linux-kernel - Re: [PATCH v9] ASoc: tas2783: Add tas2783 codec driver

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Date: Thu, 22 Feb 2024 19:13:51 -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,
 linux-kernel@...r.kernel.org, liam.r.girdwood@...el.com,
 bard.liao@...el.com, mengdong.lin@...el.com,
 yung-chuan.liao@...ux.intel.com, baojun.xu@...com, kevin-lu@...com,
 tiwai@...e.de, soyer@....hu
Subject: Re: [PATCH v9] ASoc: tas2783: Add tas2783 codec driver

On 2/22/24 2:40 AM, Shenghao Ding wrote:
> The tas2783 is a smart audio amplifier with integrated MIPI SoundWire
> interface (Version 1.2.1 compliant), I2C, and I2S/TDM interfaces designed
> for portable applications. An on-chip DSP supports Texas Instruments
> SmartAmp speaker protection algorithm. The integrated speaker voltage and
> current sense provides for real-time monitoring of lodspeakers.

loudspeakers.


> +static void tas2783_apply_calib(struct tasdevice_priv *tas_dev,
> +	unsigned int *cali_data)
> +{
> +	struct regmap *map = tas_dev->regmap;
> +	u8 *cali_start;
> +	u16 offset;
> +	int ret;
> +
> +	if (!tas_dev->sdw_peripheral) {
> +		dev_err(tas_dev->dev, "%s: peripheral doesn't exist.\n",
> +			__func__);
> +		return;
> +	}
> +
> +	offset = tas_dev->sdw_peripheral->id.unique_id -
> +		TAS2783_UNIQUE_ID_BASE;
> +	if (offset >= TAS2783_MAX_DEV_NUM) {
> +		dev_err(tas_dev->dev, "%s: offset(%u) is out of range.\n",
> +			 __func__, offset);
> +		return;
> +	}

I think we are at the 4th iteration where I have to repeat myself...

In the SoundWire spec, the unique_id is *LINK SPECIFIC*, and only used 
at the bus level within the context of a link to help avoid enumeration 
conflicts

If you are using the unique_id as a SYSTEM-UNIQUE value to lookup EFI 
data, this is a TI-specific requirement that needs to be documented. 
That also means you need to double-check for errors so make sure there 
are no board configurations where the same unique_id is used in multiple 
links, or by devices other than tas2783.