diff mbox series

[07/11] PCI: aardvark: Add suspend to RAM support

Message ID 20220818135140.5996-8-kabel@kernel.org
State New
Headers show
Series PCI: aardvark controller changes BATCH 6 | expand

Commit Message

Marek Behún Aug. 18, 2022, 1:51 p.m. UTC 
From: Miquel Raynal <miquel.raynal@bootlin.com>

Add suspend and resume callbacks. We need to use the NOIRQ variants to
ensure the controller's IRQ handlers are not run during suspend() /
resume(), which could cause races.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
---
Changes since batch 5:
- clarified commit message
- changed to new macro NOIRQ_SYSTEM_SLEEP_PM_OPS, as was done for many
  PCI controller drivers with commit 19b7858c3357 ("PCI: Convert to new
  *_PM_OPS macros")
---
 drivers/pci/controller/pci-aardvark.c | 34 +++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

Comments

Lorenzo Pieralisi Sept. 9, 2022, 10:33 a.m. UTC | #1 
On Thu, Aug 18, 2022 at 03:51:36PM +0200, Marek Behún wrote:
> From: Miquel Raynal <miquel.raynal@bootlin.com>
> 
> Add suspend and resume callbacks. We need to use the NOIRQ variants to
> ensure the controller's IRQ handlers are not run during suspend() /
> resume(), which could cause races.

Be more explicit please, which races, which IRQ handlers. This is useful
information for future testers/reviewers in case something has to be
changed, thanks.

Lorenzo

> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> Signed-off-by: Pali Rohár <pali@kernel.org>
> Signed-off-by: Marek Behún <kabel@kernel.org>
> ---
> Changes since batch 5:
> - clarified commit message
> - changed to new macro NOIRQ_SYSTEM_SLEEP_PM_OPS, as was done for many
>   PCI controller drivers with commit 19b7858c3357 ("PCI: Convert to new
>   *_PM_OPS macros")
> ---
>  drivers/pci/controller/pci-aardvark.c | 34 +++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
> index 3beafc893969..e30a33a4ecc6 100644
> --- a/drivers/pci/controller/pci-aardvark.c
> +++ b/drivers/pci/controller/pci-aardvark.c
> @@ -1890,6 +1890,39 @@ static int advk_pcie_setup_phy(struct advk_pcie *pcie)
>  	return ret;
>  }
>  
> +static int advk_pcie_suspend(struct device *dev)
> +{
> +	struct advk_pcie *pcie = dev_get_drvdata(dev);
> +
> +	advk_pcie_disable_phy(pcie);
> +
> +	clk_disable_unprepare(pcie->clk);
> +
> +	return 0;
> +}
> +
> +static int advk_pcie_resume(struct device *dev)
> +{
> +	struct advk_pcie *pcie = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = clk_prepare_enable(pcie->clk);
> +	if (ret)
> +		return ret;
> +
> +	ret = advk_pcie_enable_phy(pcie);
> +	if (ret)
> +		return ret;
> +
> +	advk_pcie_setup_hw(pcie);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops advk_pcie_dev_pm_ops = {
> +	NOIRQ_SYSTEM_SLEEP_PM_OPS(advk_pcie_suspend, advk_pcie_resume)
> +};
> +
>  static int advk_pcie_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -2167,6 +2200,7 @@ static struct platform_driver advk_pcie_driver = {
>  	.driver = {
>  		.name = "advk-pcie",
>  		.of_match_table = advk_pcie_of_match_table,
> +		.pm = &advk_pcie_dev_pm_ops,
>  	},
>  	.probe = advk_pcie_probe,
>  	.remove = advk_pcie_remove,
> -- 
> 2.35.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Lorenzo Pieralisi Sept. 27, 2022, 8:30 a.m. UTC | #2 
On Fri, Sep 09, 2022 at 12:33:01PM +0200, Lorenzo Pieralisi wrote:
> On Thu, Aug 18, 2022 at 03:51:36PM +0200, Marek Behún wrote:
> > From: Miquel Raynal <miquel.raynal@bootlin.com>
> > 
> > Add suspend and resume callbacks. We need to use the NOIRQ variants to
> > ensure the controller's IRQ handlers are not run during suspend() /
> > resume(), which could cause races.
> 
> Be more explicit please, which races, which IRQ handlers. This is useful
> information for future testers/reviewers in case something has to be
> changed, thanks.

Can we update the log please ?

Thanks,
Lorenzo

> Lorenzo
> 
> > Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> > Signed-off-by: Pali Rohár <pali@kernel.org>
> > Signed-off-by: Marek Behún <kabel@kernel.org>
> > ---
> > Changes since batch 5:
> > - clarified commit message
> > - changed to new macro NOIRQ_SYSTEM_SLEEP_PM_OPS, as was done for many
> >   PCI controller drivers with commit 19b7858c3357 ("PCI: Convert to new
> >   *_PM_OPS macros")
> > ---
> >  drivers/pci/controller/pci-aardvark.c | 34 +++++++++++++++++++++++++++
> >  1 file changed, 34 insertions(+)
> > 
> > diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
> > index 3beafc893969..e30a33a4ecc6 100644
> > --- a/drivers/pci/controller/pci-aardvark.c
> > +++ b/drivers/pci/controller/pci-aardvark.c
> > @@ -1890,6 +1890,39 @@ static int advk_pcie_setup_phy(struct advk_pcie *pcie)
> >  	return ret;
> >  }
> >  
> > +static int advk_pcie_suspend(struct device *dev)
> > +{
> > +	struct advk_pcie *pcie = dev_get_drvdata(dev);
> > +
> > +	advk_pcie_disable_phy(pcie);
> > +
> > +	clk_disable_unprepare(pcie->clk);
> > +
> > +	return 0;
> > +}
> > +
> > +static int advk_pcie_resume(struct device *dev)
> > +{
> > +	struct advk_pcie *pcie = dev_get_drvdata(dev);
> > +	int ret;
> > +
> > +	ret = clk_prepare_enable(pcie->clk);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = advk_pcie_enable_phy(pcie);
> > +	if (ret)
> > +		return ret;
> > +
> > +	advk_pcie_setup_hw(pcie);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct dev_pm_ops advk_pcie_dev_pm_ops = {
> > +	NOIRQ_SYSTEM_SLEEP_PM_OPS(advk_pcie_suspend, advk_pcie_resume)
> > +};
> > +
> >  static int advk_pcie_probe(struct platform_device *pdev)
> >  {
> >  	struct device *dev = &pdev->dev;
> > @@ -2167,6 +2200,7 @@ static struct platform_driver advk_pcie_driver = {
> >  	.driver = {
> >  		.name = "advk-pcie",
> >  		.of_match_table = advk_pcie_of_match_table,
> > +		.pm = &advk_pcie_dev_pm_ops,
> >  	},
> >  	.probe = advk_pcie_probe,
> >  	.remove = advk_pcie_remove,
> > -- 
> > 2.35.1
> > 
> > 
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
diff mbox series

Patch

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 3beafc893969..e30a33a4ecc6 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1890,6 +1890,39 @@  static int advk_pcie_setup_phy(struct advk_pcie *pcie)
 	return ret;
 }
 
+static int advk_pcie_suspend(struct device *dev)
+{
+	struct advk_pcie *pcie = dev_get_drvdata(dev);
+
+	advk_pcie_disable_phy(pcie);
+
+	clk_disable_unprepare(pcie->clk);
+
+	return 0;
+}
+
+static int advk_pcie_resume(struct device *dev)
+{
+	struct advk_pcie *pcie = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(pcie->clk);
+	if (ret)
+		return ret;
+
+	ret = advk_pcie_enable_phy(pcie);
+	if (ret)
+		return ret;
+
+	advk_pcie_setup_hw(pcie);
+
+	return 0;
+}
+
+static const struct dev_pm_ops advk_pcie_dev_pm_ops = {
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(advk_pcie_suspend, advk_pcie_resume)
+};
+
 static int advk_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -2167,6 +2200,7 @@  static struct platform_driver advk_pcie_driver = {
 	.driver = {
 		.name = "advk-pcie",
 		.of_match_table = advk_pcie_of_match_table,
+		.pm = &advk_pcie_dev_pm_ops,
 	},
 	.probe = advk_pcie_probe,
 	.remove = advk_pcie_remove,