linux-kernel - [PATCH v1] ASoC: rockchip: i2s: use regmap_read_poll_timeout to poll I2S

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Message-Id: <20220908151142.1479810-1-judyhsiao@chromium.org>
Date:   Thu,  8 Sep 2022 15:11:42 +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 v1] 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' and
return -EBUSY 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>
---
 sound/soc/rockchip/rockchip_i2s.c | 39 +++++++++++++------------------
 1 file changed, 16 insertions(+), 23 deletions(-)

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index f5f3540a9e18..02905eec615e 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -163,18 +163,14 @@ 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\n");
 		}
 	}
 end:
@@ -226,17 +222,14 @@ 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\n");
 		}
 	}
 end:
-- 
2.37.2.789.g6183377224-goog