Am 19.03.2019 um 16:18 schrieb H. Nikolaus Schaller hns@goldelico.com:
Am 18.03.2019 um 21:04 schrieb H. Nikolaus Schaller hns@goldelico.com:
- BBB+LCDC: display ok, backlight is always on (but does not respond to "xset dpms")
This seems to have a threefold reason:
- there is no DT node for connecting the backlight to the panel driver
- the CONFIG_PWM_TIEHRPWM driver is not configured
- after proerly configuring, pwmss_probe() or ehrpwm_pwm_probe() is never called...
and the pwm_bl finally fails with EPROBE_DEFER and no /sys/class/backlight is registered.
Ah, I found it. Seems to be
https://elixir.bootlin.com/linux/v5.1-rc1/source/arch/arm/boot/dts/am33xx-l4...
status = "disabled";
for the epwmss@0 parent node. Therefore it does not probe it and look for the ehrpwm1 child node (which I already have enabled in the specific DTS).
So now I can focus on experimenting with the SGX drivers and user space on this device...
BR, Nikolaus
The result is that the PWM driver does not run and therefore no backlight pwm driver.
I now wonder if it ever did work... Probably not...
BR, Nikolaus
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