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Date: Mon, 11 Dec 2023 10:18:11 +0000
From: Sherry Sun <sherry.sun@....com>
To: Lucas Stach <l.stach@...gutronix.de>,
Hongxing Zhu <hongxing.zhu@....com>,
"lpieralisi@...nel.org" <lpieralisi@...nel.org>,
"kw@...ux.com" <kw@...ux.com>, "robh@...nel.org" <robh@...nel.org>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"krzysztof.kozlowski+dt@...aro.org"
<krzysztof.kozlowski+dt@...aro.org>,
"conor+dt@...nel.org" <conor+dt@...nel.org>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>
CC: dl-linux-imx <linux-imx@....com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/4] PCI: imx6: Add pci host wakeup support on imx
platforms.
> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: 2023年12月8日 18:16
> To: Sherry Sun <sherry.sun@....com>; Hongxing Zhu
> <hongxing.zhu@....com>; lpieralisi@...nel.org; kw@...ux.com;
> robh@...nel.org; bhelgaas@...gle.com; krzysztof.kozlowski+dt@...aro.org;
> conor+dt@...nel.org; shawnguo@...nel.org; s.hauer@...gutronix.de;
> kernel@...gutronix.de; festevam@...il.com
> Cc: dl-linux-imx <linux-imx@....com>; linux-pci@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH 1/4] PCI: imx6: Add pci host wakeup support on imx
> platforms.
>
> Am Freitag, dem 08.12.2023 um 17:13 +0800 schrieb Sherry Sun:
> > Add pci host wakeup feature for imx platforms.
> > Example of configuring the corresponding dts property under the PCI
> > node:
> > host-wake-gpio = <&gpio5 21 GPIO_ACTIVE_LOW>;
> >
> > Signed-off-by: Sherry Sun <sherry.sun@....com>
> > Reviewed-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> > drivers/pci/controller/dwc/pci-imx6.c | 69
> > +++++++++++++++++++++++++++
> > 1 file changed, 69 insertions(+)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 74703362aeec..050c9140f4a3 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -72,6 +72,7 @@ struct imx6_pcie_drvdata { struct imx6_pcie {
> > struct dw_pcie *pci;
> > int reset_gpio;
> > + int host_wake_irq;
> > bool gpio_active_high;
> > bool link_is_up;
> > struct clk *pcie_bus;
> > @@ -1237,11 +1238,46 @@ static int imx6_pcie_resume_noirq(struct
> device *dev)
> > return 0;
> > }
> >
> > +static int imx6_pcie_suspend(struct device *dev) {
> > + struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
> > +
> > + if (imx6_pcie->host_wake_irq >= 0)
> > + enable_irq_wake(imx6_pcie->host_wake_irq);
> > +
> > + return 0;
> > +}
> > +
> > +static int imx6_pcie_resume(struct device *dev) {
> > + struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
> > +
> > + if (imx6_pcie->host_wake_irq >= 0)
> > + disable_irq_wake(imx6_pcie->host_wake_irq);
> > +
> > + return 0;
> > +}
> > +
> > static const struct dev_pm_ops imx6_pcie_pm_ops = {
> > NOIRQ_SYSTEM_SLEEP_PM_OPS(imx6_pcie_suspend_noirq,
> > imx6_pcie_resume_noirq)
> > + SYSTEM_SLEEP_PM_OPS(imx6_pcie_suspend, imx6_pcie_resume)
> > };
> >
> > +irqreturn_t host_wake_irq_handler(int irq, void *priv) {
> > + struct imx6_pcie *imx6_pcie = priv;
> > + struct device *dev = imx6_pcie->pci->dev;
> > +
> > + dev_dbg(dev, "%s: host wakeup by pcie", __func__);
> > +
> Not sure how much value this debug print carries. If you want to keep it,
> drop the __func__. There is no other place in this driver handling the wakeup,
> so the function name in the print is pure noise.
Ok, will remove the debug print info here.
>
> > + /* Notify PM core we are wakeup source */
> > + pm_wakeup_event(dev, 0);
> > + pm_system_wakeup();
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > static int imx6_pcie_probe(struct platform_device *pdev) {
> > struct device *dev = &pdev->dev;
> > @@ -1250,6 +1286,7 @@ static int imx6_pcie_probe(struct
> platform_device *pdev)
> > struct device_node *np;
> > struct resource *dbi_base;
> > struct device_node *node = dev->of_node;
> > + struct gpio_desc *host_wake_gpio;
> > int ret;
> > u16 val;
> >
> > @@ -1457,6 +1494,32 @@ static int imx6_pcie_probe(struct
> platform_device *pdev)
> > val |= PCI_MSI_FLAGS_ENABLE;
> > dw_pcie_writew_dbi(pci, offset + PCI_MSI_FLAGS,
> val);
> > }
> > +
> > + /* host wakeup support */
> > + imx6_pcie->host_wake_irq = -1;
> > + host_wake_gpio = devm_gpiod_get_optional(dev, "host-
> wake", GPIOD_IN);
> > + if (IS_ERR(host_wake_gpio))
> > + return PTR_ERR(host_wake_gpio);
> > +
> > + if (host_wake_gpio != NULL) {
> > + imx6_pcie->host_wake_irq =
> gpiod_to_irq(host_wake_gpio);
> > + ret = devm_request_threaded_irq(dev, imx6_pcie-
> >host_wake_irq, NULL,
> > +
> host_wake_irq_handler,
> > + IRQF_ONESHOT |
> IRQF_TRIGGER_FALLING,
> > + "host_wake",
> imx6_pcie);
> > + if (ret) {
> > + dev_err(dev, "Failed to request
> host_wake_irq %d (%d)\n",
> > + imx6_pcie->host_wake_irq, ret);
> > + imx6_pcie->host_wake_irq = -1;
>
> What's the point of resetting host_wake_irq to -1 in those error paths?
> Nobody is going to access this member anymore after the error. Just drop
> this.
>
> You could simplify all those error paths to if (err)
> return dev_err_probe(...);
Sounds reasonable, I will remove the host_wake_irq resetting here and use dev_err_probe() instead, thanks!
Best Regards
Sherry
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