dma: hda: enable xrun handling

Enable link under/overruns handling and reporting such events in dma
status

Signed-off-by: Piotr Makaruk <[email protected]>

Author: makarukp

drivers/dma/dma_intel_adsp_hda.c

@@ -190,6 +190,7 @@ int intel_adsp_hda_dma_status(const struct device *dev, uint32_t channel,
 	struct dma_status *stat)
 {
 	const struct intel_adsp_hda_dma_cfg *const cfg = dev->config;
+	bool xrun_det;
 
 	__ASSERT(channel < cfg->dma_channels, "Channel does not exist");
 
@@ -203,6 +204,25 @@ int intel_adsp_hda_dma_status(const struct device *dev, uint32_t channel,
 	stat->pending_length = used;
 	stat->free = unused;
 
+	switch (cfg->direction) {
+	case MEMORY_TO_PERIPHERAL:
+		xrun_det = intel_adsp_hda_is_buffer_underrun(cfg->base, cfg->regblock_size,
+							     channel);
+		if (xrun_det) {
+			intel_adsp_hda_underrun_clear(cfg->base, cfg->regblock_size, channel);
+			return -EPIPE;
+		}
+	case PERIPHERAL_TO_MEMORY:
+		xrun_det = intel_adsp_hda_is_buffer_overrun(cfg->base, cfg->regblock_size,
+							    channel);
+		if (xrun_det) {
+			intel_adsp_hda_overrun_clear(cfg->base, cfg->regblock_size, channel);
+			return -EPIPE;
+		}
+	default:
+		break;
+	}
+
 	return 0;
 }
 

soc/xtensa/intel_adsp/common/include/intel_adsp_hda.h

@@ -346,4 +346,28 @@ static inline bool intel_adsp_hda_wp_rp_eq(uint32_t base, uint32_t regblock_size
 	return *DGBWP(base, regblock_size, sid) == *DGBRP(base, regblock_size, sid);
 }
 
+static inline bool intel_adsp_hda_is_buffer_overrun(uint32_t base, uint32_t regblock_size,
+						    uint32_t sid)
+{
+	return (*DGCS(base, regblock_size, sid) & DGCS_BOR) == DGCS_BOR ? 1 : 0;
+}
+
+static inline bool intel_adsp_hda_is_buffer_underrun(uint32_t base, uint32_t regblock_size,
+						     uint32_t sid)
+{
+	return (*DGCS(base, regblock_size, sid) & DGCS_BUR) == DGCS_BUR ? 1 : 0;
+}
+
+static inline void intel_adsp_hda_overrun_clear(uint32_t base, uint32_t regblock_size,
+						uint32_t sid)
+{
+	*DGCS(base, regblock_size, sid) |= DGCS_BOR;
+}
+
+static inline void intel_adsp_hda_underrun_clear(uint32_t base, uint32_t regblock_size,
+						 uint32_t sid)
+{
+	*DGCS(base, regblock_size, sid) |= DGCS_BUR;
+}
+
 #endif /* ZEPHYR_INCLUDE_INTEL_ADSP_HDA_H */