Re: Continuous Interrupt Problem

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Is the issue resolved?

This seems to be more of either a device that's buggy or some misunderstanding in understanding the device specs.

I had a similar issue with one of our devices. When I get an interrupt I would do some thing in the device (reading buffers writing some registers and stuff) that should reset the Interrupt pin to high state again. But the hardware had a bug that would not let the Interrupt pin reset, and once I return from the Interrupt it would strike again causing the system to freeze. 

Thanks
Shaji Yusuf



From: siddharth saxena <siddharthsaxena1989@xxxxxxxxx>
To: anish singh <anish198519851985@xxxxxxxxx>
Cc: Arun KS <getarunks@xxxxxxxxx>; Sarbojit Ganguly <unixman.linuxboy@xxxxxxxxx>; kernelnewbies@xxxxxxxxxxxxxxxxx
Sent: Thursday, June 14, 2012 2:35 PM
Subject: Re: Continuous Interrupt Problem

Initialized in Probe :

if (device->irq) {
        ret = request_irq(device->irq, ts_int_handler,
        IRQF_TRIGGER_LOW, DRIVER_NAME, device);
        if (ret) {
            pr_err("unable to register touch irq.(%s)\r\n",
            device->input_dev->name);
            goto err_request_irq;
        }
    }



The pin by default has to be initialized to Active Low.




On Thu, Jun 14, 2012 at 2:24 PM, anish singh <anish198519851985@xxxxxxxxx> wrote:
On Thu, Jun 14, 2012 at 2:11 PM, siddharth saxena
<siddharthsaxena1989@xxxxxxxxx> wrote:
> Hi Arun
>
> I tried changing the flag to IRQF_TRIGGER_HIGH but then device is behaving
> abnormally(Hangs and is dead after some time).
> Flooding interrupts still observed. Problem not solved.
>
> I want to know, are we supposed to change interrupt pin status or it is done
> automatically when we return IRQ_HANDLED.
why don't you paste the code for your probe routine where you are
calling request_irq.
Are you using threaded irq?It would be difficult to diagnose the
problem without looking
at your TSP manual and your code to find out the problem.
>
>
>
>
> On Thu, Jun 14, 2012 at 12:21 PM, Sarbojit Ganguly
> <unixman.linuxboy@xxxxxxxxx> wrote:
>>
>> Hi Arun,
>>
>> While I agree to your pointers but he is facing the problem of
>> "interrupt floods" even before he touches.
>> IMHO the culprit could be the flag.
>>
>> On 14 June 2012 12:01, Arun KS <getarunks@xxxxxxxxx> wrote:
>> > Hello Siddharth,
>> >
>> > On Thu, Jun 14, 2012 at 10:34 AM, siddharth saxena
>> > <siddharthsaxena1989@xxxxxxxxx> wrote:
>> >> Hi all
>> >>
>> >> I need help with an issue.
>> >> I have written a touch driver for a device and used the flag
>> >> IRQF_TRIGGER_LOW to request irq.
>> >> Now, when I boot the device, the touch interrupts are coming already
>> >> without
>> >> touching the screen.
>> >> Continuous interrupts are occurring without any touch.
>> >
>> > Probably the default state of the gpio pin(which you configured as
>> > irq) is low. Check your HW schematic.
>> >
>> > TSC should have interrupt polarity(Active High/Low), which you have to
>> > choose depending on your schematic while initiallizing the TSC.
>> > Also different modes like assert interrupt when finger moving, when
>> > finger touch, or assert periodically.
>> >
>> > Hope these pointer will help you.
>> >
>> > Thanks,
>> > Arun
>> >
>> >>
>> >>
>> >>
>> >> --
>> >> Regards
>> >> Siddharth Saxena
>> >>
>> >>
>> >> _______________________________________________
>> >> Kernelnewbies mailing list
>> >> Kernelnewbies@xxxxxxxxxxxxxxxxx
>> >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>> >>
>> >
>> > _______________________________________________
>> > Kernelnewbies mailing list
>> > Kernelnewbies@xxxxxxxxxxxxxxxxx
>> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>>
>>
>> --
>> Regards,
>> Sarbojit
>
>
>
>
> --
> Regards
> Siddharth Saxena
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies@xxxxxxxxxxxxxxxxx
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>



--
Regards
Siddharth Saxena


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