am3354 1G MHz request_irq 7 in Linux cause crash

wich lin

Prodigy 70 points

Other Parts Discussed in Thread: AM3354

Dears

We used am3354 720MHz to use request_irq(7) in Linux, and it woked well.

We change to 1G due to 720MHz phase out, but it doesn't work anymore.

We use the pin B18, NNMI or NMIn of am3354 to detect input power,

and request_irq(7, (irq_handler_t)PowerFailure, IRQF_TRIGGER_NONE, "power failure", NULL);

7 means the NNMI we find it in specification.

We use linux kernel 3.2 from ti-sdk-am335x-evm-05.04.01.00

[ 0.892242] receive power failure from nNMI
[ 0.896697] irq event 7: bogus return value 36
[ 0.901336] Backtrace:
[ 0.903930] [<c00179e8>] (dump_backtrace+0x0/0x110) from [<c0419ad0>] (dump_stack+0x18/0x1c)
[ 0.912719] r6:00000007 r5:c05e5cf4 r4:00000036 r3:c05e38d0
[ 0.918670] [<c0419ab8>] (dump_stack+0x0/0x1c) from [<c00712f4>] (__report_bad_irq.clone.5+0x30/0xbc)
[ 0.928314] [<c00712c4>] (__report_bad_irq.clone.5+0x0/0xbc) from [<c007151c>] (note_interrupt+0x134/0x240)
[ 0.938476] r5:c05e5cc4 r4:00000036

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Can you please post the silicon revisions (or top-side markings) of the two processors? There is an Errata Advisory 1.0.6 regarding the EXTINTn pin active level.

0 wich lin over 10 years ago in reply to Biser Gatchev-XID

Prodigy 70 points

AM3354ZCZD72 28C214W GI 962 ZCZ => 720MHz
AM3354BZCZ100 3CAIR5W GI 962B ZCZ => 1000MHz

0 Biser Gatchev-XID over 10 years ago in reply to wich lin

TI__Guru**** 393215 points

AM3354ZCZD72 is silicon revision 1.0. EXTINTn polarity is active high on this revision.

AM3354BZCZ100 is silicon revision 2.1. EXTINTn polarity is active low on this revision.

0 wich lin over 10 years ago in reply to Biser Gatchev-XID

Prodigy 70 points

I don't understand.
This is a pin for input. I can use IRQF_TRIGGER_RISING or IRQF_TRIGGER_FALLING for irq_request().
But I just execute request_irq() function then it crush. Even I use IRQF_TRIGGER_NONE
Why ?

0 Biser Gatchev-XID over 10 years ago in reply to wich lin

TI__Guru**** 393215 points

Try inverting the external signal applied to this pin and check if the issue still exists.

0 wich lin over 10 years ago in reply to Biser Gatchev-XID

Prodigy 70 points

Hi Biser

It works after invert the external signal.

I still need a way to get the sillicon version.

Is there any sample code I can add it into linux kernel driver to decide triggerred by falling or rising?

0 Biser Gatchev-XID over 10 years ago in reply to wich lin

TI__Guru**** 393215 points

The silicon revision can be read from the DEVREV field in the Device_ID register (Address 0x44E10600). See AM335X TRM Rev. K section 1.1.2 for details.

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am3354 1G MHz request_irq 7 in Linux cause crash