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[PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.

Sherry Sun posted 4 patches 2 years ago
[PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
Posted by Sherry Sun 2 years ago 
Add pci host wakeup feature for imx platforms.
Example of configuring the corresponding dts property under the PCI
node:
wake-gpios = <&gpio5 21 GPIO_ACTIVE_LOW>;

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 60 +++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 74703362aeec..0cf7f21adff8 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 +1238,44 @@ 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;
+
+	/* 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 +1284,7 @@ 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 +1492,26 @@ 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, "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)
+				return dev_err_probe(dev, ret, "Failed to request host_wake_irq\n");
+
+			ret = device_init_wakeup(dev, true);
+			if (ret)
+				return dev_err_probe(dev, ret, "Failed to init host_wake_irq\n");
+		}
 	}
 
 	return 0;
@@ -1466,6 +1521,11 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
 {
 	struct imx6_pcie *imx6_pcie = platform_get_drvdata(pdev);
 
+	if (imx6_pcie->host_wake_irq >= 0) {
+		device_init_wakeup(&pdev->dev, false);
+		disable_irq(imx6_pcie->host_wake_irq);
+	}
+
 	/* bring down link, so bootloader gets clean state in case of reboot */
 	imx6_pcie_assert_core_reset(imx6_pcie);
 }
-- 
2.34.1
Re: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
Posted by kernel test robot 2 years ago 
Hi Sherry,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/next]
[also build test WARNING on pci/for-linus shawnguo/for-next robh/for-next linus/master v6.7-rc5 next-20231214]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sherry-Sun/PCI-imx6-Add-pci-host-wakeup-support-on-imx-platforms/20231213-173031
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20231213092850.1706042-2-sherry.sun%40nxp.com
patch subject: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
config: arm-randconfig-004-20231213 (https://download.01.org/0day-ci/archive/20231214/202312141726.nPrR7WDt-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231214/202312141726.nPrR7WDt-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312141726.nPrR7WDt-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/pci/controller/dwc/pci-imx6.c:1267:13: warning: no previous prototype for function 'host_wake_irq_handler' [-Wmissing-prototypes]
    1267 | irqreturn_t host_wake_irq_handler(int irq, void *priv)
         |             ^
   drivers/pci/controller/dwc/pci-imx6.c:1267:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1267 | irqreturn_t host_wake_irq_handler(int irq, void *priv)
         | ^
         | static 
   1 warning generated.


vim +/host_wake_irq_handler +1267 drivers/pci/controller/dwc/pci-imx6.c

  1266	
> 1267	irqreturn_t host_wake_irq_handler(int irq, void *priv)
  1268	{
  1269		struct imx6_pcie *imx6_pcie = priv;
  1270		struct device *dev = imx6_pcie->pci->dev;
  1271	
  1272		/* Notify PM core we are wakeup source */
  1273		pm_wakeup_event(dev, 0);
  1274		pm_system_wakeup();
  1275	
  1276		return IRQ_HANDLED;
  1277	}
  1278	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Re: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
Posted by kernel test robot 2 years ago 
Hi Sherry,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/next]
[also build test WARNING on pci/for-linus shawnguo/for-next robh/for-next linus/master v6.7-rc5 next-20231214]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sherry-Sun/PCI-imx6-Add-pci-host-wakeup-support-on-imx-platforms/20231213-173031
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20231213092850.1706042-2-sherry.sun%40nxp.com
patch subject: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
config: alpha-randconfig-r112-20231214 (https://download.01.org/0day-ci/archive/20231214/202312141719.j5GCLQry-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231214/202312141719.j5GCLQry-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312141719.j5GCLQry-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/pci/controller/dwc/pci-imx6.c:1267:13: sparse: sparse: symbol 'host_wake_irq_handler' was not declared. Should it be static?
   drivers/pci/controller/dwc/pci-imx6.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/umh.h, include/linux/kmod.h, ...):
   include/linux/page-flags.h:242:46: sparse: sparse: self-comparison always evaluates to false

vim +/host_wake_irq_handler +1267 drivers/pci/controller/dwc/pci-imx6.c

  1266	
> 1267	irqreturn_t host_wake_irq_handler(int irq, void *priv)
  1268	{
  1269		struct imx6_pcie *imx6_pcie = priv;
  1270		struct device *dev = imx6_pcie->pci->dev;
  1271	
  1272		/* Notify PM core we are wakeup source */
  1273		pm_wakeup_event(dev, 0);
  1274		pm_system_wakeup();
  1275	
  1276		return IRQ_HANDLED;
  1277	}
  1278	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Re: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
Posted by kernel test robot 2 years ago 
Hi Sherry,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/next]
[also build test WARNING on pci/for-linus shawnguo/for-next robh/for-next linus/master v6.7-rc5 next-20231213]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sherry-Sun/PCI-imx6-Add-pci-host-wakeup-support-on-imx-platforms/20231213-173031
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20231213092850.1706042-2-sherry.sun%40nxp.com
patch subject: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20231214/202312140402.hZsD0IVQ-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231214/202312140402.hZsD0IVQ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312140402.hZsD0IVQ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/pci/controller/dwc/pci-imx6.c:1267:13: warning: no previous prototype for 'host_wake_irq_handler' [-Wmissing-prototypes]
    1267 | irqreturn_t host_wake_irq_handler(int irq, void *priv)
         |             ^~~~~~~~~~~~~~~~~~~~~


vim +/host_wake_irq_handler +1267 drivers/pci/controller/dwc/pci-imx6.c

  1266	
> 1267	irqreturn_t host_wake_irq_handler(int irq, void *priv)
  1268	{
  1269		struct imx6_pcie *imx6_pcie = priv;
  1270		struct device *dev = imx6_pcie->pci->dev;
  1271	
  1272		/* Notify PM core we are wakeup source */
  1273		pm_wakeup_event(dev, 0);
  1274		pm_system_wakeup();
  1275	
  1276		return IRQ_HANDLED;
  1277	}
  1278	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Re: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
Posted by Bjorn Helgaas 2 years ago 
Drop period at the end of subject line.  It only adds the possibility
of unnecessary line wrapping in git log.

On Wed, Dec 13, 2023 at 05:28:47PM +0800, Sherry Sun wrote:
> Add pci host wakeup feature for imx platforms.

s/pci/PCI/
s/imx/i.MX/ (based on how nxp.com web pages refer to it)

> Example of configuring the corresponding dts property under the PCI
> node:
> wake-gpios = <&gpio5 21 GPIO_ACTIVE_LOW>;

Add newline between paragraphs or wrap into a single paragraph.

> +		/* host wakeup support */
> +		imx6_pcie->host_wake_irq = -1;

AFAIK, 0 is an invalid IRQ value.  So why not drop this assignment
since imx6_pcie->host_wake_irq is 0 by default since it was allocated
with devm_kzalloc(), and test like this elsewhere:

  if (imx6_pcie->host_wake_irq) {
    enable_irq_wake(imx6_pcie->host_wake_irq)

> +		host_wake_gpio = devm_gpiod_get_optional(dev, "wake", GPIOD_IN);
> +		if (IS_ERR(host_wake_gpio))
> +			return PTR_ERR(host_wake_gpio);
> +
> +		if (host_wake_gpio != NULL) {

  if (host_wake_gpio)

Bjorn
RE: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.
Posted by Sherry Sun 2 years ago 

> -----Original Message-----
> From: Bjorn Helgaas <helgaas@kernel.org>
> Sent: 2023年12月14日 3:58
> To: Sherry Sun <sherry.sun@nxp.com>
> Cc: Hongxing Zhu <hongxing.zhu@nxp.com>; l.stach@pengutronix.de;
> lpieralisi@kernel.org; kw@linux.com; robh@kernel.org;
> bhelgaas@google.com; krzysztof.kozlowski+dt@linaro.org;
> conor+dt@kernel.org; shawnguo@kernel.org; s.hauer@pengutronix.de;
> kernel@pengutronix.de; festevam@gmail.com; dl-linux-imx <linux-
> imx@nxp.com>; linux-pci@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org
> Subject: Re: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx
> platforms.
> 
> Drop period at the end of subject line.  It only adds the possibility of
> unnecessary line wrapping in git log.

Hi Bjorn, thanks for the comments, will do in V3.

> 
> On Wed, Dec 13, 2023 at 05:28:47PM +0800, Sherry Sun wrote:
> > Add pci host wakeup feature for imx platforms.
> 
> s/pci/PCI/
> s/imx/i.MX/ (based on how nxp.com web pages refer to it)
> 

Will do.

> > Example of configuring the corresponding dts property under the PCI
> > node:
> > wake-gpios = <&gpio5 21 GPIO_ACTIVE_LOW>;
> 
> Add newline between paragraphs or wrap into a single paragraph.

Will do.

> 
> > +		/* host wakeup support */
> > +		imx6_pcie->host_wake_irq = -1;
> 
> AFAIK, 0 is an invalid IRQ value.  So why not drop this assignment since
> imx6_pcie->host_wake_irq is 0 by default since it was allocated with
> devm_kzalloc(), and test like this elsewhere:
> 
>   if (imx6_pcie->host_wake_irq) {
>     enable_irq_wake(imx6_pcie->host_wake_irq)

I plan to change the host_wake_irq to unsigned int type, and add following codes, then "if (imx6_pcie->host_wake_irq)" condition seems more reasonable, let me know if you have any further suggestions. thanks!
-                       imx6_pcie->host_wake_irq = gpiod_to_irq(host_wake_gpio);
+                       ret = gpiod_to_irq(host_wake_gpio);
+                       if (ret < 0)
+                               return dev_err_probe(dev, ret, "Failed to get IRQ for WAKE gpio\n");
+
+                       imx6_pcie->host_wake_irq = (unsigned int)ret;

> 
> > +		host_wake_gpio = devm_gpiod_get_optional(dev, "wake",
> GPIOD_IN);
> > +		if (IS_ERR(host_wake_gpio))
> > +			return PTR_ERR(host_wake_gpio);
> > +
> > +		if (host_wake_gpio != NULL) {
> 
>   if (host_wake_gpio)

Will do.

Best Regards
Sherry

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