Hello, Some CM3.5 reports indicate that Hardware Cache Initialization is complete, but in reality it's not the case. They also incorrectly show that Hardware Cache Initialization is supported. Unfortunately, it is not possible to detect this issue at runtime and the information has to be passed by the device tree. I initially proposed to add this information as a CPU property, but as rightfully pointed out by Jiaxun, it should be more of a Coherence Manager property. A few months ago, Jiaxun proposed a series to pass the address of the CM through the device tree when it was not possible to get it at runtime. This series introduced the binding for the CM that I reused. However, there were some parts of this series that were commented on and needed to be addressed, and I don't have the hardware for it. Therefore, I've kept only the binding and relaxed the need for the reg property for the eyeq6 case. My initial proposal was integrated into the series set by Aleksandar here [1]. And the series adding the CM binding was here: [2]. The patches 1,2,3, and 5 have no dependencies while patch 4 should depend on this series [1]. Actually, those five patches should replace patches 10, 11, and 12. Gregory [1]: https://lore.kernel.org/all/20241028175935.51250-1-arikalo@xxxxxxxxx/ [2]: https://lore.kernel.org/all/20240612-cm_probe-v2-5-a5b55440563c@xxxxxxxxxxx/ Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx> --- Changes in v2: - Use compatible string instead of property - Link to v1: https://lore.kernel.org/r/20241115-cluster-hci-broken-v1-0-00636800611d@xxxxxxxxxxx --- Gregory CLEMENT (4): dt-bindings: mips: mips-cm: Add a new compatible string for EyeQ6 MIPS: cm: Detect CM quirks from device tree MIPS: CPS: Support broken HCI for multicluster MIPS: mobileye: dts: eyeq6h: Enable cluster support Jiaxun Yang (1): dt-bindings: mips: Document mti,mips-cm .../devicetree/bindings/mips/mti,mips-cm.yaml | 58 ++++++++++++++++++++++ arch/mips/boot/dts/mobileye/eyeq6h.dtsi | 4 ++ arch/mips/include/asm/mips-cm.h | 22 ++++++++ arch/mips/kernel/mips-cm.c | 14 ++++++ arch/mips/kernel/smp-cps.c | 5 +- 5 files changed, 102 insertions(+), 1 deletion(-) --- base-commit: ffc2ac99f7a0dccb6389ea5e318a95965d882dba change-id: 20241115-cluster-hci-broken-840a78f72aae Best regards, -- Grégory CLEMENT, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
