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Subject[PATCH 1/1] usb: dwc2: platform: adopt dev_err_probe() to silent probe defer
Date
In case of probe defer, a message is logged for resets and clocks. Use
dev_err_probe to log the message only when error code is not -517.
Simplify phy, regulators and drd probe defer handling with dev_err_probe().
Then, take benefit of devices_deferred debugfs in case of probe deferral.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
---
drivers/usb/dwc2/platform.c | 53 +++++++++++--------------------------
1 file changed, 16 insertions(+), 37 deletions(-)

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index c8f18f3ba9e3..a1feaa09be57 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -222,20 +222,16 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
int i, ret;

hsotg->reset = devm_reset_control_get_optional(hsotg->dev, "dwc2");
- if (IS_ERR(hsotg->reset)) {
- ret = PTR_ERR(hsotg->reset);
- dev_err(hsotg->dev, "error getting reset control %d\n", ret);
- return ret;
- }
+ if (IS_ERR(hsotg->reset))
+ return dev_err_probe(hsotg->dev, PTR_ERR(hsotg->reset),
+ "error getting reset control\n");

reset_control_deassert(hsotg->reset);

hsotg->reset_ecc = devm_reset_control_get_optional(hsotg->dev, "dwc2-ecc");
- if (IS_ERR(hsotg->reset_ecc)) {
- ret = PTR_ERR(hsotg->reset_ecc);
- dev_err(hsotg->dev, "error getting reset control for ecc %d\n", ret);
- return ret;
- }
+ if (IS_ERR(hsotg->reset_ecc))
+ return dev_err_probe(hsotg->dev, PTR_ERR(hsotg->reset_ecc),
+ "error getting reset control for ecc\n");

reset_control_deassert(hsotg->reset_ecc);

@@ -251,11 +247,8 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
case -ENOSYS:
hsotg->phy = NULL;
break;
- case -EPROBE_DEFER:
- return ret;
default:
- dev_err(hsotg->dev, "error getting phy %d\n", ret);
- return ret;
+ return dev_err_probe(hsotg->dev, ret, "error getting phy\n");
}
}

@@ -268,12 +261,8 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
case -ENXIO:
hsotg->uphy = NULL;
break;
- case -EPROBE_DEFER:
- return ret;
default:
- dev_err(hsotg->dev, "error getting usb phy %d\n",
- ret);
- return ret;
+ return dev_err_probe(hsotg->dev, ret, "error getting usb phy\n");
}
}
}
@@ -282,10 +271,8 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)

/* Clock */
hsotg->clk = devm_clk_get_optional(hsotg->dev, "otg");
- if (IS_ERR(hsotg->clk)) {
- dev_err(hsotg->dev, "cannot get otg clock\n");
- return PTR_ERR(hsotg->clk);
- }
+ if (IS_ERR(hsotg->clk))
+ return dev_err_probe(hsotg->dev, PTR_ERR(hsotg->clk), "cannot get otg clock\n");

/* Regulators */
for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
@@ -293,12 +280,9 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)

ret = devm_regulator_bulk_get(hsotg->dev, ARRAY_SIZE(hsotg->supplies),
hsotg->supplies);
- if (ret) {
- if (ret != -EPROBE_DEFER)
- dev_err(hsotg->dev, "failed to request supplies: %d\n",
- ret);
- return ret;
- }
+ if (ret)
+ return dev_err_probe(hsotg->dev, ret, "failed to request supplies\n");
+
return 0;
}

@@ -558,16 +542,12 @@ static int dwc2_driver_probe(struct platform_device *dev)
hsotg->usb33d = devm_regulator_get(hsotg->dev, "usb33d");
if (IS_ERR(hsotg->usb33d)) {
retval = PTR_ERR(hsotg->usb33d);
- if (retval != -EPROBE_DEFER)
- dev_err(hsotg->dev,
- "failed to request usb33d supply: %d\n",
- retval);
+ dev_err_probe(hsotg->dev, retval, "failed to request usb33d supply\n");
goto error;
}
retval = regulator_enable(hsotg->usb33d);
if (retval) {
- dev_err(hsotg->dev,
- "failed to enable usb33d supply: %d\n", retval);
+ dev_err_probe(hsotg->dev, retval, "failed to enable usb33d supply\n");
goto error;
}

@@ -579,8 +559,7 @@ static int dwc2_driver_probe(struct platform_device *dev)

retval = dwc2_drd_init(hsotg);
if (retval) {
- if (retval != -EPROBE_DEFER)
- dev_err(hsotg->dev, "failed to initialize dual-role\n");
+ dev_err_probe(hsotg->dev, retval, "failed to initialize dual-role\n");
goto error_init;
}

--
2.25.1
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