openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

arm64: dts: qcom: sdm845: Extend ranges and describe DMA space 

For devices attached to an IOMMU, translation between IOVA and physical
addresses is no longer 1:1 and dma-ranges should be specified to
describe the available IOVA address space.

On SDM845 the busses are implemented with 36 address bits, so dma-ranges
must be defined to reduce the size of the IOVA address space from the 48
bits supported by the SMMU. Without this DMA allocations may end up with
IOVAs outside the valid range, that gets truncated by the bus between
the device and its translation unit.

Also extend ranges to describe the available address space.

Tested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Bjorn Andersson 2019-01-16 20:29:40 -08:00 committed by Andy Gross
parent bede7d2dc8
commit 9feb667d86
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/boot/dts/qcom/sdm845.dtsi
View File

@ -354,7 +354,8 @@ psci {
soc: soc {
#address-cells = <2>;
#size-cells = <2>;
ranges = <0 0 0 0 0 0xffffffff>;
ranges = <0 0 0 0 0x10 0>;
dma-ranges = <0 0 0 0 0x10 0>;
compatible = "simple-bus";
gcc: clock-controller@100000 {