From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.gmx.net (mout.gmx.net [212.227.17.20]) (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 EBB5C37267A; Thu, 25 Jun 2026 20:48:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=212.227.17.20 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782420489; cv=none; b=UqMUKMF7JL9UpY0G9yP+/KlItNYp52VVZBXTfxURhpoiRhjtODOZb/oPwDbKUpJKHfzS66fjBKYkwxuHJE9knNYoLf+0TEhxv6e7oe13ffgFREz7ERJerIeR5BvSLE/Lou8puCfmj3UfIbTkNtzjhKv7CQWaI7To7Gw0Rto0CmA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782420489; c=relaxed/simple; bh=W5cwB5VuK6ZUPVros4aaXIMycAXDpY9OT9u88OjXCjQ=; h=Message-ID:Date:MIME-Version:To:Cc:References:Subject:From: In-Reply-To:Content-Type; b=BS//mZWxCtmxh/dXxDfvd+xNa9pS6ckWdrAoTvOT+TDuo3wpRXwxMi63zKhvAKgooCIixVk3zcDpBSvJ/+kPDoLUtreC0iS0q3O2LBfshsD4wujAfeZ/i7aERj5gS9lMuEoRxSsQiS1inuzU/W3snmOKGebsIlwmVFgHjOLl9Mc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.de; spf=pass smtp.mailfrom=gmx.de; dkim=pass (2048-bit key) header.d=gmx.de header.i=ingo.haenlein@gmx.de header.b=Ipbo+7F3; arc=none smtp.client-ip=212.227.17.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmx.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmx.de header.i=ingo.haenlein@gmx.de header.b="Ipbo+7F3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmx.de; s=s31663417; t=1782420477; x=1783025277; i=ingo.haenlein@gmx.de; bh=W5cwB5VuK6ZUPVros4aaXIMycAXDpY9OT9u88OjXCjQ=; h=X-UI-Sender-Class:Message-ID:Date:MIME-Version:To:Cc:References: Subject:From:In-Reply-To:Content-Type:Content-Transfer-Encoding: cc:content-transfer-encoding:content-type:date:from:message-id: mime-version:reply-to:subject:to; b=Ipbo+7F3jaUWAQHR5eyyrSy+S9xq3362ioX1IAmBP0nXX+POr+MKMgmfOrTXSVwj IHemDBnD3ndcIdwkGeX7ZAcnYmgGJbc7OkU2U7Nm3X/h8ISmDCRhyTcmDS4iCcEbz ziY4iO5nCXK9pMDRHTEs33eh3QuL1qBXJvY5qHHwU1tF4rVUceDay9FQ2gfcyCdQr sZoIAbqc4735GrFwRAyLS/geJ6hEGmvhIuaX4VAUEqxhR1R7hjp+P5i6zmzCEQ3C4 M5MONokmJ8Kr1C3QJeP8nYYlg0bHuQBTaRCcexRT77gxwQsBDTWdN7B54HazjG5uv bCMNqcdWC26fYZScFA== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from client.hidden.invalid by mail.gmx.net (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1M26vB-1waO0q1l1N-003aex; Thu, 25 Jun 2026 22:47:57 +0200 Message-ID: <56a48231-5f1b-4697-a732-bdbddd38a96b@gmx.de> Date: Thu, 25 Jun 2026 22:47:56 +0200 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: chengordon326@gmail.com Cc: Shyam-sundar.S-k@amd.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, mario.limonciello@amd.com, mathias.nyman@intel.com, platform-driver-x86@vger.kernel.org References: <18b4e4f7089aa4f1.da8dbe994ae3bb77.445e21b98b0b205b@GordonMsi> Subject: Re: USB-audio isochronous Missed Service Errors on AMD Zen5 client (Fire Range) -- Data Fabric idle C-state? No OS-level knob found Content-Language: en-US From: Ingo Haenlein In-Reply-To: <18b4e4f7089aa4f1.da8dbe994ae3bb77.445e21b98b0b205b@GordonMsi> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:llMqjXq8i+FGfcD1Tfr1fqg5oUgExy6buB+dRO59J4HOPhs02ak yHST+Kvei0e+ny57uqaUbD4RKQXM75PQLcg+WneOo5XUYnSypJBTAzWF0hTIQJ+KVnzzghq 1JKkgzxKa3SBb6DnW/L7tT+ry9XxTYDyS7GmJJoG6vHaYiiLH3zcmRrKqpZ1PX8VOmS1mWO 5dIqx4qo7zRUqy0qo3inQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:+N/n5Qm1Ry0=;r2siSBnbrAzjBspX5/swwt+Pe+p T7xbixzEuaPDjYbn2oF5zgHCdanRhZ2EwdLEPh/T+8YqTwznrvbqWOUlcer/In5iNvvS8fO6D 3Pljtmf4puGI7qIgAvjI1tAZhwTakBDZVpgpcSRhYxkcLbod46r4v9p7PJ6ibzoq1J9m2qjDg nD/pQcUnE5ozy8bnXBmP0hNhLqUDEagkqzx6v+1xSLNuRG4yrqA5ZKXgjiyf0UvZhWOul4nHh 04m8Ku3UDKogbUesSY8ULXdOeqo4s8ejNI3dPhAuV5SIS5rT6qpfPPSI5RnrZR4ayeLVZh5V0 x5HCbd1mBOqzlvYpG9Tye+cBOZ6vwFN7JF6cStByAIsLoU+v1FyT8LWbYDMuKMY+hPQQKZ6Zc 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Michal Pecio pointed me to your thread from my linux-usb report: https://lore.kernel.org/linux-usb/48aadb68-b4d1-4dd6-82ca-76d0846b4ae1@gmx.de/ Same error class: COMP_MISSED_SERVICE_ERROR / -EXDEV on isochronous USB audio endpoints, sporadic bursts during continuous full-duplex streaming, no DMA error. Same LTC/LTR constellation: HCCPARAMS1 = 0x0118ffc5 (LTC=1), but DevCap2: LTR- on both the xHCI function (c5:00.4) and the upstream internal GPP bridge (00:08.3). One divergence from your Fire Range result: stress-ng --stream does not suppress the issue on Strix Halo, neither with 1 nor with 32 workers. Under full --stream load, amdgpu_top shows GFX_MCLK staying at 1000 MHz -- which is the hardware ceiling on this platform (LPDDR5 400-1000 MHz, per amdgpu_top header). Fire Range reaches 2800 MHz under --stream, which appears to be what keeps the DF out of the problematic idle state. On Strix Halo that lever does not exist: --stream cannot push MCLK beyond 1000 MHz, so the DF can apparently still reach the idle state that causes ISO ring loss. SOCCLK on Strix Halo shows only an average (~650-666 MHz) via amdgpu_top; Cur. reads N/A MHz -- no current-state visibility from the OS, unlike what you can read on Fire Range. So on Strix Halo: same error class, same LTC/LTR contradiction, but the --stream workaround is structurally ineffective due to the lower MCLK ceiling. Your questions to AMD (DF idle / ISO DMA interaction, OS-accessible knob) apply here as well. Do you have any update from AMD on the questions you raised -- in particular whether Set LTV reaches the DF via sideband, and whether there is an OS-accessible knob to hold the fabric active during ISO streaming? Regards, Ingo