linux-kernel - Re: [PATCH 3/3] drm/bridge: sii902x: make audio mclk optional

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Message-ID: <2828a8ca-6d25-fe49-f97a-cfd86e5d5fac@st.com>
Date:   Fri, 5 Jul 2019 12:36:11 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Olivier MOYSAN <olivier.moysan@...com>,
        "a.hajda@...sung.com" <a.hajda@...sung.com>,
        "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "jonas@...boo.se" <jonas@...boo.se>,
        "jernej.skrabec@...l.net" <jernej.skrabec@...l.net>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Benjamin GAIGNARD <benjamin.gaignard@...com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "jsarha@...com" <jsarha@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 3/3] drm/bridge: sii902x: make audio mclk optional

Hi Olivier,
and many thanks for your patch.

Reviewed-by: Philippe Cornu <philippe.cornu@...com>
Philippe :-)

On 7/2/19 5:47 PM, Olivier Moysan wrote:
> The master clock on i2s bus is not mandatory,
> as sii902X internal PLL can be used instead.
> Make use of mclk optional.
> 
> Fixes: ff5781634c41 ("drm/bridge: sii902x: Implement HDMI audio support")
> 
> Signed-off-by: Olivier Moysan <olivier.moysan@...com>
> ---
>   drivers/gpu/drm/bridge/sii902x.c | 39 +++++++++++++++++++++++----------------
>   1 file changed, 23 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 36acc256e67e..a08bd9fdc046 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -562,19 +562,21 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
>   		}
>   	}
>   
> -	ret = clk_prepare_enable(sii902x->audio.mclk);
> -	if (ret) {
> -		dev_err(dev, "Enabling mclk failed: %d\n", ret);
> -		return ret;
> -	}
> +	if (sii902x->audio.mclk) {
> +		ret = clk_prepare_enable(sii902x->audio.mclk);
> +		if (ret) {
> +			dev_err(dev, "Enabling mclk failed: %d\n", ret);
> +			return ret;
> +		}
>   
> -	mclk_rate = clk_get_rate(sii902x->audio.mclk);
> +		mclk_rate = clk_get_rate(sii902x->audio.mclk);
>   
> -	ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
> -				      mclk_rate);
> -	if (mclk_rate != ret * params->sample_rate)
> -		dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> -			mclk_rate, ret, params->sample_rate);
> +		ret = sii902x_select_mclk_div(&i2s_config_reg,
> +					      params->sample_rate, mclk_rate);
> +		if (mclk_rate != ret * params->sample_rate)
> +			dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> +				mclk_rate, ret, params->sample_rate);
> +	}
>   
>   	mutex_lock(&sii902x->mutex);
>   
> @@ -640,7 +642,8 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
>   	mutex_unlock(&sii902x->mutex);
>   
>   	if (ret) {
> -		clk_disable_unprepare(sii902x->audio.mclk);
> +		if (sii902x->audio.mclk)
> +			clk_disable_unprepare(sii902x->audio.mclk);
>   		dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
>   			ret);
>   	}
> @@ -659,7 +662,8 @@ static void sii902x_audio_shutdown(struct device *dev, void *data)
>   
>   	mutex_unlock(&sii902x->mutex);
>   
> -	clk_disable_unprepare(sii902x->audio.mclk);
> +	if (sii902x->audio.mclk)
> +		clk_disable_unprepare(sii902x->audio.mclk);
>   }
>   
>   int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
> @@ -752,9 +756,12 @@ static int sii902x_audio_codec_init(struct sii902x *sii902x,
>   
>   	sii902x->audio.mclk = devm_clk_get(dev, "mclk");
>   	if (IS_ERR(sii902x->audio.mclk)) {
> -		dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> -			__func__, PTR_ERR(sii902x->audio.mclk));
> -		return 0;
> +		if (PTR_ERR(sii902x->audio.mclk) != -ENOENT) {
> +			dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> +				__func__, PTR_ERR(sii902x->audio.mclk));
> +			return PTR_ERR(sii902x->audio.mclk);
> +		}
> +		sii902x->audio.mclk = NULL;
>   	}
>   
>   	sii902x->audio.pdev = platform_device_register_data(
>