Subject: [PATCH V2] arm64: dts: qcom: sc7280: Mark PCIe controller as cache coherent

If the controller is not marked as cache coherent, then kernel will
try to ensure coherency during dma-ops and that may cause data corruption.
So, mark the PCIe node as dma-coherent as the devices on PCIe bus are
cache coherent.

Cc: [email protected]
Fixes: 92e0ee9f83b3 ("arm64: dts: qcom: sc7280: Add PCIe and PHY related node")
Signed-off-by: Krishna chaitanya chundru <[email protected]>
---

changes since v1:
- Updated the commit text.
---
---
arch/arm64/boot/dts/qcom/sc7280.dtsi | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
index bdcb749..8f4ab6b 100644
--- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
@@ -2131,6 +2131,8 @@
pinctrl-names = "default";
pinctrl-0 = <&pcie1_clkreq_n>;

+ dma-coherent;
+
iommus = <&apps_smmu 0x1c80 0x1>;

iommu-map = <0x0 &apps_smmu 0x1c80 0x1>,
--
2.7.4



2023-03-07 04:17:46

by Bjorn Andersson

[permalink] [raw]
Subject: Re: [PATCH V2] arm64: dts: qcom: sc7280: Mark PCIe controller as cache coherent

On Tue, 28 Feb 2023 17:19:12 +0530, Krishna chaitanya chundru wrote:
> If the controller is not marked as cache coherent, then kernel will
> try to ensure coherency during dma-ops and that may cause data corruption.
> So, mark the PCIe node as dma-coherent as the devices on PCIe bus are
> cache coherent.
>
>

Applied, thanks!

[1/1] arm64: dts: qcom: sc7280: Mark PCIe controller as cache coherent
commit: 8a63441e83724fee1ef3fd37b237d40d90780766

Best regards,
--
Bjorn Andersson <[email protected]>