[PATCH v3 04/10] pmdomain: mediatek: Refactor bus protection regmaps retrieval

[Macpaul Lin (林智斌)]

On Wed, 2025-10-29 at 11:56 +0100, AngeloGioacchino Del Regno wrote:
> 

[snip]

> Thanks for the logs! Getting issues on MSDC is really odd because the
> MSDC
> controller does *not* use nor have any power domain...
> 
> I'll take a look at this as soon as I can, anyway.
> 
> Thanks again,
> Angelo
> 
> > [    1.291055] mtk-msdc 11240000.mmc: msdc_track_cmd_data: cmd=8
> > arg=000001AA; host->error=0x00000002
> > [    1.292775] mtk-msdc 11240000.mmc: msdc_track_cmd_data: cmd=55
> > arg=00000000; host->error=0x00000002
> > [    1.294539] mtk-msdc 11240000.mmc: msdc_track_cmd_data: cmd=55
> > arg=00000000; host->error=0x00000002
> > [    1.296293] mtk-msdc 11240000.mmc: msdc_track_cmd_data: cmd=55
> > arg=00000000; host->error=0x00000002
> > ...
> > [    1.430408] mtk-msdc 11240000.mmc: msdc_track_cmd_data: cmd=55
> > arg=00000000; host->error=0x00000002
> > [    1.433766] mmc0: Failed to initialize a non-removable card
> > [   22.297240] rcu: INFO: rcu_preempt detected stalls on
> > CPUs/tasks:
> > [   22.298723] rcu:     6-...0: (2 ticks this GP)
> > idle=104c/1/0x4000000000000000 softirq=45/45 fqs=37
> > [   22.299827] rcu:     (detected by 2, t=5256 jiffies, g=-1051,
> > q=200
> > ncpus=8)
> > [   22.300689] Sending NMI from CPU 2 to CPUs 6:
> > 
> > Best regards,
> > Macpaul Lin
> 
> 

The command retry only happens in the very beginning during linux boot.

The following rcu_preempt and cpu/task stall are keep appearing until
poewr off. It is more like cpu not responding or runtime-PM? I've not
try to disable any power related kernel option yet.

[22649.698912] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[22649.699687] rcu:     5-...0: (0 ticks this GP)
idle=1b7c/1/0x4000000000000000 softirq=32/32 fqs=976599
[22649.700835] rcu:     (detected by 1, t=5662102 jiffies, g=-1055,
q=216 ncpus=8)
[22649.701728] Sending NMI from CPU 1 to CPUs 5:
[22659.701734] rcu: rcu_preempt kthread starved for 2495 jiffies! g-
1055 f0x0 RCU_GP_DOING_FQS(6) ->state=0x0 ->cpu=0
[22659.703592] rcu:     Unless rcu_preempt kthread gets sufficient CPU
time, OOM is now expected behavior.
[22659.704746] rcu: RCU grace-period kthread stack dump:
[22659.705386] task:rcu_preempt     state:I stack:0     pid:15   
tgid:15    ppid:2      task_flags:0x208040 flags:0x00000010
[22659.706784] Call trace:
[22659.707097]  __switch_to+0xf0/0x1b0 (T)
[22659.707590]  __schedule+0x3b0/0xca8
[22659.708039]  schedule+0x3c/0x120
[22659.708453]  schedule_timeout+0x8c/0x130
[22659.708956]  rcu_gp_fqs_loop+0x140/0x6c0
[22659.709459]  rcu_gp_kthread+0x208/0x258
[22659.709951]  kthread+0x14c/0x230
[22659.710365]  ret_from_fork+0x10/0x20
[22659.710824] rcu: Stack dump where RCU GP kthread last ran:
[22659.711517] Sending NMI from CPU 1 to CPUs 0:
[22659.712109] NMI backtrace for cpu 0
[22659.712117] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.18.0-
rc3-next-20251028-mtk+modified-04392-g5c921b2c5975 #1 PREEMPT
[22659.712123] Hardware name: MediaTek Genio 1200 EVK-P1V2-EMMC (DT)
[22659.712126] pstate: 40400009 (nZcv daif +PAN -UAO -TCO -DIT -SSBS
BTYPE=--)
[22659.712130] pc : cpuidle_enter_state+0x2bc/0x720
[22659.712137] lr : cpuidle_enter_state+0x2b8/0x720
[22659.712141] sp : ffff800084473d00
[22659.712143] x29: ffff800084473d00 x28: 0000000000000000 x27:
ffff0001fef7d8c0
[22659.712151] x26: 0000000000000001 x25: 0000149be00653eb x24:
0000149be01736ef
[22659.712157] x23: 0000000000000002 x22: ffff0000c2d38880 x21:
0000000000000002
[22659.712163] x20: ffff0000c2d38968 x19: ffff0001fee7e9f8 x18:
000000005bd3baae
[22659.712169] x17: 000000040044ffff x16: 005000f2b5503510 x15:
0000000000000000
[22659.712175] x14: ffff800084487540 x13: ffff80017b8c8000 x12:
ffff8000816f9830
[22659.712181] x11: 0000000000000000 x10: 0000000000000000 x9 :
ffff8000801dc64c
[22659.712187] x8 : 000000f2b5503510 x7 : 0000000000f0000f x6 :
00000000ff0ffff0
[22659.712193] x5 : ffff80017b8c8000 x4 : 0000000000000000 x3 :
ffff800084473c10
[22659.712199] x2 : 000000449d287e7f x1 : ffff800084487540 x0 :
0000000000000000
[22659.712205] Call trace:
[22659.712207]  cpuidle_enter_state+0x2bc/0x720 (P)
[22659.712212]  cpuidle_enter+0x40/0x60
[22659.712219]  do_idle+0x208/0x298
[22659.712226]  cpu_startup_entry+0x3c/0x50
[22659.712232]  rest_init+0xfc/0x120
[22659.712236]  start_kernel+0x7a4/0x920
[22659.712243]  __primary_switched+0x88/0x98

Regards,
Macpaul Lin