[PATCH 4.19 035/421] iio: ltr501: ltr559: fix initialization of LTR501_ALS_CONTR

[Greg Kroah-Hartman]

From: Oliver Lang <Oliver.Lang@xxxxxxxxxxxxxxxxxxx>

commit 421a26f3d7a7c3ca43f3a9dc0f3cb0f562d5bd95 upstream.

The ltr559 chip uses only the lowest bit of the ALS_CONTR register to
configure between active and stand-by mode. In the original driver
BIT(1) is used, which does a software reset instead.

This patch fixes the problem by using BIT(0) as als_mode_active for
the ltr559 chip.

Fixes: 8592a7eefa54 ("iio: ltr501: Add support for ltr559 chip")
Signed-off-by: Oliver Lang <Oliver.Lang@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Tested-by: Nikita Travkin <nikita@xxxxxxx> # ltr559
Link: https://lore.kernel.org/r/20210610134619.2101372-3-mkl@xxxxxxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/iio/light/ltr501.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/light/ltr501.c
+++ b/drivers/iio/light/ltr501.c
@@ -1210,7 +1210,7 @@ static struct ltr501_chip_info ltr501_ch
 		.als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),
 		.ps_gain = ltr559_ps_gain_tbl,
 		.ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl),
-		.als_mode_active = BIT(1),
+		.als_mode_active = BIT(0),
 		.als_gain_mask = BIT(2) | BIT(3) | BIT(4),
 		.als_gain_shift = 2,
 		.info = &ltr501_info,