Bug#981186: linux: Enable CMN-600 interconnect on arm64

From	Wookey <wookey@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#981186: linux: Enable CMN-600 interconnect on arm64
Date	2021-01-27 14:10 +0100
Message-ID	<BBSK6-4YS-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Source: linux
Version: Please enable ARM CMN-600 power management on arm64
Severity: normal
Tags: patch

Current arm hardware such as graviton2 (AWS arm64 hardware) has
'Coherent Mesh Network' interconnect (between components in a
soc). It's important that support for this is built in the kernel so
it can be used.

This requires CONFIG_ARM_CMN=y

This explains what the feature is:
https://www.arm.com/products/silicon-ip-system/corelink-interconnect/cmn-600
Graviton2:
https://www.anandtech.com/show/15578/cloud-clash-amazon-graviton2-arm-against-intel-and-amd

patch attached:
--- debian/config/arm64/config~	2021-01-27 04:34:51.359552398 +0000
+++ debian/config/arm64/config	2021-01-27 04:53:11.922998842 +0000
@@ -942,6 +942,7 @@
 CONFIG_ARM_CCI400_PMU=y
 CONFIG_ARM_CCI5xx_PMU=y
 CONFIG_ARM_CCN=y
+CONFIG_ARM_CMN=y
 CONFIG_QCOM_L2_PMU=y
 CONFIG_QCOM_L3_PMU=y
 CONFIG_XGENE_PMU=y

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Bug#981186: linux: Enable CMN-600 interconnect on arm64 Wookey <wookey@debian.org> - 2021-01-27 14:10 +0100
  Bug#981186: linux: Enable CMN-600 interconnect on arm64 Noah Meyerhans <noahm@debian.org> - 2021-02-02 22:40 +0100
  Bug#981186: linux: Enable CMN-600 interconnect on arm64 Wookey <wookey@wookware.org> - 2021-03-17 03:30 +0100
  Processed: Re: Bug#981186: linux: Enable CMN-600 interconnect on  arm64 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-03-17 15:00 +0100
  Processed: Re: Bug#981186: linux: Enable CMN-600 interconnect on  arm64 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-03-17 15:00 +0100
  Bug#981186: linux: Enable CMN-600 interconnect on arm64 Vincent Blut <vincent.debian@free.fr> - 2021-03-17 15:00 +0100
    Bug#981186: linux: Enable CMN-600 interconnect on arm64 Wookey <wookey@wookware.org> - 2021-03-17 17:00 +0100
      Bug#981186: linux: Enable CMN-600 interconnect on arm64 Vincent Blut <vincent.debian@free.fr> - 2021-03-17 19:50 +0100
        Bug#981186: linux: Enable CMN-600 interconnect on arm64 Wookey <wookey@wookware.org> - 2021-03-17 20:30 +0100
          Bug#981186: linux: Enable CMN-600 interconnect on arm64 Vincent Blut <vincent.debian@free.fr> - 2021-03-17 22:10 +0100
            Bug#981186: linux: Enable CMN-600 interconnect on arm64 Salvatore Bonaccorso <carnil@debian.org> - 2021-03-19 10:00 +0100

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