linux-kernel - [PATCH 18/21] IIO: ti_adc: Fix capture operation during resume

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Message-Id: <1374082010-28095-19-git-send-email-zubair.lutfullah@gmail.com>
Date:	Wed, 17 Jul 2013 18:26:47 +0100
From:	Zubair Lutfullah <zubair.lutfullah@...il.com>
To:	jic23@....ac.uk
Cc:	linux-iio@...r.kernel.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, koen@...inion.thruhere.net,
	zubair.lutfullah@...il.com
Subject: [PATCH 18/21] IIO: ti_adc: Fix capture operation during resume

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

Signed-off-by: Russ Dill <Russ.Dill@...com>
Signed-off-by: Zubair Lutfullah <zubair.lutfullah@...il.com>
---
 drivers/iio/adc/ti_am335x_adc.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 1f42e0a..40eec84 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -588,12 +588,16 @@ 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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