linux-kernel - Re: [PATCH] pata_artop: add Power Management support

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Date:	Thu, 13 Oct 2011 16:05:26 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
CC:	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pata_artop: add Power Management support

Hello.

On 13-10-2011 14:59, Bartlomiej Zolnierkiewicz wrote:

> From: Bartlomiej Zolnierkiewicz<bzolnier@...il.com>
> Subject: [PATCH] pata_artop: add Power Management support

> Fixes IDE ->  libata regression.

> There shouldn't be any problems with it as corresponding IDE's host
> driver (aec62xx) has been supporting PCI Power Management since
> Oct 10 2008 (commit feb22b7f "ide: add proper PCI PM support (v2)")
> and IDE PM since Jun 14 2003 (patch v2.5.73 "ide: Power Management").

> Signed-off-by: Bartlomiej Zolnierkiewicz<bzolnier@...il.com>
> ---
> earlier references:
> https://lkml.org/lkml/2009/11/25/314

>   drivers/ata/pata_artop.c |   81 +++++++++++++++++++++++++++++++----------------
>   1 file changed, 54 insertions(+), 27 deletions(-)

> Index: b/drivers/ata/pata_artop.c
> ===================================================================
> --- a/drivers/ata/pata_artop.c
> +++ b/drivers/ata/pata_artop.c
[...]
> @@ -313,6 +313,33 @@ static struct ata_port_operations artop6
>   	.prereset		= artop62x0_pre_reset,
>   };
>
> +static void atp8xx_fixup(struct pci_dev *pdev)
> +{
> +	if (pdev->device == 0x0005)

    This is asking to be *switch* statement instead.

> +		/* BIOS may have left us in UDMA, clear it before libata probe */
> +		pci_write_config_byte(pdev, 0x54, 0);
> +	else if (pdev->device == 0x0008 || pdev->device == 0x0009) {
> +		u8 reg;
> +
> +		/* Mac systems come up with some registers not set as we
> +		   will need them */

    Comment style could be improved...

WBR, Sergei
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