Martin Roth has submitted this change and it was merged. ( https://review.coreboot.org/29342 )
Change subject: mb/google/kahlee: Disable IOMMU ......................................................................
mb/google/kahlee: Disable IOMMU
Unfortunately Stoney has an issue where enabling the IOMMU causes a 10%-50% decrease in the integrated graphics performance. It is also disabled by default on other stoney platforms.
BUG=b:118612241 TEST=Verify that IOMMU is disabled.
Change-Id: Ia396c7227cb21461ec8afbdf746721d4fb28083d Signed-off-by: Martin Roth martinroth@google.com Reviewed-on: https://review.coreboot.org/29342 Reviewed-by: Raul Rangel rrangel@chromium.org Reviewed-by: Daniel Kurtz djkurtz@google.com Tested-by: build bot (Jenkins) no-reply@coreboot.org --- M src/mainboard/google/kahlee/variants/aleena/devicetree.cb M src/mainboard/google/kahlee/variants/careena/devicetree.cb M src/mainboard/google/kahlee/variants/delan/devicetree.cb M src/mainboard/google/kahlee/variants/grunt/devicetree.cb M src/mainboard/google/kahlee/variants/liara/devicetree.cb 5 files changed, 5 insertions(+), 5 deletions(-)
Approvals: build bot (Jenkins): Verified Daniel Kurtz: Looks good to me, approved Raul Rangel: Looks good to me, approved
diff --git a/src/mainboard/google/kahlee/variants/aleena/devicetree.cb b/src/mainboard/google/kahlee/variants/aleena/devicetree.cb index 5438e6d..27a8e28 100644 --- a/src/mainboard/google/kahlee/variants/aleena/devicetree.cb +++ b/src/mainboard/google/kahlee/variants/aleena/devicetree.cb @@ -58,7 +58,7 @@ end device domain 0 on device pci 0.0 on end # Root Complex - device pci 0.2 on end # IOMMU + device pci 0.2 off end # IOMMU (Disabled for performance and battery) device pci 1.0 on end # Internal Graphics P2P bridge 0x98e4 device pci 1.1 on end # Internal Multimedia device pci 2.0 on end # PCIe Host Bridge diff --git a/src/mainboard/google/kahlee/variants/careena/devicetree.cb b/src/mainboard/google/kahlee/variants/careena/devicetree.cb index b541c03..23253b2 100644 --- a/src/mainboard/google/kahlee/variants/careena/devicetree.cb +++ b/src/mainboard/google/kahlee/variants/careena/devicetree.cb @@ -61,7 +61,7 @@ end device domain 0 on device pci 0.0 on end # Root Complex - device pci 0.2 on end # IOMMU + device pci 0.2 off end # IOMMU (Disabled for performance and battery) device pci 1.0 on end # Internal Graphics P2P bridge 0x98e4 device pci 1.1 on end # Internal Multimedia device pci 2.0 on end # PCIe Host Bridge diff --git a/src/mainboard/google/kahlee/variants/delan/devicetree.cb b/src/mainboard/google/kahlee/variants/delan/devicetree.cb index 0dfe204..fd30d5d 100644 --- a/src/mainboard/google/kahlee/variants/delan/devicetree.cb +++ b/src/mainboard/google/kahlee/variants/delan/devicetree.cb @@ -55,7 +55,7 @@ end device domain 0 on device pci 0.0 on end # Root Complex - device pci 0.2 on end # IOMMU + device pci 0.2 off end # IOMMU (Disabled for performance and battery) device pci 1.0 on end # Internal Graphics P2P bridge 0x98e4 device pci 1.1 on end # Internal Multimedia device pci 2.0 on end # PCIe Host Bridge diff --git a/src/mainboard/google/kahlee/variants/grunt/devicetree.cb b/src/mainboard/google/kahlee/variants/grunt/devicetree.cb index 5a8906b..b37e1bf 100644 --- a/src/mainboard/google/kahlee/variants/grunt/devicetree.cb +++ b/src/mainboard/google/kahlee/variants/grunt/devicetree.cb @@ -61,7 +61,7 @@ end device domain 0 on device pci 0.0 on end # Root Complex - device pci 0.2 on end # IOMMU + device pci 0.2 off end # IOMMU (Disabled for performance and battery) device pci 1.0 on end # Internal Graphics P2P bridge 0x98e4 device pci 1.1 on end # Internal Multimedia device pci 2.0 on end # PCIe Host Bridge diff --git a/src/mainboard/google/kahlee/variants/liara/devicetree.cb b/src/mainboard/google/kahlee/variants/liara/devicetree.cb index cea3425..343fbeb 100644 --- a/src/mainboard/google/kahlee/variants/liara/devicetree.cb +++ b/src/mainboard/google/kahlee/variants/liara/devicetree.cb @@ -58,7 +58,7 @@ end device domain 0 on device pci 0.0 on end # Root Complex - device pci 0.2 on end # IOMMU + device pci 0.2 off end # IOMMU device pci 1.0 on end # Internal Graphics P2P bridge 0x98e4 device pci 1.1 on end # Internal Multimedia device pci 2.0 on end # PCIe Host Bridge
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Martin Roth (Code Review)