On 12/20/2013 12:07 PM, Rajendra Nayak wrote:
On Friday 20 December 2013 12:32 AM, Tero Kristo wrote:
On 12/19/2013 08:26 PM, Tony Lindgren wrote:
* Tero Kristo <t-kristo@xxxxxx> [131219 03:26]:
Divider clock can now be registered to use low level register access ops.
Preferred initialization method is via clock description.
This seems to make omap2 not boot for me. No output whatsoever even with
DEBUG_LL and earlyprintk.
Thats weird... I was kind of afraid something like this might happen though as these patches touch the clock low level routines globally, but I can't see what could be broken...
I got hold of a 2430sdp and saw the same behavior, however DEBUG_LL and earlyprintk worked and this is
what I see
[ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 0.000000] pgd = c0004000
[ 0.000000] [00000000] *pgd=00000000
[ 0.000000] Internal error: Oops: 5 [#1] SMP ARM
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.13.0-rc4-00056-ga9fa93e #2
[ 0.000000] task: c07dfcb8 ti: c07d4000 task.ti: c07d4000
[ 0.000000] PC is at clk_mux_get_parent+0x14/0xcc
[ 0.000000] LR is at clk_mux_get_parent+0x10/0xcc
[ 0.000000] pc : [<c044a234>] lr : [<c044a230>] psr: a00001d3
[ 0.000000] sp : c07d5f40 ip : 00000000 fp : 00000000
[ 0.000000] r10: c07dc880 r9 : 4107b366 r8 : c07f46a4
[ 0.000000] r7 : c0edfa80 r6 : ffffffff r5 : c07f6810 r4 : 00000002
[ 0.000000] r3 : 00000000 r2 : 00000000 r1 : c069da67 r0 : 00000002
[ 0.000000] Flags: NzCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment kernel
[ 0.000000] Control: 00c5387d Table: 80004000 DAC: 00000017
[ 0.000000] Process swapper/0 (pid: 0, stack limit = 0xc07d4248)
[ 0.000000] Stack: (0xc07d5f40 to 0xc07d6000)
[ 0.000000] 5f40: c044a220 00000002 c6001f40 c0448e54 c07dfcb8 c0862f7c c07f3600 c07f4368
[ 0.000000] 5f60: ffffffff c0edfa80 c07b6b80 4107b366 c07dc880 c077edf4 c0531008 c07f4380
[ 0.000000] 5f80: c07f34d4 c077f20c c0878964 c0edfa80 c07b6b80 c0877ac4 c0877640 ffffffff
[ 0.000000] 5fa0: c0edfa80 c0777268 00000001 c07792ac c07b5250 c077221c 00000002 c076e974
[ 0.000000] 5fc0: ffffffff ffffffff c076e57c 00000000 00000000 c07b6b80 00000000 00c5387d
[ 0.000000] 5fe0: c07dc928 c07b6b7c c07e1474 80004008 8052c544 80008074 00000000 00000000
[ 0.000000] [<c044a234>] (clk_mux_get_parent+0x14/0xcc) from [<c0448e54>] (__clk_init+0xe4/0x3f0)
[ 0.000000] [<c0448e54>] (__clk_init+0xe4/0x3f0) from [<c077edf4>] (omap_clocks_register+0x24/0x48)
[ 0.000000] [<c077edf4>] (omap_clocks_register+0x24/0x48) from [<c077f20c>] (omap2430_clk_init+0x4c/0x124)
[ 0.000000] [<c077f20c>] (omap2430_clk_init+0x4c/0x124) from [<c0777268>] (omap_clk_init+0x28/0x30)
[ 0.000000] [<c0777268>] (omap_clk_init+0x28/0x30) from [<c07792ac>] (omap2_sync32k_timer_init+0x8/0x58)
[ 0.000000] [<c07792ac>] (omap2_sync32k_timer_init+0x8/0x58) from [<c077221c>] (time_init+0x1c/0x30)
[ 0.000000] [<c077221c>] (time_init+0x1c/0x30) from [<c076e974>] (start_kernel+0x1d4/0x360)
[ 0.000000] [<c076e974>] (start_kernel+0x1d4/0x360) from [<80008074>] (0x80008074)
[ 0.000000] Code: e1a05000 e5900000 ebfff7f5 e595300c (e5933000)
[ 0.000000] ---[ end trace 3406ff24bd97382e ]---
[ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
I'll try and debug further but any quick thoughts on what could be wrong?
I have a fix for this already and will be posting v12 today. I will just
re-post the drivers/clk part of the series though, rest of the patches
should be fine.
This bug was silly actually, I didn't think of the static clock data
initialization through the macros from clk-private.h... This caused the
resulting clock structures to have NULL for clk_ll_ops as it bypassed
the init function where I set it up. So, I will need to check against
NULL every time I do anything with ll_ops.
-Tero
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