[1/1] ASoC: dwc: Add Single DMA mode support

Commit Message

Myunguk Kim Sept. 8, 2023, 3:54 a.m. UTC

There is a SoC between dwc and DMA block (ie. PL330)
that does not have a burst signal and supports only single.

So write not-support-burst property on dts, it support single DMA mode.

Signed-off-by: Myunguk Kim <[e-mail]>
---
 include/sound/designware_i2s.h |  1 +
 sound/soc/dwc/dwc-i2s.c        | 12 ++++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

Patch

diff --git a/include/sound/designware_i2s.h b/include/sound/designware_i2s.h
index f6803205a9fb..060e0cbcd55c 100644
--- a/include/sound/designware_i2s.h
+++ b/include/sound/designware_i2s.h
@@ -36,6 +36,7 @@  struct i2s_platform_data 
{ 	#define DW_I2S_QUIRK_COMP_REG_OFFSET	(1 << 0)
 	#define DW_I2S_QUIRK_COMP_PARAM1	(1 << 1)
 	#define DW_I2S_QUIRK_16BIT_IDX_OVERRIDE (1 << 2)
+	#define DW_I2S_QUIRK_NOT_SUPPORT_BURST	(1 << 3)
 	unsigned int quirks;
 	unsigned int i2s_reg_comp1;
 	unsigned int i2s_reg_comp2;
diff --git a/sound/soc/dwc/dwc-i2s.c b/sound/soc/dwc/dwc-i2s.c
index 5ab1b3eb2d28..c4dd8c18beba 100644
--- a/sound/soc/dwc/dwc-i2s.c
+++ b/sound/soc/dwc/dwc-i2s.c
@@ -713,7 +713,10 @@  static int dw_configure_dai_by_dt(struct dw_i2s_dev *dev,
 		dev->play_dma_data.dt.addr = res->start + I2S_TXDMA;
 		dev->play_dma_data.dt.fifo_size = fifo_depth *
 			(fifo_width[idx2]) >> 8;
-		dev->play_dma_data.dt.maxburst = 16;
+		if (dev->quirks & DW_I2S_QUIRK_NOT_SUPPORT_BURST)
+			dev->play_dma_data.dt.maxburst = 1;
+		else
+			dev->play_dma_data.dt.maxburst = 16;
 	}
 	if (COMP1_RX_ENABLED(comp1)) 
{ 		idx2 = COMP2_RX_WORDSIZE_0(comp2);
@@ -722,7 +725,10 @@  static int dw_configure_dai_by_dt(struct dw_i2s_dev *dev,
 		dev->capture_dma_data.dt.addr = res->start + I2S_RXDMA;
 		dev->capture_dma_data.dt.fifo_size = fifo_depth *
 			(fifo_width[idx2] >> 8);
-		dev->capture_dma_data.dt.maxburst = 16;
+		if (dev->quirks & DW_I2S_QUIRK_NOT_SUPPORT_BURST)
+			dev->capture_dma_data.dt.maxburst = 1;
+		else
+			dev->capture_dma_data.dt.maxburst = 16;
 	}
 
 	return 0;
@@ -979,6 +985,8 @@  static int dw_i2s_probe(struct platform_device *pdev)
 		ret = dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
 	} else 
{ 		clk_id = "i2sclk";
+		if (of_get_property(pdev->dev.of_node, "not-support-burst", NULL))
+			dev->quirks |= DW_I2S_QUIRK_NOT_SUPPORT_BURST;
 		ret = dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
 	}
 	if (ret < 0)