drivers: dai: intel: ssp: Introduce DMA control set API

This commit adds a new API function, `dai_ssp_dma_control_set`, to the
Intel SSP DAI driver. This function is designed to set DMA control
parameters specifically for the SSP interface.

The addition of this API function allows for more granular control of
DMA settings, which can be beneficial in scenarios where DMA
configuration needs to be modified independently of other DAI settings.

Signed-off-by: Tomasz Leman <[email protected]>

Author: tmleman

drivers/dai/intel/ssp/ssp.c

@@ -1869,6 +1869,39 @@ static int dai_ssp_check_aux_data(struct ssp_intel_aux_tlv *aux_tlv, int aux_len
 	return 0;
 }
 
+/**
+ * This function checks if the provided buffer contains valid DMA control
+ * TLV (Type-Length-Value) entries. It ensures that only specific types
+ * of DMA control settings are allowed to be modified at runtime.
+ */
+static int dai_ssp_check_dma_control(const uint8_t *aux_ptr, int aux_len)
+{
+	int hop;
+	struct ssp_intel_aux_tlv *aux_tlv;
+
+	for (int i = 0; i < aux_len; i += hop) {
+		aux_tlv = (struct ssp_intel_aux_tlv *)(aux_ptr);
+		switch (aux_tlv->type) {
+		case SSP_DMA_CLK_CONTROLS:
+		case SSP_DMA_TRANSMISSION_START:
+		case SSP_DMA_TRANSMISSION_STOP:
+		case SSP_DMA_ALWAYS_RUNNING_MODE:
+		case SSP_DMA_SYNC_DATA:
+		case SSP_DMA_CLK_CONTROLS_EXT:
+		case SSP_LINK_CLK_SOURCE:
+			break;
+		default:
+			LOG_ERR("incorect config type %u", aux_tlv->type);
+			return -EINVAL;
+		}
+
+		hop = aux_tlv->size + sizeof(struct ssp_intel_aux_tlv);
+		aux_ptr += hop;
+	}
+
+	return 0;
+}
+
 static int dai_ssp_parse_tlv(struct dai_intel_ssp *dp, const uint8_t *aux_ptr, size_t aux_len)
 {
 	int hop, i, j;
@@ -2556,13 +2589,38 @@ static int ssp_init(const struct device *dev)
 	return pm_device_runtime_enable(dev);
 }
 
+static int dai_ssp_dma_control_set(const struct device *dev,
+				   const void *bespoke_cfg,
+				   size_t size)
+{
+	struct dai_intel_ssp *dp = (struct dai_intel_ssp *)dev->data;
+
+	LOG_INF("SSP%d: tlv addr = 0x%x, tlv size = %d",
+		dp->dai_index, (uint32_t)bespoke_cfg, size);
+	if (size < sizeof(struct ssp_intel_aux_tlv)) {
+		return -EINVAL;
+	}
+
+	if (dp->state[DAI_DIR_PLAYBACK] != DAI_STATE_READY ||
+		dp->state[DAI_DIR_CAPTURE] != DAI_STATE_READY) {
+		return -EIO;
+	}
+
+	if (dai_ssp_check_dma_control(bespoke_cfg, size)) {
+		return -EINVAL;
+	}
+
+	return dai_ssp_parse_tlv(dp, bespoke_cfg, size);
+}
+
 static struct dai_driver_api dai_intel_ssp_api_funcs = {
 	.probe			= pm_device_runtime_get,
 	.remove			= pm_device_runtime_put,
 	.config_set		= dai_ssp_config_set,
 	.config_get		= dai_ssp_config_get,
 	.trigger		= dai_ssp_trigger,
 	.get_properties		= dai_ssp_get_properties,
+	.config_update		= dai_ssp_dma_control_set,
 };