* pwm_bl add framebuffer from fbcon
@ 2018-11-20 10:32 Christian N
2018-11-20 10:32 ` Christian N
0 siblings, 1 reply; 2+ messages in thread
From: Christian N @ 2018-11-20 10:32 UTC (permalink / raw)
To: kernelnewbies
Hi All
First at all I introduce my usecase
-My board based on ARM (OMPA4) can get a custom splash screen on booting
using fbcon.
-By Device Tree I can configure screen backlight with desired level.
i'm trying to turn on backlight when splash screen is displayed and not
before to avoid "white flashes".
I read
Documentation/devicetree/bindings/pwm/pwm.txt
Documentation/devicetree/bindings/leds/pwm-backlight.txt
Documentation/fb/...
https://www.kernel.org/doc/html/v4.14/admin-guide/kernel-parameters.html
Also I noticed that pwm_bl has pwm_backlight_check_fb operation, but I
didnt find a clear way to relate frame buffer used by fbcon with pwm_bl
related functions or how to customize by DT or kernel config which frame
buffer should be used by pwm_bl to turn on when valid data is ready in fb
Any hints will be apreciated.
Regards
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2018-11-20 10:32 pwm_bl add framebuffer from fbcon Christian N
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