6.15-stable review patch. If anyone has any objections, please let me know.
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From: Uwe Kleine-König u.kleine-koenig@baylibre.com
[ Upstream commit 8712e4986e7ce42a14c762c4c350f290989986a5 ]
The sinc4 filter has a factor 0.23 between Output Data Rate and f_{3dB} and for sinc3 the factor is 0.272 according to the data sheets for ad7124-4 (Rev. E.) and ad7124-8 (Rev. F).
Fixes: cef2760954cf ("iio: adc: ad7124: add 3db filter") Signed-off-by: Uwe Kleine-König u.kleine-koenig@baylibre.com Reviewed-by: Marcelo Schmitt marcelo.schmitt@analog.com Link: https://patch.msgid.link/20250317115247.3735016-6-u.kleine-koenig@baylibre.c... Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iio/adc/ad7124.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c index 3ea81a98e4553..7d5d84a07cae1 100644 --- a/drivers/iio/adc/ad7124.c +++ b/drivers/iio/adc/ad7124.c @@ -301,9 +301,9 @@ static int ad7124_get_3db_filter_freq(struct ad7124_state *st,
switch (st->channels[channel].cfg.filter_type) { case AD7124_SINC3_FILTER: - return DIV_ROUND_CLOSEST(fadc * 230, 1000); + return DIV_ROUND_CLOSEST(fadc * 272, 1000); case AD7124_SINC4_FILTER: - return DIV_ROUND_CLOSEST(fadc * 262, 1000); + return DIV_ROUND_CLOSEST(fadc * 230, 1000); default: return -EINVAL; }