From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Fri, 8 Dec 2017 18:41:49 +0100
Subject: iio: adc: ina2xx: Do not udelay for several seconds
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Git-commit: 8bcf024f06f11c0c9597ecbbfbe291a9a5092204
Patch-mainline: v4.16-rc1
References: fate#326530,fate#326531,fate#326535,fate#326538,fate#326539
The conversion time can be up to 16 seconds (8 ms per channel, 2 channels,
1024 times averaging).
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/iio/adc/ina2xx-adc.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index b027d485398b..2621a34ee5c6 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -764,7 +764,7 @@ static int ina2xx_capture_thread(void *data)
struct iio_dev *indio_dev = data;
struct ina2xx_chip_info *chip = iio_priv(indio_dev);
int sampling_us = SAMPLING_PERIOD(chip);
- int buffer_us;
+ int buffer_us, delay_us;
/*
* Poll a bit faster than the chip internal Fs, in case
@@ -778,8 +778,10 @@ static int ina2xx_capture_thread(void *data)
if (buffer_us < 0)
return buffer_us;
- if (sampling_us > buffer_us)
- udelay(sampling_us - buffer_us);
+ if (sampling_us > buffer_us) {
+ delay_us = sampling_us - buffer_us;
+ usleep_range(delay_us, (delay_us * 3) >> 1);
+ }
} while (!kthread_should_stop());
--
2.11.0