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iio: adc: ti_am335x_adc: fix fifo overrun recovery 

The tiadc_irq_h(int irq, void *private) function is handling FIFO
overruns by clearing flags, disabling and enabling the ADC to
recover.

If the ADC is running in continuous mode a FIFO overrun happens
regularly. If the disabling of the ADC happens concurrently with
a new conversion. It might happen that the enabling of the ADC
is ignored by the hardware. This stops the ADC permanently. No
more interrupts are triggered.

According to the AM335x Reference Manual (SPRUH73H October 2011 -
Revised April 2013 - Chapter 12.4 and 12.5) it is necessary to
check the ADC FSM bits in REG_ADCFSM before enabling the ADC
again. Because the disabling of the ADC is done right after the
current conversion has been finished.

To trigger this bug it is necessary to run the ADC in continuous
mode. The ADC values of all channels need to be read in an endless
loop. The bug appears within the first 6 hours (~5.4 million
handled FIFO overruns). The user space application will hang on
reading new values from the character device.

Fixes: ca9a563805 ("iio: ti_am335x_adc: Add continuous sampling
support")
Signed-off-by: Michael Engl <michael.engl@wjw-solutions.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Michael Engl 2017-10-03 13:57:00 +01:00 committed by Jonathan Cameron
parent c42f821861
commit e83bb3e6f3
1 changed files with 12 additions and 1 deletions
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13
drivers/iio/adc/ti_am335x_adc.c
View File

@ -169,7 +169,9 @@ static irqreturn_t tiadc_irq_h(int irq, void *private)
{ {
struct iio_dev *indio_dev = private; struct iio_dev *indio_dev = private;
struct tiadc_device *adc_dev = iio_priv(indio_dev); struct tiadc_device *adc_dev = iio_priv(indio_dev);
unsigned int status, config; unsigned int status, config, adc_fsm;
unsigned short count = 0;
status = tiadc_readl(adc_dev, REG_IRQSTATUS); status = tiadc_readl(adc_dev, REG_IRQSTATUS);
/* /*
@ -183,6 +185,15 @@ static irqreturn_t tiadc_irq_h(int irq, void *private)
tiadc_writel(adc_dev, REG_CTRL, config); tiadc_writel(adc_dev, REG_CTRL, config);
tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1OVRRUN tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1OVRRUN
| IRQENB_FIFO1UNDRFLW | IRQENB_FIFO1THRES); | IRQENB_FIFO1UNDRFLW | IRQENB_FIFO1THRES);
/* wait for idle state.
* ADC needs to finish the current conversion
* before disabling the module
*/
do {
adc_fsm = tiadc_readl(adc_dev, REG_ADCFSM);
} while (adc_fsm != 0x10 && count++ < 100);
tiadc_writel(adc_dev, REG_CTRL, (config | CNTRLREG_TSCSSENB)); tiadc_writel(adc_dev, REG_CTRL, (config | CNTRLREG_TSCSSENB));
return IRQ_HANDLED; return IRQ_HANDLED;
} else if (status & IRQENB_FIFO1THRES) { } else if (status & IRQENB_FIFO1THRES) {