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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jan 2021 18:27:47.8521 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ba050efa-c000-40f6-19df-08d8bd711674 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT045.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB7PR08MB4588 Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable > -----Original Message----- > From: Joey Gouly > Sent: Wednesday, January 20, 2021 1:20 PM > To: devel@edk2.groups.io > Cc: Joey Gouly ; ardb+tianocore@kernel.org; Sami > Mujawar ; Jeff Brasen (jbrasen@nvidia.com) > ; ipark@nvidia.com; Samer El-Haj-Mahmoud > ; nd > Subject: [PATCH v1 2/2] DynamicTablesPkg: Add an override for 16550 HID i= n > SSDT >=20 > Some platforms advertise support for a 16550 UART, but are not compatible > with the PNP0500 HID. Allow them to override the HID by setting > PcdNonSbsaCompliantSerialHid. >=20 > Signed-off-by: Joey Gouly > --- > DynamicTablesPkg/DynamicTablesPkg.dec = | 3 +++ >=20 > DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFix > upLib.inf | 4 +++- >=20 > DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFix > upLib.c | 14 +++++++++++--- > 3 files changed, 17 insertions(+), 4 deletions(-) >=20 > diff --git a/DynamicTablesPkg/DynamicTablesPkg.dec > b/DynamicTablesPkg/DynamicTablesPkg.dec > index > 291a45a69679ae82219ecd2f26dfabfbab1f7f65..3ec4fff116a8f538be331edf34 > 1867948c025116 100644 > --- a/DynamicTablesPkg/DynamicTablesPkg.dec > +++ b/DynamicTablesPkg/DynamicTablesPkg.dec > @@ -44,5 +44,8 @@ [PcdsFixedAtBuild] > # Maximum number of Custom DT Generators >=20 > gEdkiiDynamicTablesPkgTokenSpaceGuid.PcdMaxCustomDTGenerators|1|UI > NT16|0xC0000003 >=20 > + # Non SBSA Compliant Serial HID > + > + > gEdkiiDynamicTablesPkgTokenSpaceGuid.PcdNonSbsaCompliantSerialHid|""| > V > + OID*|0x40000008 > + > [Guids] > gEdkiiDynamicTablesPkgTokenSpaceGuid =3D { 0xab226e66, 0x31d8, 0x4613,= { > 0x87, 0x9d, 0xd2, 0xfa, 0xb6, 0x10, 0x26, 0x3c } } diff --git > a/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPort > FixupLib.inf > b/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPort > FixupLib.inf > index > af3d404393f5f1385ab2d40f45f7222ab66f9b3a..b64825982e8fb7aaf78f3fd68 > 992e1c78d20c408 100644 > --- > a/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPort > FixupLib.inf > +++ > b/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialP > +++ ortFixupLib.inf > @@ -1,7 +1,7 @@ > ## @file > # SSDT Serial Port fixup Library > # > -# Copyright (c) 2020, Arm Limited. All rights reserved.
> +# Copyright (c) 2020 - 2021, Arm Limited. All rights reserved.
> # > # SPDX-License-Identifier: BSD-2-Clause-Patent ## @@ -28,3 +28,5 @@ > [LibraryClasses] > AmlLib > BaseLib >=20 > +[Pcd] > + gEdkiiDynamicTablesPkgTokenSpaceGuid.PcdNonSbsaCompliantSerialHid > diff --git > a/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPort > FixupLib.c > b/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPort > FixupLib.c > index > 0ff071485ef25f4ca63de0eeab5120d1beece4db..73a8087ed8a8ff84b64531a3c > 73d319585dfb6cf 100644 > --- > a/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPort > FixupLib.c > +++ > b/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialP > +++ ortFixupLib.c > @@ -1,7 +1,7 @@ > /** @file > SSDT Serial Port Fixup Library. >=20 > - Copyright (c) 2019 - 2020, Arm Limited. All rights reserved.
> + Copyright (c) 2019 - 2021, Arm Limited. All rights reserved.
>=20 > SPDX-License-Identifier: BSD-2-Clause-Patent >=20 > @@ -139,13 +139,21 @@ FixupIds ( > AML_OBJECT_NODE_HANDLE NameOpIdNode; > CONST CHAR8 * HidString; > CONST CHAR8 * CidString; > + CONST CHAR8 * NonSbsaHid; >=20 > // Get the _CID and _HID value to write. > switch (SerialPortInfo->PortSubtype) { > case EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_FULL_16550: > { > - HidString =3D "PNP0501"; > - CidString =3D "PNP0500"; > + // If there is a non-SBSA compliant HID, use that. > + NonSbsaHid =3D (CONST CHAR8*)PcdGetPtr > (PcdNonSbsaCompliantSerialHid); > + if ((NonSbsaHid !=3D NULL) && (AsciiStrLen (NonSbsaHid) !=3D 0)) { > + HidString =3D NonSbsaHid; > + CidString =3D ""; > + } else { > + HidString =3D "PNP0501"; > + CidString =3D "PNP0500"; > + } > break; > } > case EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_ARM_PL011_UART: > -- Since you are using PcdNonSbsaCompliantSerialHid to indicate that this is a= non-BSA compliant 16550 UART, maybe rename the PCD to reflect that? The na= me PcdNonSbsaCompliantSerialHid may imply that this is not a PL011/ Arm SBS= A Generic UART. BSA 1.0 allows both PL011/Generic UART (the definition move= d from SBSA spec to the BSA spec) OR a 16550 standard UART. In this case, = we are saying the UART is a 16550-like UART, but not exactly standard (i.e.= do not use the standard 16550 IDs) Maybe PcdNon16550CompliantSerialHid or PcdNonBsa16550CompliantSerialHid is= a better name that matches what the code is doing? The comments will need to change as well.