linux-kernel - [RFC PATCH 19/40] soundwire: bus: improve dynamic debug comments for enumeration

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Message-Id: <20190725234032.21152-20-pierre-louis.bossart@linux.intel.com>
Date:   Thu, 25 Jul 2019 18:40:11 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, tiwai@...e.de, broonie@...nel.org,
        vkoul@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: [RFC PATCH 19/40] 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@...ux.intel.com>
---
 drivers/soundwire/bus.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index bca378806d00..2354675ef104 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -483,7 +483,8 @@ 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;
 	}
 
@@ -540,6 +541,7 @@ 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;
 		}
@@ -982,6 +984,7 @@ int sdw_handle_slave_status(struct sdw_bus *bus,
 	int i, ret = 0;
 
 	if (status[0] == SDW_SLAVE_ATTACHED) {
+		dev_err(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);
-- 
2.20.1