From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 442CF30F942; Wed, 12 Nov 2025 11:42:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762947758; cv=none; b=UIiA4RB9uJ6+NViSwswQHOu36g3DQReFq1Y8vWw/bCqHAldn69Xr1RpQgNbqp6KSL2jqeGoImNvzQmjSPNv3bI4Sbk+vNIZl87TBd7RH8cjTumCn/nUrtH2BUPQKjTkCLEV/77Z2zKb6CcmfSoKIyaijr+Wf2dfQJQ7FKg9jZ4c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762947758; c=relaxed/simple; bh=eGXVjyN2gU3c98TqA6g4X6RPbiAYvZ0DrQW2rVqe920=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=o/4bk9jxkyJo1Ghb5+kGZPC0T/PFhmZJCrlY2iEUiWEi0zB5BSaLhkEMILsgBvDesaCmpUJ53naE+i01OpxPnKHvPisrk8RhZVxHF7g59vTkOvc0SAjx35S+WKneA+VsFnDqpYrEiit1xkJdDCbJB3FTBaZa0gZH1A7DtJKnqpM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=b77TCuMw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="b77TCuMw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D5C77C116B1; Wed, 12 Nov 2025 11:42:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762947758; bh=eGXVjyN2gU3c98TqA6g4X6RPbiAYvZ0DrQW2rVqe920=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=b77TCuMwNKwiazbu6HS5iMj0RCjxoZyVlC33/AFZaqz129ymVNLna9CQTnmmptsh8 XqEWTICdEWH/nOq2nIcKHAOIiAlsF4jAQhW8socuH2WQLOsOUTMvaaZrV1Ndg4VdPo aPzXN5FZWTGQ4VgYVB7+HT6AcNYyiqn3i4L2E39mgkNQMfVMUEUg+6ETJ1X5Olf6Qk 2Yy4qTZB+/PeH7XaJVQ19U9G4eKqoO1jztwIfG2nSyizzfTPuFLUHho/VVGUwWslP7 t91mS07mCIh3xHiX8chgynlpTK+2ueORVnOmf42WmdBDaG2pYOLtnl1S6+iEUi7DyT Ocg6/EsDBBH5w== Message-ID: Date: Wed, 12 Nov 2025 12:42:33 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/5] memory: tegra186-emc: Support non-bpmp icc scaling To: Jon Hunter , 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> <20251027-tegra186-icc-p2-v4-3-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> <6904a858-d7a3-457b-8141-692238d01582@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 12/11/2025 11:59, Jon Hunter wrote: > > On 12/11/2025 07:26, Krzysztof Kozlowski wrote: >> On 12/11/2025 07:18, Jon Hunter wrote: >>> >>> On 11/11/2025 23:17, Aaron Kling wrote: >>> >>> ... >>> >>>> Alright, I think I've got the picture of what's going on now. 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 >> >> It's still breaking all the users then. > > Yes indeed. Please test if dropping sync_state from memory controller drivers helps you. This might be the easiest fix and it is also known solution when there are no users. Best regards, Krzysztof