linux-kernel - [PATCH 08/15] iio: sx9310: Use regmap_read_poll

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Date:   Tue, 28 Jul 2020 09:12:51 -0600
From:   Daniel Campello <campello@...omium.org>
To:     LKML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Daniel Campello <campello@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enrico Granata <egranata@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Stephen Boyd <swboyd@...omium.org>, linux-iio@...r.kernel.org
Subject: [PATCH 08/15] iio: sx9310: Use regmap_read_poll_timeout() for compensation

Simplify compensation stage by using regmap_read_poll_timeout().

Signed-off-by: Daniel Campello <campello@...omium.org>
---

 drivers/iio/proximity/sx9310.c | 25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 2465064971d0a7..3956fd679c6db9 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -796,7 +796,7 @@ static const struct sx9310_reg_default sx9310_default_regs[] = {
 static int sx9310_init_compensation(struct iio_dev *indio_dev)
 {
 	struct sx9310_data *data = iio_priv(indio_dev);
-	int i, ret;
+	int ret;
 	unsigned int val;
 	unsigned int ctrl0;
 
@@ -810,22 +810,17 @@ static int sx9310_init_compensation(struct iio_dev *indio_dev)
 	if (ret < 0)
 		return ret;
 
-	for (i = 100; i >= 0; i--) {
-		msleep(20);
-		ret = regmap_read(data->regmap, SX9310_REG_STAT1, &val);
-		if (ret < 0)
-			goto out;
-		if (!(val & SX9310_COMPSTAT_MASK))
-			break;
-	}
-
-	if (i < 0) {
-		dev_err(&data->client->dev,
-			"initial compensation timed out: 0x%02x", val);
-		ret = -ETIMEDOUT;
+	ret = regmap_read_poll_timeout(data->regmap, SX9310_REG_STAT1, val,
+				       !(val & SX9310_REG_STAT1_COMPSTAT_MASK),
+				       20000, 2000000);
+	if (ret) {
+		if (ret == -ETIMEDOUT)
+			dev_err(&data->client->dev,
+				"0x02 << 3l compensation timed out: 0x%02x",
+				val);
+		return ret;
 	}
 
-out:
 	regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
 	return ret;
 }
-- 
2.28.0.rc0.142.g3c755180ce-goog