[BUG] AM335x (BeagleBone Black Wireless) suspend/resume regression starting in Linux 6.10

[petter at technux.se]

Hi,

I have some issues when trying to bump a BeagleBone Black Wireless board 
from Linux 6.6 to 6.12 (or later). When using rtcwake to test 
suspend/resume the system freezes on

[  209.104183] PM: suspend entry (deep)
[  209.111191] Filesystems sync: 0.003 seconds
[  209.147496] Freezing user space processes
[  209.155818] Freezing user space processes completed (elapsed 0.003 
seconds)
[  209.163098] OOM killer disabled.
[  209.166495] Freezing remaining freezable tasks
[  209.172805] Freezing remaining freezable tasks completed (elapsed 
0.001 seconds)
[  209.180559] printk: Suspending console(s) (use no_console_suspend to 
debug)

I have also tried with no_console_suspend then I can see below 
additional printouts before the system stalls

[ 215.505253] omap8250 48022000.serial: ttyS1: Unable to drain 
transmitter [ 215.531553] l4ls-clkctrl:0034:0: failed to disable

I tried to bisect the issue and reverting below commits seems to solve 
it on 6.10 -> 6.12 kernels.

4bcc2e91b9e7 bus: ti-sysc: Drop legacy idle quirk handling
2414277f5145 bus: ti-sysc: Drop legacy quirk handling for smartreflex
5f711f036588 bus: ti-sysc: Drop legacy quirk handling for uarts

BUT on Linux 6.17 I tried to revert above commits and it still seems to 
hang. Anyone that knows how I can debug this further or have any 
suggestion for what is really wrong here?

BR Petter