[Letux-kernel] Status 5.0-rc2 on Pyra

[H. Nikolaus Schaller]

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.

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

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

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

> And
> maybe we can make the ts3a227 work better now.
> 
> BR,
> Nikolaus
> 
> [1]:
> 29ec027f335f (HEAD -> work-regmap-irq) regmap-irq: do not write mask register if mask_base is zero
> dc657b4e5398 regmap: regmap-irq: silently ignore unsupported type settings
> c7551981ac24 ARM: OMAP5+: Fix inverted nirq pin interrupts with irq_set_type
> 7ed965e3d926 (origin/letux-5.0-rc2, github/letux-5.0-rc2) Merge branch 'letux/omap5-idle' into letux-5.0-rc2

BR and thanks,
Nikolaus

[2]:

root at letux:~# dmesg|fgrep backlight
[    5.517680] pwm-backlight keyboard-backlight: keyboard-backlight supply power not found, using dummy regulator
[    5.538792] pwm-backlight keyboard-backlight: Linked as a consumer to regulator.0
[    5.674258] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    5.700572] pwm-backlight backlight: Linked as a consumer to regulator.0
[    5.717573] pwm-backlight backlight: Dropping the link to regulator.0
[    5.772733] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    5.781804] pwm-backlight backlight: Linked as a consumer to regulator.0
[    5.790023] pwm-backlight backlight: Dropping the link to regulator.0
[    5.843633] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    5.873626] pwm-backlight backlight: Linked as a consumer to regulator.0
[    5.890691] pwm-backlight backlight: Dropping the link to regulator.0
[    5.929008] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    5.945003] pwm-backlight backlight: Linked as a consumer to regulator.0
[    5.954180] pwm-backlight backlight: Dropping the link to regulator.0
[    6.011288] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    6.029750] pwm-backlight backlight: Linked as a consumer to regulator.0
[    6.038994] pwm-backlight backlight: Dropping the link to regulator.0
[    6.095427] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    6.106264] pwm-backlight backlight: Linked as a consumer to regulator.0
[    6.115262] pwm-backlight backlight: Dropping the link to regulator.0
[    6.302004] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    6.311499] pwm-backlight backlight: Linked as a consumer to regulator.0
[    6.323951] pwm-backlight backlight: Dropping the link to regulator.0
[    6.592987] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    6.618723] pwm-backlight backlight: Linked as a consumer to regulator.0
[    6.625933] pwm-backlight backlight: Dropping the link to regulator.0
[    6.781206] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    6.790891] pwm-backlight backlight: Linked as a consumer to regulator.0
[    6.801874] pwm-backlight backlight: Dropping the link to regulator.0
[    6.870237] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    6.880857] pwm-backlight backlight: Linked as a consumer to regulator.0
[    6.888541] pwm-backlight backlight: Dropping the link to regulator.0
[    6.917594] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    6.926802] pwm-backlight backlight: Linked as a consumer to regulator.0
[    6.934109] pwm-backlight backlight: Dropping the link to regulator.0
[    6.994053] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    7.003249] pwm-backlight backlight: Linked as a consumer to regulator.0
[    7.010398] pwm-backlight backlight: Dropping the link to regulator.0
[    7.120567] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    7.142695] pwm-backlight backlight: Linked as a consumer to regulator.0
[    7.142914] pwm-backlight backlight: Dropping the link to regulator.0
[    7.488049] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    7.497051] pwm-backlight backlight: Linked as a consumer to regulator.0
[    7.504288] pwm-backlight backlight: Dropping the link to regulator.0
[   33.311153] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[   33.320514] pwm-backlight backlight: Linked as a consumer to regulator.0
[   33.334458] pwm-backlight backlight: Dropping the link to regulator.0
[   33.779150] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[   33.789005] pwm-backlight backlight: Linked as a consumer to regulator.0
[   33.796810] pwm-backlight backlight: Dropping the link to regulator.0
root at letux:~# ls -l /sys/class/backlight/
total 0
lrwxrwxrwx 1 root root 0 Jan 17 11:04 keyboard-backlight -> ../../devices/platform/keyboard-backlight/backlight/keyboard-backlight
root at letux:~# lsmod | fgrep pwm
pwm_omap_dmtimer       16384  1 
pwm_bl                 16384  0 
root at letux:~#