linux-kernel - Re: [PATCH v8 19/22] ASoC: tegra: Enable audio mclk during tegra_asoc_utils

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Date:   Sun, 19 Jan 2020 18:14:07 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, broonie@...nel.org,
        lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        mperttunen@...dia.com, gregkh@...uxfoundation.org,
        sboyd@...nel.org, robh+dt@...nel.org, mark.rutland@....com
Cc:     pdeschrijver@...dia.com, pgaikwad@...dia.com, spujar@...dia.com,
        josephl@...dia.com, daniel.lezcano@...aro.org,
        mmaddireddy@...dia.com, markz@...dia.com,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 19/22] ASoC: tegra: Enable audio mclk during
 tegra_asoc_utils_init

14.01.2020 10:24, Sowjanya Komatineni пишет:
> Tegra PMC clock clk_out_1 is dedicated for audio mclk from Tegra30
> through Tegra210 and currently Tegra clock driver keeps the audio
> mclk enabled.
> 
> With the move of PMC clocks from clock driver into pmc driver,
> audio mclk enable from clock driver is removed and this should be
> taken care by the audio driver.
> 
> tegra_asoc_utils_init calls tegra_asoc_utils_set_rate and audio mclk
> rate configuration is not needed during init and set_rate is actually
> done during hw_params callback.
> 
> So, this patch removes tegra_asoc_utils_set_rate call and just leaves
> the audio mclk enabled.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  sound/soc/tegra/tegra_asoc_utils.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/tegra/tegra_asoc_utils.c b/sound/soc/tegra/tegra_asoc_utils.c
> index 1dce5ad6e665..99584970f5f4 100644
> --- a/sound/soc/tegra/tegra_asoc_utils.c
> +++ b/sound/soc/tegra/tegra_asoc_utils.c
> @@ -216,9 +216,16 @@ int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
>  		data->clk_cdev1 = clk_out_1;
>  	}
>  
> -	ret = tegra_asoc_utils_set_rate(data, 44100, 256 * 44100);
> -	if (ret)
> +	/*
> +	 * FIXME: There is some unknown dependency between audio mclk disable
> +	 * and suspend-resume functionality on Tegra30, although audio mclk is
> +	 * only needed for audio.
> +	 */
> +	ret = clk_prepare_enable(data->clk_cdev1);
> +	if (ret) {
> +		dev_err(data->dev, "Can't enable cdev1: %d\n", ret);
>  		return ret;
> +	}
>  
>  	return 0;
>  }
> 

Shouldn't the clock be disabled on driver's removal?