[edk2-devel] [PATCH edk2-platforms v6 0/4] Provide XHCI USB controller only for newer hardware

[edk2-devel] [PATCH edk2-platforms v6 0/4] Provide XHCI USB controller only for newer hardware

[Marcin Juszkiewicz]

Platform version 0.3 introduced XHCI USB controller instead of EHCI one.
But we did it in a way that there is no in-EDK2 check for platform
version (XHCI is always given).

This behaviour works with Linux as it complains about being unable to
initialize EHCI and goes on. Free/Net/Open BSD systems hang in such
situation.

Now we check are we on Platform Version 0.3 at least and then initialize
XHCI controller. Otherwise we disable it's node in DSDT table.

I checked several ways to handle the situation. 

SSDT overlay enabling with LocateAndInstallAcpiFromFvConfitional() was
first one but this function had only DBG2 and FACP tables.

Then looked at trying to detect XHCI from _STA method. But this is
sysbus device which is there or not without way to discover it.

Next attempt was to have variable in DSDT and to use it in _STA. Too
much trouble.

Then looked again at code from
Ampere/JadePkg/Drivers/AcpiPlatformDxe/AcpiDsdt.c and noticed
UpdateStatusMethodObject() function. Copied some code and it worked.

Booting OpenBSD reminded me to update table checksum.

Nhi Pham pointed me to AcpiLib/AcpiAmlObjectUpdateInteger() function. So
v3 got AML variable (called XHCI) which is set to 0xF (enabled, working)
by default or to 0x0 (disabled, ignore) on Platform Version below 0.3
one.

This allowed to remove copy of UpdateStatusMethodObject() function.

---
Changes in v6:
- made DisableXhciOnOlderPlatVer() static
- added usual "if EFI_ERROR(Status)" dance

Changes in v5:
- added missing s-o-b lines
- run uncrustify on changed code
- fixed typos
- added comments

Changes in v4:
- make use of DisableXhciOnOlderPlatVer() return value

Changes in v3:
- use AML variable in DSDT

Changes in v2:
- XHCI initialized only on PlatVer 0.3+
- XHCI disabled in DSDT for older platforms
- no SSDT overlays for EHCI/XHCI
- no EHCI at all (it does not work anyway)
- no Pcd renaming

---
Marcin Juszkiewicz (4):
      SbsaQemu: introduce macro to compare platform version
      SbsaQemu: add AcpiLib
      SbsaQemu: initialize XHCI only if it exists
      SbsaQemu: disable XHCI in DSDT if not present

 Platform/Qemu/SbsaQemu/SbsaQemu.dsc                  |  2 +
 .../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf      |  4 ++
 .../IndustryStandard/SbsaQemuPlatformVersion.h       | 25 +++++++
 .../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c        | 74 +++++++++++++++++++-
 .../SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c        | 49 +++++++------
 Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl            |  3 +-
 6 files changed, 133 insertions(+), 24 deletions(-)
---
base-commit: 74b9eacfd453c56b8bcc5ac68b3bf5ca243d60a9
change-id: 20231013-ehci-xhci-fix-c529356a7a8f

Best regards,
-- 
Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>



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[edk2-devel] [PATCH edk2-platforms v6 1/4] SbsaQemu: introduce macro to compare platform version

[Marcin Juszkiewicz]

We want to check "if platver < 0.3" in an easy way.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 .../IndustryStandard/SbsaQemuPlatformVersion.h       | 25 ++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuPlatformVersion.h b/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuPlatformVersion.h
new file mode 100644
index 000000000000..dd2483787002
--- /dev/null
+++ b/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuPlatformVersion.h
@@ -0,0 +1,25 @@
+/** @file
+*
+*  Copyright (c) Linaro Limited. All rights reserved.
+*
+*  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef SBSAQEMUPLATFORM_VERSION_H
+#define SBSAQEMUPLATFORM_VERSION_H
+
+/*
+ * Compare PlatformVersion
+ *
+ */
+
+#define PLATFORM_VERSION_LESS_THAN(Major, Minor) (     \
+  (                                                    \
+    ( PcdGet32 (PcdPlatformVersionMajor) < Major)   || \
+    (                                                  \
+      ( PcdGet32 (PcdPlatformVersionMajor) == Major) && \
+      ( PcdGet32 (PcdPlatformVersionMinor) < Minor)    \
+    )                                                  \
+  )                                                    \
+)
+#endif

-- 
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[edk2-devel] [PATCH edk2-platforms v6 2/4] SbsaQemu: add AcpiLib

[Marcin Juszkiewicz]

It will be needed for playing with disabling XHCI later.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 Platform/Qemu/SbsaQemu/SbsaQemu.dsc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Platform/Qemu/SbsaQemu/SbsaQemu.dsc b/Platform/Qemu/SbsaQemu/SbsaQemu.dsc
index 806651fc55a0..fa85bd8dab89 100644
--- a/Platform/Qemu/SbsaQemu/SbsaQemu.dsc
+++ b/Platform/Qemu/SbsaQemu/SbsaQemu.dsc
@@ -172,6 +172,8 @@ [LibraryClasses.common]
 
   ReportStatusCodeLib|MdePkg/Library/BaseReportStatusCodeLibNull/BaseReportStatusCodeLibNull.inf
 
+  AcpiLib|EmbeddedPkg/Library/AcpiLib/AcpiLib.inf
+
   ArmLib|ArmPkg/Library/ArmLib/ArmBaseLib.inf
   ArmMmuLib|ArmPkg/Library/ArmMmuLib/ArmMmuBaseLib.inf
 

-- 
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[edk2-devel] [PATCH edk2-platforms v6 3/4] SbsaQemu: initialize XHCI only if it exists

[Marcin Juszkiewicz]

We need platform version to be at least 0.3 to have XHCI
in virtual hardware. On older platforms there is non-working
EHCI which we ignore.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 .../SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c        | 49 +++++++++++---------
 1 file changed, 27 insertions(+), 22 deletions(-)

diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c
index 36ada4270bbf..4ebbe7c93a19 100644
--- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c
+++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c
@@ -15,6 +15,7 @@
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/UefiDriverEntryPoint.h>
 #include <IndustryStandard/SbsaQemuSmc.h>
+#include <IndustryStandard/SbsaQemuPlatformVersion.h>
 
 #include <Protocol/FdtClient.h>
 
@@ -57,28 +58,6 @@ InitializeSbsaQemuPlatformDxe (
     return Status;
   }
 
-  Base = (VOID*)(UINTN)PcdGet64 (PcdPlatformXhciBase);
-  ASSERT (Base != NULL);
-  Size = (UINTN)PcdGet32 (PcdPlatformXhciSize);
-  ASSERT (Size != 0);
-
-  DEBUG ((DEBUG_INFO, "%a: Got platform XHCI %llx %u\n",
-          __FUNCTION__, Base, Size));
-
-  Status = RegisterNonDiscoverableMmioDevice (
-                   NonDiscoverableDeviceTypeXhci,
-                   NonDiscoverableDeviceDmaTypeCoherent,
-                   NULL,
-                   NULL,
-                   1,
-                   Base, Size);
-
-  if (EFI_ERROR(Status)) {
-    DEBUG ((DEBUG_ERROR, "%a: NonDiscoverable: Cannot install XHCI device @%p (Staus == %r)\n",
-            __FUNCTION__, Base, Status));
-    return Status;
-  }
-
   SmcResult = ArmCallSmc0 (SIP_SVC_VERSION, &Arg0, &Arg1, NULL);
   if (SmcResult == SMC_ARCH_CALL_SUCCESS) {
     Result = PcdSet32S (PcdPlatformVersionMajor, Arg0);
@@ -118,5 +97,31 @@ InitializeSbsaQemuPlatformDxe (
 
   DEBUG ((DEBUG_INFO, "GICI base: 0x%x\n", Arg0));
 
+  if (!PLATFORM_VERSION_LESS_THAN (0, 3)) {
+    Base = (VOID *)(UINTN)PcdGet64 (PcdPlatformXhciBase);
+    ASSERT (Base != NULL);
+    Size = (UINTN)PcdGet32 (PcdPlatformXhciSize);
+    ASSERT (Size != 0);
+
+    DEBUG ((DEBUG_INFO, "%a: Got platform XHCI %llx %u\n",
+            __FUNCTION__, Base, Size));
+
+    Status = RegisterNonDiscoverableMmioDevice (
+                                                NonDiscoverableDeviceTypeXhci,
+                                                NonDiscoverableDeviceDmaTypeCoherent,
+                                                NULL,
+                                                NULL,
+                                                1,
+                                                Base,
+                                                Size
+                                                );
+
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a: NonDiscoverable: Cannot install XHCI device @%p (Status == %r)\n",
+              __FUNCTION__, Base, Status));
+      return Status;
+    }
+  }
+
   return EFI_SUCCESS;
 }

-- 
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[edk2-devel] [PATCH edk2-platforms v6 4/4] SbsaQemu: disable XHCI in DSDT if not present

[Marcin Juszkiewicz]

We need platform version to be at least 0.3 to have XHCI
in virtual hardware. On older platforms there is non-working
EHCI which we ignore.

Set DSDT node to be disabled so operating system will not try
to initialize not-existing hardware.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 .../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf      |  4 ++
 .../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c        | 74 +++++++++++++++++++-
 Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl            |  3 +-
 3 files changed, 79 insertions(+), 2 deletions(-)

diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
index 7c7e08e0fd3a..291743b19115 100644
--- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
+++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
@@ -29,6 +29,7 @@ [Packages]
   Silicon/Qemu/SbsaQemu/SbsaQemu.dec
 
 [LibraryClasses]
+  AcpiLib
   ArmLib
   BaseMemoryLib
   BaseLib
@@ -49,6 +50,8 @@ [Pcd]
   gArmTokenSpaceGuid.PcdGicDistributorBase
   gArmTokenSpaceGuid.PcdGicRedistributorsBase
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdGicItsBase
+  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformVersionMajor
+  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformVersionMinor
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdSmmuBase
 
 [Depex]
@@ -58,6 +61,7 @@ [Guids]
   gEdkiiPlatformHasAcpiGuid
 
 [Protocols]
+  gEfiAcpiSdtProtocolGuid
   gEfiAcpiTableProtocolGuid                       ## CONSUMES
 
 [FixedPcd]
diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
index fd849ca1594b..523d9035e0c1 100644
--- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
+++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
@@ -10,6 +10,7 @@
 #include <IndustryStandard/AcpiAml.h>
 #include <IndustryStandard/IoRemappingTable.h>
 #include <IndustryStandard/SbsaQemuAcpi.h>
+#include <IndustryStandard/SbsaQemuPlatformVersion.h>
 #include <Library/AcpiLib.h>
 #include <Library/ArmLib.h>
 #include <Library/BaseMemoryLib.h>
@@ -682,6 +683,72 @@ AddGtdtTable (
   return Status;
 }
 
+/*
+ * A function to disable XHCI node on Platform Version lower than 0.3
+ */
+STATIC
+EFI_STATUS
+DisableXhciOnOlderPlatVer (
+  VOID
+  )
+{
+  EFI_STATUS                   Status;
+  EFI_ACPI_SDT_PROTOCOL        *AcpiSdtProtocol;
+  EFI_ACPI_DESCRIPTION_HEADER  *Table;
+  UINTN                        TableKey;
+  UINTN                        TableIndex;
+  EFI_ACPI_HANDLE              TableHandle;
+
+  Status = EFI_SUCCESS;
+
+  if ( PLATFORM_VERSION_LESS_THAN (0, 3)) {
+    DEBUG ((DEBUG_ERROR, "Platform Version < 0.3 - disabling XHCI\n"));
+    Status = gBS->LocateProtocol (
+                                  &gEfiAcpiSdtProtocolGuid,
+                                  NULL,
+                                  (VOID **)&AcpiSdtProtocol
+                                  );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "Unable to locate ACPI table protocol\n"));
+      return Status;
+    }
+
+    Status = AcpiLocateTableBySignature (
+                                         AcpiSdtProtocol,
+                                         EFI_ACPI_6_3_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE,
+                                         &TableIndex,
+                                         &Table,
+                                         &TableKey
+                                         );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "ACPI DSDT table not found!\n"));
+      ASSERT_EFI_ERROR (Status);
+      return Status;
+    }
+
+    Status = AcpiSdtProtocol->OpenSdt (TableKey, &TableHandle);
+    if (EFI_ERROR (Status)) {
+      ASSERT_EFI_ERROR (Status);
+      AcpiSdtProtocol->Close (TableHandle);
+      return Status;
+    }
+
+    Status = AcpiAmlObjectUpdateInteger (AcpiSdtProtocol, TableHandle, "\\_SB.USB0.XHCI", 0x0);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "Failed to disable XHCI!\n"));
+      ASSERT_EFI_ERROR (Status);
+      AcpiSdtProtocol->Close (TableHandle);
+      return Status;
+    }
+
+    AcpiSdtProtocol->Close (TableHandle);
+    AcpiUpdateChecksum ((UINT8 *)Table, Table->Length);
+  }
+
+  return Status;
+}
+
+
 EFI_STATUS
 EFIAPI
 InitializeSbsaQemuAcpiDxe (
@@ -738,5 +805,10 @@ InitializeSbsaQemuAcpiDxe (
     DEBUG ((DEBUG_ERROR, "Failed to add GTDT table\n"));
   }
 
-  return EFI_SUCCESS;
+  Status = DisableXhciOnOlderPlatVer ();
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "Failed to handle XHCI enablement\n"));
+  }
+
+  return Status;
 }
diff --git a/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl b/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
index 6661bc8195ee..b55ad6c5cc07 100644
--- a/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
+++ b/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
@@ -73,8 +73,9 @@ DefinitionBlock ("DsdtTable.aml", "DSDT",
         Name (_HID, "PNP0D10")      // _HID: Hardware ID
         Name (_UID, 0x00)            // _UID: Unique ID
         Name (_CCA, 0x01)            // _CCA: Cache Coherency Attribute
+        Name (XHCI, 0xF)            // will be set using AcpiLib
         Method (_STA) {
-          Return (0xF)
+          Return (XHCI)
         }
         Method (_CRS, 0x0, Serialized) {
             Name (RBUF, ResourceTemplate() {

-- 
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Re: [edk2-devel] [PATCH edk2-platforms v6 4/4] SbsaQemu: disable XHCI in DSDT if not present

[Leif Lindholm]

On Thu, Oct 26, 2023 at 19:33:52 +0200, Marcin Juszkiewicz wrote:
> We need platform version to be at least 0.3 to have XHCI
> in virtual hardware. On older platforms there is non-working
> EHCI which we ignore.
> 
> Set DSDT node to be disabled so operating system will not try
> to initialize not-existing hardware.
> 
> Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
> ---
>  .../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf      |  4 ++
>  .../Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c        | 74 +++++++++++++++++++-
>  Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl            |  3 +-
>  3 files changed, 79 insertions(+), 2 deletions(-)
> 
> diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
> index 7c7e08e0fd3a..291743b19115 100644
> --- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
> +++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.inf
> @@ -29,6 +29,7 @@ [Packages]
>    Silicon/Qemu/SbsaQemu/SbsaQemu.dec
>  
>  [LibraryClasses]
> +  AcpiLib
>    ArmLib
>    BaseMemoryLib
>    BaseLib
> @@ -49,6 +50,8 @@ [Pcd]
>    gArmTokenSpaceGuid.PcdGicDistributorBase
>    gArmTokenSpaceGuid.PcdGicRedistributorsBase
>    gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdGicItsBase
> +  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformVersionMajor
> +  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformVersionMinor
>    gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdSmmuBase
>  
>  [Depex]
> @@ -58,6 +61,7 @@ [Guids]
>    gEdkiiPlatformHasAcpiGuid
>  
>  [Protocols]
> +  gEfiAcpiSdtProtocolGuid
>    gEfiAcpiTableProtocolGuid                       ## CONSUMES
>  
>  [FixedPcd]
> diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
> index fd849ca1594b..523d9035e0c1 100644
> --- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
> +++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuAcpiDxe/SbsaQemuAcpiDxe.c
> @@ -10,6 +10,7 @@
>  #include <IndustryStandard/AcpiAml.h>
>  #include <IndustryStandard/IoRemappingTable.h>
>  #include <IndustryStandard/SbsaQemuAcpi.h>
> +#include <IndustryStandard/SbsaQemuPlatformVersion.h>
>  #include <Library/AcpiLib.h>
>  #include <Library/ArmLib.h>
>  #include <Library/BaseMemoryLib.h>
> @@ -682,6 +683,72 @@ AddGtdtTable (
>    return Status;
>  }
>  
> +/*
> + * A function to disable XHCI node on Platform Version lower than 0.3
> + */
> +STATIC
> +EFI_STATUS
> +DisableXhciOnOlderPlatVer (
> +  VOID
> +  )
> +{
> +  EFI_STATUS                   Status;
> +  EFI_ACPI_SDT_PROTOCOL        *AcpiSdtProtocol;
> +  EFI_ACPI_DESCRIPTION_HEADER  *Table;
> +  UINTN                        TableKey;
> +  UINTN                        TableIndex;
> +  EFI_ACPI_HANDLE              TableHandle;
> +
> +  Status = EFI_SUCCESS;
> +
> +  if ( PLATFORM_VERSION_LESS_THAN (0, 3)) {
> +    DEBUG ((DEBUG_ERROR, "Platform Version < 0.3 - disabling XHCI\n"));
> +    Status = gBS->LocateProtocol (
> +                                  &gEfiAcpiSdtProtocolGuid,
> +                                  NULL,
> +                                  (VOID **)&AcpiSdtProtocol
> +                                  );
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "Unable to locate ACPI table protocol\n"));
> +      return Status;
> +    }
> +
> +    Status = AcpiLocateTableBySignature (
> +                                         AcpiSdtProtocol,
> +                                         EFI_ACPI_6_3_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE,
> +                                         &TableIndex,
> +                                         &Table,
> +                                         &TableKey
> +                                         );
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "ACPI DSDT table not found!\n"));
> +      ASSERT_EFI_ERROR (Status);
> +      return Status;
> +    }
> +
> +    Status = AcpiSdtProtocol->OpenSdt (TableKey, &TableHandle);
> +    if (EFI_ERROR (Status)) {
> +      ASSERT_EFI_ERROR (Status);
> +      AcpiSdtProtocol->Close (TableHandle);
> +      return Status;
> +    }
> +
> +    Status = AcpiAmlObjectUpdateInteger (AcpiSdtProtocol, TableHandle, "\\_SB.USB0.XHCI", 0x0);
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "Failed to disable XHCI!\n"));
> +      ASSERT_EFI_ERROR (Status);
> +      AcpiSdtProtocol->Close (TableHandle);
> +      return Status;
> +    }
> +
> +    AcpiSdtProtocol->Close (TableHandle);
> +    AcpiUpdateChecksum ((UINT8 *)Table, Table->Length);
> +  }
> +
> +  return Status;
> +}
> +
> +
>  EFI_STATUS
>  EFIAPI
>  InitializeSbsaQemuAcpiDxe (
> @@ -738,5 +805,10 @@ InitializeSbsaQemuAcpiDxe (
>      DEBUG ((DEBUG_ERROR, "Failed to add GTDT table\n"));
>    }
>  
> -  return EFI_SUCCESS;
> +  Status = DisableXhciOnOlderPlatVer ();
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_ERROR, "Failed to handle XHCI enablement\n"));
> +  }
> +
> +  return Status;

Right, this isn't what I asked for though.
There is nothing valid about returning a bad status here - it is the
entry point of the module. If we wanted some sort of error handling,
we would need to plumb that in manually.

Anyway, no point in you spinning another version, I'll change this
back to the original return statement.

For the series:
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>
Pushed as 74b9eacfd453..d61836283a4c.

Thanks!


>  }
> diff --git a/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl b/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
> index 6661bc8195ee..b55ad6c5cc07 100644
> --- a/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
> +++ b/Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl
> @@ -73,8 +73,9 @@ DefinitionBlock ("DsdtTable.aml", "DSDT",
>          Name (_HID, "PNP0D10")      // _HID: Hardware ID
>          Name (_UID, 0x00)            // _UID: Unique ID
>          Name (_CCA, 0x01)            // _CCA: Cache Coherency Attribute
> +        Name (XHCI, 0xF)            // will be set using AcpiLib
>          Method (_STA) {
> -          Return (0xF)
> +          Return (XHCI)
>          }
>          Method (_CRS, 0x0, Serialized) {
>              Name (RBUF, ResourceTemplate() {
> 
> -- 
> 2.41.0
> 


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