iio: light: vcnl4000: update sampling periods for vcnl4200

Vishay has published a new version of "Designing the VCNL4200 Into an
Application" application note in October 2019. The new version specifies
that there is +-20% of part to part tolerance. This explains the drift
seen during experiments. The proximity pulse width is also changed from
32us to 30us. According to the support, the tolerance also applies to
ambient light.

So update the sampling periods. As the reading is blocking, current
users may notice slightly longer response time.

Fixes: be38866fbb97 ("iio: vcnl4000: add support for VCNL4200")
Reviewed-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Tomas Novotny <tomas@novotny.cz>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index b0e241aaefb48863c28f06235bdab3b3ac221fa7..98428bf430bdcc84d3dfe091e5bd05a77b30bee8 100644 (file)
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -167,10 +167,10 @@ static int vcnl4200_init(struct vcnl4000_data *data)
        data->vcnl4200_ps.reg = VCNL4200_PS_DATA;
        switch (id) {
        case VCNL4200_PROD_ID:
-               /* Integration time is 50ms, but the experiments */
-               /* show 54ms in total. */
-               data->vcnl4200_al.sampling_rate = ktime_set(0, 54000 * 1000);
-               data->vcnl4200_ps.sampling_rate = ktime_set(0, 4200 * 1000);
+               /* Default wait time is 50ms, add 20% tolerance. */
+               data->vcnl4200_al.sampling_rate = ktime_set(0, 60000 * 1000);
+               /* Default wait time is 4.8ms, add 20% tolerance. */
+               data->vcnl4200_ps.sampling_rate = ktime_set(0, 5760 * 1000);
                data->al_scale = 24000;
                break;
        case VCNL4040_PROD_ID: