linux-kernel - Re: [PATCH v3 06/10] PCI/PTM: Add pci_enable

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Date:   Thu, 8 Sep 2022 13:18:23 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Rajvi Jingar <rajvi.jingar@...ux.intel.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>
Cc:     Koba Ko <koba.ko@...onical.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "David E . Box" <david.e.box@...ux.intel.com>,
        linux-pci@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v3 06/10] PCI/PTM: Add pci_enable_ptm() wrapper



On 9/6/22 3:23 PM, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> Implement pci_enable_ptm() as a wrapper around an internal
> __pci_enable_ptm() that we can use during resume to enable PTM without
> emitting log messages.

Also add a note about not updating ptm_enabled in __pci_enable_ptm()

> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  drivers/pci/pcie/ptm.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
> index 762299984469..4a9f045126ca 100644
> --- a/drivers/pci/pcie/ptm.c
> +++ b/drivers/pci/pcie/ptm.c
> @@ -152,7 +152,7 @@ void pci_ptm_init(struct pci_dev *dev)
>  		pci_enable_ptm(dev, NULL);
>  }
>  
> -int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
> +static int __pci_enable_ptm(struct pci_dev *dev)
>  {
>  	int ptm = dev->ptm_cap;
>  	struct pci_dev *ups;
> @@ -177,6 +177,17 @@ int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
>  		ctrl |= PCI_PTM_CTRL_ROOT;
>  
>  	pci_write_config_dword(dev, ptm + PCI_PTM_CTRL, ctrl);
> +	return 0;
> +}
> +
> +int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
> +{
> +	int rc;
> +
> +	rc = __pci_enable_ptm(dev);
> +	if (rc)
> +		return rc;
> +
>  	dev->ptm_enabled = 1;
>  
>  	pci_ptm_info(dev);

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer