linux-kernel - Re: [PATCH v4] ASoc: tas2781: Enable RCA-based playback without DSP firmware download

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Date: Fri, 31 May 2024 09:46:55 -0500
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To: Shenghao Ding <shenghao-ding@...com>, broonie@...nel.org
Cc: andriy.shevchenko@...ux.intel.com, lgirdwood@...il.com, perex@...ex.cz,
 13916275206@....com, alsa-devel@...a-project.org, i-salazar@...com,
 linux-kernel@...r.kernel.org, j-chadha@...com, liam.r.girdwood@...el.com,
 jaden-yue@...com, yung-chuan.liao@...ux.intel.com, dipa@...com,
 yuhsuan@...gle.com, tiwai@...e.de, baojun.xu@...com, soyer@....hu,
 Baojun.Xu@....com, judyhsiao@...gle.com, navada@...com,
 cujomalainey@...gle.com, aanya@...com, nayeem.mahmud@...com,
 savyasanchi.shukla@...radyne.com, flaviopr@...rosoft.com, jesse-ji@...com
Subject: Re: [PATCH v4] ASoc: tas2781: Enable RCA-based playback without DSP
 firmware download


> -enum tasdevice_dsp_fw_state {
> -	TASDEVICE_DSP_FW_NONE = 0,
> +enum tasdevice_fw_state {
> +	/* Driver in startup mode, not load any firmware. */
>  	TASDEVICE_DSP_FW_PENDING,
> +	/* DSP firmware in the system, but parsing error. */
>  	TASDEVICE_DSP_FW_FAIL,
> +	/*
> +	 * Only RCA (Reconfigurable Architecture) firmware load
> +	 * successfully.
> +	 */
> +	TASDEVICE_RCA_FW_OK,
> +	/* Both RCA and DSP firmware load successfully. */
>  	TASDEVICE_DSP_FW_ALL_OK,

I appreciate the effort to document the states, but for the RCA cases we
can have two 'success' states?

> -	tas_priv->fw_state = TASDEVICE_DSP_FW_PENDING;
> +	tas_priv->fw_state = TASDEVICE_RCA_FW_OK;
>  	scnprintf(tas_priv->coef_binaryname, 64, "%s_coef.bin",
>  		tas_priv->dev_name);
>  	ret = tasdevice_dsp_parser(tas_priv);
>  	if (ret) {
>  		dev_err(tas_priv->dev, "dspfw load %s error\n",
>  			tas_priv->coef_binaryname);
> -		tas_priv->fw_state = TASDEVICE_DSP_FW_FAIL;
>  		goto out;
>  	}
> -	tasdevice_dsp_create_ctrls(tas_priv);
> +
> +	/*
> +	 * If no dsp-related kcontrol created, the dsp resource will be freed.
> +	 */
> +	ret = tasdevice_dsp_create_ctrls(tas_priv);
> +	if (ret) {
> +		dev_err(tas_priv->dev, "dsp controls error\n");
> +		goto out;
> +	}
>  
>  	tas_priv->fw_state = TASDEVICE_DSP_FW_ALL_OK;

from this code, it seems that the RCA case goes from RCA_FW_OK to
TASDEVICE_DSP_FW_ALL_OK, so there's a difference between the two states, no?


> @@ -466,14 +474,14 @@ static int tasdevice_startup(struct snd_pcm_substream *substream,
>  {
>  	struct snd_soc_component *codec = dai->component;
>  	struct tasdevice_priv *tas_priv = snd_soc_component_get_drvdata(codec);
> -	int ret = 0;
>  
> -	if (tas_priv->fw_state != TASDEVICE_DSP_FW_ALL_OK) {
> -		dev_err(tas_priv->dev, "DSP bin file not loaded\n");
> -		ret = -EINVAL;
> +	switch (tas_priv->fw_state) {
> +	case TASDEVICE_RCA_FW_OK:
> +	case TASDEVICE_DSP_FW_ALL_OK:
> +		return 0;
> +	default:
> +		return -EINVAL;

maybe keep the error logs?