From mboxrd@z Thu Jan 1 00:00:00 1970 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 42AC7C38A2D for ; Tue, 25 Oct 2022 01:18:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231535AbiJYBSD (ORCPT ); Mon, 24 Oct 2022 21:18:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231326AbiJYBRt (ORCPT ); Mon, 24 Oct 2022 21:17:49 -0400 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C867DA2; Mon, 24 Oct 2022 17:37:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1666658229; x=1698194229; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=aIsDlS0Elz1Mcqzl683Iegm+ITd+1RVsEuG7flAObfI=; b=BqGbZjtWBeFlJ21qfcpgcT4E++qNm7mLMziBA8OZv0KMNfRmuBGEncXv bkc1J6C42W/wKlfkjTnh2yKugREtVDpz+bSkfAEsgoGH3RuE/QoW78J0S 0Lf5FEcwn5CDL6CEg6hbNwdJXJFuwxJ5OmCfkAxynLHH5Rgjrc/08cbKT 4Lul+HwbX4rz9UUU/kY2jGOZHw0TeUi+mUbOGD18ssf8cmQrZmLeWf5NS iwwM/uAl9oSdP0vJb3bCDPNRxbCStKVaeio1hOL9gAr5a/bFsjxOVVyDp 0HXX41jbgZQ21ApKtj6MkwAK1vdE7c9ueDWpI0Yi5K0bub0rwsjrQadYW w==; X-IronPort-AV: E=McAfee;i="6500,9779,10510"; a="287951842" X-IronPort-AV: E=Sophos;i="5.95,210,1661842800"; d="scan'208";a="287951842" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Oct 2022 17:37:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10510"; a="626246800" X-IronPort-AV: E=Sophos;i="5.95,210,1661842800"; d="scan'208";a="626246800" Received: from linux.intel.com ([10.54.29.200]) by orsmga007.jf.intel.com with ESMTP; 24 Oct 2022 17:37:08 -0700 Received: from debox1-desk4.intel.com (unknown [10.209.125.134]) by linux.intel.com (Postfix) with ESMTP id 22482580897; Mon, 24 Oct 2022 17:37:08 -0700 (PDT) From: "David E. Box" To: nirmal.patel@linux.intel.com, jonathan.derrick@linux.dev, lorenzo.pieralisi@arm.com, hch@infradead.org, kw@linux.com, robh@kernel.org, bhelgaas@google.com, david.e.box@linux.intel.com, michael.a.bottini@intel.com, rafael@kernel.org, me@adhityamohan.in Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH V7 0/4] PCI: vmd: Enable PCIe ASPM and LTR on select hardware Date: Mon, 24 Oct 2022 17:37:03 -0700 Message-Id: <20221025003707.2909390-1-david.e.box@linux.intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This series adds a work around for enabling PCIe ASPM and for setting PCIe LTR values on VMD reserved root ports on select platforms. While configuration of these capabilities is usually done by BIOS, on these platforms these capabilities will not be configured because the ports are not visible to BIOS. This was part of an initial design that expected the driver to completely handle the ports, including power management. However on Linux those ports are still managed by the PCIe core, which has the expectation that they adhere to device standards including BIOS configuration, leading to this problem. The target platforms are Tiger Lake, Alder Lake, and Raptor Lake though the latter has already implemented support for configuring the LTR values. Meteor Lake is expected add BIOS ASPM support, eliminating the future need for this work around. Note, the driver programs the LTRs because BIOS would also normally do this for devices that do not set them by default. Without this, SoC power management would be blocked on those platform. This SoC specific value is the maximum latency required to allow the SoC to enter the deepest power state. This patch addresses the following open bugzillas on VMD enabled laptops that cannot enter low power states. Link: https://bugzilla.kernel.org/show_bug.cgi?id=212355 Link: https://bugzilla.kernel.org/show_bug.cgi?id=215063 Link: https://bugzilla.kernel.org/show_bug.cgi?id=213717 David E. Box (3): PCI: vmd: Use PCI_VDEVICE in device list PCI: vmd: Add vmd_device_data PCI: vmd: Add quirk to configure PCIe ASPM and LTR Michael Bottini (1): PCI/ASPM: Add pci_enable_link_state() drivers/pci/controller/vmd.c | 158 +++++++++++++++++++++++++++-------- drivers/pci/pcie/aspm.c | 54 ++++++++++++ include/linux/pci.h | 7 ++ 3 files changed, 186 insertions(+), 33 deletions(-) base-commit: 247f34f7b80357943234f93f247a1ae6b6c3a740 -- 2.25.1