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. In this third version, I rebased on v6.13. I also addressed remarks made by Rob and Krzysztof, and endeavored to add more explanation about CM, explaining why we now need to represent it in the device tree. 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 v3: - Provide a more detailed explanation about the CM in the device tree binding. - Make the reg property optional for all compatible strings. - Use "mobileye" instead of "mti" for the eyeq6-cm compatible string. - Address and correct the formatting issues in example and description. - Link to v2: https://lore.kernel.org/r/20250116-cluster-hci-broken-v2-0-fc52cfb7a19e@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 (5): dt-bindings: mips: Document mti,mips-cm 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 .../devicetree/bindings/mips/mti,mips-cm.yaml | 57 ++++++++++++++++++++++ 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, 101 insertions(+), 1 deletion(-) --- base-commit: 24da360081efcc12be3f346b6822a91fcb142027 change-id: 20241115-cluster-hci-broken-840a78f72aae Best regards, -- Grégory CLEMENT, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
