Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx> writes:
> 2014-11-27 1:12 GMT+03:00 Robert Jarzmik <robert.jarzmik@xxxxxxx>:
>> OK Dmitry, I pulled through, the interrupts are working back.
>
> What was the problem? Hardware issues? Firmware in CPLD being of old
> revision?
There were basically 2 problems :
- hardware: switch S13 was in a position that disabled interrupts all the time
One other problem which fooled me was the incorrect gate schematics I had,
and which make my understanding of linear function foo such as
GPIO0 = foo(LUB_IRQ_EN, LUB_SET_CLR) false.
- software: lubbock.c error
Since gpio-pxa was ported to device/gpio, it is probed *after*
lubbock_init_irq() is called. As lubbock_init_irq() installs
lubbock_irq_handler() and sets the irq to falling edge detect before gpio-pxa
is probed, gpio-pxa probe overwrites this by :
- clearing any edge detection (probe state reset)
- installing generic handle_edge_irq() instead of the lubbock irq handler
So the conclusion is that I have to rework lubbock_init_irq(), remove from it
the PXA_GPIO_TO_IRQ(0) stuff, and move it to a code in lubbock.c which will
provide the guarantee of being executed _after_ gpio-pxa is probed. When I'm
happy with my patch I'll submit it.
Cheers.
--
Robert
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