From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Wed, 16 Dec 2020 07:51:55 +0000 (+0100)
Subject: adc: meson-saradc: skip hardware init only if ADC is enabled
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=81b1c4759619777b55ad810cd89ccb421e02d33d;p=u-boot.git

adc: meson-saradc: skip hardware init only if ADC is enabled

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>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---

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, &regval);
-	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, &regval);
+		if (regval & MESON_SAR_ADC_REG3_ADC_EN)
+			return 0;
+	}
 
 	meson_saradc_stop_sample_engine(priv);