diff options
| author | Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com> | 2017-12-14 16:09:57 +0000 |
|---|---|---|
| committer | Wei Xu <xuwei5@hisilicon.com> | 2018-03-02 16:19:41 +0000 |
| commit | 17f21343d7a0affc77b6cc1433cffa503433bbe6 (patch) | |
| tree | 23f0167142a89311a05cc5da8807b17bf1837ce5 /arch/arm64/boot/dts/hisilicon/hip07.dtsi | |
| parent | 45cc842d5b75ba8f9a958f2dd12b95c6dd0452bd (diff) | |
arm64: dts: hisi: Disable hisilicon smmu node on hip06/hip07
The HiSilicon erratum 161010801 describes the limitation of
HiSilicon platforms hip06/hip07 to support the SMMUv3 mappings
for MSI transactions.
PCIe controller on these platforms has to differentiate the
MSI payload against other DMA payload and has to modify the
MSI payload. This makes it difficult for these platforms to
have SMMU translation for MSI. In order to workaround this,
ARM SMMUv3 driver requires a quirk to treat the MSI regions
separately. Such a quirk is currently missing for DT based
systems and therefore we need to explicitly disable the
hip06/hip07 smmu entries in dts.
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
Diffstat (limited to 'arch/arm64/boot/dts/hisilicon/hip07.dtsi')
| -rw-r--r-- | arch/arm64/boot/dts/hisilicon/hip07.dtsi | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/hisilicon/hip07.dtsi b/arch/arm64/boot/dts/hisilicon/hip07.dtsi index 4bd6416122d5..0600a6a84ab7 100644 --- a/arch/arm64/boot/dts/hisilicon/hip07.dtsi +++ b/arch/arm64/boot/dts/hisilicon/hip07.dtsi @@ -1083,6 +1083,31 @@ }; }; + /** + * HiSilicon erratum 161010801: This describes the limitation + * of HiSilicon platforms hip06/hip07 to support the SMMUv3 + * mappings for PCIe MSI transactions. + * PCIe controller on these platforms has to differentiate the + * MSI payload against other DMA payload and has to modify the + * MSI payload. This makes it difficult for these platforms to + * have a SMMU translation for MSI. In order to workaround this, + * ARM SMMUv3 driver requires a quirk to treat the MSI regions + * separately. Such a quirk is currently missing for DT based + * systems. Hence please make sure that the smmu pcie node on + * hip07 is disabled as this will break the PCIe functionality + * when iommu-map entry is used along with the PCIe node. + * Refer:https://www.spinics.net/lists/arm-kernel/msg602812.html + */ + smmu0: smmu_pcie { + compatible = "arm,smmu-v3"; + reg = <0x0 0xa0040000 0x0 0x20000>; + #iommu-cells = <1>; + dma-coherent; + smmu-cb-memtype = <0x0 0x1>; + hisilicon,broken-prefetch-cmd; + status = "disabled"; + }; + soc { compatible = "simple-bus"; #address-cells = <2>; |