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 10:34:28 +0530
From:   Keerthy <j-keerthy@...com>
To:     Niklas Cassel <nks.gnu@...il.com>,
        Bjorn Helgaas <helgaas@...nel.org>
CC:     <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 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?

Regards,
Keerthy

> 
> 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
>>>