linux-kernel - RE: [PATCH 1/2] DMA: PL330: Remove pm_runtime

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Date:	Thu, 08 Dec 2011 16:43:01 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	'Vinod Koul' <vinod.koul@...el.com>,
	'Tushar Behera' <tushar.behera@...aro.org>,
	'Boojin Kim' <boojin.kim@...sung.com>
Cc:	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org
Subject: RE: [PATCH 1/2] DMA: PL330: Remove pm_runtime_xxx calls from pl330
 probe/remove

Vinod Koul wrote:
> 
> On Tue, 2011-12-06 at 16:15 +0530, Tushar Behera wrote:
> > amba_probe() now calls pm_runtime_get_noresume() and pm_runtime_enable()
> > for the devices before the device probe is called. Hence we don't need
> > to call pm_runtime_get_xxx and pm_runtime_enable() in device probe again.
> > In the same way, since amba_remove() calls the respective pm_runtime
> > functions, those functions need not be called from device remove.
> >
> > This patch fixes following run time error with pl330 driver.
> >
> > dma-pl330 dma-pl330.0: Unbalanced pm_runtime_enable!
> > dma-pl330 dma-pl330.0: failed to get runtime pm
> >
> > Signed-off-by: Giridhar Maruthy <giridhar.maruthy@...aro.org>
> > Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
> Looks fine to me. Do you want these to go thru slave-dma or samsung
> tree.

Hi Vinod,

I think, this patch can be sent to upstream via slave-dma tree and second one via Samsung tree separately and you can add my and Boojin Kim's ack(actually, she replied) on this when you apply.

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@...sung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.

> For latter:
> Acked-by: Vinod Koul <vinod.koul@...ux.intel.com>
> 
> > ---
> >  drivers/dma/pl330.c |   17 ++---------------
> >  1 files changed, 2 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> > index a626e15..cd07121 100644
> > --- a/drivers/dma/pl330.c
> > +++ b/drivers/dma/pl330.c
> > @@ -834,17 +834,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
> >
> >  	amba_set_drvdata(adev, pdmac);
> >
> > -#ifdef CONFIG_PM_RUNTIME
> > -	/* to use the runtime PM helper functions */
> > -	pm_runtime_enable(&adev->dev);
> > -
> > -	/* enable the power domain */
> > -	if (pm_runtime_get_sync(&adev->dev)) {
> > -		dev_err(&adev->dev, "failed to get runtime pm\n");
> > -		ret = -ENODEV;
> > -		goto probe_err1;
> > -	}
> > -#else
> > +#ifndef CONFIG_PM_RUNTIME
> >  	/* enable dma clk */
> >  	clk_enable(pdmac->clk);
> >  #endif
> > @@ -977,10 +967,7 @@ static int __devexit pl330_remove(struct amba_device *adev)
> >  	res = &adev->res;
> >  	release_mem_region(res->start, resource_size(res));
> >
> > -#ifdef CONFIG_PM_RUNTIME
> > -	pm_runtime_put(&adev->dev);
> > -	pm_runtime_disable(&adev->dev);
> > -#else
> > +#ifndef CONFIG_PM_RUNTIME
> >  	clk_disable(pdmac->clk);
> >  #endif
> >
> 
> 
> --
> ~Vinod

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