linux-kernel - [PATCH v9 10/11] drm/bridge: ti-sn65dsi86: Improve probe errors with dev_err

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Message-Id: <20210607100234.v9.10.I24bba069e63b1eea84443eef0c8535fd032a6311@changeid>
Date:   Mon,  7 Jun 2021 10:05:54 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Sam Ravnborg <sam@...nborg.org>
Cc:     Linus W <linus.walleij@...aro.org>, robdclark@...omium.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        Steev Klimaszewski <steev@...i.org>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Thierry Reding <treding@...dia.com>,
        Lyude Paul <lyude@...hat.com>, dri-devel@...ts.freedesktop.org,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Robert Foss <robert.foss@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v9 10/11] drm/bridge: ti-sn65dsi86: Improve probe errors with dev_err_probe()

As I was testing to make sure that the DEFER path worked well with my
patch series, I got tired of seeing this scary message in my logs just
because the panel needed to defer:
  [drm:ti_sn_bridge_probe] *ERROR* could not find any panel node

Let's use dev_err_probe() which nicely quiets this error and also
simplifies the code a tiny bit. We'll also update other places in the
file which can use dev_err_probe().

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v9:
- ("Improve probe errors") patch new for v9.

 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 31 +++++++++++----------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index b544cbce7fdd..5d712c8c3c3b 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -1305,10 +1305,9 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev,
 	int ret;
 
 	ret = drm_of_find_panel_or_bridge(np, 1, 0, &pdata->panel, NULL);
-	if (ret) {
-		DRM_ERROR("could not find any panel node\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(&adev->dev, ret,
+				     "could not find any panel node\n");
 
 	ti_sn_bridge_parse_lanes(pdata, np);
 
@@ -1456,27 +1455,23 @@ static int ti_sn65dsi86_probe(struct i2c_client *client,
 
 	pdata->regmap = devm_regmap_init_i2c(client,
 					     &ti_sn65dsi86_regmap_config);
-	if (IS_ERR(pdata->regmap)) {
-		DRM_ERROR("regmap i2c init failed\n");
-		return PTR_ERR(pdata->regmap);
-	}
+	if (IS_ERR(pdata->regmap))
+		return dev_err_probe(dev, PTR_ERR(pdata->regmap),
+				     "regmap i2c init failed\n");
 
 	pdata->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
-	if (IS_ERR(pdata->enable_gpio)) {
-		DRM_ERROR("failed to get enable gpio from DT\n");
-		ret = PTR_ERR(pdata->enable_gpio);
-		return ret;
-	}
+	if (IS_ERR(pdata->enable_gpio))
+		return dev_err_probe(dev, PTR_ERR(pdata->enable_gpio),
+				     "failed to get enable gpio from DT\n");
 
 	ret = ti_sn65dsi86_parse_regulators(pdata);
-	if (ret) {
-		DRM_ERROR("failed to parse regulators\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to parse regulators\n");
 
 	pdata->refclk = devm_clk_get_optional(dev, "refclk");
 	if (IS_ERR(pdata->refclk))
-		return PTR_ERR(pdata->refclk);
+		return dev_err_probe(dev, PTR_ERR(pdata->refclk),
+				     "failed to get reference clock\n");
 
 	pm_runtime_enable(dev);
 	ret = devm_add_action_or_reset(dev, ti_sn65dsi86_runtime_disable, dev);
-- 
2.32.0.rc1.229.g3e70b5a671-goog