soundwire: introduce BPT section

Currently we send a BRA message with a start address with continuous
registers in a BPT stream. However, a codec may need to write different
register sections shortly. Introduce a register section in struct
sdw_btp_msg which contain register start address, length, and buffer.
This commit uses only 1 section for each BPT message. And we need to add
up all BPT section length and check if it reach maximum BPT bytes.
No function changes.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Tested-by: Shuming Fan <shumingf@realtek.com>
Link: https://patch.msgid.link/20251021094355.132943-2-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/soundwire/debugfs.c b/drivers/soundwire/debugfs.c
index 1e0f9318b616..6068011dd0d9 100644
--- a/drivers/soundwire/debugfs.c
+++ b/drivers/soundwire/debugfs.c
@@ -222,15 +222,23 @@ DEFINE_DEBUGFS_ATTRIBUTE(set_num_bytes_fops, NULL,
 static int do_bpt_sequence(struct sdw_slave *slave, bool write, u8 *buffer)
 {
 	struct sdw_bpt_msg msg = {0};
+	struct sdw_bpt_section *sec;
 
-	msg.addr = start_addr;
-	msg.len = num_bytes;
+	sec = kcalloc(1, sizeof(*sec), GFP_KERNEL);
+	if (!sec)
+		return -ENOMEM;
+	msg.sections = 1;
+
+	sec[0].addr = start_addr;
+	sec[0].len = num_bytes;
+
+	msg.sec = sec;
 	msg.dev_num = slave->dev_num;
 	if (write)
 		msg.flags = SDW_MSG_FLAG_WRITE;
 	else
 		msg.flags = SDW_MSG_FLAG_READ;
-	msg.buf = buffer;
+	sec[0].buf = buffer;
 
 	return sdw_bpt_send_sync(slave->bus, slave, &msg);
 }