linux-kernel - Re: [PATCH] ASoC: qcom: lpass-cpu: Remove bit clock state check

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Message-ID: <16199fa8-7a87-6e7f-9db6-1d5cd8493d4c@linaro.org>
Date:   Wed, 27 Jan 2021 09:51:35 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Srinivasa Rao Mandadapu <srivasam@...eaurora.org>,
        agross@...nel.org, bjorn.andersson@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, plai@...eaurora.org,
        bgoswami@...eaurora.org, perex@...ex.cz, tiwai@...e.com,
        rohitkr@...eaurora.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: qcom: lpass-cpu: Remove bit clock state check



On 27/01/2021 06:30, Srinivasa Rao Mandadapu wrote:
> No need of BCLK state maintenance from driver side as
> clock_enable and clk_disable API's maintaing state counter.
> 
> One of the major issue was spotted when Headset jack inserted
> while playback continues, due to same PCM device node opens twice
> for playaback/capture and closes once for capture and playback continues.
> 
> It can resolve the errors in such scenarios.
> 
> Signed-off-by: Srinivasa Rao Mandadapu <srivasam@...eaurora.org>

Thanks for the cleanup, yes clk core will take care of this by 
enable_count check!

You should add

Fixes: b1824968221c ("ASoC: qcom: Fix enabling BCLK and LRCLK in LPAIF 
invalid state")


> ---
>   sound/soc/qcom/lpass-cpu.c       | 22 ++++++++--------------
>   sound/soc/qcom/lpass-lpaif-reg.h |  3 ---
>   sound/soc/qcom/lpass.h           |  1 -
>   3 files changed, 8 insertions(+), 18 deletions(-)
> 
> diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
> index ae8efbc89af2..a669202e0001 100644
> --- a/sound/soc/qcom/lpass-cpu.c
> +++ b/sound/soc/qcom/lpass-cpu.c
> @@ -286,16 +286,12 @@ static int lpass_cpu_daiops_trigger(struct snd_pcm_substream *substream,
>   			dev_err(dai->dev, "error writing to i2sctl reg: %d\n",
>   				ret);
>   
> -		if (drvdata->bit_clk_state[id] == LPAIF_BIT_CLK_DISABLE) {
> -			ret = clk_enable(drvdata->mi2s_bit_clk[id]);
> -			if (ret) {
> -				dev_err(dai->dev, "error in enabling mi2s bit clk: %d\n", ret);
> -				clk_disable(drvdata->mi2s_osr_clk[id]);
> -				return ret;
> -			}
> -			drvdata->bit_clk_state[id] = LPAIF_BIT_CLK_ENABLE;
> +		ret = clk_enable(drvdata->mi2s_bit_clk[id]);
> +		if (ret) {
> +			dev_err(dai->dev, "error in enabling mi2s bit clk: %d\n", ret);
> +			clk_disable(drvdata->mi2s_osr_clk[id]);

Can you also remove this unnecessary disable here!


-srini

> +			return ret;
>   		}
> -
>   		break;
>   	case SNDRV_PCM_TRIGGER_STOP:
>   	case SNDRV_PCM_TRIGGER_SUSPEND:
> @@ -310,10 +306,9 @@ static int lpass_cpu_daiops_trigger(struct snd_pcm_substream *substream,
>   		if (ret)
>   			dev_err(dai->dev, "error writing to i2sctl reg: %d\n",
>   				ret);
> -		if (drvdata->bit_clk_state[id] == LPAIF_BIT_CLK_ENABLE) {
> -			clk_disable(drvdata->mi2s_bit_clk[dai->driver->id]);
> -			drvdata->bit_clk_state[id] = LPAIF_BIT_CLK_DISABLE;
> -		}
> +
> +		clk_disable(drvdata->mi2s_bit_clk[dai->driver->id]);
> +
>   		break;
>   	}
>   
> @@ -861,7 +856,6 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
>   				PTR_ERR(drvdata->mi2s_bit_clk[dai_id]));
>   			return PTR_ERR(drvdata->mi2s_bit_clk[dai_id]);
>   		}
> -		drvdata->bit_clk_state[dai_id] = LPAIF_BIT_CLK_DISABLE;
>   	}
>   
>   	/* Allocation for i2sctl regmap fields */
> diff --git a/sound/soc/qcom/lpass-lpaif-reg.h b/sound/soc/qcom/lpass-lpaif-reg.h
> index 405542832e99..c8e1d75340b2 100644
> --- a/sound/soc/qcom/lpass-lpaif-reg.h
> +++ b/sound/soc/qcom/lpass-lpaif-reg.h
> @@ -60,9 +60,6 @@
>   #define LPAIF_I2SCTL_BITWIDTH_24	1
>   #define LPAIF_I2SCTL_BITWIDTH_32	2
>   
> -#define LPAIF_BIT_CLK_DISABLE		0
> -#define LPAIF_BIT_CLK_ENABLE		1
> -
>   #define LPAIF_I2SCTL_RESET_STATE	0x003C0004
>   #define LPAIF_DMACTL_RESET_STATE	0x00200000
>   
> diff --git a/sound/soc/qcom/lpass.h b/sound/soc/qcom/lpass.h
> index 2d68af0da34d..83b2e08ade06 100644
> --- a/sound/soc/qcom/lpass.h
> +++ b/sound/soc/qcom/lpass.h
> @@ -68,7 +68,6 @@ struct lpass_data {
>   	unsigned int mi2s_playback_sd_mode[LPASS_MAX_MI2S_PORTS];
>   	unsigned int mi2s_capture_sd_mode[LPASS_MAX_MI2S_PORTS];
>   	int hdmi_port_enable;
> -	int bit_clk_state[LPASS_MAX_MI2S_PORTS];
>   
>   	/* low-power audio interface (LPAIF) registers */
>   	void __iomem *lpaif;
>