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 360702BE7C3; Sat, 22 Nov 2025 12:01:40 +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=1763812900; cv=none; b=MrIT0zlw+S91IoxRWso4fyPUGg2Yb5Adz6j3zxxZJ3b02sNXMt+5JKDLlTiDMSQDHONfWO9Say19dx1W97fL91CwEMmkJyuRvsJdVxJA3w6aD9hSU5/ffk8hw833z9fwGFfp/urYas/PPjyGtDXIbA50BlGWaLzzpmQY5q3GCAY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763812900; c=relaxed/simple; bh=XWBbd8PVRhZM8wc6yBCPmElsypPzxi68MXain8SPJ6w=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ktfgLrDQjFUPwyFYDE8c9juR+ZSulsY91WTSpSWXzan9CAneXNmKBs/7oVTeEdFhysOuGRX2oDKxc8K2jo3D+mgdnbhaICJOZZ+eLOu8Zz0kSFM425qTR3fdMUr2hYP18tt0I81yB4a5bBsdwoXHafnVh2xfb0DiLDz6mYIXkRw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nyqmwD47; 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="nyqmwD47" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45832C4CEF5; Sat, 22 Nov 2025 12:01:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763812900; bh=XWBbd8PVRhZM8wc6yBCPmElsypPzxi68MXain8SPJ6w=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=nyqmwD47tRSFz1kRny8X2MwFl1kyOHTX3ZEDOvg9Fsta24Wv7jlM7yksQ3q2aVGT2 Q9LlQWDWWq2w3xQeNKSK4h4Wyvkm60m85sXFHxmibwoyvyExEGpuvVsMqMz09zi5Cy wgzuXwBZrKBud6cTnbwPxWErJcy5Ruac0uFH+WvCevaDgp8u8fTwJjrSdjuoUAS56L LIhTIkFagU0yf1VU/NsHt1QsTy6s9BBpd9/qIrV77JIBnfWI+MqzsJjx3gLDC2Fyfs Jv6eA9lDnpUtnx2pB9SI5KRmc78owCmfor9KGxg7TSZC382KwFZp9kZPsnX7scinJd dAEntU42IjtMQ== Message-ID: <63be3373-1ab4-4aa4-aa7a-0175727aa9a3@kernel.org> Date: Sat, 22 Nov 2025 13:01:36 +0100 Precedence: bulk X-Mailing-List: devicetree@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> <29cf2c16-3a0e-42c5-a083-16f77ae5d09a@nvidia.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 21/11/2025 12:21, Jon Hunter wrote: > > On 12/11/2025 07:21, Aaron Kling wrote: >> On Wed, Nov 12, 2025 at 12:18 AM 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 >>> 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 .. The pull request was not yet merged, so I can amend it. The issue was reported 12 days ago, so if this cannot be fixed in for such time, then it is not yet ready and I will drop the changes. Best regards, Krzysztof