT_MSI_FLAGS_FIXED)) {
> +				pci_write_config_dword(dev, pos + HT_MSI_ADDR_LO,
> +					(HT_MSI_FIXED_ADDR & HT_MSI_FIXED_ADDR));
> +				pci_write_config_dword(dev, pos + HT_MSI_ADDR_HI,
> +					(HT_MSI_FIXED_ADDR >> 32));
> +			}
> +
>  			pci_write_config_byte(dev, pos + HT_MSI_FLAGS,
>  					      flags | HT_MSI_FLAGS_ENABLE);
>  		}
> --
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