[edk2-devel] [PATCH v1] MinPlatformPkg: Add PCD PcdMinPciBridgePC00 to support \_SB.PCI0 and \_SB.PC00

[Chen, Aryeh]

Hi Biesheuvel,

The platform which before ADL, like TGL uses \_SB.PCI0, but ADL and later uses \_SB.PC00.
Minplatform should support all platform and Pcd PcdMinPciBridgePC00 can set on OpenBoard.dsc for PCI0 or PC00.

Thanks,
Aryeh

-----Original Message-----
From: Ard Biesheuvel <ardb at kernel.org> 
Sent: Tuesday, January 31, 2023 3:32 PM
To: devel at edk2.groups.io; Chen, Aryeh <aryeh.chen at intel.com>
Cc: Chiu, Chasel <chasel.chiu at intel.com>; Desimone, Nathaniel L <nathaniel.l.desimone at intel.com>; Oram, Isaac W <isaac.w.oram at intel.com>; Gao, Liming <gaoliming at byosoft.com.cn>; Dong, Eric <eric.dong at intel.com>
Subject: Re: [edk2-devel] [PATCH v1] MinPlatformPkg: Add PCD PcdMinPciBridgePC00 to support \_SB.PCI0 and \_SB.PC00

On Tue, 31 Jan 2023 at 06:46, Chen, Aryeh <aryeh.chen at intel.com> wrote:
>
> From: Aryeh Chen <aryeh.chen at intel.com>
>
> REF:https://bugzilla.tianocore.org/show_bug.cgi?id=4329
>
> To add PCD PcdMinPciBridgePC00 to support \_SB.PCI0 and \_SB.PC00 on 
> MinDsdt.asl because PciBridge has modified from \_SB.PCI0 to
> \_SB.PC00 since Client ADL platform.
>
> Signed-off-by: Aryeh Chen <aryeh.chen at intel.com>
> Cc: Chasel Chiu <chasel.chiu at intel.com>
> Cc: Nate DeSimone <nathaniel.l.desimone at intel.com>
> Cc: Isaac Oram <isaac.w.oram at intel.com>
> Cc: Liming Gao <gaoliming at byosoft.com.cn>
> Cc: Eric Dong <eric.dong at intel.com>

Why is this needed?

> ---
>  Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.asl | 4 ++++  
> Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.inf | 1 +
>  Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec       | 3 +++
>  3 files changed, 8 insertions(+)
>
> diff --git a/Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.asl 
> b/Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.asl
> index 4efb8709ac..b7361b6d44 100644
> --- a/Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.asl
> +++ b/Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.asl
> @@ -23,7 +23,11 @@ DefinitionBlock (
>    //---------------------------------------------------------------------------
>    // Begin PCI tree object scope
>    
> //--------------------------------------------------------------------
> -------
> +#if FixedPcdGetBool (PcdMinPciBridgePC00) == 1
> +    Device(PC00) { // PCI Bridge "Host Bridge"
> +#else
>      Device(PCI0) { // PCI Bridge "Host Bridge"
> +#endif
>        Name(_HID, EISAID("PNP0A08")) // Indicates PCI Express/PCI-X Mode2 host hierarchy
>        Name(_CID, EISAID("PNP0A03")) // To support legacy OS that doesn't understand the new HID
>        Name(_SEG, 0)
> diff --git a/Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.inf 
> b/Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.inf
> index 3437bc489c..b3b45039cc 100644
> --- a/Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.inf
> +++ b/Platform/Intel/MinPlatformPkg/Acpi/MinDsdt/MinDsdt.inf
> @@ -40,6 +40,7 @@
>  [Pcd]
>    gMinPlatformPkgTokenSpaceGuid.PcdPciReservedMemBase
>    gMinPlatformPkgTokenSpaceGuid.PcdPciReservedMemLimit
> +  gMinPlatformPkgTokenSpaceGuid.PcdMinPciBridgePC00
>
>  [Depex]
>    gEfiAcpiTableProtocolGuid           AND
> diff --git a/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec 
> b/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
> index e6f714b181..68a76db4de 100644
> --- a/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
> +++ b/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
> @@ -139,6 +139,9 @@
>    gMinPlatformPkgTokenSpaceGuid.PcdAcpiXGpe1BlkRegisterBitWidth|0x00|UINT8|0x00010056
>    
> gMinPlatformPkgTokenSpaceGuid.PcdAcpiS4BiosReq|0x0000|UINT8|0x00010055
>
> +  # The PCD controls MinDsdt PciBridge
> +  
> + gMinPlatformPkgTokenSpaceGuid.PcdMinPciBridgePC00|FALSE|BOOLEAN|0x00
> + 010057
> +
>    #
>    # FADT Duty Offset - The zero-based index of where the processor's duty cycle
>    # setting is within the processor's P_CNT register.
> --
> 2.26.2.windows.1
>
>
>
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