From: Robert Hodaszi <robert.hodaszi@xxxxxxxx>
This patch does NOT apply to the 3.12 stable tree. If you still want
it applied, please provide a backport.
===============
commit 19bc4981a213d0c5b0e1e8b08815c0b26f01ec54 upstream.
All channels' single measurement are happening on CH 0. So enabling / disabling
the divider once is not enough, because it has impact on all channels.
Set only a flag, then check this on each measurement, and enable / disable the
divider as required.
Signed-off-by: Robert Hodaszi <robert.hodaszi@xxxxxxxx>
Cc: Stable@xxxxxxxxxxxxxxx
Acked-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Acked-by: Marek Vasut <marex@xxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
---
drivers/staging/iio/adc/mxs-lradc.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index dae8d1a9038e..52d7517b342e 100644
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -846,6 +846,14 @@ static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
LRADC_CTRL1);
mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0);
+ /* Enable / disable the divider per requirement */
+ if (test_bit(chan, &lradc->is_divided))
+ mxs_lradc_reg_set(lradc, 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
+ LRADC_CTRL2);
+ else
+ mxs_lradc_reg_clear(lradc,
+ 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, LRADC_CTRL2);
+
/* Clean the slot's previous content, then set new one. */
mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
LRADC_CTRL4);
@@ -961,15 +969,11 @@ static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
/* divider by two disabled */
- writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
- lradc->base + LRADC_CTRL2 + STMP_OFFSET_REG_CLR);
clear_bit(chan->channel, &lradc->is_divided);
ret = 0;
} else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
/* divider by two enabled */
- writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
- lradc->base + LRADC_CTRL2 + STMP_OFFSET_REG_SET);
set_bit(chan->channel, &lradc->is_divided);
ret = 0;
}
--
2.0.0
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