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Message-ID: <CAJZ5v0jvaT1XR0_BDAvg70CHhNjZ+KHEe7pgewaSBaaqROGpOQ@mail.gmail.com>
Date: Mon, 21 Aug 2023 20:36:40 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
Iain Lane <iain@...ngesquash.org.uk>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: Re: [PATCH v14.c 2/4] PCI: ACPI: Consider non-hotplug bridges for D3
in acpi_pci_bridge_d3()
On Fri, Aug 18, 2023 at 9:40 PM Mario Limonciello
<mario.limonciello@....com> wrote:
>
> acpi_pci_bridge_d3() only runs on hotplug bridges. Two checks are made
> for _S0W and for whether a device is power manageable contingent upon
> an ACPI companion being present.
>
> These checks also make sense for non-hotplug bridges, so move the
> check for hotplug bridge after the acpi companion checks.
>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Looks reasonable to me.
Acked-by: Rafael J. Wysocki <rafael@...nel.org>
> ---
> drivers/pci/pci-acpi.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
> index b5b65cdfa3b8b..64e6ada024235 100644
> --- a/drivers/pci/pci-acpi.c
> +++ b/drivers/pci/pci-acpi.c
> @@ -1017,7 +1017,7 @@ bool acpi_pci_bridge_d3(struct pci_dev *dev)
> struct acpi_device *adev, *rpadev;
> const union acpi_object *obj;
>
> - if (acpi_pci_disabled || !dev->is_hotplug_bridge)
> + if (acpi_pci_disabled)
> return false;
>
> adev = ACPI_COMPANION(&dev->dev);
> @@ -1039,6 +1039,9 @@ bool acpi_pci_bridge_d3(struct pci_dev *dev)
> return true;
> }
>
> + if (!dev->is_hotplug_bridge)
> + return false;
> +
> rpdev = pcie_find_root_port(dev);
> if (!rpdev)
> return false;
> --
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