Re: [PATCH 3/3] Platform/RaspberryPi/AcpiTables: Correct _DMA consumer

["Andrei Warkentin" <awarkentin@vmware.com>]

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I don't know... the ACPI spec is weird.

https://uefi.org/specs/ACPI/6.4/06_Device_Configuration/Device_Configuration.html#dma-direct-memory-access

...lists ResourceConsumer for _DMA.

A

________________________________
From: Jeremy Linton <jeremy.linton@arm.com>
Sent: Thursday, April 8, 2021 12:58 AM
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: ard.biesheuvel@arm.com <ard.biesheuvel@arm.com>; leif@nuviainc.com <leif@nuviainc.com>; pete@akeo.ie <pete@akeo.ie>; samer.el-haj-mahmoud@arm.com <samer.el-haj-mahmoud@arm.com>; Andrei Warkentin <awarkentin@vmware.com>; Jeremy Linton <jeremy.linton@arm.com>
Subject: [PATCH 3/3] Platform/RaspberryPi/AcpiTables: Correct _DMA consumer

Bridge devices should be marked as producers so that their
children can consume the resources. In linux if this isn't
true then the translation gets ignored and the DMA values
are incorrect. This fixes DMA on all the devices that
need a translation.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
 Platform/RaspberryPi/AcpiTables/Dsdt.asl | 2 +-
 Platform/RaspberryPi/AcpiTables/Emmc.asl | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Platform/RaspberryPi/AcpiTables/Dsdt.asl b/Platform/RaspberryPi/AcpiTables/Dsdt.asl
index d116f965e1..32cd5fc9f9 100644
--- a/Platform/RaspberryPi/AcpiTables/Dsdt.asl
+++ b/Platform/RaspberryPi/AcpiTables/Dsdt.asl
@@ -205,7 +205,7 @@ DefinitionBlock ("Dsdt.aml", "DSDT", 5, "RPIFDN", "RPI", 2)
         // Only the first GB is available.

         // Bus 0xC0000000 -> CPU 0x00000000.

         //

-        QWordMemory (ResourceConsumer,

+        QWordMemory (ResourceProducer,

           ,

           MinFixed,

           MaxFixed,

diff --git a/Platform/RaspberryPi/AcpiTables/Emmc.asl b/Platform/RaspberryPi/AcpiTables/Emmc.asl
index 179dd3ecdb..0fbc2a79ea 100644
--- a/Platform/RaspberryPi/AcpiTables/Emmc.asl
+++ b/Platform/RaspberryPi/AcpiTables/Emmc.asl
@@ -32,7 +32,7 @@ DefinitionBlock (__FILE__, "SSDT", 5, "RPIFDN", "RPI4EMMC", 2)
       }



       Name (_DMA, ResourceTemplate() {

-        QWordMemory (ResourceConsumer,

+        QWordMemory (ResourceProducer,

           ,

           MinFixed,

           MaxFixed,

--
2.13.7


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