linux-kernel - Re: [PATCH v3 1/3] soundwire: qcom: add runtime pm support

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Date:   Wed, 20 Apr 2022 12:39:26 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        robh+dt@...nel.org, vkoul@...nel.org,
        yung-chuan.liao@...ux.intel.com
Cc:     devicetree@...r.kernel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, quic_srivasam@...cinc.com
Subject: Re: [PATCH v3 1/3] soundwire: qcom: add runtime pm support



> @@ -1017,6 +1032,15 @@ static int qcom_swrm_startup(struct snd_pcm_substream *substream,
>  	struct snd_soc_dai *codec_dai;
>  	int ret, i;
>  
> +	ret = pm_runtime_get_sync(ctrl->dev);
> +	if (ret < 0 && ret != -EACCES) {
> +		dev_err_ratelimited(ctrl->dev,
> +				    "pm_runtime_get_sync failed in %s, ret %d\n",
> +				    __func__, ret);
> +		pm_runtime_put_noidle(ctrl->dev);
> +		return ret;

here there's an error handling, but ...

> +	}
> +
>  	sruntime = sdw_alloc_stream(dai->name);
>  	if (!sruntime)
>  		return -ENOMEM;
> @@ -1044,6 +1068,9 @@ static void qcom_swrm_shutdown(struct snd_pcm_substream *substream,
>  
>  	sdw_release_stream(ctrl->sruntime[dai->id]);
>  	ctrl->sruntime[dai->id] = NULL;
> +	pm_runtime_mark_last_busy(ctrl->dev);
> +	pm_runtime_put_autosuspend(ctrl->dev);
> +
>  }
>  
>  static const struct snd_soc_dai_ops qcom_swrm_pdm_dai_ops = {
> @@ -1197,12 +1224,23 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
>  static int swrm_reg_show(struct seq_file *s_file, void *data)
>  {
>  	struct qcom_swrm_ctrl *swrm = s_file->private;
> -	int reg, reg_val;
> +	int reg, reg_val, ret;
> +
> +	ret = pm_runtime_get_sync(swrm->dev);
> +	if (ret < 0 && ret != -EACCES) {
> +		dev_err_ratelimited(swrm->dev,
> +				    "pm_runtime_get_sync failed in %s, ret %d\n",
> +				    __func__, ret);
> +		pm_runtime_put_noidle(swrm->dev);

... here it's missing?

I have a fix ready but thought I would check first if this was intentional

https://github.com/thesofproject/linux/pull/3602/commits/6353eec8dc971c5f0fda0166ae1777f71784ea32

> +	}
>  
>  	for (reg = 0; reg <= SWR_MSTR_MAX_REG_ADDR; reg += 4) {
>  		swrm->reg_read(swrm, reg, &reg_val);
>  		seq_printf(s_file, "0x%.3x: 0x%.2x\n", reg, reg_val);
>  	}
> +	pm_runtime_mark_last_busy(swrm->dev);
> +	pm_runtime_put_autosuspend(swrm->dev);
> +
>  
>  	return 0;