From patchwork Sat Apr 9 13:28:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 12807919 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 03928C433FE for ; Sat, 9 Apr 2022 13:28:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237516AbiDINbE (ORCPT ); Sat, 9 Apr 2022 09:31:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241884AbiDINbD (ORCPT ); Sat, 9 Apr 2022 09:31:03 -0400 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA46BADD5F; Sat, 9 Apr 2022 06:28:54 -0700 (PDT) Received: from localhost (127.0.0.1) (HELO v370.home.net.pl) by /usr/run/smtp (/usr/run/postfix/private/idea_relay_lmtp) via UNIX with SMTP (IdeaSmtpServer 5.0.0) id 1352328eb26ee335; Sat, 9 Apr 2022 15:28:52 +0200 Received: from kreacher.localnet (89-77-51-84.dynamic.chello.pl [89.77.51.84]) (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 v370.home.net.pl (Postfix) with ESMTPSA id C220366BCD0; Sat, 9 Apr 2022 15:28:51 +0200 (CEST) From: "Rafael J. Wysocki" To: Linux PCI Cc: Linux PM , LKML , Bjorn Helgaas , Mika Westerberg Subject: [PATCH v1 7/7] PCI/PM: Rearrange pci_set_power_state() Date: Sat, 09 Apr 2022 15:28:38 +0200 Message-ID: <1938958.usQuhbGJ8B@kreacher> In-Reply-To: <4419002.LvFx2qVVIh@kreacher> References: <4419002.LvFx2qVVIh@kreacher> MIME-Version: 1.0 X-CLIENT-IP: 89.77.51.84 X-CLIENT-HOSTNAME: 89-77-51-84.dynamic.chello.pl X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvvddrudekvddgfeelucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffufffkjghfggfgtgesthfuredttddtjeenucfhrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqeenucggtffrrghtthgvrhhnpedvjeelgffhiedukedtleekkedvudfggefhgfegjefgueekjeelvefggfdvledutdenucfkphepkeelrdejjedrhedurdekgeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeekledrjeejrdehuddrkeegpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqpdhnsggprhgtphhtthhopeehpdhrtghpthhtoheplhhinhhugidqphgtihesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehhvghlghgrrghssehkvghrnhgvlhdrohhrghdprhgtphhtthhopehmihhkrgdrfigvshht vghrsggvrhhgsehlihhnuhigrdhinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=5 Fuz1=5 Fuz2=5 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Rafael J. Wysocki The part of pci_set_power_state() related to transitions into low-power states is unnecessary convoluted, so clearly divide it into the D3cold special case and the general case covering all of the other states. Also fix a potential issue with calling pci_bus_set_current_state() to set the current state of all devices on the subordinate to D3cold without checking if the power state of the parent bridge has really changed to D3cold. Signed-off-by: Rafael J. Wysocki --- drivers/pci/pci.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) Index: linux-pm/drivers/pci/pci.c =================================================================== --- linux-pm.orig/drivers/pci/pci.c +++ linux-pm/drivers/pci/pci.c @@ -1438,19 +1438,25 @@ int pci_set_power_state(struct pci_dev * if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) return 0; - /* - * To put device in D3cold, we put device into D3hot in native - * way, then put device into D3cold with platform ops - */ - error = pci_set_low_power_state(dev, state > PCI_D3hot ? - PCI_D3hot : state); + if (state == PCI_D3cold) { + /* + * To put the device in D3cold, put it into D3hot in the native + * way, then put it into D3cold using platform ops. + */ + error = pci_set_low_power_state(dev, PCI_D3hot); - if (pci_platform_power_transition(dev, state)) - return error; + if (pci_platform_power_transition(dev, PCI_D3cold)) + return error; - /* Powering off a bridge may power off the whole hierarchy */ - if (state == PCI_D3cold) - pci_bus_set_current_state(dev->subordinate, PCI_D3cold); + /* Powering off a bridge may power off the whole hierarchy */ + if (dev->current_state == PCI_D3cold) + pci_bus_set_current_state(dev->subordinate, PCI_D3cold); + } else { + error = pci_set_low_power_state(dev, state); + + if (pci_platform_power_transition(dev, state)) + return error; + } return 0; }