ASoC: SOF: ipc-topology: Add 8-bit formats

This patch enables use of 8-bit unsigned, A-law, and mu-law
sample formats with IPC4 SOF.

Change to function sof_ipc4_get_valid_bits() returns 8 bits
for these ALSA formats.

Change to function sof_ipc4_prepare_copier_module() is needed
to handle properly all non 32-bit formats with SCS bit set.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

sound/soc/sof/ipc4-topology.c

@@ -1426,6 +1426,10 @@ static int sof_ipc4_init_output_audio_fmt(struct snd_sof_dev *sdev,
 static int sof_ipc4_get_valid_bits(struct snd_sof_dev *sdev, struct snd_pcm_hw_params *params)
 {
 	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_U8:
+	case SNDRV_PCM_FORMAT_MU_LAW:
+	case SNDRV_PCM_FORMAT_A_LAW:
+		return 8;
 	case SNDRV_PCM_FORMAT_S16_LE:
 		return 16;
 	case SNDRV_PCM_FORMAT_S24_LE:
@@ -1942,10 +1946,20 @@ sof_ipc4_prepare_copier_module(struct snd_sof_widget *swidget,
 			host_dma_id = platform_params->stream_tag - 1;
 			pipeline->msg.primary |= SOF_IPC4_GLB_CHAIN_DMA_HOST_ID(host_dma_id);
 
-			/* Set SCS bit for S16_LE format only */
 			if (params_format(fe_params) == SNDRV_PCM_FORMAT_S16_LE)
 				pipeline->msg.primary |= SOF_IPC4_GLB_CHAIN_DMA_SCS_MASK;
 
+			/* Set SCS bit for 8 and 16 bit formats */
+			switch (params_format(fe_params)) {
+			case SNDRV_PCM_FORMAT_S16_LE:
+			case SNDRV_PCM_FORMAT_U8:
+			case SNDRV_PCM_FORMAT_A_LAW:
+			case SNDRV_PCM_FORMAT_MU_LAW:
+				pipeline->msg.primary |= SOF_IPC4_GLB_CHAIN_DMA_SCS_MASK;
+			default:
+				break;
+			}
+
 			/*
 			 * Despite its name the bitfield 'fifo_size' is used to define DMA buffer
 			 * size. The expression calculates 2ms buffer size.