From: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
Change suggested from the AXI HDL team, modify the function
axi_dac_data_stream_enable() to check for interface busy, to avoid
possible issues when starting the stream.
Fixes: e61d7178429a ("iio: dac: adi-axi-dac: extend features")
Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
---
drivers/iio/dac/adi-axi-dac.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index b143f7ed6847..d02eb535b648 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -585,6 +585,17 @@ static int axi_dac_ddr_disable(struct iio_backend *back)
static int axi_dac_data_stream_enable(struct iio_backend *back)
{
struct axi_dac_state *st = iio_backend_get_priv(back);
+ int ret, val;
+
+ ret = regmap_read_poll_timeout(st->regmap,
+ AXI_DAC_UI_STATUS_REG, val,
+ FIELD_GET(AXI_DAC_UI_STATUS_IF_BUSY, val) == 0,
+ 10, 100 * KILO);
+ if (ret) {
+ if (ret == -ETIMEDOUT)
+ dev_err(st->dev, "AXI read timeout\n");
+ return ret;
+ }
return regmap_set_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG,
AXI_DAC_CUSTOM_CTRL_STREAM_ENABLE);
--
2.47.0
