linux-kernel - Re: [PATCH] ASoC: wm8962: add .set_tdm

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Message-ID: <aXibZNhIZI01tJyZ@opensource.cirrus.com>
Date: Tue, 27 Jan 2026 11:03:00 +0000
From: Charles Keepax <ckeepax@...nsource.cirrus.com>
To: Shengjiu Wang <shengjiu.wang@....com>
Cc: lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        kuninori.morimoto.gx@...esas.com, sebastian.krzyszkowiak@...i.sm,
        brgl@...nel.org, patches@...nsource.cirrus.com,
        linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org,
        shengjiu.wang@...il.com
Subject: Re: [PATCH] ASoC: wm8962: add .set_tdm_slot callback function

On Tue, Jan 27, 2026 at 06:33:26PM +0800, Shengjiu Wang wrote:
> The slot_width can be different with the params_width(), for example,
> DSP_A mode, slot_width = 32, but data format is S16_LE, if the word
> length is configured to be 16, there is no sound on the right speaker.
> 
> So add .set_tdm_slot() callback function to configure the slot_width and
> update the word length according to slot_width in hw_params().
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
> +static int wm8962_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
> +			       unsigned int rx_mask, int slots, int slot_width)
> +{
> +	struct snd_soc_component *component = dai->component;
> +	struct wm8962_priv *wm8962 = snd_soc_component_get_drvdata(component);
> +
> +	if (slots <= 0 || slot_width <= 0)
> +		return 0;

You probably shouldn't bail out here, how does one disable TDM if
it is no longer required?

I think the rest looks good.

Thanks,
Charles