From patchwork Thu Jun 15 07:04:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 13280796 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E833EB64D9 for ; Thu, 15 Jun 2023 07:05:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231789AbjFOHFT (ORCPT ); Thu, 15 Jun 2023 03:05:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35244 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231532AbjFOHFR (ORCPT ); Thu, 15 Jun 2023 03:05:17 -0400 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C0491189; Thu, 15 Jun 2023 00:05:15 -0700 (PDT) Received: from localhost.localdomain (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 4C95D40269; Thu, 15 Jun 2023 07:05:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1686812712; bh=JQEHjRZJS7f+wPWPTWCz0/KyMNju+7pW2sGQ4+QglqI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=E++pMoFjUUcROaBFf25crp9Mxsq8B72w+rwc+mkdmRkPcXI3Q4YJXn8JJ+Unc4s48 HXi1nrw6K/Muvna1tm+QxQvk+2jbn0lJ4XKHQGtj+frRs/5SjSnKpkYQj66AyKmefz 34vkLHq9tuVBpCWv+RwspT++MyWomxuGJ8nVGYhuMjBu9eGrXYDufe/YBHefgIToP1 8qgE/trMc3ngPZH+NZzsP0TYATUzY42+52l0CkiEitKWaup5Sfq0Wbw0TL9CYSng+n 5ZTXJN8xJozGPOT2U0GDULzSzQ98YvElFYqCFwIlZKVYIs3gN8B9iFmp37ngI7usZJ +m0k+WU8vJCRg== From: Kai-Heng Feng To: bhelgaas@google.com Cc: Kai-Heng Feng , Mario Limonciello , Mika Westerberg , Kuppuswamy Sathyanarayanan , Vidya Sagar , Michael Bottini , "Rafael J. Wysocki" , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] PCI/ASPM: Enable ASPM on external PCIe devices Date: Thu, 15 Jun 2023 15:04:20 +0800 Message-Id: <20230615070421.1704133-1-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org When a PCIe device is hotplugged to a Thunderbolt port, ASPM is not enabled for that device. However, when the device is plugged preboot, ASPM is enabled by default. The disparity happens because BIOS doesn't have the ability to program ASPM on hotplugged devices. So enable ASPM by default for external connected PCIe devices so ASPM settings are consitent between preboot and hotplugged. On HP Thunderbolt Dock G4, enable ASPM can also fix BadDLLP error: pcieport 0000:00:1d.0: AER: Corrected error received: 0000:07:04.0 pcieport 0000:07:04.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Receiver ID) pcieport 0000:07:04.0: device [8086:0b26] error status/mask=00000080/00002000 pcieport 0000:07:04.0: [ 7] BadDLLP The root cause is still unclear, but quite likely because the I225 on the dock supports PTM, where ASPM timing is precalculated for the PTM. Cc: Mario Limonciello Cc: Mika Westerberg Link: https://bugzilla.kernel.org/show_bug.cgi?id=217557 Signed-off-by: Kai-Heng Feng --- drivers/pci/pcie/aspm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 66d7514ca111..613b0754c9bb 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -119,7 +119,9 @@ static int policy_to_aspm_state(struct pcie_link_state *link) /* Enable Everything */ return ASPM_STATE_ALL; case POLICY_DEFAULT: - return link->aspm_default; + return dev_is_removable(&link->downstream->dev) ? + link->aspm_capable : + link->aspm_default; } return 0; }