linux-kernel - Re: [PATCH v4 1/5] ASoC: dwc: Prepare clock before use

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Message-ID: <549A6394.10507@arm.com>
Date:	Wed, 24 Dec 2014 06:56:20 +0000
From:	Andrew Jackson <Andrew.Jackson@....com>
To:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Mark Brown <broonie@...nel.org>
CC:	Liam Girdwood <lgirdwood@...il.com>,
	Rajeev Kumar <rajeevkumar.linux@...il.com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Arnd Bergmann <arnd@...db.de>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/5] ASoC: dwc: Prepare clock before use

On 12/23/14 13:56, Andrew Jackson wrote:
> From: Andrew Jackson <Andrew.Jackson@....com>
> 
> Some I2S clocks may require some time to get the clock ready
> for operation and so need to be prepared before they are enabled.
> So, prepare the clock as well as enabling it, but combine the
> two through clk_prepare_enable.

More turkey-focussed issues: this should have a clk_disable_unprepare too.  Sigh

	Andrew

> Signed-off-by: Andrew Jackson <Andrew.Jackson@....com>
> ---
>  sound/soc/dwc/designware_i2s.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
> index 06d3a34..9573ec7 100644
> --- a/sound/soc/dwc/designware_i2s.c
> +++ b/sound/soc/dwc/designware_i2s.c
> @@ -411,7 +411,7 @@ static int dw_i2s_probe(struct platform_device *pdev)
>  	if (IS_ERR(dev->clk))
>  		return  PTR_ERR(dev->clk);
>  
> -	ret = clk_enable(dev->clk);
> +	ret = clk_prepare_enable(dev->clk);
>  	if (ret < 0)
>  		goto err_clk_put;
>  
> 

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