linux-kernel - Re: [smartmontools-support] inactive SATA drives won't stay in standby or sleep, PATA models did. (fwd)

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Date:	Tue, 21 Oct 2008 13:18:22 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Mikael Pettersson <mikpe@...uu.se>
CC:	Christian Mueller <Christian.Mueller@....com>,
	Bruce Allen <ballen@...vity.phys.uwm.edu>,
	Smartmontools Mailing List 
	<smartmontools-support@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: [smartmontools-support] inactive SATA drives won't stay in standby
 or sleep, PATA models did. (fwd)

Hello, Mikael.

> --- linux-2.6.27/drivers/ata/sata_promise.c.~1~	2008-07-14 10:22:36.000000000 +0200
> +++ linux-2.6.27/drivers/ata/sata_promise.c	2008-10-20 00:20:58.000000000 +0200
> @@ -153,6 +153,7 @@ static void pdc_freeze(struct ata_port *
>  static void pdc_sata_freeze(struct ata_port *ap);
>  static void pdc_thaw(struct ata_port *ap);
>  static void pdc_sata_thaw(struct ata_port *ap);
> +static int pdc_prereset(struct ata_link *link, unsigned long deadline);
>  static void pdc_error_handler(struct ata_port *ap);
>  static void pdc_post_internal_cmd(struct ata_queued_cmd *qc);
>  static int pdc_pata_cable_detect(struct ata_port *ap);
> @@ -175,6 +176,7 @@ static const struct ata_port_operations 
>  	.sff_irq_clear		= pdc_irq_clear,
>  
>  	.post_internal_cmd	= pdc_post_internal_cmd,
> +	.prereset		= pdc_prereset,
>  	.error_handler		= pdc_error_handler,
>  };
>  
> @@ -691,6 +693,12 @@ static void pdc_sata_thaw(struct ata_por
>  	readl(host_mmio + hotplug_offset); /* flush */
>  }
>  
> +static int pdc_prereset(struct ata_link *link, unsigned long deadline)
> +{
> +	pdc_reset_port(link->ap);

I would put this into ->hardreset itself as the controller can also
get out of sync with reality during reset.  Other than that, looks
like the correct approach.

Thanks.

-- 
tejun
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