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b=ZuxMVDeNjTjiVIAIs6VfNH/GEUdESLsIrIoQk1m7J8sjUNXcxG+z3kJxiO3eeXl53DFaxStMCg3XufscezD6iOkZSXvZ0g9UaVgNkEQisH+5QyqhF4VBa9SOTOZRdwkKijz3trofIIhhgCP/Awn6bIPqD87+xvLacG+ZR/lFWh4+EQ0LgvgI8Vfl5ZZIcsxmPbPzGr1vIqsxDToYhXXBW+iwCWZ1bMt+YcZihZvQ9/WcJFHoVPANv20/xv4pjSTr3zpSfj3TWOZVXyc1Vb1S6slv3r4iizjfWucGG3pf7npsLXsIGYkaqHyG3Ywt9+09uTMtQqI2V3WVcf66F0OiTw== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from SJ2PR12MB8784.namprd12.prod.outlook.com (2603:10b6:a03:4d0::11) by DM6PR12MB4041.namprd12.prod.outlook.com (2603:10b6:5:210::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9412.8; Wed, 10 Dec 2025 04:08:51 +0000 Received: from SJ2PR12MB8784.namprd12.prod.outlook.com ([fe80::1660:3173:eef6:6cd9]) by SJ2PR12MB8784.namprd12.prod.outlook.com ([fe80::1660:3173:eef6:6cd9%7]) with mapi id 15.20.9412.005; Wed, 10 Dec 2025 04:08:51 +0000 Message-ID: <7ffdd81b-927e-46f1-976c-91fe2fee4f07@nvidia.com> Date: Wed, 10 Dec 2025 04:08:42 +0000 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/5] memory: tegra186-emc: Support non-bpmp icc scaling To: Krzysztof Kozlowski , Aaron Kling Cc: Rob Herring , Conor Dooley , Thierry Reding , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org References: <20251027-tegra186-icc-p2-v4-0-e4e4f57e2103@gmail.com> <82c8dda8-6fcb-48f9-bdaa-f3d1431e41ae@nvidia.com> <99ca4992-5736-417d-854e-379542549bee@kernel.org> <7f3dad08-cff5-40c2-8e7f-f6441a3d6b91@nvidia.com> <249bbe7e-e2da-4493-bdd5-8f4b17aff8fe@nvidia.com> <29cf2c16-3a0e-42c5-a083-16f77ae5d09a@nvidia.com> <63be3373-1ab4-4aa4-aa7a-0175727aa9a3@kernel.org> <83142b0c-0743-4a23-8846-e9f5e72a7677@kernel.org> From: Jon Hunter Content-Language: en-US In-Reply-To: <83142b0c-0743-4a23-8846-e9f5e72a7677@kernel.org> Content-Type: text/plain; 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The >>>>>>> standard arm64 defconfig enables the t194 pcie driver as a module. And >>>>>>> my simple busybox ramdisk that I use for mainline regression testing >>>>>>> isn't loading any modules. If I set the pcie driver to built-in, I >>>>>>> replicate the issue. And I don't see the issue on my normal use case, >>>>>>> because I have the dt changes as well. >>>>>>> >>>>>>> So it appears that the pcie driver submits icc bandwidth. And without >>>>>>> cpufreq submitting bandwidth as well, the emc driver gets a very low >>>>>>> number and thus sets a very low emc freq. The question becomes... what >>>>>>> to do about it? If the related dt changes were submitted to >>>>>>> linux-next, everything should fall into place. And I'm not sure where >>>>>>> this falls on the severity scale since it doesn't full out break boot >>>>>>> or prevent operation. >>>>>> >>>>>> Where are the related DT changes? If we can get these into -next and >>>>>> lined up to be merged for v6.19, then that is fine. However, we should >>>>>> not merge this for v6.19 without the DT changes. >>>>> >>>>> The dt changes are here [0]. >>>> >>>> To confirm, applying the DT changes do not fix this for me. Thierry is >>>> having a look at this to see if there is a way to fix this. >>>> >>>> BTW, I have also noticed that Thierry's memory frequency test [0] is >>>> also failing on Tegra186. The test simply tries to set the frequency via >>>> the sysfs and this is now failing. I am seeing .. >> >> With this patch dropped from -next, what needs to happen to get it >> requeued? I gave an analysis over two weeks ago and have seen no >> response since. > > Hm, I did not see the root cause identified, so maybe I missed something. > > Anyway, I am waiting for the patchset to be retested and resent. And > testing MUST include kernel development process rules, including how > patches are taken - see maintainer soc profile. Any dependencies must be > clearly marked. Yes me too. I am happy to re-test any updates. Jon -- nvpublic