linux-kernel - [PATCH v2] ASoC: rockchip: i2s: use regmap_read_poll_timeout to poll I2S

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Message-Id: <20220914031234.2250298-1-judyhsiao@chromium.org>
Date:   Wed, 14 Sep 2022 03:12:34 +0000
From:   Judy Hsiao <judyhsiao@...omium.org>
To:     Liam Girdwood <lgirdwood@...il.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Brian Norris <briannorris@...omium.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Chen-Yu Tsai <wenst@...omium.org>, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Judy Hsiao <judyhsiao@...omium.org>
Subject: [PATCH v2] ASoC: rockchip: i2s: use regmap_read_poll_timeout to poll I2S_CLR

Use regmap_read_poll_timeout to poll I2S_CLR.
It also fixes the 'rockchip-i2s ff070000.i2s; fail to clear' when
the read of I2S_CLR exceeds the retry limit.

Fixes: 0ff9f8b9f592 ("ASoC: rockchip: i2s: Fix error code when fail
to read I2S_CLR")
Signed-off-by: Judy Hsiao <judyhsiao@...omium.org>
Reviewed-by: Brian Norris <briannorris@...omium.org>
---

changes in v2:
  - Remove unused variables.
  - Refine debug messages.

 sound/soc/rockchip/rockchip_i2s.c | 41 ++++++++++++-------------------
 1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index f5f3540a9e18..28c86f5e435e 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -126,7 +126,6 @@ static inline struct rk_i2s_dev *to_info(struct snd_soc_dai *dai)
 static int rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
 {
 	unsigned int val = 0;
-	int retry = 10;
 	int ret = 0;
 
 	spin_lock(&i2s->lock);
@@ -163,18 +162,14 @@ static int rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
 						 I2S_CLR_TXC | I2S_CLR_RXC);
 			if (ret < 0)
 				goto end;
-			regmap_read(i2s->regmap, I2S_CLR, &val);
-
-			/* Should wait for clear operation to finish */
-			while (val) {
-				regmap_read(i2s->regmap, I2S_CLR, &val);
-				retry--;
-				if (!retry) {
-					dev_warn(i2s->dev, "fail to clear\n");
-					ret = -EBUSY;
-					break;
-				}
-			}
+			ret = regmap_read_poll_timeout(i2s->regmap,
+						       I2S_CLR,
+						       val,
+						       val != 0,
+						       20,
+						       200);
+			if (ret < 0)
+				dev_warn(i2s->dev, "fail to clear: %d\n", ret);
 		}
 	}
 end:
@@ -188,7 +183,6 @@ static int rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
 static int rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
 {
 	unsigned int val = 0;
-	int retry = 10;
 	int ret = 0;
 
 	spin_lock(&i2s->lock);
@@ -226,17 +220,14 @@ static int rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
 						 I2S_CLR_TXC | I2S_CLR_RXC);
 			if (ret < 0)
 				goto end;
-			regmap_read(i2s->regmap, I2S_CLR, &val);
-			/* Should wait for clear operation to finish */
-			while (val) {
-				regmap_read(i2s->regmap, I2S_CLR, &val);
-				retry--;
-				if (!retry) {
-					dev_warn(i2s->dev, "fail to clear\n");
-					ret = -EBUSY;
-					break;
-				}
-			}
+			ret = regmap_read_poll_timeout(i2s->regmap,
+						       I2S_CLR,
+						       val,
+						       val != 0,
+						       20,
+						       200);
+			if (ret < 0)
+				dev_warn(i2s->dev, "fail to clear: %d\n", ret);
 		}
 	}
 end:
-- 
2.37.2.789.g6183377224-goog