linux-kernel - [PATCH v1 8/8] ASoC: cs35l41: Detect CSPL errors when sending CSPL commands

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Date:   Thu, 26 Oct 2023 16:05:58 +0100
From:   Stefan Binding <sbinding@...nsource.cirrus.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        "Mark Brown" <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <linux-sound@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        "Stefan Binding" <sbinding@...nsource.cirrus.com>
Subject: [PATCH v1 8/8] ASoC: cs35l41: Detect CSPL errors when sending CSPL commands

The existing code checks for the correct state transition after sending
a command. However, it is possible for the message box to return -1,
which indicates an error, if an error has occurred in the firmware.
We can detect if the error has occurred, and return a different error.
In addition, there is no recovering from a CSPL error, so the retry
mechanism is not needed in this case, and we can return immediately.

Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
---
 include/sound/cs35l41.h        | 2 ++
 sound/soc/codecs/cs35l41-lib.c | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/include/sound/cs35l41.h b/include/sound/cs35l41.h
index 80df80fe31e2..043f8ac65dbf 100644
--- a/include/sound/cs35l41.h
+++ b/include/sound/cs35l41.h
@@ -816,6 +816,8 @@ struct cs35l41_otp_map_element_t {
 };
 
 enum cs35l41_cspl_mbox_status {
+	CSPL_MBOX_STS_ERROR = U32_MAX,
+	CSPL_MBOX_STS_ERROR2 = 0x00ffffff, // firmware not always sign-extending 24-bit value
 	CSPL_MBOX_STS_RUNNING = 0,
 	CSPL_MBOX_STS_PAUSED = 1,
 	CSPL_MBOX_STS_RDY_FOR_REINIT = 2,
diff --git a/sound/soc/codecs/cs35l41-lib.c b/sound/soc/codecs/cs35l41-lib.c
index ddedb7e63cb6..4569e4f7cf7e 100644
--- a/sound/soc/codecs/cs35l41-lib.c
+++ b/sound/soc/codecs/cs35l41-lib.c
@@ -1474,6 +1474,11 @@ int cs35l41_set_cspl_mbox_cmd(struct device *dev, struct regmap *regmap,
 			continue;
 		}
 
+		if (sts == CSPL_MBOX_STS_ERROR || sts == CSPL_MBOX_STS_ERROR2) {
+			dev_err(dev, "CSPL Error Detected\n");
+			return -EINVAL;
+		}
+
 		if (!cs35l41_check_cspl_mbox_sts(cmd, sts))
 			dev_dbg(dev, "[%u] cmd %u returned invalid sts %u", i, cmd, sts);
 		else
-- 
2.34.1