[Letux-kernel] [PATCH 00/20] A bunch of JZ4730 fixups for letux-kernel

[Lubomir Rintel]

On Thu, Nov 26, 2020 at 11:22:56PM +0100, Paul Boddie wrote:
> On Thursday, 26 November 2020 20:06:12 CET H. Nikolaus Schaller wrote:
> > Hi Paul and Lubomir,
> > 
> > > Paul<0001-Added-missing-TCU-declarations-for-the-JZ4730.patch>
> > 
> > a little late but you still deserve many thanks!
> > 
> > I have added it but see no difference. I just see Starting Kernel... and
> > then some watchdog reboots.
> 
> One thing that may be different, at least when you can monitor the log, is the 
> following line:
> 
>   [    0.000000] timer_probe: no matching timers found
> 
> Then again, searching for any reports about this leaves me unconvinced that it 
> might be a problem. In Lubomir's log output, the next line is this...
> 
>   [    0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps 
> every 21474836475000000ns
> 
> Maybe this indicates that the lack of timer assignments won't be a problem 
> because scheduling is done using other timers.

Thank you. With a little more patching I got a more respectable panic
now. I'll follow up with the patches.

The configuration [1] and dmesg [2] are here:

[1] https://people.freedesktop.org/~lkundrak/jz4730/config-20201127.txt
[2] https://people.freedesktop.org/~lkundrak/jz4730/dmesg-20201127.txt

1.) I'm using clk_ignore_unused because disabling of the dma clock seems
    to make the cpu grind to a halt (not even jtag works at that point).
    Also, if dma clock is kept enabled, disabling of some other clock
    (no idea which one yet) makes things go very slow.

2.) I'm using clocksource=jiffies because switch to ingenic-timer makes
    the scheduler clock poll callback not fire and thus the clock ends
    up loop aroud in 65535 ticks.

3.) The scheduler clock poll doesn't probably run often enough because
    the clock seems overflow and go backwards sometimes.

4.) Some errors in LCD and DMA DT notes are now apparent and the MMC
    doesn't work. I guess there might be more driver issues.

I'll be looking into above as time permits, but would be thankful for
hints.

Take care
Lubo

> 
> Paul
> 
>