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iio: adc: try to get flag again after the first failure [2/2]

Browse Source 
PD#SH-451

Problem:
to get flag maybe occasionally fail

Solution:
try to get flag again after the first failure

Verify:
test pass on s400

Change-Id: Ibf430c9c331c7740864e797047962ad45e6698e3
Signed-off-by: Xingyu Chen <xingyu.chen@amlogic.com>
This commit is contained in:
Xingyu Chen
2019-03-29 16:09:58 +08:00
committed by Tao Zeng
parent b2cdbd0668
commit 2f278c55ca
1 changed files with 8 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/amlogic/iio/adc/meson_saradc.c
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@@ -619,6 +619,7 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev)
mutex_lock(&indio_dev->mlock);
if (priv->data->has_bl30_integration) {
again:
/* wait until BL30 releases it's lock (so we can use
* the SAR ADC)
*/
@@ -636,10 +637,10 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev)
MESON_SAR_ADC_DELAY_KERNEL_BUSY);
isb();
dsb(sy);
udelay(1);
udelay(5);
regmap_read(priv->regmap, MESON_SAR_ADC_DELAY, &val);
if (val & MESON_SAR_ADC_DELAY_BL30_BUSY)
return -ETIMEDOUT;
goto again;
}
return 0;
@@ -649,10 +650,14 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev)
{
struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
if (priv->data->has_bl30_integration)
if (priv->data->has_bl30_integration) {
/* allow BL30 to use the SAR ADC again */
regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY,
MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0);
isb();
dsb(sy);
udelay(5);
}
mutex_unlock(&indio_dev->mlock);
}