1. Patchew
  2. linux
  3. View series

[PATCH v6] gpio: bt8xx: use generic power management

Vaibhav Gupta posted 1 patch 3 months, 3 weeks ago 
drivers/gpio/gpio-bt8xx.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
[PATCH v6] gpio: bt8xx: use generic power management
Posted by Vaibhav Gupta 3 months, 3 weeks ago 
Switch to the generic PCI power management framework and remove legacy
callbacks like .suspend() and .resume(). With the generic framework, the
standard PCI related work like:
	- pci_save/restore_state()
	- pci_enable/disable_device()
	- pci_set_power_state()
is handled by the PCI core and this driver should implement only gpio-bt8xx
specific operations in its respective callback functions.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/gpio/gpio-bt8xx.c | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)

diff --git a/drivers/gpio/gpio-bt8xx.c b/drivers/gpio/gpio-bt8xx.c
index 05401da03ca3..324eeb77dbd5 100644
--- a/drivers/gpio/gpio-bt8xx.c
+++ b/drivers/gpio/gpio-bt8xx.c
@@ -52,10 +52,8 @@ struct bt8xxgpio {
 	struct pci_dev *pdev;
 	struct gpio_chip gpio;
 
-#ifdef CONFIG_PM
 	u32 saved_outen;
 	u32 saved_data;
-#endif
 };
 
 #define bgwrite(dat, adr)	writel((dat), bg->mmio+(adr))
@@ -224,9 +222,10 @@ static void bt8xxgpio_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
-#ifdef CONFIG_PM
-static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
+
+static int bt8xxgpio_suspend(struct device *dev)
 {
+	struct pci_dev *pdev = to_pci_dev(dev);
 	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
 
 	scoped_guard(spinlock_irqsave, &bg->lock) {
@@ -238,23 +237,13 @@ static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state)
 		bgwrite(0x0, BT848_GPIO_OUT_EN);
 	}
 
-	pci_save_state(pdev);
-	pci_disable_device(pdev);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
-
 	return 0;
 }
 
-static int bt8xxgpio_resume(struct pci_dev *pdev)
+static int bt8xxgpio_resume(struct device *dev)
 {
+	struct pci_dev *pdev = to_pci_dev(dev);
 	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
-	int err;
-
-	pci_set_power_state(pdev, PCI_D0);
-	err = pci_enable_device(pdev);
-	if (err)
-		return err;
-	pci_restore_state(pdev);
 
 	guard(spinlock_irqsave)(&bg->lock);
 
@@ -267,10 +256,8 @@ static int bt8xxgpio_resume(struct pci_dev *pdev)
 
 	return 0;
 }
-#else
-#define bt8xxgpio_suspend NULL
-#define bt8xxgpio_resume NULL
-#endif /* CONFIG_PM */
+
+static DEFINE_SIMPLE_DEV_PM_OPS(bt8xxgpio_pm_ops, bt8xxgpio_suspend, bt8xxgpio_resume);
 
 static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
@@ -286,8 +273,7 @@ static struct pci_driver bt8xxgpio_pci_driver = {
 	.id_table	= bt8xxgpio_pci_tbl,
 	.probe		= bt8xxgpio_probe,
 	.remove		= bt8xxgpio_remove,
-	.suspend	= bt8xxgpio_suspend,
-	.resume		= bt8xxgpio_resume,
+	.driver.pm	= &bt8xxgpio_pm_ops,
 };
 
 module_pci_driver(bt8xxgpio_pci_driver);
-- 
2.51.0
Re: [PATCH v6] gpio: bt8xx: use generic power management
Posted by Bartosz Golaszewski 3 months, 2 weeks ago 
From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>


On Thu, 16 Oct 2025 16:36:13 +0000, Vaibhav Gupta wrote:
> Switch to the generic PCI power management framework and remove legacy
> callbacks like .suspend() and .resume(). With the generic framework, the
> standard PCI related work like:
> 	- pci_save/restore_state()
> 	- pci_enable/disable_device()
> 	- pci_set_power_state()
> is handled by the PCI core and this driver should implement only gpio-bt8xx
> specific operations in its respective callback functions.
> 
> [...]

Applied, thanks!

[1/1] gpio: bt8xx: use generic power management
      https://git.kernel.org/brgl/linux/c/d5376026f9269601e239545e2ec4aea0cc62bf2a

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Re: [PATCH v6] gpio: bt8xx: use generic power management
Posted by Bartosz Golaszewski 3 months, 2 weeks ago 
On Thu, Oct 16, 2025 at 6:36 PM Vaibhav Gupta <vaibhavgupta40@gmail.com> wrote:
>
> Switch to the generic PCI power management framework and remove legacy
> callbacks like .suspend() and .resume(). With the generic framework, the
> standard PCI related work like:
>         - pci_save/restore_state()
>         - pci_enable/disable_device()
>         - pci_set_power_state()
> is handled by the PCI core and this driver should implement only gpio-bt8xx
> specific operations in its respective callback functions.
>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
> ---

This says it's a v6 but I have no idea what changed since v1. Please
provide a changelog for every version when submitting patches.

Bjorn: does this look good to you?

Bartosz
Re: [PATCH v6] gpio: bt8xx: use generic power management
Posted by Bjorn Helgaas 3 months, 2 weeks ago 
On Tue, Oct 21, 2025 at 10:48:48AM +0200, Bartosz Golaszewski wrote:
> On Thu, Oct 16, 2025 at 6:36 PM Vaibhav Gupta <vaibhavgupta40@gmail.com> wrote:
> >
> > Switch to the generic PCI power management framework and remove legacy
> > callbacks like .suspend() and .resume(). With the generic framework, the
> > standard PCI related work like:
> >         - pci_save/restore_state()
> >         - pci_enable/disable_device()
> >         - pci_set_power_state()
> > is handled by the PCI core and this driver should implement only gpio-bt8xx
> > specific operations in its respective callback functions.
> >
> > Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
> > ---
> 
> This says it's a v6 but I have no idea what changed since v1. Please
> provide a changelog for every version when submitting patches.
> 
> Bjorn: does this look good to you?

Yes, it looks good to me.

Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>

FWIW, here's the diff from v1 to v6.  Mostly just iterating on
compile warning nits:

diff --git a/drivers/gpio/gpio-bt8xx.c b/drivers/gpio/gpio-bt8xx.c
index e8d0c67bb618..324eeb77dbd5 100644
--- a/drivers/gpio/gpio-bt8xx.c
+++ b/drivers/gpio/gpio-bt8xx.c
@@ -52,10 +52,8 @@ struct bt8xxgpio {
 	struct pci_dev *pdev;
 	struct gpio_chip gpio;
 
-#ifdef CONFIG_PM
 	u32 saved_outen;
 	u32 saved_data;
-#endif
 };
 
 #define bgwrite(dat, adr)	writel((dat), bg->mmio+(adr))
@@ -224,7 +222,8 @@ static void bt8xxgpio_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
-static int __maybe_unused bt8xxgpio_suspend(struct device *dev)
+
+static int bt8xxgpio_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
@@ -241,7 +240,7 @@ static int __maybe_unused bt8xxgpio_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused bt8xxgpio_resume(struct device *dev)
+static int bt8xxgpio_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
@@ -258,7 +257,7 @@ static int __maybe_unused bt8xxgpio_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(bt8xxgpio_pm_ops, bt8xxgpio_suspend, bt8xxgpio_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(bt8xxgpio_pm_ops, bt8xxgpio_suspend, bt8xxgpio_resume);
 
 static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
Re: [PATCH v6] gpio: bt8xx: use generic power management
Posted by Vaibhav Gupta 3 months, 2 weeks ago 
> > 
> > This says it's a v6 but I have no idea what changed since v1. Please
> > provide a changelog for every version when submitting patches.
> > 
> > Bjorn: does this look good to you?
> 
> Yes, it looks good to me.
> 
> Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
> 
> FWIW, here's the diff from v1 to v6.  Mostly just iterating on
> compile warning nits:
> 
> diff --git a/drivers/gpio/gpio-bt8xx.c b/drivers/gpio/gpio-bt8xx.c
> index e8d0c67bb618..324eeb77dbd5 100644
> --- a/drivers/gpio/gpio-bt8xx.c
> +++ b/drivers/gpio/gpio-bt8xx.c
> @@ -52,10 +52,8 @@ struct bt8xxgpio {
>  	struct pci_dev *pdev;
>  	struct gpio_chip gpio;
>  
> -#ifdef CONFIG_PM
>  	u32 saved_outen;
>  	u32 saved_data;
> -#endif
>  };
>  
>  #define bgwrite(dat, adr)	writel((dat), bg->mmio+(adr))
> @@ -224,7 +222,8 @@ static void bt8xxgpio_remove(struct pci_dev *pdev)
>  	pci_disable_device(pdev);
>  }
>  
> -static int __maybe_unused bt8xxgpio_suspend(struct device *dev)
> +
> +static int bt8xxgpio_suspend(struct device *dev)
>  {
>  	struct pci_dev *pdev = to_pci_dev(dev);
>  	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
> @@ -241,7 +240,7 @@ static int __maybe_unused bt8xxgpio_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int __maybe_unused bt8xxgpio_resume(struct device *dev)
> +static int bt8xxgpio_resume(struct device *dev)
>  {
>  	struct pci_dev *pdev = to_pci_dev(dev);
>  	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
> @@ -258,7 +257,7 @@ static int __maybe_unused bt8xxgpio_resume(struct device *dev)
>  	return 0;
>  }
>  
> -static SIMPLE_DEV_PM_OPS(bt8xxgpio_pm_ops, bt8xxgpio_suspend, bt8xxgpio_resume);
> +static DEFINE_SIMPLE_DEV_PM_OPS(bt8xxgpio_pm_ops, bt8xxgpio_suspend, bt8xxgpio_resume);
>  
>  static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },

Hello Bjorn!
Thanks for the review and mentioning the diff between v1 and v6.

Hey Randy!
Please let me know if the diff mentioned by Bjorn is enough or should I send a
new patch-mail describing the v1-v6 diff?

Best regards,
Vaibhav
Re: [PATCH v6] gpio: bt8xx: use generic power management
Posted by Bartosz Golaszewski 3 months, 2 weeks ago 
On Thu, Oct 23, 2025 at 9:49 AM Vaibhav Gupta <vaibhavgupta40@gmail.com> wrote:
>
> Hello Bjorn!
> Thanks for the review and mentioning the diff between v1 and v6.
>
> Hey Randy!
> Please let me know if the diff mentioned by Bjorn is enough or should I send a
> new patch-mail describing the v1-v6 diff?
>

Yes, it's enough, I could have looked it up myself but I shouldn't
have to. Please, next time just list changes under each new iteration.
Preferably just use b4, it helps with version management.

Bart
Re: [PATCH v6] gpio: bt8xx: use generic power management
Posted by Vaibhav Gupta 3 months, 2 weeks ago 
On Thu, Oct 23, 2025 at 09:55:39AM +0200, Bartosz Golaszewski wrote:
> On Thu, Oct 23, 2025 at 9:49 AM Vaibhav Gupta <vaibhavgupta40@gmail.com> wrote:
> >
> > Hello Bjorn!
> > Thanks for the review and mentioning the diff between v1 and v6.
> >
> > Hey Randy!
> > Please let me know if the diff mentioned by Bjorn is enough or should I send a
> > new patch-mail describing the v1-v6 diff?
> >
> 
> Yes, it's enough, I could have looked it up myself but I shouldn't
> have to. Please, next time just list changes under each new iteration.
> Preferably just use b4, it helps with version management.
> 
> Bart

Noted. My patches will be more clear from next time. Thanks for the reviews and
comments.

- Vaibhav

Patchew 2.1-devel-b67e4c2

© 2016 - 2026 Red Hat, Inc.