linux-kernel - Re: [PATCH] sil3531: has no PM capability, remove support.

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Message-ID: <4F82F765.4010705@pobox.com>
Date:	Mon, 09 Apr 2012 10:51:17 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	philby john <pjohn@...sta.com>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	htejun@...il.com
Subject: Re: [PATCH] sil3531: has no PM capability, remove support.

On 04/09/2012 10:14 AM, philby john wrote:
> From: Philby John<pjohn@...sta.com>
> Date: Mon, 9 Apr 2012 19:09:51 +0530
> Subject: [PATCH] sil3531: has no PM capability, remove support.
>
> SATA sil3531 does not support Power Management Capability and
> as per the manual Bit [31:27] is hardwired to 00h.
> Otherwise, when the device goes into suspend/resume the Power
> Management Control + Status registers are accessed and the
> arch specific readl()/__raw_readl() calls block indefinitely.
>
> This patch sets the PCI_DEV_FLAGS_NO_D3 flag by which the if
> condition in pci_set_power_state() evaluates to true and
> pci_raw_set_power_state() functions are not executed.
>
> Signed-off-by: Philby John<pjohn@...sta.com>
> Signed-off-by: Johnny Chiang<Johnny.Chiang@...iumnetworks.com>
> ---
>   drivers/pci/pci.c |    1 +
>   1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 8156744..129120d 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -1863,6 +1863,7 @@ void pci_pm_init(struct pci_dev *dev)
>   		pci_pme_active(dev, false);
>   	} else {
>   		dev->pme_support = 0;
> +		dev->dev_flags |= PCI_DEV_FLAGS_NO_D3;

This patch applies to -every- piece of PCI hardware out there, not just 
the sil3531...

	Jeff




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