linux-kernel - [PATCH v3 3/9] iio: dac: adi-axi-dac: modify stream enable

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Message-Id: <20250110-wip-bl-ad3552r-axi-v0-iio-testing-carlos-v3-3-ab42aef0d840@baylibre.com>
Date: Fri, 10 Jan 2025 11:24:15 +0100
From: Angelo Dureghello <adureghello@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
 Nuno Sa <nuno.sa@...log.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v3 3/9] iio: dac: adi-axi-dac: modify stream enable

From: Angelo Dureghello <adureghello@...libre.com>

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@...libre.com>
---
 drivers/iio/dac/adi-axi-dac.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index b143f7ed6847..ac871deb8063 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -585,6 +585,14 @@ 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)
+		return ret;
 
 	return regmap_set_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG,
 			       AXI_DAC_CUSTOM_CTRL_STREAM_ENABLE);

-- 
2.47.0