soundwire: bus: improve dynamic debug comments for enumeration

update comments to provide better understanding of enumeration flows.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190806005522.22642-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 49f64b2115b9..50f9cc5eb5f6 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -470,7 +470,8 @@ static int sdw_assign_device_num(struct sdw_slave *slave)
 
         ret = sdw_write(slave, SDW_SCP_DEVNUMBER, dev_num);
         if (ret < 0) {
-                dev_err(&slave->dev, "Program device_num failed: %d\n", ret);
+                dev_err(&slave->dev, "Program device_num %d failed: %d\n",
+                        dev_num, ret);
                 return ret;
         }
 
@@ -527,6 +528,7 @@ static int sdw_program_device_num(struct sdw_bus *bus)
         do {
                 ret = sdw_transfer(bus, &msg);
                 if (ret == -ENODATA) { /* end of device id reads */
+                        dev_dbg(bus->dev, "No more devices to enumerate\n");
                         ret = 0;
                         break;
                 }
@@ -969,6 +971,7 @@ int sdw_handle_slave_status(struct sdw_bus *bus,
         int i, ret = 0;
 
         if (status[0] == SDW_SLAVE_ATTACHED) {
+                dev_dbg(bus->dev, "Slave attached, programming device number\n");
                 ret = sdw_program_device_num(bus);
                 if (ret)
                         dev_err(bus->dev, "Slave attach failed: %d\n", ret);