[Letux-kernel] Status 5.0-rc2 on Pyra

Tony Lindgren tony at atomide.com
Thu Jan 17 15:27:57 CET 2019


* H. Nikolaus Schaller <hns at goldelico.com> [190117 11:07]:
> Hi Tony,
> 
> > Am 16.01.2019 um 22:19 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> > 
> > Hi,
> > I did some initial booting of the latest Letux kernel.
> > We again have no display but this time the backlight
> > PWM is missing. Only the keyboard backlight PWM
> > works. There are no reports from omapdrm about panel
> > failures and X11 is starting.
> > 
> > Secondly, Tony has suggested a fix for some interrupt
> > issue.
> > 
> > Applying his patch plus two more where I think he was
> > referring to [1] makes the interrupt reports during initial
> > boot go away. So I'll take this for 5.0-rc3.
> > 
> > There will be a new single report from pcal6524 that nobody
> > cares about some interrupt. This is likely be the ts3a227
> > headset detection interrupt which was never working
> > properly before.
> > 
> > And maybe have a look into the backlight issue.
> 
> First result on changes for this:
> 
> There has been a significant rework of the omap5.dtsi.
> 
> THis has changed the DTB definitions of timers1..4 and 9..12
> to use ti,sysc-omap4-timer while timer5..8 are still
> ti,omap5430-timer.

Yes the ABE changes still need a bit more work for mcpdm
clock.

> This seems to break dmtimer/pwm mode for timer9 which
> we use for driving display backlight while timer8
> for keyboard backlight still works.

Oops sorry about that.

> Is there an upcoming patch not yet merged in 5.0-rc2 or
> what makes the difference in 5.0 between timer8 and timer9?

I need to look. Sounds like there might be some optional clock
missing in the dts. I'll take a look.

> PS: the symptom is that we don't even see a /sys/class/backlight
> node for the display backlight [2].

OK

Regards,

Tony


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