soundwire: stream: don't abort bank switch on Command_Ignored/-ENODATA

This change is needed for support of mockup devices, which by
construction will not provide any answer to a bank switch, but it's
also legit for regular cases.

If for some reason a device loses sync and cannot handle a bank
switch, we should go ahead anyways. The devices can always resync
later.

The only case where the error flow should be used is when there is a
Command_Aborted composite answer from SoundWire devices.
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Link: https://lore.kernel.org/r/20210714032209.11284-6-yung-chuan.liao@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/stream.c

@@ -697,7 +697,7 @@ static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
 	else
 		ret = sdw_transfer(bus, wr_msg);
 
-	if (ret < 0) {
+	if (ret < 0 && ret != -ENODATA) {
 		dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
 		goto error;
 	}