linux-kernel - Re: [PATCH[RFC] Quirk macbook pro 6,2 into ahci mode

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Message-ID: <4C442549.4030006@kernel.org>
Date:	Mon, 19 Jul 2010 12:13:29 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Jens Axboe <jaxboe@...ionio.com>
CC:	Jeff Garzik <jgarzik@...ox.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH[RFC] Quirk macbook pro 6,2 into ahci mode

Hello,

On 07/19/2010 02:25 AM, Jens Axboe wrote:
> +static void pch_update_bar(struct pci_dev *pdev)
> +{
> +	if (pcim_iomap_regions(pdev, 1 << 5, "AHCI quirk")) {
> +		int ret;
> +
> +		printk("AHCI BAR not set - attempting to program... ");
> +		pdev->resource[5].flags = IORESOURCE_MEM;
> +		ret = pci_allocate_resource(pdev, 5);
> +		if (ret)
> +			printk (KERN_INFO "Failed to allocate new region\n");
> +		else
> +			printk (KERN_INFO "Succeeded\n");
> +	} else
> +		pcim_iounmap_regions(pdev, 1 << 5);
> +}

Hmm... as the firmware is setting up the resource during boot,
wouldn't it be better to save it and restore it during resume?  That
would be simpler and more robust.

Thanks.

-- 
tejun
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