| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.0 034/148] iio: adc: cc10001: Add delay before setting START bit | Date | Wed, 3 Jun 2015 21:08:24 +0900 |
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4.0-stable review patch. If anyone has any objections, please let me know.
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From: Naidu Tellapati <naidu.tellapati@imgtec.com>
commit f29b212edb9e253cafcb4a2ab7842a890989f1a5 upstream.
According to hardware team there should be some delay after setting channel number, start mode and before setting START. Add a one microsecond delay for this purpose.
Fixes: 1664f6a5b0c8 ("iio: adc: Cosmic Circuits 10001 ADC driver") Signed-off-by: Naidu Tellapati <naidu.tellapati@imgtec.com> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/iio/adc/cc10001_adc.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/iio/adc/cc10001_adc.c +++ b/drivers/iio/adc/cc10001_adc.c @@ -100,6 +100,7 @@ static void cc10001_adc_start(struct cc1 val = (channel & CC10001_ADC_CH_MASK) | CC10001_ADC_MODE_SINGLE_CONV; cc10001_adc_write_reg(adc_dev, CC10001_ADC_CONFIG, val); + udelay(1); val = cc10001_adc_read_reg(adc_dev, CC10001_ADC_CONFIG); val = val | CC10001_ADC_START_CONV; cc10001_adc_write_reg(adc_dev, CC10001_ADC_CONFIG, val);
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