The driver skips hardware initialization if it is already configured by the earlier bootloader stage (BL30). Skip the initialization only if the hardware is really initialized and enabled.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com Reviewed-by: Neil Armstrong narmstrong@baylibre.com Tested-by: Jaehoon Chung jh80.chung@samsung.com Reviewed-by: Jaehoon Chung jh80.chung@samsung.com --- drivers/adc/meson-saradc.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/adc/meson-saradc.c b/drivers/adc/meson-saradc.c index 998cef24d8..ce7ae990ad 100644 --- a/drivers/adc/meson-saradc.c +++ b/drivers/adc/meson-saradc.c @@ -512,8 +512,11 @@ static int meson_saradc_init(struct meson_saradc_priv *priv) * reading the temperature sensor. */ regmap_read(priv->regmap, MESON_SAR_ADC_REG3, ®val); - if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED) - return 0; + if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED) { + regmap_read(priv->regmap, MESON_SAR_ADC_REG3, ®val); + if (regval & MESON_SAR_ADC_REG3_ADC_EN) + return 0; + }
meson_saradc_stop_sample_engine(priv);