From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: Message-ID: <1527752260.28160.3.camel@mhfsdcap03> Subject: Re: [PATCH] PCI: mediatek: Add system pm support for MT2712 From: Honghui Zhang To: Bjorn Helgaas Date: Thu, 31 May 2018 15:37:40 +0800 In-Reply-To: <20180531042020.GQ39853@bhelgaas-glaptop.roam.corp.google.com> References: <1527647736-19986-1-git-send-email-honghui.zhang@mediatek.com> <20180531042020.GQ39853@bhelgaas-glaptop.roam.corp.google.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org, hongkun.cao@mediatek.com, lorenzo.pieralisi@arm.com, marc.zyngier@arm.com, linux-pci@vger.kernel.org, sean.wang@mediatek.com, yong.wu@mediatek.com, linux-kernel@vger.kernel.org, yt.shen@mediatek.com, matthias.bgg@gmail.com, ryder.lee@mediatek.com, linux-mediatek@lists.infradead.org, xinping.qian@mediatek.com, bhelgaas@google.com, yingjoe.chen@mediatek.com, eddie.huang@mediatek.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+bjorn=helgaas.com@lists.infradead.org List-ID: On Wed, 2018-05-30 at 23:20 -0500, Bjorn Helgaas wrote: > On Wed, May 30, 2018 at 10:35:36AM +0800, honghui.zhang@mediatek.com wrote: > > From: Honghui Zhang > > > > The MTCMOS of PCIe Host for MT2712 will be off when system suspend, and all > > the internel control register will be reset after system resume. The PCIe > > link should be re-established and the related control register values should > > be re-set after system resume. > > > > Signed-off-by: Honghui Zhang > > CC: Ryder Lee > > --- > > drivers/pci/host/pcie-mediatek.c | 82 ++++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 82 insertions(+) > > > > diff --git a/drivers/pci/host/pcie-mediatek.c b/drivers/pci/host/pcie-mediatek.c > > index dabf1086..60f98d92 100644 > > --- a/drivers/pci/host/pcie-mediatek.c > > +++ b/drivers/pci/host/pcie-mediatek.c > > @@ -132,12 +132,14 @@ struct mtk_pcie_port; > > /** > > * struct mtk_pcie_soc - differentiate between host generations > > * @need_fix_class_id: whether this host's class ID needed to be fixed or not > > + * @pm_support: whether the host's MTCMOS will be off when suspend > > * @ops: pointer to configuration access functions > > * @startup: pointer to controller setting functions > > * @setup_irq: pointer to initialize IRQ functions > > */ > > struct mtk_pcie_soc { > > bool need_fix_class_id; > > + bool pm_support; > > struct pci_ops *ops; > > int (*startup)(struct mtk_pcie_port *port); > > int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node); > > @@ -1179,12 +1181,91 @@ static int mtk_pcie_probe(struct platform_device *pdev) > > return err; > > } > > > > +static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev) > > +{ > > + struct platform_device *pdev; > > + struct mtk_pcie *pcie; > > + struct mtk_pcie_port *port; > > + const struct mtk_pcie_soc *soc; > > + > > + pdev = to_platform_device(dev); > > + pcie = platform_get_drvdata(pdev); > > + soc = pcie->soc; > > + if (!soc->pm_support) > > + return 0; > > + > > + list_for_each_entry(port, &pcie->ports, list) { > > + clk_disable_unprepare(port->ahb_ck); > > + clk_disable_unprepare(port->sys_ck); > > + phy_power_off(port->phy); > > + } > > + > > + return 0; > > +} > > + > > +static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev) > > I don't really like the __maybe_unused annotations. Looking at the > other users of SET_NOIRQ_SYSTEM_SLEEP_PM_OPS, I think a small majority > of them wrap the function definitions in #ifdef CONFIG_PM_SLEEP > instead of using __maybe_unused. That's also a bit ugly, but has the > advantage of truly omitting the definitions when they're not needed. Ok, I will follow your advise in the next version. thanks. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel