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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7CD1CA9EA1 for ; Fri, 18 Oct 2019 08:18:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8B8F321925 for ; Fri, 18 Oct 2019 08:18:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2442215AbfJRISQ (ORCPT ); Fri, 18 Oct 2019 04:18:16 -0400 Received: from mx2.suse.de ([195.135.220.15]:40810 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2442192AbfJRISQ (ORCPT ); Fri, 18 Oct 2019 04:18:16 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 3F37BB445; Fri, 18 Oct 2019 08:18:14 +0000 (UTC) Date: Fri, 18 Oct 2019 10:18:14 +0200 Message-ID: From: Takashi Iwai To: Kai-Heng Feng Cc: , , , Subject: Re: [PATCH v6 1/2] PCI: Add a helper to check Power Resource Requirements _PR3 existence In-Reply-To: <20191018073848.14590-1-kai.heng.feng@canonical.com> References: <20191018073848.14590-1-kai.heng.feng@canonical.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 18 Oct 2019 09:38:47 +0200, Kai-Heng Feng wrote: > > A driver may want to know the existence of _PR3, to choose different > runtime suspend behavior. A user will be add in next patch. > > This is mostly the same as nouveau_pr3_present(). > > Reported-by: kbuild test robot It's confusing -- this particular change isn't reported by the test bot, but only about the lack of the CONFIG_ACPI ifdef. thanks, Takashi > Signed-off-by: Kai-Heng Feng > --- > v6: > - Only define the function when CONFIG_ACPI is set. > v5: > - Add wording suggestion from Bjorn. > v4: > - Let caller to find its upstream port device. > > drivers/pci/pci.c | 18 ++++++++++++++++++ > include/linux/pci.h | 2 ++ > 2 files changed, 20 insertions(+) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index e7982af9a5d8..1df99d9e350e 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -5856,6 +5856,24 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode, > return 0; > } > > +#ifdef CONFIG_ACPI > +bool pci_pr3_present(struct pci_dev *pdev) > +{ > + struct acpi_device *adev; > + > + if (acpi_disabled) > + return false; > + > + adev = ACPI_COMPANION(&pdev->dev); > + if (!adev) > + return false; > + > + return adev->power.flags.power_resources && > + acpi_has_method(adev->handle, "_PR3"); > +} > +EXPORT_SYMBOL_GPL(pci_pr3_present); > +#endif > + > /** > * pci_add_dma_alias - Add a DMA devfn alias for a device > * @dev: the PCI device for which alias is added > diff --git a/include/linux/pci.h b/include/linux/pci.h > index f9088c89a534..1d15c5d49cdd 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -2310,9 +2310,11 @@ struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus); > > void > pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *)); > +bool pci_pr3_present(struct pci_dev *pdev); > #else > static inline struct irq_domain * > pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; } > +static bool pci_pr3_present(struct pci_dev *pdev) { return false; } > #endif > > #ifdef CONFIG_EEH > -- > 2.17.1 >