[PATCH v2] drm: bridge: adv7511: use dev_err_probe in probe function

[Ahmad Fatoum]

adv7511 probe may need to be attempted multiple times before no
-EPROBE_DEFER is returned. Currently, every such probe results in
an error message:

[    4.534229] adv7511 1-003d: failed to find dsi host
[    4.580288] adv7511 1-003d: failed to find dsi host

This is misleading, as there is no error and probe deferral is normal
behavior. Fix this by using dev_err_probe that will suppress
-EPROBE_DEFER errors. While at it, we touch all dev_err in the probe
path. This makes the code more concise and included the error code
everywhere to aid user in debugging.

Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
v1 -> v2:
  - broke overly long lines (Laurent)
  - Added Laurent's Reviewed-by
---
 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c |  6 ++----
 drivers/gpu/drm/bridge/adv7511/adv7533.c     | 20 ++++++++------------
 2 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c 
b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index 1c37779b434a..4148b6d6f151 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -1229,10 +1229,8 @@ static int adv7511_probe(struct i2c_client *i2c, const 
struct i2c_device_id *id)
                return ret;
 
        ret = adv7511_init_regulators(adv7511);
-       if (ret) {
-               dev_err(dev, "failed to init regulators\n");
-               return ret;
-       }
+       if (ret)
+               return dev_err_probe(dev, ret, "failed to init regulators\n");
 
        /*
         * The power down GPIO is optional. If present, toggle it from active to
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c 
b/drivers/gpu/drm/bridge/adv7511/adv7533.c
index ef6270806d1d..9b73a606ec57 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
@@ -148,16 +148,14 @@ int adv7533_attach_dsi(struct adv7511 *adv)
                                                 };
 
        host = of_find_mipi_dsi_host_by_node(adv->host_node);
-       if (!host) {
-               dev_err(dev, "failed to find dsi host\n");
-               return -EPROBE_DEFER;
-       }
+       if (!host)
+               return dev_err_probe(dev, -EPROBE_DEFER,
+                                    "failed to find dsi host\n");
 
        dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
-       if (IS_ERR(dsi)) {
-               dev_err(dev, "failed to create dsi device\n");
-               return PTR_ERR(dsi);
-       }
+       if (IS_ERR(dsi))
+               return dev_err_probe(dev, PTR_ERR(dsi),
+                                    "failed to create dsi device\n");
 
        adv->dsi = dsi;
 
@@ -167,10 +165,8 @@ int adv7533_attach_dsi(struct adv7511 *adv)
                          MIPI_DSI_MODE_NO_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
 
        ret = devm_mipi_dsi_attach(dev, dsi);
-       if (ret < 0) {
-               dev_err(dev, "failed to attach dsi to host\n");
-               return ret;
-       }
+       if (ret < 0)
+               return dev_err_probe(dev, ret, "failed to attach dsi to 
host\n");
 
        return 0;
 }
-- 
2.30.2