[Dynamicpower-devel] Data abort after wakeup from mem standby

[Manish R. <man...@st...>]

 
Hi,
I am implementing power management  on arm926ejs based soc.
When I take system to deep sleep (mem standby ) and wakeup, 
Then in some cases ( approx 1 out of 10), I get dump written at end of mail.
In rest of cases it run successfully.
Pls note than I wakeup succesfully and I get some prints from end of
kernel/power/main.c.

In mem standby entry and exit, save & restore mmu registers, peripheral
registers etc.
Can anybody give me any clue? I am not able to put any breakpoint on data
abort handler after deep sleep.

Thanks
Regards
Manish

Dump is as follows:
-------------------

Bad mode in data abort handler detected: mode UND_32

Internal error: Oops - bad mode: 0 [#3]

Modules linked in:

CPU: 0

PC is at 0xffff0380

LR is at update_mmu_cache+0x1b0/0x1c4

pc : [<ffff0380>]    lr : [<c002a030>]    Not tainted

sp : c1b49e30  ip : 00000000  fp : c1b49ebc

r10: c001e4e0  r9 : c937f4f8  r8 : 0000d000

r7 : 00000000  r6 : 00000005  r5 : c9822548  r4 : 00000000

r3 : 00001000  r2 : 00001875  r1 : 0000e000  r0 : 0000d6c0

Flags: nzcv  IRQs off  FIQs on  Mode UND_32  Segment user

Control: 5317F  Table: 00530000  DAC: 00000015

Process busybox (pid: 227, stack limit = 0xc1b481a0)

Stack: (0xc1b49e30 to 0xc1b4a000)

9e20:                                     0000d6c0 0000e000 00001875
00001000 

9e40: 00000000 c9822548 00000005 00000000 0000d000 c937f4f8 c001e4e0
c1b49ebc 

9e60: 00000000 c1b49e30 c002a030 ffff0380 0000009b ffffffff 0000008c
c001b570 

9e80: 00000080 00000000 00000000 c937f50c 00000005 00000005 09b8f05f
c03e11e0 

9ea0: c1b48000 c9822548 0000d000 c001e4e0 c1b49f2c c1b49ec0 c00759fc
c0029e90 

9ec0: c1b49ef4 c98222a0 c98222ac 0000081f c1b49efc 00000000 c02300a8
c0530000 

9ee0: c0530000 c9c9a834 00000034 00000000 00000000 c1b49f00 c002a5dc
00000002 

9f00: c1b49f2c ffffffff c001e514 c9822548 c93ac820 0000d334 c1b49fb0
c001e4e0 

9f20: c1b49f6c c1b49f30 c002a2dc c0075580 c1b855a0 0000009e 00000000
00000000 

9f40: c02977b8 ffffffff 0000d334 0000d334 00000000 c1b49fb0 00000000
40023000 

9f60: c1b49f9c c1b49f70 c002a504 c002a208 c004d49c c98222e0 c1b49fac
ffffffff 

9f80: 00000000 0000d334 00000000 00000000 c1b49fac c1b49fa0 c002a59c
c002a4e4 

9fa0: 00000000 c1b49fb0 c0021d68 c002a594 4000d810 40017628 bed9de94
0000001c 

9fc0: 00000000 00000000 0000d334 00000000 00000000 00000000 40023000
00000000 

9fe0: 00000000 bed9de90 4000d4c8 0000d334 60000010 ffffffff 00000000
00000000 

Backtrace: 

[<c0029e80>] (update_mmu_cache+0x0/0x1c4) from [<c00759fc>]
(__handle_mm_fault+0x48c/0x92c)

[<c0075570>] (__handle_mm_fault+0x0/0x92c) from [<c002a2dc>]
(do_page_fault+0xe4/0x230)

[<c002a1f8>] (do_page_fault+0x0/0x230) from [<c002a504>]
(do_translation_fault+0x30/0xb0)

[<c002a4d4>] (do_translation_fault+0x0/0xb0) from [<c002a59c>]
(do_PrefetchAbort+0x18/0x1c)

 r8 = 00000000  r7 = 00000000  r6 = 0000D334  r5 = 00000000

 r4 = FFFFFFFF 

[<c002a584>] (do_PrefetchAbort+0x0/0x1c) from [<c0021d68>]
(ret_from_exception+0x0/0x10)

Code: 00000000 00000000 00000000 00000000 (e88d4001) 

 <6>note: busybox[227] exited with preempt_count 1