[PATCH 4/4] media: ipu-bridge: Improve error logging when waiting for IVSC to become ready

[Hans de Goede <hansg@kernel.org>]

From: Hans de Goede <hdegoede@redhat.com>

The ipu-bridge code waits for the IVSC to become ready (on platforms with
an IVSC chip).

It does this by returning -EPROBE_DEFER, but it does not use
dev_err_probe() so no reason for deferring gets registered.

After 30 seconds the kernel logs a warning that the probe is still
deferred, which looks like this:

[   33.951709] pci 0000:00:14.3: deferred probe pending: (reason unknown)

Use dev_err_probe() when returning -EPROBE_DEFER to register the probe
deferral reason changing the error to:

deferred probe pending: waiting for IVSC to become ready

to help with debugging why drivers are not binding if the iVSC does
not become ready for some reason.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/media/pci/intel/ipu-bridge.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/pci/intel/ipu-bridge.c b/drivers/media/pci/intel/ipu-bridge.c
index c80af394ce18..dbb847a104e0 100644
--- a/drivers/media/pci/intel/ipu-bridge.c
+++ b/drivers/media/pci/intel/ipu-bridge.c
@@ -811,7 +811,8 @@ int ipu_bridge_init(struct device *dev,
 		return 0;
 
 	if (!ipu_bridge_ivsc_is_ready())
-		return -EPROBE_DEFER;
+		return dev_err_probe(dev, -EPROBE_DEFER,
+				     "waiting for IVSC to become ready\n");
 
 	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
 	if (!bridge)
-- 
2.49.0