Subject: Re: [PATCH][V2] powerpc/fsl-pci: Add PCI controller ATMU PM support

From: Timur Tabi <[email-masked]>
Date: Wed, 7 Nov 2012 09:57:46 -0600

Jia Hongtao wrote:
> Power supply for PCI controller ATMU registers is off when system go to
> deep-sleep state. So ATMU registers should be re-setup during PCI
> controllers resume from sleep.
> 
> Signed-off-by: Jia Hongtao <[email-masked]>
> Signed-off-by: Li Yang <[email-masked]>
> ---
>  arch/powerpc/sysdev/fsl_pci.c |   37 +++++++++++++++++++++++++++++++++++--
>  1 files changed, 35 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
> index ffb93ae..e6ab952 100644
> --- a/arch/powerpc/sysdev/fsl_pci.c
> +++ b/arch/powerpc/sysdev/fsl_pci.c
> @@ -89,7 +89,7 @@ static int fsl_pci_dma_set_mask(struct device *dev, u64 dma_mask)
>  	return 0;
>  }
>  
> -static int __init setup_one_atmu(struct ccsr_pci __iomem *pci,
> +static int setup_one_atmu(struct ccsr_pci __iomem *pci,
>  	unsigned int index, const struct resource *res,
>  	resource_size_t offset)
>  {
> @@ -126,7 +126,7 @@ static int __init setup_one_atmu(struct ccsr_pci __iomem *pci,
>  }
>  
>  /* atmu setup for fsl pci/pcie controller */
> -static void __init setup_pci_atmu(struct pci_controller *hose,
> +static void setup_pci_atmu(struct pci_controller *hose,
>  				  struct resource *rsrc)
>  {
>  	struct ccsr_pci __iomem *pci;
> @@ -902,9 +902,42 @@ static int __devinit fsl_pci_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM
> +static int fsl_pci_resume(struct device *dev)
> +{
> +	struct pci_controller *hose;
> +	struct resource pci_rsrc;
> +
> +	hose = pci_find_hose_for_OF_device(dev->of_node);
> +	if (!hose)
> +		return -ENODEV;
> +
> +	if (of_address_to_resource(dev->of_node, 0, &pci_rsrc)) {
> +		pr_warning("Get pci register base failed");
> +		return -ENOMEM;

dev_err

and it's not -ENOMEM.  ENOMEM means that you've run out of memory.  This
should also be ENODEV.

> +	}
> +
> +	setup_pci_atmu(hose, &pci_rsrc);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops pci_pm_ops = {
> +	.resume = fsl_pci_resume,
> +};
> +
> +#define PCI_PM_OPS (&pci_pm_ops)
> +
> +#else
> +
> +#define PCI_PM_OPS NULL
> +
> +#endif
> +
>  static struct platform_driver fsl_pci_driver = {
>  	.driver = {
>  		.name = "fsl-pci",
> +		.pm = PCI_PM_OPS,
>  		.of_match_table = pci_ids,
>  	},
>  	.probe = fsl_pci_probe,
> 

-- 
Timur Tabi
Linux kernel developer at Freescale