From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 483A52F6192 for ; Tue, 30 Dec 2025 07:43:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767080602; cv=none; b=UucfcWce+9V48NYiXoS1bcpDvSOx81zkF+N7o2Hhk5k9n4Ns3RH31LhznPbarIzMWK1aS95tvC2PKkC2ih5nSPGXT9xp9UXWMeUufsg8eDLCvRFClUr5IVtJ7V9nK+u4i+0hkHV17cUCFNLPa3o2V8rcAgjXzqREkywVM/naF/A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767080602; c=relaxed/simple; bh=BNch5eAH7AT7U3YQYOUH4PqOxCOLAk0/vHLjDKuB4DA=; h=Message-ID:Date:MIME-Version:Subject:To:References:Cc:From: In-Reply-To:Content-Type; b=mjK6vn0wwmwwx6PHt+1A95wnu6ttEwZ4WzwZMYji78wXYLBkupIfYU8MfSjCJODED2KIYzaxDwaOysWY2/4hEwtfGxAC2vqNeG4jLAjB3zbmArZC5agykU5Z5GGtGGdPS5ZKOXq8HoOH2zsKS00bOSNt9oCrLHEl1HwFeWq9zyI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 31145396e55311f0a38c85956e01ac42-20251230 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.6,REQID:e4d05931-92e7-46f6-aa18-f4882a64e36a,IP:0,UR L:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION:r elease,TS:0 X-CID-META: VersionHash:a9d874c,CLOUDID:7098c5cf0e72d0b26fb30618a9616474,BulkI D:nil,BulkQuantity:0,Recheck:0,SF:80|81|82|83|102|898,TC:nil,Content:0|15| 52,EDM:-3,IP:nil,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0 ,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 31145396e55311f0a38c85956e01ac42-20251230 X-User: lijiayi@kylinos.cn Received: from [172.25.120.57] [(10.44.16.150)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_128_GCM_SHA256 128/128) with ESMTP id 1410042935; Tue, 30 Dec 2025 15:43:11 +0800 Message-ID: Date: Tue, 30 Dec 2025 15:43:08 +0800 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: Question about commit 8cf9926c537c (thunderbolt: Reset only non-USB4 host routers in resume) To: Mika Westerberg References: <20251230072411.GC2275908@black.igk.intel.com> Cc: linux-kernel@vger.kernel.org From: Jayi Li In-Reply-To: <20251230072411.GC2275908@black.igk.intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 在 2025/12/30 15:24, Mika Westerberg 写道: > Hi, > > On Thu, Dec 25, 2025 at 03:22:29PM +0800, Jayi Li wrote: >> Hi Mika, >> >> Sorry to bother. I have a question about the above commit that I couldn't >> figure out, and I'd really appreciate it if you could help. >> >> The commit message says: "There is no need to reset the USB4 host routers on >> resume because they are reset already."But aside from `nhi_probe`, >> >> I haven't found where this reset occurs in the resume path. Could you please >> clarify where this automatic reset happens or the rationale behind it? > It's done when the router enters Sleep state so there is no need to do > reset on the SW side. I see, so the firmware performs a reset when entering sleep. Thank you for your reply.