linux-kernel - [PATCH] ASoC: cs35l56: Waiting for firmware to boot must be tolerant of I/O errors

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Date:   Tue, 29 Aug 2023 17:04:33 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH] ASoC: cs35l56: Waiting for firmware to boot must be tolerant of I/O errors

From: Simon Trimmer <simont@...nsource.cirrus.com>

Ignore failure to read from the cs35l56 when polling as the device will
NAK i2c accesses until it has booted and this would terminate the poll
of regmap_read_poll_timeout().

Fixes: 8a731fd37f8b ("ASoC: cs35l56: Move utility functions to shared file")
Signed-off-by: Simon Trimmer <simont@...nsource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 sound/soc/codecs/cs35l56-shared.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/sound/soc/codecs/cs35l56-shared.c b/sound/soc/codecs/cs35l56-shared.c
index ae373f335ea8..98b1e63360ae 100644
--- a/sound/soc/codecs/cs35l56-shared.c
+++ b/sound/soc/codecs/cs35l56-shared.c
@@ -243,26 +243,27 @@ int cs35l56_wait_for_firmware_boot(struct cs35l56_base *cs35l56_base)
 {
 	unsigned int reg;
 	unsigned int val;
-	int ret;
+	int read_ret, poll_ret;
 
 	if (cs35l56_base->rev < CS35L56_REVID_B0)
 		reg = CS35L56_DSP1_HALO_STATE_A1;
 	else
 		reg = CS35L56_DSP1_HALO_STATE;
 
-	ret = regmap_read_poll_timeout(cs35l56_base->regmap, reg,
-				       val,
-				       (val < 0xFFFF) && (val >= CS35L56_HALO_STATE_BOOT_DONE),
-				       CS35L56_HALO_STATE_POLL_US,
-				       CS35L56_HALO_STATE_TIMEOUT_US);
+	/*
+	 * This can't be a regmap_read_poll_timeout() because cs35l56 will NAK
+	 * I2C until it has booted which would terminate the poll
+	 */
+	poll_ret = read_poll_timeout(regmap_read, read_ret,
+				     (val < 0xFFFF) && (val >= CS35L56_HALO_STATE_BOOT_DONE),
+				     CS35L56_HALO_STATE_POLL_US,
+				     CS35L56_HALO_STATE_TIMEOUT_US,
+				     false,
+				     cs35l56_base->regmap, reg, &val);
 
-	if ((ret < 0) && (ret != -ETIMEDOUT)) {
-		dev_err(cs35l56_base->dev, "Failed to read HALO_STATE: %d\n", ret);
-		return ret;
-	}
-
-	if ((ret == -ETIMEDOUT) || (val != CS35L56_HALO_STATE_BOOT_DONE)) {
-		dev_err(cs35l56_base->dev, "Firmware boot fail: HALO_STATE=%#x\n", val);
+	if (poll_ret) {
+		dev_err(cs35l56_base->dev, "Firmware boot timed out(%d): HALO_STATE=%#x\n",
+			read_ret, val);
 		return -EIO;
 	}
 
-- 
2.30.2