Ashish Singhal b074eb78b4 MdeModulePkg/PciBusDxe: Add optional CRS retry for enumeration ... The current PciDevicePresent() implementation skips PCIe devices that return Configuration Request Retry Status (CRS) during enumeration. This causes devices that are slow to initialize (e.g., after power-on or reset) to be missed entirely. Per PCIe Base Specification Rev 3.1 Section 2.3.1, when CRS Software Visibility is enabled and a device returns CRS, the Root Complex reports Vendor ID as 0x0001. The specification recommends software retry the configuration read until the device becomes ready. This patch adds optional CRS retry support controlled by PCDs: - PcdPciCrsRetryIntervalUs: Retry interval in microseconds (default 10000) - PcdPciCrsTimeoutSeconds: Total timeout in seconds (default 0) By default (PcdPciCrsTimeoutSeconds=0), CRS retry is disabled and devices returning CRS are skipped during enumeration. Platforms requiring CRS retry support should set PcdPciCrsTimeoutSeconds to a non-zero value. Additional improvements: - Add PCI_VENDOR_ID_NONE and PCI_VENDOR_ID_CRS macros for readability - Handle invalid PCD configurations (e.g., zero retry interval) - Add DEBUG output for CRS detection, successful retry, and timeout Signed-off-by: Ashish Singhal <ashishsingha@nvidia.com>		2026-03-17 02:03:32 +00:00
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Ata	MdeModulePkg: Replace include guards with #pragma once	2026-02-23 21:01:28 +00:00
I2c/I2cDxe	MdeModulePkg: Replace include guards with #pragma once	2026-02-23 21:01:28 +00:00
Isa	MdeModulePkg: Replace include guards with #pragma once	2026-02-23 21:01:28 +00:00
Pci	MdeModulePkg/PciBusDxe: Add optional CRS retry for enumeration	2026-03-17 02:03:32 +00:00
Scsi	MdeModulePkg: Replace include guards with #pragma once	2026-02-23 21:01:28 +00:00
Sd	MdeModulePkg: Replace include guards with #pragma once	2026-02-23 21:01:28 +00:00
Spi	MdeModulePkg: Replace include guards with #pragma once	2026-02-23 21:01:28 +00:00
Ufs	MdeModulePkg: Replace include guards with #pragma once	2026-02-23 21:01:28 +00:00
Usb	MdeModulePkg: Replace include guards with #pragma once	2026-02-23 21:01:28 +00:00