soundwire: bus: demote UNATTACHED state warnings to dev_dbg()

The dev_warn() messages in sdw_handle_slave_status() for UNATTACHED
transitions were added in commit d1b3285 ("soundwire: bus: add
dev_warn() messages to track UNATTACHED devices") to debug attachment
failures with dynamic debug enabled.

These warnings fire during normal operation -- for example when a codec
driver triggers a hardware reset after firmware download, causing the
device to momentarily go UNATTACHED before re-attaching -- producing
misleading noise on every boot.

Demote the messages to dev_dbg() so they remain available via dynamic
debug for diagnosing real attachment failures without alarming users
during expected initialization sequences.

Fixes: d1b3285 ("soundwire: bus: add dev_warn() messages to track UNATTACHED devices")
Signed-off-by: Cole Leavitt <cole@unwrap.rs>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20260218180210.9263-1-cole@unwrap.rs
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: coleleavitt

drivers/soundwire/bus.c

@@ -1899,8 +1899,8 @@ int sdw_handle_slave_status(struct sdw_bus *bus,
 
 		if (status[i] == SDW_SLAVE_UNATTACHED &&
 		    slave->status != SDW_SLAVE_UNATTACHED) {
-			dev_warn(&slave->dev, "Slave %d state check1: UNATTACHED, status was %d\n",
-				 i, slave->status);
+			dev_dbg(&slave->dev, "Slave %d state check1: UNATTACHED, status was %d\n",
+			i, slave->status);
 			sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
 
 			/* Ensure driver knows that peripheral unattached */
@@ -1951,8 +1951,8 @@ int sdw_handle_slave_status(struct sdw_bus *bus,
 			if (slave->status == SDW_SLAVE_UNATTACHED)
 				break;
 
-			dev_warn(&slave->dev, "Slave %d state check2: UNATTACHED, status was %d\n",
-				 i, slave->status);
+			dev_dbg(&slave->dev, "Slave %d state check2: UNATTACHED, status was %d\n",
+			i, slave->status);
 
 			sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
 			break;