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

[Lorenzo Pieralisi <lpieralisi@kernel.org>]

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
> 
> 
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