drivers: dma: intel-adsp-gpdma: Account for LLPL wrapping

In case the LLP wraps we need to re-read the LLPU to make sure we return
the correct value.

Suggested-by: Pierre-Louis Bossart <[email protected]>
Signed-off-by: Peter Ujfalusi <[email protected]>

Author: ujfalusi

drivers/dma/dma_intel_adsp_gpdma.c

@@ -131,9 +131,15 @@ static inline void intel_adsp_gpdma_llp_read(const struct device *dev,
 {
 #ifdef CONFIG_DMA_INTEL_ADSP_GPDMA_HAS_LLP
 	const struct intel_adsp_gpdma_cfg *const dev_cfg = dev->config;
+	uint32_t tmp;
 
-	*llp_l = dw_read(dev_cfg->shim, GPDMA_CHLLPL(channel));
+	tmp = dw_read(dev_cfg->shim, GPDMA_CHLLPL(channel));
 	*llp_u = dw_read(dev_cfg->shim, GPDMA_CHLLPU(channel));
+	*llp_l = dw_read(dev_cfg->shim, GPDMA_CHLLPL(channel));
+	if (tmp > *llp_l) {
+		/* re-read the LLPU value, as LLPL just wrapped */
+		*llp_u = dw_read(dev_cfg->shim, GPDMA_CHLLPU(channel));
+	}
 #endif
 }