iio: adc: stm32: fix scan of multiple channels with DMA

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commit 04e491ca9d upstream.

By default, watermark is set to '1'. Watermark is used to fine tune
cyclic dma buffer period. In case watermark is left untouched (e.g. 1)
and several channels are being scanned, buffer period is wrongly set
(e.g. to 1 sample). As a consequence, data is never pushed to upper layer.
Fix buffer period size, by taking scan channels number into account.

Fixes: 2763ea0585 ("iio: adc: stm32: add optional dma support")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Fabrice Gasnier 2018-01-05 15:34:54 +01:00 • committed by Greg Kroah-Hartman

parent cfd96cbd60

commit e2d4cdb7b8

1 changed files with 2 additions and 1 deletions

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drivers/iio/adc/stm32-adc.c

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