From patchwork Mon Apr 4 15:42:27 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: 12800496 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 AC440C433FE for ; Mon, 4 Apr 2022 15:42:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1378362AbiDDPof (ORCPT ); Mon, 4 Apr 2022 11:44:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55524 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347003AbiDDPoe (ORCPT ); Mon, 4 Apr 2022 11:44:34 -0400 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0831393F5; Mon, 4 Apr 2022 08:42:37 -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 663112fc46d070d8; Mon, 4 Apr 2022 17:42:36 +0200 Received: from kreacher.localnet (unknown [213.134.181.62]) (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 3F1BC66BCD3; Mon, 4 Apr 2022 17:42:35 +0200 (CEST) From: "Rafael J. Wysocki" To: Linux PCI Cc: Linux PM , LKML , Bjorn Helgaas , Mika Westerberg Subject: [PATCH v1 2/2] PCI: PM: Resume bus after putting the bridge into D0 entirely Date: Mon, 04 Apr 2022 17:42:27 +0200 Message-ID: <1807986.atdPhlSkOF@kreacher> In-Reply-To: <4198163.ejJDZkT8p0@kreacher> References: <4198163.ejJDZkT8p0@kreacher> MIME-Version: 1.0 X-CLIENT-IP: 213.134.181.62 X-CLIENT-HOSTNAME: 213.134.181.62 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvvddrudejvddgkeejucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffufffkjghfggfgtgesthfuredttddtjeenucfhrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqeenucggtffrrghtthgvrhhnpedvjeelgffhiedukedtleekkedvudfggefhgfegjefgueekjeelvefggfdvledutdenucfkphepvddufedrudefgedrudekuddriedvnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepvddufedrudefgedrudekuddriedvpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqpdhnsggprhgtphhtthhopeehpdhrtghpthhtoheplhhinhhugidqphgtihesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehhvghlghgrrghssehkvghrnhgvlhdrohhrghdprhgtphhtthhopehmihhk rgdrfigvshhtvghrsggvrhhgsehlihhnuhigrdhinhhtvghlrdgtohhm 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 It is rather counter-intuitive to attempt to resume devices on a bus segment before completing a transition of their parent bridge into D0, so do that when the transition is complete. This matters especially when the transition in question is not successful, in which case it doesn't make sense to even try to resume the child devices at all. Signed-off-by: Rafael J. Wysocki Reviewed-by: Mika Westerberg --- drivers/pci/pci.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) Index: linux-pm/drivers/pci/pci.c =================================================================== --- linux-pm.orig/drivers/pci/pci.c +++ linux-pm/drivers/pci/pci.c @@ -1310,15 +1310,24 @@ static int pci_dev_wait(struct pci_dev * int pci_power_up(struct pci_dev *dev) { pci_power_t old_state = dev->current_state; + int ret; pci_platform_power_transition(dev, PCI_D0); + /* + * For transitions from D3hot or deeper (including unknown), force + * PCI_PM_CTRL register write, D3*->D0 transition delay and BARS + * restoration. + */ + if (old_state >= PCI_D3hot) + dev->current_state = PCI_D3hot; + ret = pci_raw_set_power_state(dev, PCI_D0); /* * Mandatory power management transition delays are handled in * pci_pm_resume_noirq() and pci_pm_runtime_resume() of the * corresponding bridge. */ - if (dev->runtime_d3cold) { + if (!ret && dev->runtime_d3cold) { /* * When powering on a bridge from D3cold, the whole hierarchy * may be powered on into D0uninitialized state, resume them to @@ -1327,15 +1336,7 @@ int pci_power_up(struct pci_dev *dev) pci_resume_bus(dev->subordinate); } - /* - * For transitions from D3hot or deeper and initial power-up, force - * PCI_PM_CTRL register write, D3*->D0 transition delay and BARS - * restoration. - */ - if (old_state >= PCI_D3hot) - dev->current_state = PCI_D3hot; - - return pci_raw_set_power_state(dev, PCI_D0); + return ret; } /**