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SubjectRe: [PATCH v2 2/6] ASoC: atmel_ssc_dai: rework DAI format configuration
Date
On 24.08.2019 23:26, Michał Mirosław wrote:
> Rework DAI format calculation in preparation for adding more formats
> later. As a side-effect this enables all CBM/CBS x CFM/CFS combinations
> for supported formats. (Note: the additional modes are not tested.)

The only mode added (and not tested) is for SND_SOC_DAIFMT_DSP_A |
SND_SOC_DAIFMT_CBM_CFS. I would mention it explicitly, instead of
something generic. Also, SND_SOC_DAIFMT_CBM_CFS is not supported for any
format, please see atmel_ssc_hw_rule_rate().

>
> Note: this changes FSEDGE to POSITIVE for I2S CBM_CFS mode as the TXSYN
> interrupt is not used anyway.
>
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
>
> ---
> v2: added note about extended modes' status
> incorporated common FS (LRCLK) configuration
>
> ---
> sound/soc/atmel/atmel_ssc_dai.c | 286 +++++++++-----------------------
> 1 file changed, 80 insertions(+), 206 deletions(-)
>
> diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
> index 6f89483ac88c..7dc6ec9b8c7a 100644
> --- a/sound/soc/atmel/atmel_ssc_dai.c
> +++ b/sound/soc/atmel/atmel_ssc_dai.c
> @@ -471,7 +471,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
> int dir, channels, bits;
> u32 tfmr, rfmr, tcmr, rcmr;
> int ret;
> - int fslen, fslen_ext;
> + int fslen, fslen_ext, fs_osync, fs_edge;
> u32 cmr_div;
> u32 tcmr_period;
> u32 rcmr_period;
> @@ -558,226 +558,36 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
> /*
> * Compute SSC register settings.
> */
> - switch (ssc_p->daifmt
> - & (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) {
>
> - case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
> - /*
> - * I2S format, SSC provides BCLK and LRC clocks.
> - *
> - * The SSC transmit and receive clocks are generated
> - * from the MCK divider, and the BCLK signal
> - * is output on the SSC TK line.
> - */
> -
> - if (bits > 16 && !ssc->pdata->has_fslen_ext) {
> - dev_err(dai->dev,
> - "sample size %d is too large for SSC device\n",
> - bits);
> - return -EINVAL;
> - }
> -
> - fslen_ext = (bits - 1) / 16;
> - fslen = (bits - 1) % 16;
> -
> - rcmr = SSC_BF(RCMR_PERIOD, rcmr_period)
> - | SSC_BF(RCMR_STTDLY, START_DELAY)
> - | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
> - | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
> - | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
> - | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
> -
> - rfmr = SSC_BF(RFMR_FSLEN_EXT, fslen_ext)
> - | SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
> - | SSC_BF(RFMR_FSLEN, fslen)
> - | SSC_BF(RFMR_DATNB, (channels - 1))
> - | SSC_BIT(RFMR_MSBF)
> - | SSC_BF(RFMR_LOOP, 0)
> - | SSC_BF(RFMR_DATLEN, (bits - 1));
> -
> - tcmr = SSC_BF(TCMR_PERIOD, tcmr_period)
> - | SSC_BF(TCMR_STTDLY, START_DELAY)
> - | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
> - | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
> - | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
> - | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
> -
> - tfmr = SSC_BF(TFMR_FSLEN_EXT, fslen_ext)
> - | SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(TFMR_FSDEN, 0)
> - | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
> - | SSC_BF(TFMR_FSLEN, fslen)
> - | SSC_BF(TFMR_DATNB, (channels - 1))
> - | SSC_BIT(TFMR_MSBF)
> - | SSC_BF(TFMR_DATDEF, 0)
> - | SSC_BF(TFMR_DATLEN, (bits - 1));
> - break;
> -
> - case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM:
> - /* I2S format, CODEC supplies BCLK and LRC clocks. */
> - rcmr = SSC_BF(RCMR_PERIOD, 0)
> - | SSC_BF(RCMR_STTDLY, START_DELAY)
> - | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
> - | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
> - | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
> - | SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
> - SSC_CKS_PIN : SSC_CKS_CLOCK);
> -
> - rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
> - | SSC_BF(RFMR_FSLEN, 0)
> - | SSC_BF(RFMR_DATNB, (channels - 1))
> - | SSC_BIT(RFMR_MSBF)
> - | SSC_BF(RFMR_LOOP, 0)
> - | SSC_BF(RFMR_DATLEN, (bits - 1));
> -
> - tcmr = SSC_BF(TCMR_PERIOD, 0)
> - | SSC_BF(TCMR_STTDLY, START_DELAY)
> - | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
> - | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
> - | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
> - | SSC_BF(TCMR_CKS, ssc->clk_from_rk_pin ?
> - SSC_CKS_CLOCK : SSC_CKS_PIN);
> + fslen_ext = (bits - 1) / 16;
> + fslen = (bits - 1) % 16;
>
> - tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(TFMR_FSDEN, 0)
> - | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
> - | SSC_BF(TFMR_FSLEN, 0)
> - | SSC_BF(TFMR_DATNB, (channels - 1))
> - | SSC_BIT(TFMR_MSBF)
> - | SSC_BF(TFMR_DATDEF, 0)
> - | SSC_BF(TFMR_DATLEN, (bits - 1));
> - break;
> -
> - case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFS:
> - /* I2S format, CODEC supplies BCLK, SSC supplies LRCLK. */
> - if (bits > 16 && !ssc->pdata->has_fslen_ext) {
> - dev_err(dai->dev,
> - "sample size %d is too large for SSC device\n",
> - bits);
> - return -EINVAL;
> - }
> -
> - fslen_ext = (bits - 1) / 16;
> - fslen = (bits - 1) % 16;
> -
> - rcmr = SSC_BF(RCMR_PERIOD, rcmr_period)
> - | SSC_BF(RCMR_STTDLY, START_DELAY)
> - | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
> - | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
> - | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
> - | SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
> - SSC_CKS_PIN : SSC_CKS_CLOCK);
> -
> - rfmr = SSC_BF(RFMR_FSLEN_EXT, fslen_ext)
> - | SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
> - | SSC_BF(RFMR_FSLEN, fslen)
> - | SSC_BF(RFMR_DATNB, (channels - 1))
> - | SSC_BIT(RFMR_MSBF)
> - | SSC_BF(RFMR_LOOP, 0)
> - | SSC_BF(RFMR_DATLEN, (bits - 1));
> -
> - tcmr = SSC_BF(TCMR_PERIOD, tcmr_period)
> - | SSC_BF(TCMR_STTDLY, START_DELAY)
> - | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
> - | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
> - | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
> - | SSC_BF(TCMR_CKS, ssc->clk_from_rk_pin ?
> - SSC_CKS_CLOCK : SSC_CKS_PIN);
> -
> - tfmr = SSC_BF(TFMR_FSLEN_EXT, fslen_ext)
> - | SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_NEGATIVE)
> - | SSC_BF(TFMR_FSDEN, 0)
> - | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
> - | SSC_BF(TFMR_FSLEN, fslen)
> - | SSC_BF(TFMR_DATNB, (channels - 1))
> - | SSC_BIT(TFMR_MSBF)
> - | SSC_BF(TFMR_DATDEF, 0)
> - | SSC_BF(TFMR_DATLEN, (bits - 1));
> - break;
> -
> - case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS:
> - /*
> - * DSP/PCM Mode A format, SSC provides BCLK and LRC clocks.
> - *
> - * The SSC transmit and receive clocks are generated from the
> - * MCK divider, and the BCLK signal is output
> - * on the SSC TK line.
> - */
> - rcmr = SSC_BF(RCMR_PERIOD, rcmr_period)
> - | SSC_BF(RCMR_STTDLY, 1)
> - | SSC_BF(RCMR_START, SSC_START_RISING_RF)
> - | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
> - | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
> - | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
> + switch (ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {
>
> - rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(RFMR_FSOS, SSC_FSOS_POSITIVE)
> - | SSC_BF(RFMR_FSLEN, 0)
> - | SSC_BF(RFMR_DATNB, (channels - 1))
> - | SSC_BIT(RFMR_MSBF)
> - | SSC_BF(RFMR_LOOP, 0)
> - | SSC_BF(RFMR_DATLEN, (bits - 1));
> + case SND_SOC_DAIFMT_I2S:
> + fs_osync = SSC_FSOS_NEGATIVE;
> + fs_edge = SSC_START_FALLING_RF;
>
> - tcmr = SSC_BF(TCMR_PERIOD, tcmr_period)
> - | SSC_BF(TCMR_STTDLY, 1)
> - | SSC_BF(TCMR_START, SSC_START_RISING_RF)
> - | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
> - | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
> - | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
> + rcmr = SSC_BF(RCMR_STTDLY, 1);
> + tcmr = SSC_BF(TCMR_STTDLY, 1);
>
> - tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(TFMR_FSDEN, 0)
> - | SSC_BF(TFMR_FSOS, SSC_FSOS_POSITIVE)
> - | SSC_BF(TFMR_FSLEN, 0)
> - | SSC_BF(TFMR_DATNB, (channels - 1))
> - | SSC_BIT(TFMR_MSBF)
> - | SSC_BF(TFMR_DATDEF, 0)
> - | SSC_BF(TFMR_DATLEN, (bits - 1));
> break;
>
> - case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
> + case SND_SOC_DAIFMT_DSP_A:
> /*
> - * DSP/PCM Mode A format, CODEC supplies BCLK and LRC clocks.
> + * DSP/PCM Mode A format
> *
> * Data is transferred on first BCLK after LRC pulse rising
> * edge.If stereo, the right channel data is contiguous with
> * the left channel data.
> */
> - rcmr = SSC_BF(RCMR_PERIOD, 0)
> - | SSC_BF(RCMR_STTDLY, START_DELAY)
> - | SSC_BF(RCMR_START, SSC_START_RISING_RF)
> - | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
> - | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
> - | SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
> - SSC_CKS_PIN : SSC_CKS_CLOCK);
> + fs_osync = SSC_FSOS_POSITIVE;
> + fs_edge = SSC_START_RISING_RF;
> + fslen = fslen_ext = 0;
>
> - rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
> - | SSC_BF(RFMR_FSLEN, 0)
> - | SSC_BF(RFMR_DATNB, (channels - 1))
> - | SSC_BIT(RFMR_MSBF)
> - | SSC_BF(RFMR_LOOP, 0)
> - | SSC_BF(RFMR_DATLEN, (bits - 1));
> + rcmr = SSC_BF(RCMR_STTDLY, 1);
> + tcmr = SSC_BF(TCMR_STTDLY, 1);
>
> - tcmr = SSC_BF(TCMR_PERIOD, 0)
> - | SSC_BF(TCMR_STTDLY, START_DELAY)
> - | SSC_BF(TCMR_START, SSC_START_RISING_RF)
> - | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
> - | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
> - | SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
> - SSC_CKS_CLOCK : SSC_CKS_PIN);
> -
> - tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> - | SSC_BF(TFMR_FSDEN, 0)
> - | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
> - | SSC_BF(TFMR_FSLEN, 0)
> - | SSC_BF(TFMR_DATNB, (channels - 1))
> - | SSC_BIT(TFMR_MSBF)
> - | SSC_BF(TFMR_DATDEF, 0)
> - | SSC_BF(TFMR_DATLEN, (bits - 1));
> break;
>
> default:
> @@ -785,6 +595,70 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
> ssc_p->daifmt);
> return -EINVAL;
> }
> +
> + if (!atmel_ssc_cfs(ssc_p)) {
> + fslen = fslen_ext = 0;
> + rcmr_period = tcmr_period = 0;
> + fs_osync = SSC_FSOS_NONE;
> + }
> +
> + rcmr |= SSC_BF(RCMR_START, fs_edge);
> + tcmr |= SSC_BF(TCMR_START, fs_edge);

Why not move these below in the code, where all the other bits of these
two registers are set?

> +
> + if (atmel_ssc_cbs(ssc_p)) {
> + /*
> + * SSC provides BCLK
> + *
> + * The SSC transmit and receive clocks are generated from the
> + * MCK divider, and the BCLK signal is output
> + * on the SSC TK line.
> + */
> + rcmr |= SSC_BF(RCMR_CKS, SSC_CKS_DIV)
> + | SSC_BF(RCMR_CKO, SSC_CKO_NONE);
> +
> + tcmr |= SSC_BF(TCMR_CKS, SSC_CKS_DIV)
> + | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS);
> + } else {
> + rcmr |= SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
> + SSC_CKS_PIN : SSC_CKS_CLOCK)
> + | SSC_BF(RCMR_CKO, SSC_CKO_NONE);
> +
> + tcmr |= SSC_BF(TCMR_CKS, ssc->clk_from_rk_pin ?
> + SSC_CKS_CLOCK : SSC_CKS_PIN)
> + | SSC_BF(TCMR_CKO, SSC_CKO_NONE);
> + }
> +
> + rcmr |= SSC_BF(RCMR_PERIOD, rcmr_period)
> + | SSC_BF(RCMR_CKI, SSC_CKI_RISING);
> +
> + tcmr |= SSC_BF(TCMR_PERIOD, tcmr_period)
> + | SSC_BF(TCMR_CKI, SSC_CKI_FALLING);
> +
> + rfmr = SSC_BF(RFMR_FSLEN_EXT, fslen_ext)
> + | SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> + | SSC_BF(RFMR_FSOS, fs_osync)
> + | SSC_BF(RFMR_FSLEN, fslen)
> + | SSC_BF(RFMR_DATNB, (channels - 1))
> + | SSC_BIT(RFMR_MSBF)
> + | SSC_BF(RFMR_LOOP, 0)
> + | SSC_BF(RFMR_DATLEN, (bits - 1));
> +
> + tfmr = SSC_BF(TFMR_FSLEN_EXT, fslen_ext)
> + | SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
> + | SSC_BF(TFMR_FSDEN, 0)
> + | SSC_BF(TFMR_FSOS, fs_osync)
> + | SSC_BF(TFMR_FSLEN, fslen)
> + | SSC_BF(TFMR_DATNB, (channels - 1))
> + | SSC_BIT(TFMR_MSBF)
> + | SSC_BF(TFMR_DATDEF, 0)
> + | SSC_BF(TFMR_DATLEN, (bits - 1));
> +
> + if (fslen_ext && !ssc->pdata->has_fslen_ext) {
> + dev_err(dai->dev, "sample size %d is too large for SSC device\n",
> + bits);
> + return -EINVAL;
> + }
> +
> pr_debug("atmel_ssc_hw_params: "
> "RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n",
> rcmr, rfmr, tcmr, tfmr);
>

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