linux-kernel - Re: [PATCH 5/9] cciss: rework pci pm related code for simplification

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Message-ID: <51D23169.1070405@huawei.com>
Date:	Tue, 2 Jul 2013 09:48:25 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Yijing Wang <wangyijing@...wei.com>
CC:	Jens Axboe <axboe@...nel.dk>, Mike Miller <mike.miller@...com>,
	<linux-kernel@...r.kernel.org>, Jiri Kosina <jkosina@...e.cz>,
	<iss_storagedev@...com>
Subject: Re: [PATCH 5/9] cciss: rework pci pm related code for simplification

Hi Jens,
   Sorry to disturb you, do you have any comments for this patch?

Thanks!
Yijing.

On 2013/6/18 16:19, Yijing Wang wrote:
> Use pci core pm interface to simplify code.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> Cc: Mike Miller <mike.miller@...com>
> Cc: iss_storagedev@...com
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/block/cciss.c |   16 +++-------------
>  1 files changed, 3 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> index 62b6c2c..18da685 100644
> --- a/drivers/block/cciss.c
> +++ b/drivers/block/cciss.c
> @@ -4528,9 +4528,6 @@ static int cciss_message(struct pci_dev *pdev, unsigned char opcode,
>  static int cciss_controller_hard_reset(struct pci_dev *pdev,
>  	void * __iomem vaddr, u32 use_doorbell)
>  {
> -	u16 pmcsr;
> -	int pos;
> -
>  	if (use_doorbell) {
>  		/* For everything after the P600, the PCI power state method
>  		 * of resetting the controller doesn't work, so we have this
> @@ -4548,8 +4545,7 @@ static int cciss_controller_hard_reset(struct pci_dev *pdev,
>  		 * this causes a secondary PCI reset which will reset the
>  		 * controller." */
>  
> -		pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
> -		if (pos == 0) {
> +		if (!pdev->pm_cap) {
>  			dev_err(&pdev->dev,
>  				"cciss_controller_hard_reset: "
>  				"PCI PM not supported\n");
> @@ -4557,18 +4553,12 @@ static int cciss_controller_hard_reset(struct pci_dev *pdev,
>  		}
>  		dev_info(&pdev->dev, "using PCI PM to reset controller\n");
>  		/* enter the D3hot power management state */
> -		pci_read_config_word(pdev, pos + PCI_PM_CTRL, &pmcsr);
> -		pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
> -		pmcsr |= PCI_D3hot;
> -		pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
> +		pci_set_power_state(pdev, PCI_D3hot);
>  
>  		msleep(500);
>  
>  		/* enter the D0 power management state */
> -		pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
> -		pmcsr |= PCI_D0;
> -		pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
> -
> +		pci_set_power_state(pdev, PCI_D0);
>  		/*
>  		 * The P600 requires a small delay when changing states.
>  		 * Otherwise we may think the board did not reset and we bail.
> 


-- 
Thanks!
Yijing

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