linux-kernel - Re: [PATCH v3] pci: dwc: dra7xx: Add shutdown handler to cleanly turn off clocks

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Date:   Wed, 20 Sep 2017 10:56:46 +0530
From:   Keerthy <j-keerthy@...com>
To:     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 v3] pci: dwc: dra7xx: Add shutdown handler to cleanly turn
 off clocks



On Wednesday 20 September 2017 01:00 AM, Bjorn Helgaas wrote:
> On Fri, Sep 08, 2017 at 10:44:54AM +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>
>> ---
>>
>> 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.
> 
> You lost both these changes in v3.  I assume you'll post a v4.

Thanks Bjorn for catching this!

Sent v4 with the corrections.

https://patchwork.ozlabs.org/patch/816010/

Regards,
Keerthy

> 
>>  drivers/pci/dwc/pci-dra7xx.c | 14 ++++++++++++++
>>  1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
>> index 0f9adf2..ec8f842 100644
>> --- a/drivers/pci/dwc/pci-dra7xx.c
>> +++ b/drivers/pci/dwc/pci-dra7xx.c
>> @@ -794,6 +794,19 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
>>  }
>>  #endif
>>  
>> +void dra7xx_pcie_shutdown(struct platform_device *pdev)
>> +{
>> +	struct dra7xx_pcie *dra7xx = dev_get_drvdata(&pdev->dev);
>> +	int ret;
>> +
>> +	ret = pm_runtime_put_sync(&pdev->dev);
>> +	if (ret < 0)
>> +		dev_dbg(&pdev->dev, "pm_runtime_put_sync failed\n");
>> +
>> +	pm_runtime_disable(&pdev->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 +820,6 @@ 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
>>