linux-kernel - Re: [PATCH] ata: ahci: power off unused ports

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Message-ID: <20080508233713.GB15377@srcf.ucam.org>
Date:	Fri, 9 May 2008 00:37:13 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc:	jeff@...zik.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: ahci: power off unused ports

On Thu, May 08, 2008 at 04:10:08PM -0700, Kristen Carlson Accardi wrote:

> +static int ahci_is_hotplug_capable(struct ata_port *ap)
> +{
> +	void __iomem *port_mmio = ahci_port_base(ap);
> +	u8 cmd;
> +
> +	if (!ahci_power_save)
> +		return 1;
> +
> +	cmd = readl(port_mmio + PORT_CMD);
> +	return ((cmd & PORT_CMD_HPCP) || (cmd & PORT_CMD_ESP));
> +}

Just out of interest, is this set on laptop bays? (Are any of those even 
native SATA yet?)
-- 
Matthew Garrett | mjg59@...f.ucam.org
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