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    Subject[PATCH 13/15] iio: ti_am335x_adc: Fix capture operation during resume
    Date
    From: Russ Dill <Russ.Dill@ti.com>

    The ADC needs to go through a proper initialization sequence after
    resuming from suspend.

    Signed-off-by: Russ Dill <Russ.Dill@ti.com>
    Signed-off-by: Zubair Lutfullah <zubair.lutfullah@gmail.com>
    ---
    drivers/iio/adc/ti_am335x_adc.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
    index 44b7181..265ed27 100644
    --- a/drivers/iio/adc/ti_am335x_adc.c
    +++ b/drivers/iio/adc/ti_am335x_adc.c
    @@ -552,11 +552,14 @@ static int tiadc_resume(struct device *dev)
    struct tiadc_device *adc_dev = iio_priv(indio_dev);
    unsigned int restore;

    + restore = tiadc_readl(adc_dev, REG_CTRL);
    + restore &= ~(CNTRLREG_TSCSSENB);
    + tiadc_writel(adc_dev, REG_CTRL, restore);
    tiadc_writel(adc_dev, REG_FIFO1THR, FIFO1_THRESHOLD);
    tiadc_step_config(adc_dev, adc_dev->is_continuous_mode);
    /* Make sure ADC is powered up */
    - restore = tiadc_readl(adc_dev, REG_CTRL);
    restore &= ~(CNTRLREG_POWERDOWN);
    + restore |= CNTRLREG_TSCSSENB;
    tiadc_writel(adc_dev, REG_CTRL, restore);

    return 0;
    --
    1.7.9.5


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