linux-kernel - Re: [PATCH v4] pci: dwc: dra7xx: Add shutdown handler to cleanly turn off clocks

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Date:   Mon, 6 Nov 2017 11:22:47 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Keerthy <j-keerthy@...com>
Cc:     Niklas Cassel <nks.gnu@...il.com>, kishon@...com,
        bhelgaas@...gle.com, t-kristo@...com, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v4] pci: dwc: dra7xx: Add shutdown handler to cleanly
 turn off clocks

On Mon, Nov 06, 2017 at 10:34:28AM +0530, Keerthy wrote:
> 
> 
> On Friday 03 November 2017 08:00 PM, Niklas Cassel wrote:
> > dra7xx_pcie_shutdown should be static.
> > 
> > This patch introduces a new sparse warning.
> 
> Thanks Niklas for reporting.
> 
> Bjorn,
> 
> Should i send a next version or just a fix patch on top of this?

Either way is fine.  I'll just fold it in or replace the existing patch.

> > On Wed, Oct 11, 2017 at 9:32 PM, Bjorn Helgaas <helgaas@...nel.org> wrote:
> >> On Wed, Sep 20, 2017 at 10:54:15AM +0530, Keerthy wrote:
> >>> Add shutdown handler to cleanly turn off clocks. This will help
> >>> in cases of kexec where in a new kernel can boot abruptly.
> >>>
> >>> Signed-off-by: Keerthy <j-keerthy@...com>
> >>> Acked-by: Kishon Vijay Abraham I <kishon@...com>
> >>
> >> Applied to pci/host-dra7xx for v4.15, thanks!
> >>
> >>> ---
> >>>
> >>> Changes in v4:
> >>>
> >>>   * Added the missing changes from v2!
> >>>
> >>> Changes in v3:
> >>>
> >>>   * Pushed the function outside #ifdef CONFIG_PM_SLEEP.
> >>>   * Added more details to commit log.
> >>>
> >>> Changes in v2:
> >>>
> >>>   * used a local dev pointer instead of dereferencing dev at multiple places.
> >>>   * dra7xx_pcie_stop_link before disabling clks in the shutdown path.
> >>>
> >>>  drivers/pci/dwc/pci-dra7xx.c | 17 +++++++++++++++++
> >>>  1 file changed, 17 insertions(+)
> >>>
> >>> diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
> >>> index 34427a6..d084800 100644
> >>> --- a/drivers/pci/dwc/pci-dra7xx.c
> >>> +++ b/drivers/pci/dwc/pci-dra7xx.c
> >>> @@ -794,6 +794,22 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
> >>>  }
> >>>  #endif
> >>>
> >>> +void dra7xx_pcie_shutdown(struct platform_device *pdev)
> >>> +{
> >>> +     struct device *dev = &pdev->dev;
> >>> +     struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
> >>> +     int ret;
> >>> +
> >>> +     dra7xx_pcie_stop_link(dra7xx->pci);
> >>> +
> >>> +     ret = pm_runtime_put_sync(dev);
> >>> +     if (ret < 0)
> >>> +             dev_dbg(dev, "pm_runtime_put_sync failed\n");
> >>> +
> >>> +     pm_runtime_disable(dev);
> >>> +     dra7xx_pcie_disable_phy(dra7xx);
> >>> +}
> >>> +
> >>>  static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
> >>>       SET_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
> >>>       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
> >>> @@ -807,5 +823,6 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
> >>>               .suppress_bind_attrs = true,
> >>>               .pm     = &dra7xx_pcie_pm_ops,
> >>>       },
> >>> +     .shutdown = dra7xx_pcie_shutdown,
> >>>  };
> >>>  builtin_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
> >>> --
> >>> 1.9.1
> >>>