soundwire: cadence_master: set data_per_frame as frame capability

data_per_frame will be used for preparing the TX buffer and we may add
some fake frames to ensure the data in the buffer will be flushed.
So that it should indicate the frame capability even if the required
data bytes are less than the frame capability.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://patch.msgid.link/20251014031450.3781789-4-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: bardliao

drivers/soundwire/cadence_master.c

@@ -2114,9 +2114,6 @@ int sdw_cdns_bpt_find_buffer_sizes(int command, /* 0: write, 1: read */
 	if (!actual_bpt_bytes)
 		return -EINVAL;
 
-	if (data_bytes < actual_bpt_bytes)
-		actual_bpt_bytes = data_bytes;
-
 	/*
 	 * the caller may want to set the number of bytes per frame,
 	 * allow when possible
@@ -2126,6 +2123,9 @@ int sdw_cdns_bpt_find_buffer_sizes(int command, /* 0: write, 1: read */
 
 	*data_per_frame = actual_bpt_bytes;
 
+	if (data_bytes < actual_bpt_bytes)
+		actual_bpt_bytes = data_bytes;
+
 	if (command == 0) {
 		/*
 		 * for writes we need to send all the data_bytes per frame,