ASoC: cygnus: Remove support for 8 bit audio and for mono

These modes of operation were not working properly and it is
unclear if the hardware could fully support these modes properly.
There is little to be gained by enabling these modes, therefore,
we will just remove support.
Signed-off-by: Lori Hikichi <lori.hikichi@broadcom.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/bcm/cygnus-ssp.c

@@ -655,23 +655,10 @@ static int cygnus_ssp_hw_params(struct snd_pcm_substream *substream,
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		value = readl(aio->cygaud->audio + aio->regs.bf_sourcech_cfg);
 		value &= ~BIT(BF_SRC_CFGX_BUFFER_PAIR_ENABLE);
-		/* Configure channels as mono or stereo/TDM */
-		if (params_channels(params) == 1)
-			value |= BIT(BF_SRC_CFGX_SAMPLE_CH_MODE);
-		else
 		value &= ~BIT(BF_SRC_CFGX_SAMPLE_CH_MODE);
 		writel(value, aio->cygaud->audio + aio->regs.bf_sourcech_cfg);
 
 		switch (params_format(params)) {
-		case SNDRV_PCM_FORMAT_S8:
-			if (aio->port_type == PORT_SPDIF) {
-				dev_err(aio->cygaud->dev,
-				"SPDIF does not support 8bit format\n");
-				return -EINVAL;
-			}
-			bitres = 8;
-			break;
-
 		case SNDRV_PCM_FORMAT_S16_LE:
 			bitres = 16;
 			break;
@@ -1148,11 +1135,10 @@ static const struct snd_soc_dai_ops cygnus_spdif_dai_ops = {
 #define INIT_CPU_DAI(num) { \
 	.name = "cygnus-ssp" #num, \
 	.playback = { \
-		.channels_min = 1, \
+		.channels_min = 2, \
 		.channels_max = 16, \
 		.rates = SNDRV_PCM_RATE_KNOT, \
-		.formats = SNDRV_PCM_FMTBIT_S8 | \
-				SNDRV_PCM_FMTBIT_S16_LE | \
+		.formats = SNDRV_PCM_FMTBIT_S16_LE | \
 				SNDRV_PCM_FMTBIT_S32_LE, \
 	}, \
 	.capture = { \