linux-kernel - [PATCH 3/8] iio: dac: adi-axi-dac: modify stream enable

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Message-Id: <20241216-wip-bl-ad3552r-axi-v0-iio-testing-carlos-v1-3-856ff71fc930@baylibre.com>
Date: Mon, 16 Dec 2024 21:36:23 +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>, 
 Mihail Chindris <mihail.chindris@...log.com>, Nuno Sa <nuno.sa@...log.com>, 
 David Lechner <dlechner@...libre.com>, 
 Olivier Moysan <olivier.moysan@...s.st.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 3/8] 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 | 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