From: Yiwei Cai <cain....@rock-chips.com>
Test with command -
arecord -D hw:0,0 /tmp/a.wav, there are the error dump:
dma-pl330 ffb20000.dma-controller: fill_queue:2251 Bad Desc(7)
This error is happening when no a multiple of burst size * burst
length are coming in. The root cause is pl330 dma controller on
Rockchips' platform cannot support DMAFLUSHP instruction which make
dma to flush the req of non-aligned or non-multiple of what we set
before. The saftest way is to set dma max burst to 1.
Signed-off-by: Yiwei Cai <cain....@rock-chips.com>
Fixes: 4495c89fc ("ASoC: add driver for Rockchip RK3xxx I2S")
Signed-off-by: Shawn Lin <shawn....@rock-chips.com>
cc: Addy Ke <addy...@rock-chips.com>
cc: Jianqun Xu <x...@rock-chips.com>
cc: Heiko Stuebner <he...@sntech.de>
cc: Olof Johansson <o...@lixom.net>
cc: Doug Anderson <diand...@chromium.org>
cc: Sonny Rao <sonny...@chromium.org>
cc: Mark Brown <broo...@kernel.org>
---
Changes in v5:
- use switch statement for dma_quirk's manipulation
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None
sound/soc/rockchip/rockchip_i2s.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/sound/soc/rockchip/rockchip_i2s.c
b/sound/soc/rockchip/rockchip_i2s.c
index acb5be5..543d0c0 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -23,6 +23,8 @@
#define DRV_NAME "rockchip-i2s"
+#define ROCKCHIP_I2S_BROKEN_BURST_LEN (1<<0) /* broken burst len */
+
struct rk_i2s_dev {
struct device *dev;
@@ -418,6 +420,7 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
struct rk_i2s_dev *i2s;
struct resource *res;
void __iomem *regs;
+ int dma_quirk;
int ret;
i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
@@ -489,6 +492,24 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
goto err_pcm_register;
}
+ dma_quirk = snd_dmaengine_pcm_get_quirks(&pdev->dev);
+ switch (dma_quirk) {
+ case ROCKCHIP_I2S_BROKEN_BURST_LEN:
+ /*
+ * Unfortunately, we find broken burst len here,
+ * just have to limit maxburst to ONE in order to avoid
+ * non-multiple burst len access fail the dmaengine if
+ * it can't support flush peripheral function.
+ */
+ i2s->playback_dma_data.maxburst = 1;
+ i2s->capture_dma_data.maxburst = 1;
+ break;
+ default:
+ dev_info(&pdev->dev, "Default no dma_quirk!\n");
+ break;
+ }
+
return 0;
err_pcm_register:
--
2.3.7
--
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