Messages in this thread | | | Date | Sat, 28 Jun 2008 15:52:02 +0400 | From | Sergei Shtylyov <> | Subject | Re: [PATCH v2 -rt] ide: workaround buggy hardware issues with preemptable hardirqs |
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Hello.
Anton Vorontsov wrote: >>> But some hardware (namely ULi M5228 in the ULi M1575 "Super South Brige") >>> behaves in a strange way: it asserts interrupts as edge sensitive. And >>> because preemptable IRQ handler disables PIC's interrupt, PIC will likely >>> miss it. >>> >>> >> Unmasking an IRQ should re-enable an edge detector in a PIC (or that >> detector should even be independent from mask). >> > Should? Hm.. well, I can easily check it. Will just program the MPIC IRQ > to edge sensitive, and see if it fixes the problem (not sure if I already > tried this, I think I did try). >
That will not help if edge detector is not active for masked out IRQs (that's how i8259 behaves, IIRC) *and* you're getting the short IRQ "pulses" but should help if IRQ is generated normally -- though in this case the level trigger mode (with the same polarity) should work as well...
MBR, Sergei
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