[Letux-kernel] [PATCH] iio: palmas: shut up warning about calibration mismatch (due to noise)

H. Nikolaus Schaller hns at goldelico.com
Tue Mar 8 13:53:03 CET 2022


Although technically checking for ADC values below 0 is correct,
because they are outside of the calibration values, there is usually
noise which spuriously fills the console log with error messages if
calculated input voltage gets close to 0V.

Ignore small negative calculated values, but clamp them to 0.

Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
---
 drivers/iio/adc/palmas_gpadc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index f9c8385c72d3..bcfa6a7f6cb2 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -376,7 +376,8 @@ static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
 					adc->adc_info[adc_chan].gain_error;
 
 	if (val < 0) {
-		dev_err(adc->dev, "Mismatch with calibration\n");
+		if (val < -10)
+			dev_err(adc->dev, "Mismatch with calibration var = %d\n", val);
 		return 0;
 	}
 
-- 
2.33.0



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