From patchwork Mon Apr 11 14:33:02 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: 12809222 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 58DFEC433EF for ; Mon, 11 Apr 2022 14:34:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347316AbiDKOgS (ORCPT ); Mon, 11 Apr 2022 10:36:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347323AbiDKOgQ (ORCPT ); Mon, 11 Apr 2022 10:36:16 -0400 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6151622F; Mon, 11 Apr 2022 07:34:01 -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 ff377b1e03ebb21c; Mon, 11 Apr 2022 16:33:59 +0200 Received: from kreacher.localnet (unknown [213.134.175.113]) (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 6136366BDED; Mon, 11 Apr 2022 16:33:58 +0200 (CEST) From: "Rafael J. Wysocki" To: Linux PCI Cc: Linux PM , LKML , Bjorn Helgaas , Mika Westerberg Subject: [PATCH v2 9/9] PCI/PM: Replace pci_set_power_state() in pci_pm_thaw_noirq() Date: Mon, 11 Apr 2022 16:33:02 +0200 Message-ID: <5729914.MhkbZ0Pkbq@kreacher> In-Reply-To: <11975904.O9o76ZdvQC@kreacher> References: <4419002.LvFx2qVVIh@kreacher> <11975904.O9o76ZdvQC@kreacher> MIME-Version: 1.0 X-CLIENT-IP: 213.134.175.113 X-CLIENT-HOSTNAME: 213.134.175.113 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvvddrudekiedgjeekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffufffkjghfggfgtgesthfuredttddtjeenucfhrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqeenucggtffrrghtthgvrhhnpedvjeelgffhiedukedtleekkedvudfggefhgfegjefgueekjeelvefggfdvledutdenucfkphepvddufedrudefgedrudejhedruddufeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpedvudefrddufeegrddujeehrdduudefpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqpdhnsggprhgtphhtthhopeehpdhrtghpthhtoheplhhinhhugidqphgtihesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehhvghlghgrrghssehkvghrnhgvlhdrohhrghdprhgtphhtthhopehm ihhkrgdrfigvshhtvghrsggvrhhgsehlihhnuhigrdhinhhtvghlrdgtohhm 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 Calling pci_set_power_state() to put the given device into D0 in pci_pm_thaw_noirq() may cause it to restore the device's BARs, which is redundant before calling pci_restore_state(), so replace it with a direct pci_power_up() call followed by pci_update_current_state() if it returns a nonzeor value, in analogy with pci_pm_default_resume_early(). Avoid code duplication by introducing a wrapper function to contain the repeating pattern and calling it in both places. Signed-off-by: Rafael J. Wysocki --- New patch in v2. --- drivers/pci/pci-driver.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) Index: linux-pm/drivers/pci/pci-driver.c =================================================================== --- linux-pm.orig/drivers/pci/pci-driver.c +++ linux-pm/drivers/pci/pci-driver.c @@ -551,11 +551,15 @@ static void pci_pm_default_resume(struct pci_enable_wake(pci_dev, PCI_D0, false); } -static void pci_pm_default_resume_early(struct pci_dev *pci_dev) +static void pci_pm_power_up_and_verify_state(struct pci_dev *pci_dev) { if (pci_power_up(pci_dev)) pci_update_current_state(pci_dev, PCI_D0); +} +static void pci_pm_default_resume_early(struct pci_dev *pci_dev) +{ + pci_pm_power_up_and_verify_state(pci_dev); pci_restore_state(pci_dev); pci_pme_restore(pci_dev); } @@ -1080,7 +1084,7 @@ static int pci_pm_thaw_noirq(struct devi * in case the driver's "freeze" callbacks put it into a low-power * state. */ - pci_set_power_state(pci_dev, PCI_D0); + pci_pm_power_up_and_verify_state(pci_dev); pci_restore_state(pci_dev); if (pci_has_legacy_pm_support(pci_dev))