linux-kernel - [PATCH 1/2] iio: dac: adi-axi-dac: use unique bus free check

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Message-Id: <20250408-ad3552r-fix-bus-read-v1-1-37add66aeb08@baylibre.com>
Date: Tue, 08 Apr 2025 22:49:00 +0200
From: Angelo Dureghello <adureghello@...libre.com>
To: Nuno Sa <nuno.sa@...log.com>, Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
 Andy Shevchenko <andy@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH 1/2] iio: dac: adi-axi-dac: use unique bus free check

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

Use a unique function for the bus free check by polling, to reduce
duplicated code. An error is always thrown in case of timeout.

Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
 drivers/iio/dac/adi-axi-dac.c | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index 8ed5ad1fa24cef649056bc5f4ca80abbf28b9323..91557aa6797a3478de3607e5733c162d7745a3b2 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -635,15 +635,26 @@ static int axi_dac_ddr_disable(struct iio_backend *back)
 			       AXI_DAC_CNTRL_2_SDR_DDR_N);
 }
 
+static int axi_dac_wait_bus_free(struct axi_dac_state *st)
+{
+	u32 val;
+	int ret;
+
+	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 == -ETIMEDOUT)
+		dev_err(st->dev, "AXI bus timeout\n");
+
+	return ret;
+}
+
 static int axi_dac_data_stream_enable(struct iio_backend *back)
 {
 	struct axi_dac_state *st = iio_backend_get_priv(back);
-	int ret, val;
+	int ret;
 
-	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);
+	ret = axi_dac_wait_bus_free(st);
 	if (ret)
 		return ret;
 
@@ -734,12 +745,9 @@ static int __axi_dac_bus_reg_write(struct iio_backend *back, u32 reg,
 	if (ret)
 		return ret;
 
-	ret = regmap_read_poll_timeout(st->regmap,
-				AXI_DAC_UI_STATUS_REG, ival,
-				FIELD_GET(AXI_DAC_UI_STATUS_IF_BUSY, ival) == 0,
-				10, 100 * KILO);
-	if (ret == -ETIMEDOUT)
-		dev_err(st->dev, "AXI read timeout\n");
+	ret = axi_dac_wait_bus_free(st);
+	if (ret)
+		return ret;
 
 	/* Cleaning always AXI_DAC_CUSTOM_CTRL_TRANSFER_DATA */
 	return regmap_clear_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG,
@@ -779,7 +787,7 @@ static int axi_dac_bus_set_io_mode(struct iio_backend *back,
 				   enum ad3552r_io_mode mode)
 {
 	struct axi_dac_state *st = iio_backend_get_priv(back);
-	int ival, ret;
+	int ret;
 
 	if (mode > AD3552R_IO_MODE_QSPI)
 		return -EINVAL;
@@ -792,9 +800,7 @@ static int axi_dac_bus_set_io_mode(struct iio_backend *back,
 	if (ret)
 		return ret;
 
-	return regmap_read_poll_timeout(st->regmap, AXI_DAC_UI_STATUS_REG, ival,
-			FIELD_GET(AXI_DAC_UI_STATUS_IF_BUSY, ival) == 0, 10,
-			100 * KILO);
+	return axi_dac_wait_bus_free(st);
 }
 
 static void axi_dac_child_remove(void *data)

-- 
2.49.0