Re: [PATCH v3 7/7] Platform/RaspberryPi: Add Linux quirk support

["Samer El-Haj-Mahmoud" <samer.el-haj-mahmoud@arm.com>]

Reviewed-By: Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>

> -----Original Message-----
> From: Jeremy Linton <jeremy.linton@arm.com>
> Sent: Friday, August 20, 2021 12:16 AM
> To: devel@edk2.groups.io
> Cc: pete@akeo.ie; ardb+tianocore@kernel.org; Andrei Warkentin
> (awarkentin@vmware.com) <awarkentin@vmware.com>; Sunny Wang
> <Sunny.Wang@arm.com>; Samer El-Haj-Mahmoud <Samer.El-Haj-
> Mahmoud@arm.com>; Jeremy Linton <Jeremy.Linton@arm.com>
> Subject: [PATCH v3 7/7] Platform/RaspberryPi: Add Linux quirk support
>
> Linux, for the time being has refused to support the Arm
> standard SMCCC for PCIe configuration. Instead they
> want to continue to maintain per device "quirks".
>
> As the RPI isn't really ECAM this is a bit more
> involved because the MCFG can't really describe
> the root port+config registers situation. Further
> platforms which support the SMCCC shouldn't have
> a MCFG, so we need an additional way to tell linux
> what it needs to know about this platform.
>
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
> ---
>  Platform/RaspberryPi/AcpiTables/Pci.asl | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/Platform/RaspberryPi/AcpiTables/Pci.asl
> b/Platform/RaspberryPi/AcpiTables/Pci.asl
> index dc2bd7bc9e..50fe2cbdf2 100644
> --- a/Platform/RaspberryPi/AcpiTables/Pci.asl
> +++ b/Platform/RaspberryPi/AcpiTables/Pci.asl
> @@ -62,6 +62,13 @@ DefinitionBlock (__FILE__, "SSDT", 5, "RPIFDN",
> "RPI4PCIE", 2)
>          Package (4) { 0x0000FFFF, 3, zero, 178 }
>        })
>
> +      Name (_DSD, Package () {
> +        ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> +          Package () {
> +            Package () { "linux-ecam-quirk-id", "bcm2711" },
> +          }
> +      })
> +
>        // Root complex resources
>        Method (_CRS, 0, Serialized) {
>          Name (RBUF, ResourceTemplate () {
> --
> 2.13.7

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