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    Subject[PATCH 5.5 069/119] iio: light: vcnl4000: update sampling periods for vcnl4200
    Date
    From: Tomas Novotny <tomas@novotny.cz>

    commit b42aa97ed5f1169cfd37175ef388ea62ff2dcf43 upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/iio/light/vcnl4000.c | 8 ++++----
    1 file changed, 4 insertions(+), 4 deletions(-)

    --- a/drivers/iio/light/vcnl4000.c
    +++ b/drivers/iio/light/vcnl4000.c
    @@ -167,10 +167,10 @@ static int vcnl4200_init(struct vcnl4000
    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:

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