linux-kernel - Re: [PATCH v3 3/6] media: s5p-tv: Fix sdo driver to work with CCF

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Message-id: <2653159.4aiM8FeBLq@amdc1227>
Date:	Thu, 29 Aug 2013 15:14:44 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
Cc:	kyungmin.park@...sung.com, t.stanislaws@...sung.com,
	m.chehab@...sung.com, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	swarren@...dotorg.org, ian.campbell@...rix.com, rob@...dley.net,
	mturquette@...aro.org, tomasz.figa@...il.com,
	kgene.kim@...sung.com, thomas.abraham@...aro.org,
	s.nawrocki@...sung.com, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux@....linux.org.uk,
	ben-linux@...ff.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v3 3/6] media: s5p-tv: Fix sdo driver to work with CCF

Hi Mateusz,

On Wednesday 28 of August 2013 18:13:01 Mateusz Krawczuk wrote:
> Replace clk_enable by clock_enable_prepare and clk_disable with
> clk_disable_unprepare. Clock prepare is required by Clock Common
> Framework, and old clock driver didn`t support it. Without it Common
> Clock Framework prints a warning.
> 
> Signed-off-by: Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
> ---
>  drivers/media/platform/s5p-tv/sdo_drv.c | 25 +++++++++++++++----------
>  1 file changed, 15 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/media/platform/s5p-tv/sdo_drv.c
> b/drivers/media/platform/s5p-tv/sdo_drv.c index 9dbdfe6..a79e620 100644
> --- a/drivers/media/platform/s5p-tv/sdo_drv.c
> +++ b/drivers/media/platform/s5p-tv/sdo_drv.c
> @@ -209,10 +209,10 @@ static int sdo_streamon(struct sdo_device *sdev)
>  	clk_get_rate(sdev->fout_vpll));
>  	/* enable clock in SDO */
>  	sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_CLOCK_ON);
> -	ret = clk_enable(sdev->dacphy);
> +	ret = clk_prepare_enable(sdev->dacphy);
>  	if (ret < 0) {
>  		dev_err(sdev->dev,
> -			"clk_enable(dacphy) failed !\n");
> +			"clk_prepare_enable(dacphy) failed !\n");

nit: I haven't noticed this when reviewing previous patch, but please tone 
down those errors messages a bit, by removing the exclamation mark (and the 
space before it). We shouldn't be shouting at users. ;)

>  		goto fail;
>  	}
>  	/* enable DAC */
> @@ -230,7 +230,7 @@ static int sdo_streamoff(struct sdo_device *sdev)
>  	int tries;
> 
>  	sdo_write_mask(sdev, SDO_DAC, 0, SDO_POWER_ON_DAC);
> -	clk_disable(sdev->dacphy);
> +	clk_disable_unprepare(sdev->dacphy);
>  	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
>  	for (tries = 100; tries; --tries) {
>  		if (sdo_read(sdev, SDO_CLKCON) & SDO_TVOUT_CLOCK_READY)
> @@ -274,7 +274,7 @@ static int sdo_runtime_suspend(struct device *dev)
>  	dev_info(dev, "suspend\n");
>  	regulator_disable(sdev->vdet);
>  	regulator_disable(sdev->vdac);
> -	clk_disable(sdev->sclk_dac);
> +	clk_disable_unprepare(sdev->sclk_dac);
>  	return 0;
>  }
> 
> @@ -286,7 +286,7 @@ static int sdo_runtime_resume(struct device *dev)
> 
>  	dev_info(dev, "resume\n");
> 
> -	ret = clk_enable(sdev->sclk_dac);
> +	ret = clk_prepare_enable(sdev->sclk_dac);
>  	if (ret < 0)
>  		return ret;
> 
> @@ -319,7 +319,7 @@ static int sdo_runtime_resume(struct device *dev)
>  vdac_r_dis:
>  	regulator_disable(sdev->vdac);
>  dac_clk_dis:
> -	clk_disable(sdev->sclk_dac);
> +	clk_disable_unprepare(sdev->sclk_dac);
>  	return ret;
>  }
> 
> @@ -333,7 +333,7 @@ static int sdo_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct sdo_device *sdev;
>  	struct resource *res;
> -	int ret = 0;
> +	int ret;

Hmm, this change doesn't look like belonging to this patch.

>  	struct clk *sclk_vpll;
> 
>  	dev_info(dev, "probe start\n");
> @@ -425,8 +425,13 @@ static int sdo_probe(struct platform_device *pdev)
>  	}
> 
>  	/* enable gate for dac clock, because mixer uses it */
> -	clk_enable(sdev->dac);
> -
> +	ret = clk_prepare_enable(sdev->dac);
> +	if (ret < 0) {
> +		dev_err(dev,
> +			"clk_prepare_enable_enable(dac) failed !\n");
> +		ret = PTR_ERR(sdev->dac);

Hmm, ret already contains the error value returned by clk_prepare_enable() 
here, so this looks like a copy paste error.

Best regards,
Tomasz

> +		goto fail_fout_vpll;
> +	}
>  	/* configure power management */
>  	pm_runtime_enable(dev);
> 
> @@ -464,7 +469,7 @@ static int sdo_remove(struct platform_device *pdev)
>  	struct sdo_device *sdev = sd_to_sdev(sd);
> 
>  	pm_runtime_disable(&pdev->dev);
> -	clk_disable(sdev->dac);
> +	clk_disable_unprepare(sdev->dac);
>  	clk_put(sdev->fout_vpll);
>  	clk_put(sdev->dacphy);
>  	clk_put(sdev->dac);

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