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[v3,3/6] adc: meson-saradc: skip hardware init only if ADC is enabled

Message ID 20201216075158.16458-4-m.szyprowski@samsung.com
State Accepted
Commit 81b1c4759619777b55ad810cd89ccb421e02d33d
Headers show
Series VIM3: add support for checking 'Function' button state | expand

Commit Message

Marek Szyprowski Dec. 16, 2020, 7:51 a.m. UTC 
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(-)

-- 
2.17.1
diff mbox series

Patch

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);