linux-kernel - Re: [PATCH v5 6/9] media: adv748x: prepare/enable mclk when the audio is used

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Date:   Thu, 18 Jun 2020 17:23:14 +0100
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Alex Riesen <alexander.riesen@...itec.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        devel@...verdev.osuosl.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v5 6/9] media: adv748x: prepare/enable mclk when the audio
 is used

Hi Alex,

On 02/04/2020 19:34, Alex Riesen wrote:
> As there is nothing else (the consumers are supposed to do that) which
> enables the clock, do it in the driver.
> 
> Signed-off-by: Alexander Riesen <alexander.riesen@...itec.com>
> --
> 
> v3: added
> ---
>  drivers/media/i2c/adv748x/adv748x-dai.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/adv748x/adv748x-dai.c b/drivers/media/i2c/adv748x/adv748x-dai.c
> index c9191f8f1ca8..185f78023e91 100644
> --- a/drivers/media/i2c/adv748x/adv748x-dai.c
> +++ b/drivers/media/i2c/adv748x/adv748x-dai.c
> @@ -117,11 +117,22 @@ static int adv748x_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
>  
>  static int adv748x_dai_startup(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
>  {
> +	int ret;
>  	struct adv748x_state *state = state_of(dai);
>  
>  	if (sub->stream != SNDRV_PCM_STREAM_CAPTURE)
>  		return -EINVAL;
this looks quite bunched up so :

Newline...

> -	return set_audio_pads_state(state, 1);
> +	ret = set_audio_pads_state(state, 1);
> +	if (ret)
> +		goto fail;

With no action required to cleanup here, I would just
		return ret;
and remove the fail: label.


Newline...

> +	ret = clk_prepare_enable(mclk_of(state));
> +	if (ret)
> +		goto fail_pwdn;

newline...

> +	return 0;

newline...

Other than that:

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

> +fail_pwdn:
> +	set_audio_pads_state(state, 0);
> +fail:
> +	return ret;
>  }
>  
>  static int adv748x_dai_hw_params(struct snd_pcm_substream *sub,
> @@ -174,6 +185,7 @@ static void adv748x_dai_shutdown(struct snd_pcm_substream *sub, struct snd_soc_d
>  {
>  	struct adv748x_state *state = state_of(dai);
>  
> +	clk_disable_unprepare(mclk_of(state));
>  	set_audio_pads_state(state, 0);
>  }
>  
>