From nobody Wed Feb 11 16:50:16 2026 Received: from mail-pf1-f170.google.com (mail-pf1-f170.google.com [209.85.210.170]) (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 533754AEC6 for ; Mon, 24 Jun 2024 08:18:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719217138; cv=none; b=B9aokcqhU7Pw7T9FppVCzPjRnPd9V5uiyUA3qYZIiv11C3kksPxt/SbFhsl1eJ1IKGVki1GhIRAtMUUlu/c/pBNU+82xtP1YGnxu1oGwTlw5IiLDb7knu4nxPDihRoxg4nCVu1SEsqzwF2c/frikup/XwJ6v3Gro7gPVvNsQQsI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719217138; c=relaxed/simple; bh=myRZ1WzGtVF+5eRnikKNFfYxz/D/CFBKuWmxRIRoysQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qDWciJ3bKDmn7v8vVFOaMA9pTyIxXEF7/qnwO6ni1mag2hV+tXmgI7YDKge0fNOe30kyqpSPVpBlRfQieOWjCbEe8ANMt/n15+NbxdfmmrLeyvlhiKzs2Q9j/i2IML8nCcy70ESOBN/EVprgOqpJcMm1cou1Kk2rjggs34sRCLQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=endlessos.org; spf=pass smtp.mailfrom=endlessos.org; dkim=pass (2048-bit key) header.d=endlessos.org header.i=@endlessos.org header.b=nk2hGmy5; arc=none smtp.client-ip=209.85.210.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=endlessos.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=endlessos.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=endlessos.org header.i=@endlessos.org header.b="nk2hGmy5" Received: by mail-pf1-f170.google.com with SMTP id d2e1a72fcca58-70665289275so866574b3a.0 for ; Mon, 24 Jun 2024 01:18:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=endlessos.org; s=google; t=1719217137; x=1719821937; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Cwvf9W24UthLlcjVjH4PS05a8L60/p4gOZ+dA+VoDlg=; b=nk2hGmy5wqfqdcz39L7zILRWoNtBdpYI4O5X3tcHRe1++mTL1OFaHZH/fMJ2Yr5kJi 0jWSc5ur9k1imHL5HXsj2u4rsaynY9+mLNCbLJKqTn2lUgfJqWb6QL6RLLKsV1xzWU6p ITfe7aAR3npV5cEiIcixv4Csl+tdMhy4DqPrfo8AQ0riVJ9RamYA9I/vvY0+Cci3Y7n2 cjkqL33hQWZOBJ7y3MjOv0LsbKHncSlOFJ5cY83ICkDgd5SlvzQPzNatUyEv4FwCJi/6 5Nir5FRPFQZk8guOmFdGxyawES33on/u4Bnp4Mbm16YfhR83lysOcSH7bnPED+wig90f LYqg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719217137; x=1719821937; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Cwvf9W24UthLlcjVjH4PS05a8L60/p4gOZ+dA+VoDlg=; b=F6pOycA6zGs4YsUcR6iSZzD3hsRZB+7MDsamJoJvk0Xc8rxKYYcnwx95hbkWQ4ZPkJ opv/Ls1SZT+VUFbEO7ps+pQPJwINzfLrkZxdWaBfhCCDScuNXec4ySZZwjXk1gxj/ydx 316XR7mwE72DlG+o0ZauWeshh0ih1Nz0dwiHVm/NwVJlPGb0G501ToJ6kJ4pR/pQlgIU WJigTw7UiY64Yfib93NnxXwJJSzjjdYNAPTSMsgVJuRJLlzpsn4KWsji1Fk++krj5iZJ 82OyDuFesRA76wNdqHTosnCVFHyS6gVrnzvMN2a/krpHvYhi0vnoWtleumym6A6VrPeH 632A== X-Forwarded-Encrypted: i=1; AJvYcCU97UKl9cLyy4TAaAD59JpZPeaPh+ctyRSkFzbTcTuyBcwjez9Wwu8fYwrfJqRcd6CrYqzJo7K0W4C/BPA79cCG4udMNsHvr6fYyixT X-Gm-Message-State: AOJu0YzJqxw+B/84uDOsVUng7jLhBJq3KZBHX9AZg1y8CFEAIvgwRGQb 9eZW/dPMP3gv4lSLJqCe8wg1QB4y9TPpYzoV3tNQ6rdkiiaUjIhYLSYR610jXeVttx/P4Lm7p7y M X-Google-Smtp-Source: AGHT+IHKpPCbjA9Lpt04pm8JLXalr5L14MoJzaRmUc7pzlkDhUthY4DIreywW2pKD9J9izxAUgoIRA== X-Received: by 2002:a05:6a20:9782:b0:1bc:b69f:1d93 with SMTP id adf61e73a8af0-1bceccebd90mr5968012637.17.1719217136462; Mon, 24 Jun 2024 01:18:56 -0700 (PDT) Received: from localhost.localdomain ([123.51.167.56]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-706512fed18sm5634954b3a.181.2024.06.24.01.18.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jun 2024 01:18:56 -0700 (PDT) From: Jian-Hong Pan To: Bjorn Helgaas Cc: Johan Hovold , David Box , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Kuppuswamy Sathyanarayanan , Mika Westerberg , Damien Le Moal , Nirmal Patel , Jonathan Derrick , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux@endlessos.org, Jian-Hong Pan , Bjorn Helgaas Subject: [PATCH v6 2/3] PCI/ASPM: Add notes about enabling PCI-PM L1SS to pci_enable_link_state(_locked) Date: Mon, 24 Jun 2024 16:17:50 +0800 Message-ID: <20240624081749.10219-2-jhp@endlessos.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240624081108.10143-2-jhp@endlessos.org> References: <20240624081108.10143-2-jhp@endlessos.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" According to "PCIe r6.0, sec 5.5.4", add note about D0 requirement in pci_enable_link_state() kernel-doc. Signed-off-by: Jian-Hong Pan Acked-by: Bjorn Helgaas Reviewed-by: Kuppuswamy Sathyanarayanan --- v3: - Fix as readable comments v4: - The same v5: - Tweak and simplify the commit message v6: - The same drivers/pci/pcie/aspm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index cee2365e54b8..bd0a8a05647e 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1442,6 +1442,9 @@ static int __pci_enable_link_state(struct pci_dev *pd= ev, int state, bool locked) * touch the LNKCTL register. Also note that this does not enable states * disabled by pci_disable_link_state(). Return 0 or a negative errno. * + * Note: Ensure devices are in D0 before enabling PCI-PM L1 PM Substates, = per + * PCIe r6.0, sec 5.5.4. + * * @pdev: PCI device * @state: Mask of ASPM link states to enable */ @@ -1458,6 +1461,9 @@ EXPORT_SYMBOL(pci_enable_link_state); * can't touch the LNKCTL register. Also note that this does not enable st= ates * disabled by pci_disable_link_state(). Return 0 or a negative errno. * + * Note: Ensure devices are in D0 before enabling PCI-PM L1 PM Substates, = per + * PCIe r6.0, sec 5.5.4. + * * @pdev: PCI device * @state: Mask of ASPM link states to enable * --=20 2.45.2