From fee8abc3bcb1fc34370cb3595d9c474b2d25a6b3 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Thu, 22 Oct 2015 01:09:30 +0300 Subject: [PATCH] drm: rcar-du: Add probe deferral debug messages Print a message when the HDMI I2C slave encoder can't be found to help debugging probe deferral issues. Signed-off-by: Laurent Pinchart --- drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c b/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c index 065b3a1d6134..461662d231e2 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c @@ -131,12 +131,19 @@ int rcar_du_hdmienc_init(struct rcar_du_device *rcdu, /* Locate the slave I2C device and driver. */ i2c_slave = of_find_i2c_device_by_node(np); - if (!i2c_slave || !i2c_get_clientdata(i2c_slave)) + if (!i2c_slave || !i2c_get_clientdata(i2c_slave)) { + dev_dbg(rcdu->dev, + "can't get I2C slave for %s, deferring probe\n", + of_node_full_name(np)); return -EPROBE_DEFER; + } hdmienc->dev = &i2c_slave->dev; if (hdmienc->dev->driver == NULL) { + dev_dbg(rcdu->dev, + "I2C slave %s not probed yet, deferring probe\n", + dev_name(hdmienc->dev)); ret = -EPROBE_DEFER; goto error; } -- 2.20.1