[PATCH v2 2/4] ASoc: fsl: fsl_qmc_audio: Ensure audio channels are ordered in TDM bus

[Herve Codina]

On Tue, 12 Aug 2025 12:50:56 +0200
Christophe Leroy <christophe.leroy at csgroup.eu> wrote:

> To reduce complexity of interrupt handling in following patch, ensure
> audio channels are configured in the same order as timeslots on the
> TDM bus. If we need a given ordering of audio sources in the audio
> frame, it is possible to re-order codecs on the TDM bus, no need to
> mix up timeslots in channels.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>
> ---
> v2: New
> ---
>  sound/soc/fsl/fsl_qmc_audio.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/sound/soc/fsl/fsl_qmc_audio.c b/sound/soc/fsl/fsl_qmc_audio.c
> index 5614a8b909edf..0be29ccc1ff7b 100644
> --- a/sound/soc/fsl/fsl_qmc_audio.c
> +++ b/sound/soc/fsl/fsl_qmc_audio.c
> @@ -791,12 +791,17 @@ static int qmc_audio_dai_parse(struct qmc_audio *qmc_audio, struct device_node *
>  			       struct qmc_dai *qmc_dai,
>  			       struct snd_soc_dai_driver *qmc_soc_dai_driver)
>  {
> +	struct qmc_chan_ts_info ts_info;
>  	struct qmc_chan_info info;
>  	unsigned long rx_fs_rate;
>  	unsigned long tx_fs_rate;
> +	int prev_last_rx_ts = 0;
> +	int prev_last_tx_ts = 0;
>  	unsigned int nb_tx_ts;
>  	unsigned int nb_rx_ts;
>  	unsigned int i;
> +	int last_rx_ts;
> +	int last_tx_ts;
>  	int count;
>  	u32 val;
>  	int ret;
> @@ -879,6 +884,30 @@ static int qmc_audio_dai_parse(struct qmc_audio *qmc_audio, struct device_node *
>  				return -EINVAL;
>  			}
>  		}
> +
> +		ret = qmc_chan_get_ts_info(qmc_dai->qmc_chans[i], &ts_info);

qmc_chan_get_ts_info() need a struct qmc_chan as first parameter

qmc_dai->qmc_chans[i].qmc_chan instead of qmc_dai->qmc_chans[i].

The use of qmc_dai->qmc_chans[i] without .qmc_chan have to be done on patch 4 (cleanup patch).

Best regards,
Hervé