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 E7F75286416; Wed, 28 Jan 2026 02:10:01 +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=1769566202; cv=none; b=SxNJ9gJAtUEiGtFRDBLWX4J7ewIHOQlFx4bZu0wZ7tU1B4chW230gKoF0w28C5aEYoUds80x3B0kpbYpGb0lbzkPOPsMBHMJZNyNkB+BgSB/agq7sMdUYkWUav0qw6kxZ3ujdrcTieUwaPK2IzT0IpE1B2274mtF6lRDQ8RlfGQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769566202; c=relaxed/simple; bh=c02Qz508Y2Kp0ercGgCth0mlpDxAua9YE3mNF8P84iE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YY++5s7FLyadBRvxCM0cxWNoFejPF7u1Uo8Y36lQ6vqG8HHc1ow/bjxmpl9191yQymL0t1LOL/wiKmscchAKIAUMNd4CZDQcZg9oCe3YGGH1hYScHwckefzjIrgdkkkV1V/J1wiYRw4dddfIMZ7TOtvIT2us1zSDY/3qJeQBI7g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s39sgDpC; 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="s39sgDpC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66A27C116C6; Wed, 28 Jan 2026 02:10:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769566201; bh=c02Qz508Y2Kp0ercGgCth0mlpDxAua9YE3mNF8P84iE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=s39sgDpCJxAQVaNB6ctusy7+cRhKyyceDPVc3dVlv5yYt/w/BDtw6PWve3PEOs1Et atHQmgK8rdyQU2nuP5MjaNvQhlZakW6d36ZDsNkaL79rrFsxxmt6gLJktJoXfRlrqV yxZDfXJ1YO0w2Lbss2gU/ATO0e8NbzB0CqAR5CrlcNuQ6DvDk10E/uyD9IR0c7mZs+ kc6rmeHRvb24kVENij4iqKbMjiG27HP/8Z7sBaIKbRfnGpNuRExb2jgX5e4FzPAp5N hekA7h0nkVa0cNq+OWUv2EEynHBU9X5EN+W8noLb1bsPcqsggxiSwBIzZ320rAqCWS mnR2AlQzR6ZLQ== Date: Tue, 27 Jan 2026 20:10:00 -0600 From: Rob Herring To: Alexander Wilhelm , Laurentiu Tudor , Li Yang Cc: Shawn Guo , Krzysztof Kozlowski , Conor Dooley , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: USB error on LS1046 platform Message-ID: <20260128021000.GA3716747-robh@kernel.org> References: Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: +Laurentiu, Li On Tue, Jan 27, 2026 at 09:21:38AM +0100, Alexander Wilhelm wrote: > Hello developers, > > I’m using an NXP LS1046A SoC with the integrated DWC3 USB controller in > host mode. On Linux v5.5.167 my USB flash drive was detected and mountable. > After upgrading to Linux v6.6.110 the USB flash drive is no longer > recognized. If it is already plugged in during boot phase I get the > following errors: > > xhci-hcd xhci-hcd.2.auto: Error while assigning device slot ID: Command Aborted > xhci-hcd xhci-hcd.2.auto: Max number of devices this xHCI host supports is 127 > > I have narrowed the issue down to the following commit: > > 136975c33894e7b48a6007af0f4c25f423bbd1de > arm64: dts: ls1046a: make dma-coherent global to the SoC It's best to send this to the author(s) of the commit. Looks like it needs to be reverted or USB marked non-coherent. That's Shawn's responsibility to apply and the author to send a fix (unless you want to). The DT maintainers don't take .dts patches. > > When I revert this commit, USB works perfectly on my system. > > I have already asked on the `linux-usb` mailing list > (https://lore.kernel.org/linux-usb/aTFr17xKxnWGG3vU@FUE-ALEWI-WINX/) and also > forwarded the message to `linux-arm-kernel`, but I haven’t received any replies > so far. Has anyone encountered this problem on the LS1046 or a similar platform? > Any hints or experiences would be greatly appreciated. > > > Best regards > Alexander Wilhelm