From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f52.google.com (mail-wm1-f52.google.com [209.85.128.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6285F4756C1 for ; Thu, 15 Oct 2026 09:17:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792055860; cv=none; b=ARAM1S/0MbBzo0r3kjVkBQT5KfEwamWW5nNC9O80QB0WG36o1m1sKyBpqrpZ6LyWk+5e7A08yGcA+l3b2L/ivWlqwfYy5HWQarQHVPVukA1h5NYh87aTxHZY5MsCeU/dGS3TsCvgK1QzytEbzQSjPmlvOhgF1CzaJkTVAQlPTGk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792055860; c=relaxed/simple; bh=IyAZ5pkLnMxh94MB73YiJMR++H7wpdk5msxW3CzpIr8=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=O2cKTaTmnQkJXiVRW/v1NPVGBwqVw3Kd/s08UUTppGRoAAdaPgVzbSpPYIH3YfZBGJcAhi9wTyFCT0LM/3x7qWnvjLK6TuhzdGP000MjvXmW4I0H2aGI84i0g6RYl4T0/jSeSKJNSSRRhlbeydO43sR+/2lOErIOldFefEl3U7o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=flDoxF/L; arc=none smtp.client-ip=209.85.128.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="flDoxF/L" Received: by mail-wm1-f52.google.com with SMTP id 5b1f17b1804b1-49d0da752ffso15265705e9.3 for ; Thu, 15 Oct 2026 02:17:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1792055857; x=1792660657; darn=vger.kernel.org; h=content-transfer-encoding:content-type:mime-version:references :in-reply-to:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=ylxkGWPRhbu3wMGo/t9b6unbwGCeSJctOEWu1P2KuE8=; b=flDoxF/LpcIqI0znL5gDzl8mSaP/F2cVRDzFPmsH+Z0PoO75VrN87kYckUGBhHuF6j ULyWq3oXGZ4GBIa2HztDtxbSiY2aI3NIUqySMdCH4uF5kdEbtex/7qLcq98iDBm1QIoj wbl0D/BiAhGbE6XbBuX7g7EgjRRTKX4bmZiTbc8mJfMrBqZZZfufaFXqsZJa72tNd/6B rqqDFwd2BB+6x9tztoOHIMifZsW5/cqoccGXrVBtF7EH8lymZoh9VRnMTvRyRNsna3Kj woG4PtvWWALQ+xgmIgiSfDUBJU4d64Uf3AfUnGAVJ7pKxbiAbeZFeA9/Q+916wCdWkDz E7lg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1792055857; x=1792660657; h=content-transfer-encoding:content-type:mime-version:references :in-reply-to:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=ylxkGWPRhbu3wMGo/t9b6unbwGCeSJctOEWu1P2KuE8=; b=f8tKR2AfZQzW7YYMnXRGeIXBOA7hIYxd3PEKJolvSaS+TQfFx//l3CnQWiU8LCq+Ut oThz1gZ2gZ9xt9iW0uVyD+u9uRWlUjBGkWmYtDopdRL9JZbPRSehKMRlGMBN8WkJAMIN cpPfasM4BgfMgg2e9+kUc9nwzZ+oN2UMEsRL8BH7nkiAaTKl7gr9NFATeyzlzFK70kRW ivMN7gcg9DL5wy07HQVqd5pDI11JEDN8bPOySsN0wrqS5h+JVjaGGs43Gro9/JfswKna n+t13pfIh0ZqxiQV54iiFqeJy8zbLJo/1L0AvWnoD+v4uYw2DWk43387z3QJhWupQZkq /zvw== X-Forwarded-Encrypted: i=1; AKwUvBz1L0ClmyVKCViGh0ts1jqoBDE9Mjq6sRvyM4VSoYs7qsVXdkD7KlpHs2CRQMrLTuE0F7gAluRXlI8nYVc=@vger.kernel.org X-Gm-Message-State: AFq9FYJvHdLtELDW0FLeQYvmPz8xwpRAXLaU9ZlBtuhlXfAO/wJxQ8DP VsnSFxg0wSanUkTccwnWpcX2xtHxVJ8kRsKVGa2hVyTUVvKnwOEs4Ohz X-Gm-Gg: AYBFou0ZV8kXAj6TcdqDBs+pj7WRedIoHZwdO2gCqujleevoXFKXj4eW1sK/HH+gvoo lDDBCfN4gPx1B+G/27oQ9amXpWMn8RssvcGmhBgHVh3MzfYapHafMDjoHp4Ctua0YUaK/m9HodM NlQNaf7v4Wy79TKX/hhKwga9ez31/67kbdq5KG4xnQpGbLDVI/RSTZiroKfwUs3DL1jlBdotldf Hz4ZHyYaCLdILiVS1csbX+cFtcNC/SI/3auYHy2HRGXbM5CESy17zszYd+2b8OoxGbamOtHF1M8 ofRh/BqBOawhAXYDBoDeLtztk2HaiVocnnf3m3slHgHKqyO9jFT+f5V7OQJ3Xvkl6aF2nZEZfM2 AQ7SJtCkttASibpKTEN7w/Oxg4tXrNxnkdQqtK7D4qSRkfMKuTNP5kF8nq9RV5lfWQvZi2cr7EY FukAyH8j05vrIBcDOezMunzDU5OHeancCDf2q+5lYuK3UfTMoJfti7UBbqIRz3RqFmTeY2zH/tn 5CJFoRYuyQ= X-Received: by 2002:a05:600c:3111:b0:4a0:159b:d2a2 with SMTP id 5b1f17b1804b1-4a18e4e14e8mr351253395e9.29.1792055857375; Thu, 15 Oct 2026 02:17:37 -0700 (PDT) Received: from foxbook (bez186.neoplus.adsl.tpnet.pl. [83.28.37.186]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48de72d2b13sm12304181f8f.55.2026.10.15.02.17.36 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 15 Oct 2026 02:17:37 -0700 (PDT) Date: Thu, 15 Oct 2026 11:17:33 +0200 From: Michal Pecio To: Mario Limonciello Cc: Rishabh Jain , Mathias Nyman , Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v5] usb: pci-quirks: always assert xHCI OS ownership Message-ID: <20261015111733.5ead367c.michal.pecio@gmail.com> In-Reply-To: <7d64e267-8ca6-4130-bd4a-d80fb4224f72@kernel.org> References: <20260902052631.75c6068b.michal.pecio@gmail.com> <178832755831.50581.1058201741431375556@gmail.com> <7d64e267-8ca6-4130-bd4a-d80fb4224f72@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 12 Oct 2026 15:14:14 -0500, Mario Limonciello wrote: > On 9/2/26 00:39, Rishabh Jain wrote: > > The xHCI ownership protocol requires the OS driver to assert the HC OS > > Owned semaphore before using the host controller, then wait for HC BIOS > > Owned to clear if firmware owns it. > > > > quirk_usb_handoff_xhci() currently asserts OS Owned only when BIOS Owned > > is already set. If firmware leaves BIOS Owned clear, Linux uses the xHC > > while both ownership semaphores remain clear. > > > > The timeout fallback also clears BIOS Owned using the original register > > value, which can clear OS Owned at the same time. > > > > On an AMD PROM21 xHCI controller (1022:43fc), this caused every S3 > > resume to terminate Controller Restore State with USBSTS 0x401. Linux > > then reset the host controller, both root hubs and the USB Bluetooth > > adapter. > > > > The controller entered resume ready and halted with USBSTS 0x1. > > Endpoint state, 100 ms save/restore delays, scratchpads, the DCBAA, > > device contexts and command, event and transfer rings were verified not > > to cause the restore error. > > > > Across four S3 cycles, asserting only HC OS Owned changed USBLEGSUP from > > 0x00000801 to 0x01000801 and eliminated the restore failure. Testing > > included the unmodified 7.1.8-ogc1.1.fc44.x86_64 distribution kernel > > using a test module that set the HC OS Owned semaphore. The same test > > was repeated after review with the same result. Clearing USBLEGCTLSTS > > was independently verified to be unnecessary. > > > > Always assert OS Owned for controllers using the standard xHCI handoff, > > and leave the existing TI/Renesas forced handoff unchanged. Keep OS > > Owned asserted after the standard handoff, including when forcing BIOS > > Owned clear after a timeout, to prevent firmware from reclaiming the > > controller during subsequent suspends. > > > > Fixes: 66d4eadd8d06 ("USB: xhci: BIOS handoff and HW initialization.") > > Cc: stable@vger.kernel.org > > Assisted-by: LLM > > Signed-off-by: Rishabh Jain > > --- > > Reviewed-by: Mario Limonciello (AMD) Yes, this fixes a legit issue and would be worth getting in mainline. Two users confirmed the patch works for them, though no one could be bothered to post proper Tested-by here :( https://lore.kernel.org/linux-usb/P1FsfbW--F-9@tuta.io/ https://lore.kernel.org/linux-usb/CY8PR14MB59803EC0F6C7FD39A6D3C42FA0BF2@CY8PR14MB5980.namprd14.prod.outlook.com/ > > > I kept val unchanged for the error log, restored the original handshake > > formatting, and explicitly preserve OS Owned when forcing BIOS Owned > > clear after a timeout. Documented timeout issue in commit message. > > > > I repeated the same S3 test on the unmodified > > 7.1.8-ogc1.1.fc44.x86_64 distribution kernel using the test module, with > > the same successful result. > > > > Changes in v5: > > - Preserve the original ownership value for error logging. > > - Restore the original handshake formatting. > > - Explicitly retain OS Owned in the timeout fallback. > > > > drivers/usb/host/pci-quirks.c | 13 ++++++++----- > > 1 file changed, 8 insertions(+), 5 deletions(-) > > > > diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c > > index 0404489c2f6a..2b12a35e6f10 100644 > > --- a/drivers/usb/host/pci-quirks.c > > +++ b/drivers/usb/host/pci-quirks.c > > @@ -1193,10 +1193,11 @@ static void quirk_usb_handoff_xhci(struct pci_dev *pdev) > > && pdev->device == 0x0014)) { > > val = (val | XHCI_HC_OS_OWNED) & ~XHCI_HC_BIOS_OWNED; > > writel(val, base + ext_cap_offset); > > - } > > - > > - /* If the BIOS owns the HC, signal that the OS wants it, and wait */ > > - if (val & XHCI_HC_BIOS_OWNED) { > > + } else { > > + /* > > + * Perform the standard handoff and leave OS ownership set to > > + * keep the BIOS at bay during subsequent suspends. > > + */ > > writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset); > > > > /* Wait for 1 second with 10 microsecond polling interval */ > > @@ -1208,7 +1209,9 @@ static void quirk_usb_handoff_xhci(struct pci_dev *pdev) > > dev_warn(&pdev->dev, > > "xHCI BIOS handoff failed (BIOS bug ?) %08x\n", > > val); > > - writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset); > > + writel((val | XHCI_HC_OS_OWNED) & > > + ~XHCI_HC_BIOS_OWNED, > > + base + ext_cap_offset); > > } > > } > > >