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

From: Lorenzo Pieralisi <lpieralisi@kernel.org>
To: "Marek Behún" <kabel@kernel.org>
Cc: "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
	"Bjorn Helgaas" <helgaas@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	pali@kernel.org, linux-pci@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	"Miquel Raynal" <miquel.raynal@bootlin.com>
Subject: Re: [PATCH 07/11] PCI: aardvark: Add suspend to RAM support
Date: Tue, 27 Sep 2022 10:30:15 +0200	[thread overview]
Message-ID: <YzK0l1icE45Lhysl@lpieralisi> (raw)
In-Reply-To: <YxsWXSysbgfTHY47@lpieralisi>

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
> 
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