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SubjectRe: [PATCH v8 2/2] PCI/ACPI: Use device constraints instead of dates to opt devices into D3
Hi,

On Wed, Aug 02, 2023 at 03:10:13PM -0500, Mario Limonciello wrote:
> @@ -3036,11 +3044,8 @@ bool pci_bridge_d3_possible(struct pci_dev *bridge)
> if (dmi_check_system(bridge_d3_blacklist))
> return false;
>
> - /*
> - * It should be safe to put PCIe ports from 2015 or newer
> - * to D3.
> - */
> - if (dmi_get_bios_year() >= 2015)
> + /* the platform indicates in a device constraint that D3 is needed */
> + if (platform_constraint_d3(bridge))

This for sure causes some sort of power regression on the Intel
platforms made after 2015. Why not check for the constraint and:

- If present and enabled, use the desired D-state
- If present and disabled, leave the device in D0
- If not present use the existing cutoff date

?

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