ALSA: hda: cs35l41: Check CSPL state after loading firmware

CSPL firmware should be in RUNNING or PAUSED state after loading.
If not, the firmware has not been loaded correctly, and we can unload
it and pass the error up.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20231026150558.2105827-8-sbinding@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: Stefan Binding

sound/pci/hda/cs35l41_hda.c

@@ -994,6 +994,7 @@ static int cs35l41_runtime_resume(struct device *dev)
 
 static int cs35l41_smart_amp(struct cs35l41_hda *cs35l41)
 {
+	unsigned int fw_status;
 	__be32 halo_sts;
 	int ret;
 
@@ -1027,6 +1028,23 @@ static int cs35l41_smart_amp(struct cs35l41_hda *cs35l41)
 		goto clean_dsp;
 	}
 
+	ret = regmap_read(cs35l41->regmap, CS35L41_DSP_MBOX_2, &fw_status);
+	if (ret < 0) {
+		dev_err(cs35l41->dev,
+			"Failed to read firmware status: %d\n", ret);
+		goto clean_dsp;
+	}
+
+	switch (fw_status) {
+	case CSPL_MBOX_STS_RUNNING:
+	case CSPL_MBOX_STS_PAUSED:
+		break;
+	default:
+		dev_err(cs35l41->dev, "Firmware status is invalid: %u\n",
+			fw_status);
+		goto clean_dsp;
+	}
+
 	ret = cs35l41_set_cspl_mbox_cmd(cs35l41->dev, cs35l41->regmap, CSPL_MBOX_CMD_PAUSE);
 	if (ret) {
 		dev_err(cs35l41->dev, "Error waiting for DSP to pause: %u\n", ret);