Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1393926

Re: [PATCH v2 1/2] dmaengine: qcom-bam-dma: Add pm_runtime support

Show all headers | View raw

Hi Pramod

>>> @@ -715,10 +724,13 @@ static int bam_resume(struct dma_chan *chan)
>>>         struct bam_device *bdev = bchan->bdev;
>>>         unsigned long flag;
>>>
>>> +       pm_runtime_get_sync(bdev->dev);
>>>         spin_lock_irqsave(&bchan->vc.lock, flag);
>>>         writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_HALT));
>>>         bchan->paused = 0;
>>>         spin_unlock_irqrestore(&bchan->vc.lock, flag);
>>> +       pm_runtime_mark_last_busy(bdev->dev);
>>> +       pm_runtime_put_autosuspend(bdev->dev);
>>>
>>>         return 0;
>>>  }
>>
>> Why this function simply return 'success' without any error capture?
>>
> I should check return of pm_runtime_get_sync.

Ok, fine.

>>> @@ -1252,16 +1278,76 @@ static int bam_dma_remove(struct platform_device *pdev)
>>>
>>>         tasklet_kill(&bdev->task);
>>>
>>> +       pm_runtime_get_sync(&pdev->dev);
>>>         clk_disable_unprepare(bdev->bamclk);
>>> +       pm_runtime_disable(&pdev->dev);
>>> +       pm_runtime_put_noidle(&pdev->dev);
>>> +       pm_runtime_set_suspended(&pdev->dev);
>>> +
>>> +       return 0;
>>> +}
>>
>> Why this function simply return 'success' without any error capture?
> Need to handle it better.

Yes, need to handle __pm_runtime__ errors.

>>
>>> +static int bam_dma_runtime_suspend(struct device *dev)
>>> +{
>>> +       struct bam_device *bdev = dev_get_drvdata(dev);
>>> +
>>> +       clk_disable(bdev->bamclk);
>>> +
>>> +       return 0;
>>> +}
>>
>> Why this function simply return 'success' without any error capture?
> If probe has succeeded means bdev->bamclk is not NULL and error hence
> clk_disable wont return anything.

got it.

>>> +#ifdef CONFIG_PM_SLEEP
>>> +static int bam_dma_suspend(struct device *dev)
>>> +{
>>> +       struct bam_device *bdev = dev_get_drvdata(dev);
>>> +
>>> +       pm_runtime_force_suspend(dev);
>>> +
>>> +       clk_unprepare(bdev->bamclk);
>>>
>>>         return 0;
>>>  }
>>
>> Why this function simply return 'success' without any error capture?
> Same logic applies here as well, as pm_runtime_force_suspend and
> clk_unprepare may not return error in our case once probe is through.

got it.


Regards
Manish Badarkhe

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH v2 1/2] dmaengine: qcom-bam-dma: Add pm_runtime support Pramod Gurav <pramod.gurav@linaro.org> - 2016-05-03 11:40 +0200
  [PATCH v2 2/2] MAINTAINERS: Update the files to include the Qualcomm DMA folder Pramod Gurav <pramod.gurav@linaro.org> - 2016-05-03 11:40 +0200
  Re: [PATCH v2 1/2] dmaengine: qcom-bam-dma: Add pm_runtime support Manish Badarkhe <badarkhe.manish@gmail.com> - 2016-05-03 12:00 +0200
    Re: [PATCH v2 1/2] dmaengine: qcom-bam-dma: Add pm_runtime support Pramod Gurav <pramod.gurav@linaro.org> - 2016-05-03 13:40 +0200
      Re: [PATCH v2 1/2] dmaengine: qcom-bam-dma: Add pm_runtime support Manish Badarkhe <badarkhe.manish@gmail.com> - 2016-05-04 05:40 +0200

csiph-web