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DynamicTablesPkg: Add an override for 16550 HID in SSDT

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Some platforms advertise support for a 16550 UART, but are not
compatible with the PNP0500 HID. Allow them to override the HID by
setting PcdNonBsaCompliant16550SerialHid.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
This commit is contained in:
Joey Gouly
2021-01-22 12:51:12 +00:00
committed by mergify[bot]
parent 7766ebd5ad
commit 42c0019f27
3 changed files with 17 additions and 4 deletions
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14
DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.c
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@@ -1,7 +1,7 @@
/** @file
SSDT Serial Port Fixup Library.
Copyright (c) 2019 - 2020, Arm Limited. All rights reserved.<BR>
Copyright (c) 2019 - 2021, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -139,13 +139,21 @@ FixupIds (
AML_OBJECT_NODE_HANDLE NameOpIdNode;
CONST CHAR8 * HidString;
CONST CHAR8 * CidString;
CONST CHAR8 * NonBsaHid;
// Get the _CID and _HID value to write.
switch (SerialPortInfo->PortSubtype) {
case EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_FULL_16550:
{
HidString = "PNP0501";
CidString = "PNP0500";
// If there is a non-BSA compliant HID, use that.
NonBsaHid = (CONST CHAR8*)PcdGetPtr (PcdNonBsaCompliant16550SerialHid);
if ((NonBsaHid != NULL) && (AsciiStrLen (NonBsaHid) != 0)) {
HidString = NonBsaHid;
CidString = "";
} else {
HidString = "PNP0501";
CidString = "PNP0500";
}
break;
}
case EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_ARM_PL011_UART: