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SubjectRe: [PATCH] ASoC: fsl_sai: Handle slave mode per TX/RX direction
On Sun, Aug 11, 2019 at 10:45:17PM +0300, Daniel Baluta wrote:
> From: Viorel Suman <viorel.suman@nxp.com>
>
> The SAI interface can be a clock supplier or consumer
> as a function of stream direction. e.g SAI can be master
> for Tx and slave for Rx.
>
> Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
> Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
> ---
> sound/soc/fsl/fsl_sai.c | 18 +++++++++---------
> sound/soc/fsl/fsl_sai.h | 2 +-
> 2 files changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> index 4a346fcb5630..69cf3678c859 100644
> --- a/sound/soc/fsl/fsl_sai.c
> +++ b/sound/soc/fsl/fsl_sai.c
> @@ -273,18 +273,18 @@ static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,

This function is called for both TX and RX at the same time from
fsl_sai_set_dai_fmt() so I don't actually see how it can operate
in two opposite directions from this change alone. Anything that
I have missed?

Thanks
Nicolin

> case SND_SOC_DAIFMT_CBS_CFS:
> val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
> val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
> - sai->is_slave_mode = false;
> + sai->is_slave_mode[tx] = false;
> break;
> case SND_SOC_DAIFMT_CBM_CFM:
> - sai->is_slave_mode = true;
> + sai->is_slave_mode[tx] = true;
> break;
> case SND_SOC_DAIFMT_CBS_CFM:
> val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
> - sai->is_slave_mode = false;
> + sai->is_slave_mode[tx] = false;
> break;
> case SND_SOC_DAIFMT_CBM_CFS:
> val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
> - sai->is_slave_mode = true;
> + sai->is_slave_mode[tx] = true;
> break;
> default:
> return -EINVAL;
> @@ -326,7 +326,7 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
> int ret = 0;
>
> /* Don't apply to slave mode */
> - if (sai->is_slave_mode)
> + if (sai->is_slave_mode[tx])
> return 0;
>
> for (id = 0; id < FSL_SAI_MCLK_MAX; id++) {
> @@ -422,7 +422,7 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
> if (sai->slot_width)
> slot_width = sai->slot_width;
>
> - if (!sai->is_slave_mode) {
> + if (!sai->is_slave_mode[tx]) {
> ret = fsl_sai_set_bclk(cpu_dai, tx,
> slots * slot_width * params_rate(params));
> if (ret)
> @@ -458,7 +458,7 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
> * error.
> */
>
> - if (!sai->is_slave_mode) {
> + if (!sai->is_slave_mode[tx]) {
> if (!sai->synchronous[TX] && sai->synchronous[RX] && !tx) {
> regmap_update_bits(sai->regmap, FSL_SAI_TCR4(ofs),
> FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
> @@ -497,7 +497,7 @@ static int fsl_sai_hw_free(struct snd_pcm_substream *substream,
> struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
> bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
>
> - if (!sai->is_slave_mode &&
> + if (!sai->is_slave_mode[tx] &&
> sai->mclk_streams & BIT(substream->stream)) {
> clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[tx]]);
> sai->mclk_streams &= ~BIT(substream->stream);
> @@ -581,7 +581,7 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
> * This is a hardware bug, and will be fix in the
> * next sai version.
> */
> - if (!sai->is_slave_mode) {
> + if (!sai->is_slave_mode[tx]) {
> /* Software Reset for both Tx and Rx */
> regmap_write(sai->regmap, FSL_SAI_TCSR(ofs),
> FSL_SAI_CSR_SR);
> diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
> index b89b0ca26053..c2c43a7d9ba1 100644
> --- a/sound/soc/fsl/fsl_sai.h
> +++ b/sound/soc/fsl/fsl_sai.h
> @@ -167,7 +167,7 @@ struct fsl_sai {
> struct clk *bus_clk;
> struct clk *mclk_clk[FSL_SAI_MCLK_MAX];
>
> - bool is_slave_mode;
> + bool is_slave_mode[2];
> bool is_lsb_first;
> bool is_dsp_mode;
> bool synchronous[2];
> --
> 2.17.1
>

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