linux-kernel - [RFT PATCH] arm64: dts: sdm845: Add iommus property to qup

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Date:   Tue, 20 Oct 2020 08:03:01 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFT PATCH] arm64: dts: sdm845: Add iommus property to qup

From: Stephen Boyd <swboyd@...omium.org>

The SMMU that sits in front of the QUP needs to be programmed properly
so that the i2c geni driver can allocate DMA descriptors. Failure to do
this leads to faults when using devices such as an i2c touchscreen where
the transaction is larger than 32 bytes and we use a DMA buffer.

arm-smmu 15000000.iommu: Unexpected global fault, this could be serious
arm-smmu 15000000.iommu:         GFSR 0x00000002, GFSYNR0 0x00000002, GFSYNR1 0x000006c0, GFSYNR2 0x00000000

Add the right SID and mask so this works.

Signed-off-by: Stephen Boyd <swboyd@...omium.org>
[bjorn: Define for second QUP as well]
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 arch/arm64/boot/dts/qcom/sdm845.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 8eb5a31346d2..7d635bc919cb 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -811,6 +811,7 @@ qupv3_id_0: geniqup@...000 {
 			clock-names = "m-ahb", "s-ahb";
 			clocks = <&gcc GCC_QUPV3_WRAP_0_M_AHB_CLK>,
 				 <&gcc GCC_QUPV3_WRAP_0_S_AHB_CLK>;
+			iommus = <&apps_smmu 0x0 0x3>;
 			#address-cells = <2>;
 			#size-cells = <2>;
 			ranges;
@@ -1119,6 +1120,7 @@ qupv3_id_1: geniqup@...000 {
 			clock-names = "m-ahb", "s-ahb";
 			clocks = <&gcc GCC_QUPV3_WRAP_1_M_AHB_CLK>,
 				 <&gcc GCC_QUPV3_WRAP_1_S_AHB_CLK>;
+			iommus = <&apps_smmu 0x6c0 0x3>;
 			#address-cells = <2>;
 			#size-cells = <2>;
 			ranges;
-- 
2.28.0