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DynamicTablesPkg: Add an override for 16550 HID in SSDT 

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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3
DynamicTablesPkg/DynamicTablesPkg.dec
View File

@ -44,5 +44,8 @@
# Maximum number of Custom DT Generators
gEdkiiDynamicTablesPkgTokenSpaceGuid.PcdMaxCustomDTGenerators|1|UINT16|0xC0000003
# Non BSA Compliant 16550 Serial HID
gEdkiiDynamicTablesPkgTokenSpaceGuid.PcdNonBsaCompliant16550SerialHid|""|VOID*|0x40000008
[Guids]
gEdkiiDynamicTablesPkgTokenSpaceGuid = { 0xab226e66, 0x31d8, 0x4613, { 0x87, 0x9d, 0xd2, 0xfa, 0xb6, 0x10, 0x26, 0x3c } }

14
DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.c
View File

@ -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:

4
DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.inf
View File

@ -1,7 +1,7 @@
## @file
# SSDT Serial Port fixup Library
#
# Copyright (c) 2020, Arm Limited. All rights reserved.<BR>
# Copyright (c) 2020 - 2021, Arm Limited. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
##
@ -28,3 +28,5 @@
AmlLib
BaseLib
[Pcd]
gEdkiiDynamicTablesPkgTokenSpaceGuid.PcdNonBsaCompliant16550SerialHid