From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff Garzik <jeff@garzik.org>
Subject: Re: [RFT] sata_promise: intermittent errors bug hunting
Date: Tue, 27 Feb 2007 18:16:11 -0500
Message-ID: <45E4BBBB.90504@garzik.org>
References: <200702272225.l1RMPfSt021674@harpo.it.uu.se>
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To: Mikael Pettersson <mikpe@it.uu.se>
Cc: linux-ide@vger.kernel.org

Mikael Pettersson wrote:
> +	if (hp->flags & PDC_FLAG_GEN_II) {
> +		/* record ASIC rev */
> +		pci_read_config_byte(pdev, PCI_REVISION_ID, &hp->asic_rev);
> +
> +#if 1
> +		/* set cache line size = 1 */
> +		pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &tmp);
> +		printk("%s: changing pci_cache_line_size from %#02x to 0x01\n",
> +		       __FUNCTION__, tmp);
> +		pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x01);
> +#endif


This bit strikes me as somewhat dubious.  If this proves to actually fix 
something, I would start by exporting pci_set_cacheline_size() in 
drivers/pci/pci.c, using it, and seeing if that helps.

	Jeff