soundwire: bus: use sdw_update_no_pm when initializing a device

When a Slave device is resumed, it may resume the bus and restart the
enumeration. During that process, we absolutely don't want to call
regular read/write routines which will wait for the resume to
complete, otherwise a deadlock occurs.

Fixes: 60ee9be255 ('soundwire: bus: add PM/no-PM versions of read/write functions')
Signed-off-by: Pierre-Louis Bossart <[email protected]>
Reviewed-by: Rander Wang <[email protected]>
Signed-off-by: Bard Liao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

drivers/soundwire/bus.c

@@ -491,6 +491,18 @@ sdw_read_no_pm(struct sdw_slave *slave, u32 addr)
 		return buf;
 }
 
+static int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
+{
+	int tmp;
+
+	tmp = sdw_read_no_pm(slave, addr);
+	if (tmp < 0)
+		return tmp;
+
+	tmp = (tmp & ~mask) | val;
+	return sdw_write_no_pm(slave, addr, tmp);
+}
+
 /**
  * sdw_nread() - Read "n" contiguous SDW Slave registers
  * @slave: SDW Slave
@@ -1254,7 +1266,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave)
 	val = slave->prop.scp_int1_mask;
 
 	/* Enable SCP interrupts */
-	ret = sdw_update(slave, SDW_SCP_INTMASK1, val, val);
+	ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val);
 	if (ret < 0) {
 		dev_err(slave->bus->dev,
 			"SDW_SCP_INTMASK1 write failed:%d\n", ret);
@@ -1269,7 +1281,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave)
 	val = prop->dp0_prop->imp_def_interrupts;
 	val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
 
-	ret = sdw_update(slave, SDW_DP0_INTMASK, val, val);
+	ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val);
 	if (ret < 0)
 		dev_err(slave->bus->dev,
 			"SDW_DP0_INTMASK read failed:%d\n", ret);