linux-kernel - [PATCH] arm64: dts: qcom: sc7280: Add static properties to cryptobam

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Message-Id: <20231229-sc7280-cryptobam-fixup-v1-1-bd8f68589b80@fairphone.com>
Date: Fri, 29 Dec 2023 09:51:37 +0100
From: Luca Weiss <luca.weiss@...rphone.com>
To: cros-qcom-dts-watchers@...omium.org, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Om Prakash Singh <quic_omprsing@...cinc.com>, 
 Stephan Gerhold <stephan.gerhold@...nkonzept.com>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH] arm64: dts: qcom: sc7280: Add static properties to
 cryptobam

When the properties num-channels & qcom,num-ees are not specified, the
driver tries to read the values from registers, but this read fails and
resets the device if the interconnect from the qcom,qce node is not
already active when that happens.

Add the static properties to not touch any registers during probe, the
rest of the time when the BAM is used by QCE then the interconnect will
be active already.

Fixes: d488f903a860 ("arm64: dts: qcom: sc7280: add QCrypto nodes")
Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
See also:
https://lore.kernel.org/linux-arm-msm/CY01EKQVWE36.B9X5TDXAREPF@fairphone.com/

Alternatively you could add interconnect property (copied from &crypto)
and add interconnect support to the BAM driver, then during probe we can
read the registers without crashing the device.
---
 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 83b5b76ba179..ce0d24ee7eed 100644
--- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
@@ -2345,6 +2345,8 @@ cryptobam: dma-controller@...4000 {
 				 <&apps_smmu 0x4e6 0x0011>;
 			qcom,ee = <0>;
 			qcom,controlled-remotely;
+			num-channels = <16>;
+			qcom,num-ees = <4>;
 		};
 
 		crypto: crypto@...a000 {

---
base-commit: 39676dfe52331dba909c617f213fdb21015c8d10
change-id: 20231229-sc7280-cryptobam-fixup-fb5f94a5572f

Best regards,
-- 
Luca Weiss <luca.weiss@...rphone.com>