linux-kernel - Re: [PATCH V6 1/3] PCI/ASPM: Add pci_enable_default_link

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Date:   Tue, 1 Mar 2022 00:13:43 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     "David E. Box" <david.e.box@...ux.intel.com>
Cc:     nirmal.patel@...ux.intel.com, jonathan.derrick@...ux.dev,
        lorenzo.pieralisi@....com, hch@...radead.org, kw@...ux.com,
        robh@...nel.org, bhelgaas@...gle.com,
        michael.a.bottini@...ux.intel.com, rafael@...nel.org,
        me@...ityamohan.in, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 1/3] PCI/ASPM: Add pci_enable_default_link_state()

On Mon, Feb 28, 2022 at 08:19:41PM -0800, David E. Box wrote:
> +	down_read(&pci_bus_sem);
> +	mutex_lock(&aspm_lock);
> +	link->aspm_default = 0;
> +	if (state & PCIE_LINK_STATE_L0S)
> +		link->aspm_default |= ASPM_STATE_L0S;
> +	if (state & PCIE_LINK_STATE_L1)
> +		/* L1 PM substates require L1 */
> +		link->aspm_default |= ASPM_STATE_L1 | ASPM_STATE_L1SS;
> +	if (state & PCIE_LINK_STATE_L1_1)
> +		link->aspm_default |= ASPM_STATE_L1_1;
> +	if (state & PCIE_LINK_STATE_L1_2)
> +		link->aspm_default |= ASPM_STATE_L1_2;
> +	if (state & PCIE_LINK_STATE_L1_1_PCIPM)
> +		link->aspm_default |= ASPM_STATE_L1_1_PCIPM;
> +	if (state & PCIE_LINK_STATE_L1_2_PCIPM)
> +		link->aspm_default |= ASPM_STATE_L1_2_PCIPM;
> +	pcie_config_aspm_link(link, policy_to_aspm_state(link));

Is there any reason the ASPM_* values aren't passed directly to this
function?