The following is the patch that we are using internally to workaround the
issues - I first wanted to publish the timeout/systemhang patch, because I
don't have the feeling that our workaround is suitable to be mainlined:
static int at91_adc_read_raw(struct iio_dev *idev,
I don't know how the race condition is triggered in detail. All I know is that
if Touch Acquisition is enabled the adc_demo_error2 will provoke a systemhang.
If Touch is disabled the issue goes away. The architecture of at91_adc.c uses
(at least) two trigger mechanisms of the ADC peripheral: To
Actually this issue occurred to us with an concrete product, where we
experienced a system hang at -20 °C.
It was triggered by a race condition between the Touch Trigger and the Channel
Trigger of the ADC. Once triggered we got in to the situation where an ongoing
Channel Conversion was lost (Ti
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