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Thu, 10 Sep 2020 11:50:46 -0700 (PDT) X-Gm-Message-State: AOAM532N93HChZj4UFkt63vpYBKNetVJDJZLlIzYte/yye5CZgmPZXWs d9nde6FOuXpCOpLsQV4Yw/Af1sGyQb7CW6UWWw== X-Google-Smtp-Source: ABdhPJxId/3nNZbBGqZxSbJuxtyRdyh2ZW5+MJHU0lYZCDw8GvbX0pkcX7nJAy2HYsIcmimVL93DTH8UyT5yVJErc2E= X-Received: by 2002:a9d:411:: with SMTP id 17mr4977165otc.192.1599763845337; Thu, 10 Sep 2020 11:50:45 -0700 (PDT) MIME-Version: 1.0 References: <20200824193036.6033-1-james.quinlan@broadcom.com> <20200824193036.6033-5-james.quinlan@broadcom.com> <20200910155637.GA423872@bogus> In-Reply-To: From: Rob Herring Date: Thu, 10 Sep 2020 12:50:34 -0600 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v11 04/11] PCI: brcmstb: Add suspend and resume pm_ops To: Jim Quinlan X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200910_145047_130740_258250F5 X-CRM114-Status: GOOD ( 26.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , Lorenzo Pieralisi , "open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" , open list , Florian Fainelli , "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , Bjorn Helgaas , Robin Murphy , Christoph Hellwig , Nicolas Saenz Julienne Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Sep 10, 2020 at 10:42 AM Jim Quinlan wrote: > > On Thu, Sep 10, 2020 at 11:56 AM Rob Herring wrote: > > > > On Mon, Aug 24, 2020 at 03:30:17PM -0400, Jim Quinlan wrote: > > > From: Jim Quinlan > > > > > > Broadcom Set-top (BrcmSTB) boards typically support S2, S3, and S5 suspend > > > and resume. Now the PCIe driver may do so as well. > > > > > > Signed-off-by: Jim Quinlan > > > Acked-by: Florian Fainelli > > > --- > > > drivers/pci/controller/pcie-brcmstb.c | 47 +++++++++++++++++++++++++++ > > > 1 file changed, 47 insertions(+) > > > > > > diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c > > > index c2b3d2946a36..3d588ab7a6dd 100644 > > > --- a/drivers/pci/controller/pcie-brcmstb.c > > > +++ b/drivers/pci/controller/pcie-brcmstb.c > > > @@ -978,6 +978,47 @@ static void brcm_pcie_turn_off(struct brcm_pcie *pcie) > > > brcm_pcie_bridge_sw_init_set(pcie, 1); > > > } > > > > > > +static int brcm_pcie_suspend(struct device *dev) > > > +{ > > > + struct brcm_pcie *pcie = dev_get_drvdata(dev); > > > + > > > + brcm_pcie_turn_off(pcie); > > > + clk_disable_unprepare(pcie->clk); > > > + > > > + return 0; > > > +} > > > + > > > +static int brcm_pcie_resume(struct device *dev) > > > +{ > > > + struct brcm_pcie *pcie = dev_get_drvdata(dev); > > > + void __iomem *base; > > > + u32 tmp; > > > + int ret; > > > + > > > + base = pcie->base; > > > + clk_prepare_enable(pcie->clk); > > > + > > > + /* Take bridge out of reset so we can access the SERDES reg */ > > > + brcm_pcie_bridge_sw_init_set(pcie, 0); > > > + > > > + /* SERDES_IDDQ = 0 */ > > > + tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG); > > > + u32p_replace_bits(&tmp, 0, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK); > > > + writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG); > > > + > > > + /* wait for serdes to be stable */ > > > + udelay(100); > > > > Really needs to be a spinloop? > > > > > + > > > + ret = brcm_pcie_setup(pcie); > > > + if (ret) > > > + return ret; > > > + > > > + if (pcie->msi) > > > + brcm_msi_set_regs(pcie->msi); > > > + > > > + return 0; > > > +} > > > + > > > static void __brcm_pcie_remove(struct brcm_pcie *pcie) > > > { > > > brcm_msi_remove(pcie); > > > @@ -1087,12 +1128,18 @@ static int brcm_pcie_probe(struct platform_device *pdev) > > > > > > MODULE_DEVICE_TABLE(of, brcm_pcie_match); > > > > > > +static const struct dev_pm_ops brcm_pcie_pm_ops = { > > > + .suspend_noirq = brcm_pcie_suspend, > > > + .resume_noirq = brcm_pcie_resume, > > > > Why do you need interrupts disabled? There's 39 cases of .suspend_noirq > > and 1352 of .suspend in the tree. > > I will test switching this to suspend_late/resume_early. Why not just the 'regular' flavor suspend/resume? Rob _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel